ColorTransferFunction

Introduction

vtkColorTransferFunction is a color mapping in RGB or HSV space that
uses piecewise hermite functions to allow interpolation that can be
piecewise constant, piecewise linear, or somewhere in-between
(a modified piecewise hermite function that squishes the function
according to a sharpness parameter). The function also allows for
the specification of the midpoint (the place where the function
reaches the average of the two bounding nodes) as a normalize distance
between nodes.
See the description of class vtkPiecewiseFunction for an explanation of
midpoint and sharpness.

Usage

// create color transfer function
const ctfun = vtkColorTransferFunction.newInstance();
ctfun.addRGBPoint(200.0, 1.0, 1.0, 1.0);
ctfun.addRGBPoint(2000.0, 0.0, 0.0, 0.0);

Methods

addHSVPoint

Add a point defined in HSV

Argument	Type	Required	Description
x	Number	Yes	The index of the point.
h	Number	Yes	Defines the hue of the color (between 0 and 1).
s	Number	Yes	Defines the saturation of the color (between 0 and 1).
v	Number	Yes	Defines the value of the color (between 0 and 1).

addHSVPointLong

Add a point defined in HSV

Argument	Type	Required	Description
x	Number	Yes	The index of the point.
h	Number	Yes	Defines the hue of the color (between 0 and 1).
s	Number	Yes	Defines the saturation of the color (between 0 and 1).
v	Number	Yes	Defines the value of the color (between 0 and 1).
midpoint	Number	No
sharpness	Number	No

addHSVSegment

Add a line defined in HSV

Argument	Type	Required	Description
x1	Number	Yes	The index of the first point.
h1	Number	Yes	Defines the hue of the color of the first point (between 0 and 1).
s1	Number	Yes	Defines the saturation of the color of the first point (between 0 and 1).
v1	Number	Yes	Defines the value of the color of the first point (between 0 and 1).
x2	Number	Yes	The index of the second point.
h2	Number	Yes	Defines the hue of the colorof the second point (between 0 and 1).
s2	Number	Yes	Defines the saturation of the color of the second point (between 0 and 1).
v2	Number	Yes	Defines the value of the color of the second point (between 0 and 1).

addRGBPoint

Add a point defined in RGB

Argument	Type	Required	Description
x	Number	Yes	The index of the point.
r	Number	Yes	Defines the red component (between 0 and 1).
g	Number	Yes	Defines the green component (between 0 and 1).
b	Number	Yes	Defines the blue component (between 0 and 1).

addRGBPointLong

Add a point defined in RGB

Argument	Type	Required	Description
x	Number	Yes	The index of the point.
r	Number	Yes	Defines the red component (between 0 and 1).
g	Number	Yes	Defines the green component (between 0 and 1).
b	Number	Yes	Defines the blue component (between 0 and 1).
midpoint	Number	No
sharpness	Number	No

addRGBSegment

Add a line defined in RGB

Argument	Type	Required	Description
x1	Number	Yes	The index of the first point.
r1	Number	Yes	Defines the red component of the first point(between 0 and 1).
g1	Number	Yes	Defines the green component of the first point(between 0 and 1).
b1	Number	Yes	Defines the red component of the first point (between 0 and 1).
x2	Number	Yes	The index of the second point.
r2	Number	Yes	Defines the red component of the second point (between 0 and 1).
g2	Number	Yes	Defines the green component of the second point (between 0 and 1).
b2	Number	Yes	Defines the blue component of the second point (between 0 and 1).

adjustRange

Remove all points out of the new range, and make sure there is a point at
each end of that range.

Argument	Type	Required	Description
range	Array.	Yes

applyColorMap

Argument	Type	Required	Description
colorMap		Yes

buildFunctionFromArray

Construct a color transfer function from a vtkDataArray.
The order of values depends on the number of components
of the array.
3 -> RGB
4 -> XRGB
5 -> RGBMS
6 -> XRGBMS

X represents the input value to a function
RGB represents the red, green, and blue value output
M represents the midpoint
S represents sharpness

Argument	Type	Required	Description
array	vtkDataArray	Yes

buildFunctionFromTable

Construct a color transfer function from a table.

Argument	Type	Required	Description
xStart	Number	Yes	The index of the first point.
xEnd	Number	Yes	The index of the first point.
size	Number	Yes
table	Array.	Yes

estimateMinNumberOfSamples

Estimates the minimum size of a table such that it would correctly sample this function.

Argument	Type	Required	Description
x1	Number	Yes
x2	Number	Yes

extend

Method use to decorate a given object (publicAPI+model) with vtkColorTransferFunction characteristics.

Argument	Type	Required	Description
publicAPI		Yes	object on which methods will be bounds (public)
model		Yes	object on which data structure will be bounds (protected)
initialValues	object	No	(default: {})

fillFromDataPointer

Defines the nodes from an array ptr with the layout [X1, R1, G1, B1, X2,
R2, G2, B2, …, Xn, Rn, Gn, Bn] where n is the number of nodes.

Argument	Type	Required	Description
nb	Number	Yes
ptr		Yes

findMinimumXDistance

Traverses the nodes to find the minimum distance.

getBlueValue

Get the blue color evaluated at the specified location

Argument	Type	Required	Description
x	Number	Yes	The index of the point.

getColor

Get the RGB color evaluated at the specified location

Argument	Type	Required	Description
x	Number	Yes	The index of the point.
rgb	Array.	Yes	The Array of the RGB color to fill.

getGreenValue

Get the green color evaluated at the specified location

Argument	Type	Required	Description
x	Number	Yes	The index of the point.

getIndexedColor

Get the color given an integer index.

Argument	Type	Required	Description
idx	Number	Yes	The index of the point.
rgba	Array.	Yes	An Array of the RGBA color.

getNodeValue

For the node specified by index, set/get the location (X), R, G, and B
values, midpoint, and sharpness values at the node.

Argument	Type	Required	Description
index	Number	Yes
val	Array.	Yes

getNumberOfAvailableColors

Get the number of available colors for mapping to.

getRedValue

Get the red color evaluated at the specified location

Argument	Type	Required	Description
x	Number	Yes	The index of the point.

getSize

Get the number of points which specify this function

getTable

Get a table of RGB colors at regular intervals along the function

Argument	Type	Required	Description
xStart	Number	Yes	The index of the first point.
xEnd	Number	Yes	The index of the second point.
size	Number	Yes
table	Array.	Yes

getUint8Table

Argument	Type	Required	Description
xStart	Number	Yes	The index of the first point.
xEnd	Number	Yes	The index of the first point.
size	Number	Yes
withAlpha	Boolean	Yes

mapData

Map a set of scalars through the lookup table.

Argument	Type	Required	Description
input		Yes
output		Yes
outFormat		Yes
inputOffset		Yes

mapScalarsThroughTable

Argument	Type	Required	Description
input		Yes
output		Yes
outFormat		Yes
inputOffset		Yes

mapValue

Get the RGBA color evaluated at the specified location

Argument	Type	Required	Description
x	Number	Yes	The index of the point.

movePoint

Moves point from oldX to newX.

It removed the point from oldX. If any point existed at newX, it will also be removed.

Argument	Type	Required	Description
oldX	Number	Yes	The old index of the point.
newX	Number	Yes	The new index of the point.

newInstance

Method use to create a new instance of vtkColorTransferFunction

Argument	Type	Required	Description
initialValues	object	No	for pre-setting some of its content

removeAllPoints

Remove all points

removePoint

Remove a point

Argument	Type	Required	Description
x	Number	Yes	The index of the point.

setNodeValue

For a specified index value, set the node parameters

Argument	Type	Required	Description
index	Number	Yes
val	Array.	Yes

setNodes

Set nodes directly

Argument	Type	Required	Description
nodes		Yes

Returns

Type	Description
	true if a change happen

sortAndUpdateRange

Sort the vector in increasing order, then fill in
the Range

Returns

Type	Description
	true if a change happen

updateRange

Returns

Type	Description
	true if a change happen

Source

ColorMaps.d.ts

/**
 * vtkColorMaps represents a global registry of preset color maps.
 */

import { Vector3 } from '../../../types';

export interface IColorMapPreset {
  Name: string;
  Creator?: string;
  ColorSpace?: string;
  NanColor?: Vector3;
  RGBPoints: number[];
  IndexedColors?: number[];
  Annotations?: (number | string)[];
}

export declare const vtkColorMaps: {
  addPreset(preset: IColorMapPreset): void;
  removePresetByName(name: string): void;
  getPresetByName(name: string): IColorMapPreset;
  rgbPresetNames: string[];
};

export default vtkColorMaps;

ColorMaps.js

import vtkColorMaps from 'vtk.js/Sources/Rendering/Core/ColorTransferFunction/ColorMaps.json';

const presetMap = Object.create(null);

vtkColorMaps
  .filter((p) => p.RGBPoints)
  .filter((p) => p.ColorSpace !== 'CIELAB')
  .forEach((p) => {
    presetMap[p.Name] = p;
  });

// ----------------------------------------------------------------------------

const rgbPresetNames = Object.keys(presetMap);
rgbPresetNames.sort();

// ----------------------------------------------------------------------------

function getPresetByName(name) {
  return presetMap[name];
}

// ----------------------------------------------------------------------------

function addPreset(preset) {
  if (!preset.RGBPoints || preset.ColorSpace === 'CIELAB') {
    return;
  }

  if (!presetMap[preset.Name]) {
    rgbPresetNames.push(preset.Name);
    rgbPresetNames.sort();
  }

  presetMap[preset.Name] = preset;
}

// ----------------------------------------------------------------------------

function removePresetByName(name) {
  const index = rgbPresetNames.indexOf(name);
  if (index > -1) {
    rgbPresetNames.splice(index, 1);
  }
  delete presetMap[name];
}

// ----------------------------------------------------------------------------

export default {
  addPreset,
  removePresetByName,
  getPresetByName,
  rgbPresetNames,
};

ColorMaps.json

[
   {
      "Name" : "KAAMS",
      "IndexedColors" : [
         1.00,
         1.00,
         1.00,
         1.00,
         0.00,
         0.00,
         0.00,
         1.00,
         0.00,
         0.00,
         0.00,
         1.00,
         1.00,
         1.00,
         0.00,
         1.00,
         0.00,
         1.00,
         0.00,
         1.00,
         1.00,
         0.63,
         0.63,
         1.00,
         0.67,
         0.50,
         0.33,
         1.00,
         0.50,
         0.75,
         0.53,
         0.35,
         0.70,
         1.00,
         0.75,
         0.50
      ],
      "Annotations" :[
         0, 0,
         1, 1,
         2, 2,
         3, 3,
         4, 4,
         5, 5,
         6, 6,
         7, 7,
         8, 8,
         9, 9,
         10, 10,
         11, 11
      ]
   },
   {
      "ColorSpace" : "Diverging",
      "Name" : "Cool to Warm",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.23137254902,
         0.298039215686,
         0.752941176471,
         0.5,
         0.865,
         0.865,
         0.865,
         1,
         0.705882352941,
         0.0156862745098,
         0.149019607843
      ]
   },
   {
      "ColorSpace" : "Lab",
      "Creator" : "Francesca Samsel",
      "Name" : "Cool to Warm (Extended)",
      "NanColor" : [ 0.25, 0, 0 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0.34902,
         0.03125,
         0.039216,
         0.062745,
         0.380392,
         0.0625,
         0.062745,
         0.117647,
         0.411765,
         0.09375,
         0.090196,
         0.184314,
         0.45098,
         0.125,
         0.12549,
         0.262745,
         0.501961,
         0.15625,
         0.160784,
         0.337255,
         0.541176,
         0.1875,
         0.2,
         0.396078,
         0.568627,
         0.21875,
         0.239216,
         0.454902,
         0.6,
         0.25,
         0.286275,
         0.5215689999999999,
         0.65098,
         0.28125,
         0.337255,
         0.592157,
         0.7019609999999999,
         0.3125,
         0.388235,
         0.654902,
         0.74902,
         0.34375,
         0.466667,
         0.737255,
         0.819608,
         0.375,
         0.572549,
         0.819608,
         0.878431,
         0.40625,
         0.654902,
         0.866667,
         0.9098039999999999,
         0.4375,
         0.752941,
         0.917647,
         0.941176,
         0.46875,
         0.823529,
         0.956863,
         0.968627,
         0.5,
         0.988235,
         0.960784,
         0.901961,
         0.5,
         0.941176,
         0.984314,
         0.988235,
         0.52,
         0.988235,
         0.945098,
         0.85098,
         0.54,
         0.980392,
         0.898039,
         0.784314,
         0.5625,
         0.968627,
         0.835294,
         0.698039,
         0.59375,
         0.94902,
         0.733333,
         0.588235,
         0.625,
         0.929412,
         0.65098,
         0.509804,
         0.65625,
         0.9098039999999999,
         0.564706,
         0.435294,
         0.6875,
         0.878431,
         0.458824,
         0.352941,
         0.71875,
         0.839216,
         0.388235,
         0.286275,
         0.75,
         0.760784,
         0.294118,
         0.211765,
         0.78125,
         0.7019609999999999,
         0.211765,
         0.168627,
         0.8125,
         0.65098,
         0.156863,
         0.129412,
         0.84375,
         0.6,
         0.09411799999999999,
         0.09411799999999999,
         0.875,
         0.54902,
         0.066667,
         0.098039,
         0.90625,
         0.501961,
         0.05098,
         0.12549,
         0.9375,
         0.45098,
         0.054902,
         0.172549,
         0.96875,
         0.4,
         0.054902,
         0.192157,
         1,
         0.34902,
         0.070588,
         0.211765
      ]
   },
   {
      "ColorSpace" : "Diverging",
      "Name" : "Warm to Cool",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.705882352941,
         0.0156862745098,
         0.149019607843,
         0.5,
         0.865,
         0.865,
         0.865,
         1,
         0.23137254902,
         0.298039215686,
         0.752941176471
      ]
   },
   {
      "ColorSpace" : "Lab",
      "Creator" : "Francesca Samsel",
      "Name" : "Warm to Cool (Extended)",
      "NanColor" : [ 0.250004, 0, 0 ],
      "RGBPoints" : [
         0,
         0.34902,
         0,
         0.129412,
         0.025,
         0.4,
         0.00392157,
         0.101961,
         0.05,
         0.470588,
         0.0156863,
         0.0901961,
         0.075,
         0.54902,
         0.027451,
         0.0705882,
         0.1,
         0.619608,
         0.0627451,
         0.0431373,
         0.125,
         0.690196,
         0.12549,
         0.0627451,
         0.15,
         0.7411759999999999,
         0.184314,
         0.0745098,
         0.175,
         0.788235,
         0.266667,
         0.0941176,
         0.2,
         0.811765,
         0.345098,
         0.113725,
         0.225,
         0.831373,
         0.411765,
         0.133333,
         0.25,
         0.85098,
         0.47451,
         0.145098,
         0.275,
         0.870588,
         0.54902,
         0.156863,
         0.3,
         0.878431,
         0.619608,
         0.168627,
         0.325,
         0.890196,
         0.658824,
         0.196078,
         0.35,
         0.9098039999999999,
         0.717647,
         0.235294,
         0.375,
         0.929412,
         0.776471,
         0.278431,
         0.395522,
         0.94902,
         0.823529,
         0.321569,
         0.418905,
         0.968627,
         0.87451,
         0.407843,
         0.444278,
         0.980392,
         0.917647,
         0.509804,
         0.470149,
         0.988235,
         0.956863,
         0.643137,
         0.483582,
         0.992157,
         0.964706,
         0.7137250000000001,
         0.499,
         0.988235,
         0.980392,
         0.870588,
         0.5,
         1,
         1,
         1,
         0.501,
         0.913725,
         0.988235,
         0.9372549999999999,
         0.516418,
         0.827451,
         0.980392,
         0.886275,
         0.531343,
         0.764706,
         0.980392,
         0.866667,
         0.546766,
         0.658824,
         0.980392,
         0.843137,
         0.564179,
         0.572549,
         0.964706,
         0.835294,
         0.587562,
         0.423529,
         0.941176,
         0.87451,
         0.60597,
         0.262745,
         0.901961,
         0.862745,
         0.629851,
         0.0705882,
         0.8549020000000001,
         0.870588,
         0.651741,
         0.0509804,
         0.8,
         0.85098,
         0.681592,
         0.0235294,
         0.709804,
         0.831373,
         0.712935,
         0.0313725,
         0.615686,
         0.811765,
         0.75,
         0.0313725,
         0.537255,
         0.788235,
         0.775,
         0.0392157,
         0.466667,
         0.7686269999999999,
         0.8,
         0.0509804,
         0.396078,
         0.7411759999999999,
         0.825,
         0.054902,
         0.317647,
         0.709804,
         0.85,
         0.054902,
         0.243137,
         0.678431,
         0.875,
         0.0431373,
         0.164706,
         0.639216,
         0.9,
         0.0313725,
         0.09803920000000001,
         0.6,
         0.925,
         0.0392157,
         0.0392157,
         0.5607839999999999,
         0.95,
         0.105882,
         0.0509804,
         0.509804,
         0.975,
         0.113725,
         0.0235294,
         0.45098,
         1,
         0.12549,
         0,
         0.380392
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Rainbow Desaturated",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.278431372549,
         0.278431372549,
         0.858823529412,
         0.143,
         0,
         0,
         0.360784313725,
         0.285,
         0,
         1,
         1,
         0.429,
         0,
         0.501960784314,
         0,
         0.571,
         1,
         1,
         0,
         0.714,
         1,
         0.380392156863,
         0,
         0.857,
         0.419607843137,
         0,
         0,
         1,
         0.8784313725489999,
         0.301960784314,
         0.301960784314
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Cold and Hot",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         1,
         1,
         0.45,
         0,
         0,
         1,
         0.5,
         0,
         0,
         0.501960784314,
         0.55,
         1,
         0,
         0,
         1,
         1,
         1,
         0
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black-Body Radiation",
      "NanColor" : [ 0, 0.498039215686, 1 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.4,
         0.901960784314,
         0,
         0,
         0.8,
         0.901960784314,
         0.901960784314,
         0,
         1,
         1,
         1,
         1
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "X Ray",
      "NanColor" : [ 1, 0, 0 ],
      "RGBPoints" : [ 0, 1, 1, 1, 1, 0, 0, 0 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Grayscale",
      "NanColor" : [ 1, 0, 0 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 1, 1, 1 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "BkRd",
      "NanColor" : [ 0, 1, 1 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 1, 0, 0 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "BkGn",
      "NanColor" : [ 1, 0, 1 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 0, 1, 0 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "BkBu",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 0, 0, 1 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "BkMa",
      "NanColor" : [ 0, 1, 0 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 1, 0, 1 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "BkCy",
      "NanColor" : [ 0, 1, 1 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 0, 1, 1 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black, Blue and White",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.333,
         0,
         0,
         0.501960784314,
         0.666,
         0,
         0.501960784314,
         1,
         1,
         1,
         1,
         1
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black, Orange and White",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.333,
         0.501960784314,
         0,
         0,
         0.666,
         1,
         0.501960784314,
         0,
         1,
         1,
         1,
         1
      ]
   },
   {
      "ColorSpace" : "Lab",
      "Creator" : "Francesca Samsel",
      "Name" : "Linear YGB 1211g",
      "NanColor" : [ 0.25, 0, 0 ],
      "RGBPoints" : [
         0,
         1,
         0.988235,
         0.968627,
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           0.26, 0.00, 0.40,
           0.00, 0.49, 0.00,
           0.44, 0.67, 0.98,
           0.00, 0.73, 1.00,
           0.00, 0.63, 1.00,
           0.00, 0.56, 1.00,
           0.00, 0.50, 1.00,
           0.00, 0.42, 1.00,
           0.33, 0.36, 0.95,
           0.47, 0.36, 0.89,
           0.54, 0.31, 0.89,
           0.63, 0.21, 0.83,
           0.70, 0.12, 0.83,
           0.70, 0.12, 0.73,
           0.70, 0.05, 0.65,
           0.74, 0.05, 0.53,
           0.78, 0.00, 0.40,
           0.80, 0.00, 0.35,
           0.82, 0.00, 0.31,
           0.85, 0.00, 0.27,
           0.88, 0.00, 0.22,
           0.90, 0.00, 0.18,
           0.91, 0.00, 0.15,
           0.92, 0.00, 0.14,
           0.93, 0.00, 0.13,
           0.94, 0.00, 0.12,
           0.95, 0.00, 0.11,
           0.96, 0.00, 0.10,
           0.97, 0.00, 0.09,
           0.98, 0.00, 0.08,
           0.99, 0.00, 0.07,
           1.00, 0.00, 0.06
       ],
       "Annotations" : [
           0, "Xx",
           1, "H",
           2, "He",
           3, "Li",
           4, "Be",
           5, "B",
           6, "C",
           7, "N",
           8, "O",
           9, "F",
           10, "Ne",
           11, "Na",
           12, "Mg",
           13, "Al",
           14, "Si",
           15, "P",
           16, "S",
           17, "Cl",
           18, "Ar",
           19, "K",
           20, "Ca",
           21, "Sc",
           22, "Ti",
           23, "V",
           24, "Cr",
           25, "Mn",
           26, "Fe",
           27, "Co",
           28, "Ni",
           29, "Cu",
           30, "Zn",
           31, "Ga",
           32, "Ge",
           33, "As",
           34, "Se",
           35, "Br",
           36, "Kr",
           37, "Rb",
           38, "Sr",
           39, "Y",
           40, "Zr",
           41, "Nb",
           42, "Mo",
           43, "Tc",
           44, "Ru",
           45, "Rh",
           46, "Pd",
           47, "Ag",
           48, "Cd",
           49, "In",
           50, "Sn",
           51, "Sb",
           52, "Te",
           53, "I",
           54, "Xe",
           55, "Cs",
           56, "Ba",
           57, "La",
           58, "Ce",
           59, "Pr",
           60, "Nd",
           61, "Pm",
           62, "Sm",
           63, "Eu",
           64, "Gd",
           65, "Tb",
           66, "Dy",
           67, "Ho",
           68, "Er",
           69, "Tm",
           70, "Yb",
           71, "Lu",
           72, "Hf",
           73, "Ta",
           74, "W",
           75, "Re",
           76, "Os",
           77, "Ir",
           78, "Pt",
           79, "Au",
           80, "Hg",
           81, "Tl",
           82, "Pb",
           83, "Bi",
           84, "Po",
           85, "At",
           86, "Rn",
           87, "Fr",
           88, "Ra",
           89, "Ac",
           90, "Th",
           91, "Pa",
           92, "U",
           93, "Np",
           94, "Pu",
           95, "Am",
           96, "Cm",
           97, "Bk",
           98, "Cf",
           99, "Es",
           100, "Fm",
           101, "Md",
           102, "No",
           103, "Lr",
           104, "Rf",
           105, "Db",
           106, "Sg",
           107, "Bh",
           108, "Hs",
           109, "Mt",
           110, "Ds",
           111, "Rg",
           112, "Cn",
           113, "Uut",
           114, "Uuq",
           115, "Uup",
           116, "Uuh",
           117, "Uus",
           118, "Uuo"
       ],
       "Name" : "BlueObeliskElements"
    }
]

ColorMapsLite.js

import vtkColorMaps from 'vtk.js/Sources/Rendering/Core/ColorTransferFunction/LiteColorMaps.json';

const presetMap = Object.create(null);

vtkColorMaps
  .filter((p) => p.RGBPoints)
  .filter((p) => p.ColorSpace !== 'CIELAB')
  .forEach((p) => {
    presetMap[p.Name] = p;
  });

// ----------------------------------------------------------------------------

const rgbPresetNames = Object.keys(presetMap);
rgbPresetNames.sort();

// ----------------------------------------------------------------------------

function getPresetByName(name) {
  return presetMap[name];
}

// ----------------------------------------------------------------------------

function addPreset(preset) {
  if (!preset.RGBPoints || preset.ColorSpace === 'CIELAB') {
    return;
  }

  if (!presetMap[preset.Name]) {
    rgbPresetNames.push(preset.Name);
    rgbPresetNames.sort();
  }

  presetMap[preset.Name] = preset;
}

// ----------------------------------------------------------------------------

function removePresetByName(name) {
  const index = rgbPresetNames.indexOf(name);
  if (index > -1) {
    rgbPresetNames.splice(index, 1);
  }
  delete presetMap[name];
}

// ----------------------------------------------------------------------------

export default {
  addPreset,
  removePresetByName,
  getPresetByName,
  rgbPresetNames,
};

Constants.d.ts

export declare enum ColorSpace {
  RGB = 0,
  HSV = 1,
  LAB = 2,
  DIVERGING = 3,
}

export declare enum Scale {
  LINEAR = 0,
  LOG10 = 1,
}

declare const _default: {
  ColorSpace: typeof ColorSpace;
  Scale: typeof Scale;
};
export default _default;

Constants.js

export const ColorSpace = {
  RGB: 0,
  HSV: 1,
  LAB: 2,
  DIVERGING: 3,
};

export const Scale = {
  LINEAR: 0,
  LOG10: 1,
};

export default {
  ColorSpace,
  Scale,
};

CssFilters.d.ts

/**
 * A helper file to transform RGBA points using CSS filters equivalent
 * The equivalents of CSS filters using SVG filters can be found here:
 * https://www.w3.org/TR/filter-effects-1/#ShorthandEquivalents
 * For each SVG filter, you can look for the maths behind it on the same page:
 * https://www.w3.org/TR/filter-effects-1/#FilterPrimitivesOverview
 *
 * For example, the saturate filter equivalent is here:
 * https://www.w3.org/TR/filter-effects-1/#saturateEquivalent
 * And the maths behind the feColorMatrix of type saturate is here:
 * https://www.w3.org/TR/filter-effects-1/#ref-for-attr-valuedef-type-saturate
 *
 * The transforms are done using matrices of size 5 by 5. They are row major
 * as in vtkMath. The vectors representing the RGBA points uses
 * [R, G, B, A, 1] vectors, with each channel between 0 and 1.
 */

import { Matrix, Vector3 } from '../../../types';

export const luminanceWeights: Vector3;
export type FilterMatrix = Matrix;

/**
 * Create a new filter matrix
 * This is a 5x5 row major array
 * Use applyFilter() function to use it
 * It is NOT the identity
 */
export function createCSSFilter(): FilterMatrix;

/**
 * Convert a filter to an identity matrix or create a new identity filter
 * @param outFilter If specified, the outFilter is converted to identity filter
 */
export function createIdentityFilter(outFilter?: FilterMatrix): FilterMatrix;

/**
 * Combine two filters into a single filter
 * Warning: it is NOT an operation inspired by CSS filters
 * For this, apply filters one by one using applyFilter
 * The clamping step is not applied between each filter when the filters are combined
 * The order of the filters matters
 * @param baseFilter The first filter that will be applied
 * @param newFilter The second filter that will be applied
 * @param outFilter An optional filter that will contain the combined filter
 */
export function combineFilters(
  baseFilter: FilterMatrix,
  newFilter: FilterMatrix,
  outFilter?: FilterMatrix
): FilterMatrix;

/**
 * Apply a filter to a rgb(a) point
 * It is a multiplication by the matrix and a clamping
 * @param filter The filter
 * @param r The red channel (between 0 and 1)
 * @param g The green channel (between 0 and 1)
 * @param b The blue channel (between 0 and 1)
 * @param a The optional alpha channel (between 0 and 1), defaults to 1
 * @returns A vector of size 4 [r, g, b, a]
 */
export function applyFilter(
  filter: FilterMatrix,
  r: number,
  g: number,
  b: number,
  a?: number
): [number, number, number, number];

/**
 * A generic linear filter
 * See svg equivalent for parameters and a specification
 * https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-linear
 * @param slope
 * @param intercept
 * @param outFilter Optional output, a new filter is created if not specified
 */
export function createLinearFilter(
  slope: number,
  intercept: number,
  outFilter?: FilterMatrix
): FilterMatrix;

/**
 * A contrast filter
 * See css/svg equivalent for parameters and a specification
 * https://www.w3.org/TR/filter-effects-1/#contrastEquivalent
 * https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-linear
 * @param contrast
 * @param outFilter Optional output, a new filter is created if not specified
 */
export function createContrastFilter(
  contrast: number,
  outFilter?: FilterMatrix
): FilterMatrix;

/**
 * A saturate filter
 * See css/svg equivalent for parameters and a specification
 * https://www.w3.org/TR/filter-effects-1/#saturateEquivalent
 * https://www.w3.org/TR/filter-effects-1/#ref-for-attr-valuedef-type-saturate
 * @param saturate
 * @param outFilter Optional output, a new filter is created if not specified
 */
export function createSaturateFilter(
  saturate: number,
  outFilter?: FilterMatrix
): FilterMatrix;

/**
 * A brightness filter
 * See css/svg equivalent for parameters and a specification
 * https://www.w3.org/TR/filter-effects-1/#brightnessEquivalent
 * https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-linear
 * @param brightness
 * @param outFilter Optional output, a new filter is created if not specified
 */
export function createBrightnessFilter(
  brightness: number,
  outFilter?: FilterMatrix
): FilterMatrix;

/**
 * An invert filter
 * See css/svg equivalent for parameters and a specification
 * https://www.w3.org/TR/filter-effects-1/#invertEquivalent
 * https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-table
 * @param invert
 * @param outFilter Optional output, a new filter is created if not specified
 */
export function createInvertFilter(
  invert: number,
  outFilter?: FilterMatrix
): FilterMatrix;

CssFilters.js

/**
 * A helper file to transform RGBA points using CSS filters equivalent
 * The equivalents of CSS filters using SVG filters can be found here:
 * https://www.w3.org/TR/filter-effects-1/#ShorthandEquivalents
 * For each SVG filter, you can look for the maths behind it on the same page:
 * https://www.w3.org/TR/filter-effects-1/#FilterPrimitivesOverview
 *
 * For example, the saturate filter equivalent is here:
 * https://www.w3.org/TR/filter-effects-1/#saturateEquivalent
 * And the maths behind the feColorMatrix of type saturate is here:
 * https://www.w3.org/TR/filter-effects-1/#ref-for-attr-valuedef-type-saturate
 *
 * The transforms are done using matrices of size 5 by 5. They are row major
 * as in vtkMath. The vectors representing the RGBA points uses
 * [R, G, B, A, 1] vectors, with each channel between 0 and 1.
 */

import { identity, multiplyMatrix } from 'vtk.js/Sources/Common/Core/Math';

export const luminanceWeights = [0.213, 0.715, 0.072];

export function createCSSFilter() {
  return new Array(25);
}

export function createIdentityFilter(outFilter = createCSSFilter()) {
  return identity(5, outFilter);
}

export function combineFilters(
  baseFilter,
  newFilter,
  outFilter = createCSSFilter()
) {
  multiplyMatrix(newFilter, baseFilter, 5, 5, 5, 5, outFilter);
  return outFilter;
}

export function applyFilter(filter, r, g, b, a = 1) {
  const vec = [r, g, b, a, 1];
  multiplyMatrix(filter, vec, 5, 5, 5, 1, vec);
  // Clamp R, G, B, A
  const output = new Array(4);
  for (let i = 0; i < 4; ++i) {
    const value = vec[i];
    if (value < 0) {
      output[i] = 0;
    } else if (value > 1) {
      output[i] = 1;
    } else {
      output[i] = value;
    }
  }
  return output;
}

export function createLinearFilter(
  slope,
  intercept,
  outFilter = createCSSFilter()
) {
  createIdentityFilter(outFilter);
  for (let row = 0; row < 3; ++row) {
    outFilter[row * 5 + row] = slope;
    outFilter[row * 5 + 4] = intercept;
  }
  return outFilter;
}

// https://www.w3.org/TR/filter-effects-1/#contrastEquivalent
// https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-linear
export function createContrastFilter(contrast, outFilter = createCSSFilter()) {
  const slope = contrast;
  const intercept = -(0.5 * contrast) + 0.5;
  return createLinearFilter(slope, intercept, outFilter);
}

// https://www.w3.org/TR/filter-effects-1/#saturateEquivalent
// https://www.w3.org/TR/filter-effects-1/#ref-for-attr-valuedef-type-saturate
export function createSaturateFilter(saturate, outFilter = createCSSFilter()) {
  createIdentityFilter(outFilter);
  for (let col = 0; col < 3; ++col) {
    const columnLuminance = luminanceWeights[col];
    const diagonalValue = columnLuminance + (1 - columnLuminance) * saturate;
    const nonDiagonalValue = columnLuminance - columnLuminance * saturate;
    for (let row = 0; row < 3; ++row) {
      outFilter[row * 5 + col] = row === col ? diagonalValue : nonDiagonalValue;
    }
  }
  return outFilter;
}

// https://www.w3.org/TR/filter-effects-1/#brightnessEquivalent
// https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-linear
export function createBrightnessFilter(
  brightness,
  outFilter = createCSSFilter()
) {
  const slope = brightness;
  const intercept = 0;
  return createLinearFilter(slope, intercept, outFilter);
}

// https://www.w3.org/TR/filter-effects-1/#invertEquivalent
// https://www.w3.org/TR/filter-effects-1/#attr-valuedef-type-table
export function createInvertFilter(invert, outFilter = createCSSFilter()) {
  const slope = 1 - 2 * invert;
  const intercept = invert;
  return createLinearFilter(slope, intercept, outFilter);
}

LiteColorMaps.json

[
  {
      "ColorSpace" : "Diverging",
      "Name" : "Cool to Warm",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.23137254902,
         0.298039215686,
         0.752941176471,
         0.5,
         0.865,
         0.865,
         0.865,
         1,
         0.705882352941,
         0.0156862745098,
         0.149019607843
      ]
  },{
      "ColorSpace" : "Diverging",
      "Name" : "Warm to Cool",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.705882352941,
         0.0156862745098,
         0.149019607843,
         0.5,
         0.865,
         0.865,
         0.865,
         1,
         0.23137254902,
         0.298039215686,
         0.752941176471
      ]
   },{
      "ColorSpace" : "RGB",
      "Name" : "Rainbow Desaturated",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0.278431372549,
         0.278431372549,
         0.858823529412,
         0.143,
         0,
         0,
         0.360784313725,
         0.285,
         0,
         1,
         1,
         0.429,
         0,
         0.501960784314,
         0,
         0.571,
         1,
         1,
         0,
         0.714,
         1,
         0.380392156863,
         0,
         0.857,
         0.419607843137,
         0,
         0,
         1,
         0.8784313725489999,
         0.301960784314,
         0.301960784314
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Cold and Hot",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         1,
         1,
         0.45,
         0,
         0,
         1,
         0.5,
         0,
         0,
         0.501960784314,
         0.55,
         1,
         0,
         0,
         1,
         1,
         1,
         0
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black-Body Radiation",
      "NanColor" : [ 0, 0.498039215686, 1 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.4,
         0.901960784314,
         0,
         0,
         0.8,
         0.901960784314,
         0.901960784314,
         0,
         1,
         1,
         1,
         1
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "X Ray",
      "NanColor" : [ 1, 0, 0 ],
      "RGBPoints" : [ 0, 1, 1, 1, 1, 0, 0, 0 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Grayscale",
      "NanColor" : [ 1, 0, 0 ],
      "RGBPoints" : [ 0, 0, 0, 0, 1, 1, 1, 1 ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black, Blue and White",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.333,
         0,
         0,
         0.501960784314,
         0.666,
         0,
         0.501960784314,
         1,
         1,
         1,
         1,
         1
      ]
   },
   {
      "ColorSpace" : "RGB",
      "Name" : "Black, Orange and White",
      "NanColor" : [ 1, 1, 0 ],
      "RGBPoints" : [
         0,
         0,
         0,
         0,
         0.333,
         0.501960784314,
         0,
         0,
         0.666,
         1,
         0.501960784314,
         0,
         1,
         1,
         1,
         1
      ]
   },{
      "ColorSpace" : "Lab",
      "Name" : "erdc_rainbow_bright",
      "RGBPoints" : [
         -1,
         0.32549,
         0.14902,
         0.960784,
         -0.866221,
         0.297047,
         0.375586,
         0.963836,
         -0.732441,
         0.180302,
         0.536818,
         0.964627,
         -0.598662,
         0.1302,
         0.649207,
         0.929647,
         -0.464883,
         0.0445143,
         0.749654,
         0.855998,
         -0.331104,
         0.0271325,
         0.830713,
         0.721527,
         -0.197324,
         0.259504,
         0.8661450000000001,
         0.543555,
         -0.0635452,
         0.428364,
         0.890725,
         0.329819,
         0.07023409999999999,
         0.568503,
         0.898508,
         0.187623,
         0.204013,
         0.738259,
         0.890317,
         0.0825461,
         0.337793,
         0.84546,
         0.86136,
         0.0147555,
         0.471572,
         0.912191,
         0.808018,
         0,
         0.605351,
         0.962848,
         0.710445,
         0,
         0.73913,
         0.9994690000000001,
         0.600258,
         0.0176284,
         0.87291,
         0.994156,
         0.445975,
         0.193912,
         1,
         0.980407,
         0.247105,
         0.262699
      ]
   },
   {
      "ColorSpace" : "Lab",
      "Name" : "erdc_rainbow_dark",
      "RGBPoints" : [
         -1,
         0,
         0,
         0.423499,
         -0.866221,
         0,
         0.119346,
         0.529237,
         -0.732441,
         0,
         0.238691,
         0.634976,
         -0.598662,
         0,
         0.346852,
         0.68788,
         -0.464883,
         0,
         0.45022,
         0.718141,
         -0.331104,
         0,
         0.553554,
         0.664839,
         -0.197324,
         0,
         0.651082,
         0.519303,
         -0.0635452,
         0.115841,
         0.72479,
         0.352857,
         0.07023409999999999,
         0.326771,
         0.781195,
         0.140187,
         0.204013,
         0.522765,
         0.798524,
         0.0284624,
         0.337793,
         0.703162,
         0.788685,
         0.00885756,
         0.471572,
         0.845118,
         0.7511330000000001,
         0,
         0.605351,
         0.955734,
         0.690825,
         0,
         0.73913,
         0.995402,
         0.567916,
         0.0618524,
         0.87291,
         0.987712,
         0.403398,
         0.164851,
         1,
         0.980407,
         0.247105,
         0.262699
      ]
   }
]

index.d.ts

import vtkDataArray from '../../../Common/Core/DataArray';
import vtkScalarsToColors from '../../../Common/Core/ScalarsToColors';
import { ColorSpace, Scale } from './Constants';

export interface vtkColorTransferFunction extends vtkScalarsToColors {
  /**
   * Add a point defined in RGB
   * @param {Number} x The index of the point.
   * @param {Number} r Defines the red component (between 0 and 1).
   * @param {Number} g Defines the green component (between 0 and 1).
   * @param {Number} b Defines the blue component (between 0 and 1).
   */
  addRGBPoint(x: number, r: number, g: number, b: number): number;

  /**
   * Add a point defined in RGB
   * @param {Number} x The index of the point.
   * @param {Number} r Defines the red component (between 0 and 1).
   * @param {Number} g Defines the green component (between 0 and 1).
   * @param {Number} b Defines the blue component (between 0 and 1).
   * @param {Number} [midpoint]
   * @param {Number} [sharpness]
   */
  addRGBPointLong(
    x: number,
    r: number,
    g: number,
    b: number,
    midpoint?: number,
    sharpness?: number
  ): number;

  /**
   * Add a point defined in HSV
   * @param {Number} x The index of the point.
   * @param {Number} h Defines the hue of the color (between 0 and 1).
   * @param {Number} s Defines the saturation of the color (between 0 and 1).
   * @param {Number} v Defines the value of the color (between 0 and 1).
   */
  addHSVPoint(x: number, h: number, s: number, v: number): number;

  /**
   * Add a line defined in RGB
   * @param {Number} x1 The index of the first point.
   * @param {Number} r1 Defines the red component of the first point(between 0 and 1).
   * @param {Number} g1 Defines the green component of the first point(between 0 and 1).
   * @param {Number} b1 Defines the red component of the first point (between 0 and 1).
   * @param {Number} x2 The index of the second point.
   * @param {Number} r2 Defines the red component of the second point (between 0 and 1).
   * @param {Number} g2 Defines the green component of the second point (between 0 and 1).
   * @param {Number} b2 Defines the blue component of the second point (between 0 and 1).
   */
  addRGBSegment(
    x1: number,
    r1: number,
    g1: number,
    b1: number,
    x2: number,
    r2: number,
    g2: number,
    b2: number
  ): void;

  /**
   * Add a line defined in HSV
   * @param {Number} x1 The index of the first point.
   * @param {Number} h1 Defines the hue of the color of the first point (between 0 and 1).
   * @param {Number} s1 Defines the saturation of the color of the first point (between 0 and 1).
   * @param {Number} v1 Defines the value of the color of the first point (between 0 and 1).
   * @param {Number} x2 The index of the second point.
   * @param {Number} h2 Defines the hue of the colorof the second point (between 0 and 1).
   * @param {Number} s2 Defines the saturation of the color of the second point (between 0 and 1).
   * @param {Number} v2 Defines the value of the color of the second point (between 0 and 1).
   */
  addHSVSegment(
    x1: number,
    h1: number,
    s1: number,
    v1: number,
    x2: number,
    h2: number,
    s2: number,
    v2: number
  ): void;

  /**
   * Add a point defined in HSV
   * @param {Number} x The index of the point.
   * @param {Number} h Defines the hue of the color (between 0 and 1).
   * @param {Number} s Defines the saturation of the color (between 0 and 1).
   * @param {Number} v Defines the value of the color (between 0 and 1).
   * @param {Number} [midpoint]
   * @param {Number} [sharpness]
   */
  addHSVPointLong(
    x: number,
    h: number,
    s: number,
    v: number,
    midpoint?: number,
    sharpness?: number
  ): number;

  /**
   * Get the number of points which specify this function
   */
  getSize(): number;

  /**
   * Set nodes directly
   * @param nodes
   *
   * @returns true if a change happen
   */
  setNodes(nodes: any): boolean;

  /**
   * Sort the vector in increasing order, then fill in
   * the Range
   *
   * @returns true if a change happen
   */
  sortAndUpdateRange(): boolean;

  /**
   * @returns true if a change happen
   */
  updateRange(): boolean;

  /**
   * Remove a point
   * @param {Number} x The index of the point.
   */
  removePoint(x: number): number;

  /**
   * Moves point from oldX to newX.
   *
   * It removed the point from oldX. If any point existed at newX, it will also be removed.
   * @param {Number} oldX The old index of the point.
   * @param {Number} newX The new index of the point.
   */
  movePoint(oldX: number, newX: number): void;

  /**
   * Remove all points
   */
  removeAllPoints(): void;

  /**
   * Get the RGBA color evaluated at the specified location
   * @param {Number} x The index of the point.
   */
  mapValue(x: number): any;

  /**
   * Get the RGB color evaluated at the specified location
   * @param {Number} x The index of the point.
   * @param {Number[]} rgb The Array of the RGB color to fill.
   */
  getColor(x: number, rgb: number[]): void;

  /**
   * Get the red color evaluated at the specified location
   * @param {Number} x The index of the point.
   */
  getRedValue(x: number): number;

  /**
   * Get the green color evaluated at the specified location
   * @param {Number} x The index of the point.
   */
  getGreenValue(x: number): number;

  /**
   * Get the blue color evaluated at the specified location
   * @param {Number} x The index of the point.
   */
  getBlueValue(x: number): number;

  /**
   * Get a table of RGB colors at regular intervals along the function
   * @param {Number} xStart The index of the first point.
   * @param {Number} xEnd The index of the second point.
   * @param {Number} size
   * @param {Number[]} table
   */
  getTable(xStart: number, xEnd: number, size: number, table: number[]): void;

  /**
   * @param {Number} xStart The index of the first point.
   * @param {Number} xEnd The index of the first point.
   * @param {Number} size
   * @param {Boolean} withAlpha
   */
  getUint8Table(
    xStart: number,
    xEnd: number,
    size: number,
    withAlpha: boolean
  ): Float32Array;

  /**
   * Construct a color transfer function from a vtkDataArray.
   * The order of values depends on the number of components
   * of the array.
   * 3 -> RGB
   * 4 -> XRGB
   * 5 -> RGBMS
   * 6 -> XRGBMS
   *
   * X represents the input value to a function
   * RGB represents the red, green, and blue value output
   * M represents the midpoint
   * S represents sharpness
   * @param {vtkDataArray} array
   */
  buildFunctionFromArray(array: vtkDataArray): void;

  /**
   * Construct a color transfer function from a table.
   * @param {Number} xStart The index of the first point.
   * @param {Number} xEnd The index of the first point.
   * @param {Number} size
   * @param {Number[]} table
   */
  buildFunctionFromTable(
    xStart: number,
    xEnd: number,
    size: number,
    table: number[]
  ): void;

  /**
   * For the node specified by index, set/get the location (X), R, G, and B
   * values, midpoint, and sharpness values at the node.
   * @param {Number} index
   * @param {Number[]} val
   */
  getNodeValue(index: number, val: number[]): number;

  /**
   * For a specified index value, set the node parameters
   * @param {Number} index
   * @param {Number[]} val
   */
  setNodeValue(index: number, val: number[]): number;

  /**
   * Get the number of available colors for mapping to.
   */
  getNumberOfAvailableColors(): number;

  /**
   * Get the color given an integer index.
   * @param {Number} idx The index of the point.
   * @param {Number[]} rgba An Array of the RGBA color.
   */
  getIndexedColor(idx: number, rgba: number[]): void;

  /**
   * Defines the nodes from an array ptr with the layout [X1, R1, G1, B1, X2,
   * R2, G2, B2, ..., Xn, Rn, Gn, Bn] where n is the number of nodes.
   * @param {Number} nb
   * @param ptr
   */
  fillFromDataPointer(nb: number, ptr: any): void;

  /**
   * Remove all points out of the new range, and make sure there is a point at
   * each end of that range.
   * @param {Number[]} range
   */
  adjustRange(range: number[]): number;

  /**
   * Estimates the minimum size of a table such that it would correctly sample this function.
   * @param {Number} x1
   * @param {Number} x2
   */
  estimateMinNumberOfSamples(x1: number, x2: number): number;

  /**
   * Traverses the nodes to find the minimum distance.
   */
  findMinimumXDistance(): number;

  /**
   *
   * @param input
   * @param output
   * @param outFormat
   * @param inputOffset
   */
  mapScalarsThroughTable(
    input: any,
    output: any,
    outFormat: any,
    inputOffset: any
  ): void;

  /**
   * Map a set of scalars through the lookup table.
   * @param input
   * @param output
   * @param outFormat
   * @param inputOffset
   */
  mapData(input: any, output: any, outFormat: any, inputOffset: any): void;

  /**
   * @param colorMap
   */
  applyColorMap(colorMap: any): void;
}

/**
 * Method use to decorate a given object (publicAPI+model) with vtkColorTransferFunction characteristics.
 *
 * @param publicAPI object on which methods will be bounds (public)
 * @param model object on which data structure will be bounds (protected)
 * @param {object} [initialValues] (default: {})
 */
export function extend(
  publicAPI: object,
  model: object,
  initialValues?: object
): void;

/**
 * Method use to create a new instance of vtkColorTransferFunction
 * @param {object} [initialValues] for pre-setting some of its content
 */
export function newInstance(initialValues?: object): vtkColorTransferFunction;

/**
 * vtkColorTransferFunction is a color mapping in RGB or HSV space that
 * uses piecewise hermite functions to allow interpolation that can be
 * piecewise constant, piecewise linear, or somewhere in-between
 * (a modified piecewise hermite function that squishes the function
 * according to a sharpness parameter). The function also allows for
 * the specification of the midpoint (the place where the function
 * reaches the average of the two bounding nodes) as a normalize distance
 * between nodes.
 * See the description of class vtkPiecewiseFunction for an explanation of
 * midpoint and sharpness.
 *
 * @example
 * ```js
 * // create color transfer function
 * const ctfun = vtkColorTransferFunction.newInstance();
 * ctfun.addRGBPoint(200.0, 1.0, 1.0, 1.0);
 * ctfun.addRGBPoint(2000.0, 0.0, 0.0, 0.0);
 * ```
 */

export declare const vtkColorTransferFunction: {
  newInstance: typeof newInstance;
  extend: typeof extend;
  ColorSpace: typeof ColorSpace;
  Scale: typeof Scale;
};
export default vtkColorTransferFunction;

index.js

import macro from 'vtk.js/Sources/macros';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkScalarsToColors from 'vtk.js/Sources/Common/Core/ScalarsToColors';
import Constants from 'vtk.js/Sources/Rendering/Core/ColorTransferFunction/Constants';

const { ColorSpace, Scale } = Constants;
const { ScalarMappingTarget } = vtkScalarsToColors;
const { vtkDebugMacro, vtkErrorMacro, vtkWarningMacro } = macro;

// ----------------------------------------------------------------------------
// Global methods
// ----------------------------------------------------------------------------
/* eslint-disable no-continue                                                */

// Convert to and from a special polar version of CIELAB (useful for creating
// continuous diverging color maps).
function vtkColorTransferFunctionLabToMsh(lab, msh) {
  const L = lab[0];
  const a = lab[1];
  const b = lab[2];
  const M = Math.sqrt(L * L + a * a + b * b);
  const s = M > 0.001 ? Math.acos(L / M) : 0.0;
  const h = s > 0.001 ? Math.atan2(b, a) : 0.0;
  msh[0] = M;
  msh[1] = s;
  msh[2] = h;
}

function vtkColorTransferFunctionMshToLab(msh, lab) {
  const M = msh[0];
  const s = msh[1];
  const h = msh[2];

  lab[0] = M * Math.cos(s);
  lab[1] = M * Math.sin(s) * Math.cos(h);
  lab[2] = M * Math.sin(s) * Math.sin(h);
}

// For the case when interpolating from a saturated color to an unsaturated
// color, find a hue for the unsaturated color that makes sense.
function vtkColorTransferFunctionAdjustHue(msh, unsatM) {
  if (msh[0] >= unsatM - 0.1) {
    // The best we can do is hold hue constant.
    return msh[2];
  }

  // This equation is designed to make the perceptual change of the
  // interpolation to be close to constant.
  const hueSpin =
    (msh[1] * Math.sqrt(unsatM * unsatM - msh[0] * msh[0])) /
    (msh[0] * Math.sin(msh[1]));
  // Spin hue away from 0 except in purple hues.
  if (msh[2] > -0.3 * Math.PI) {
    return msh[2] + hueSpin;
  }

  return msh[2] - hueSpin;
}

function vtkColorTransferFunctionAngleDiff(a1, a2) {
  let adiff = a1 - a2;
  if (adiff < 0.0) {
    adiff = -adiff;
  }
  while (adiff >= 2.0 * Math.PI) {
    adiff -= 2.0 * Math.PI;
  }
  if (adiff > Math.PI) {
    adiff = 2.0 * Math.PI - adiff;
  }
  return adiff;
}

// Interpolate a diverging color map.
function vtkColorTransferFunctionInterpolateDiverging(s, rgb1, rgb2, result) {
  const lab1 = [];
  const lab2 = [];
  vtkMath.rgb2lab(rgb1, lab1);
  vtkMath.rgb2lab(rgb2, lab2);

  const msh1 = [];
  const msh2 = [];
  vtkColorTransferFunctionLabToMsh(lab1, msh1);
  vtkColorTransferFunctionLabToMsh(lab2, msh2);

  // If the endpoints are distinct saturated colors, then place white in between
  // them.
  let localS = s;
  if (
    msh1[1] > 0.05 &&
    msh2[1] > 0.05 &&
    vtkColorTransferFunctionAngleDiff(msh1[2], msh2[2]) > 0.33 * Math.PI
  ) {
    // Insert the white midpoint by setting one end to white and adjusting the
    // scalar value.
    let Mmid = Math.max(msh1[0], msh2[0]);
    Mmid = Math.max(88.0, Mmid);
    if (s < 0.5) {
      msh2[0] = Mmid;
      msh2[1] = 0.0;
      msh2[2] = 0.0;
      localS *= 2.0;
    } else {
      msh1[0] = Mmid;
      msh1[1] = 0.0;
      msh1[2] = 0.0;
      localS = 2.0 * localS - 1.0;
    }
  }

  // If one color has no saturation, then its hue value is invalid.  In this
  // case, we want to set it to something logical so that the interpolation of
  // hue makes sense.
  if (msh1[1] < 0.05 && msh2[1] > 0.05) {
    msh1[2] = vtkColorTransferFunctionAdjustHue(msh2, msh1[0]);
  } else if (msh2[1] < 0.05 && msh1[1] > 0.05) {
    msh2[2] = vtkColorTransferFunctionAdjustHue(msh1, msh2[0]);
  }

  const mshTmp = [];
  mshTmp[0] = (1 - localS) * msh1[0] + localS * msh2[0];
  mshTmp[1] = (1 - localS) * msh1[1] + localS * msh2[1];
  mshTmp[2] = (1 - localS) * msh1[2] + localS * msh2[2];

  // Now convert back to RGB
  const labTmp = [];
  vtkColorTransferFunctionMshToLab(mshTmp, labTmp);
  vtkMath.lab2rgb(labTmp, result);
}

// ----------------------------------------------------------------------------
// vtkColorTransferFunction methods
// ----------------------------------------------------------------------------

function vtkColorTransferFunction(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkColorTransferFunction');

  // Return the number of points which specify this function
  publicAPI.getSize = () => model.nodes.length;

  //----------------------------------------------------------------------------
  // Add a point defined in RGB
  publicAPI.addRGBPoint = (x, r, g, b) =>
    publicAPI.addRGBPointLong(x, r, g, b, 0.5, 0.0);

  //----------------------------------------------------------------------------
  // Add a point defined in RGB
  publicAPI.addRGBPointLong = (x, r, g, b, midpoint = 0.5, sharpness = 0.0) => {
    // Error check
    if (midpoint < 0.0 || midpoint > 1.0) {
      vtkErrorMacro('Midpoint outside range [0.0, 1.0]');
      return -1;
    }

    if (sharpness < 0.0 || sharpness > 1.0) {
      vtkErrorMacro('Sharpness outside range [0.0, 1.0]');
      return -1;
    }

    // remove any node already at this X location
    if (!model.allowDuplicateScalars) {
      publicAPI.removePoint(x);
    }

    // Create the new node
    const node = { x, r, g, b, midpoint, sharpness };

    // Add it, then sort to get everything in order
    model.nodes.push(node);
    publicAPI.sortAndUpdateRange();

    // We need to find the index of the node we just added in order
    // to return this value
    let i = 0;
    for (; i < model.nodes.length; i++) {
      if (model.nodes[i].x === x) {
        break;
      }
    }

    // If we didn't find it, something went horribly wrong so
    // return -1
    if (i < model.nodes.length) {
      return i;
    }

    return -1;
  };

  //----------------------------------------------------------------------------
  // Add a point defined in HSV
  publicAPI.addHSVPoint = (x, h, s, v) =>
    publicAPI.addHSVPointLong(x, h, s, v, 0.5, 0.0);

  //----------------------------------------------------------------------------
  // Add a point defined in HSV
  publicAPI.addHSVPointLong = (x, h, s, v, midpoint = 0.5, sharpness = 0.0) => {
    const rgb = [];
    const hsv = [h, s, v];

    vtkMath.hsv2rgb(hsv, rgb);
    return publicAPI.addRGBPoint(
      x,
      rgb[0],
      rgb[1],
      rgb[2],
      midpoint,
      sharpness
    );
  };

  //----------------------------------------------------------------------------
  // Set nodes directly
  publicAPI.setNodes = (nodes) => {
    if (model.nodes !== nodes) {
      const before = JSON.stringify(model.nodes);
      model.nodes = nodes;
      const after = JSON.stringify(model.nodes);
      if (publicAPI.sortAndUpdateRange() || before !== after) {
        publicAPI.modified();
        return true;
      }
    }
    return false;
  };

  //----------------------------------------------------------------------------
  // Sort the vector in increasing order, then fill in
  // the Range
  publicAPI.sortAndUpdateRange = () => {
    const before = JSON.stringify(model.nodes);
    model.nodes.sort((a, b) => a.x - b.x);
    const after = JSON.stringify(model.nodes);

    const modifiedInvoked = publicAPI.updateRange();
    // If range is updated, Modified() has been called, don't call it again.
    if (!modifiedInvoked && before !== after) {
      publicAPI.modified();
      return true;
    }
    return modifiedInvoked;
  };

  //----------------------------------------------------------------------------
  publicAPI.updateRange = () => {
    const oldRange = [2];
    oldRange[0] = model.mappingRange[0];
    oldRange[1] = model.mappingRange[1];

    const size = model.nodes.length;
    if (size) {
      model.mappingRange[0] = model.nodes[0].x;
      model.mappingRange[1] = model.nodes[size - 1].x;
    } else {
      model.mappingRange[0] = 0;
      model.mappingRange[1] = 0;
    }

    // If the range is the same, then no need to call Modified()
    if (
      oldRange[0] === model.mappingRange[0] &&
      oldRange[1] === model.mappingRange[1]
    ) {
      return false;
    }

    publicAPI.modified();
    return true;
  };

  //----------------------------------------------------------------------------
  // Remove a point
  publicAPI.removePoint = (x) => {
    // First find the node since we need to know its
    // index as our return value
    let i = 0;
    for (; i < model.nodes.length; i++) {
      if (model.nodes[i].x === x) {
        break;
      }
    }

    const retVal = i;

    // If the node doesn't exist, we return -1
    if (i >= model.nodes.length) {
      return -1;
    }

    // If the first or last point has been removed, then we update the range
    // No need to sort here as the order of points hasn't changed.
    let modifiedInvoked = false;
    model.nodes.splice(i, 1);
    if (i === 0 || i === model.nodes.length) {
      modifiedInvoked = publicAPI.updateRange();
    }
    if (!modifiedInvoked) {
      publicAPI.modified();
    }

    return retVal;
  };

  //----------------------------------------------------------------------------
  publicAPI.movePoint = (oldX, newX) => {
    if (oldX === newX) {
      // Nothing to do.
      return;
    }

    publicAPI.removePoint(newX);
    for (let i = 0; i < model.nodes.length; i++) {
      if (model.nodes[i].x === oldX) {
        model.nodes[i].x = newX;
        publicAPI.sortAndUpdateRange();
        break;
      }
    }
  };

  //----------------------------------------------------------------------------
  // Remove all points
  publicAPI.removeAllPoints = () => {
    model.nodes = [];
    publicAPI.sortAndUpdateRange();
  };

  //----------------------------------------------------------------------------
  // Add a line defined in RGB
  publicAPI.addRGBSegment = (x1, r1, g1, b1, x2, r2, g2, b2) => {
    // First, find all points in this range and remove them
    publicAPI.sortAndUpdateRange();
    for (let i = 0; i < model.nodes.length; ) {
      if (model.nodes[i].x >= x1 && model.nodes[i].x <= x2) {
        model.nodes.splice(i, 1);
      } else {
        i++;
      }
    }

    // Now add the points
    publicAPI.addRGBPointLong(x1, r1, g1, b1, 0.5, 0.0);
    publicAPI.addRGBPointLong(x2, r2, g2, b2, 0.5, 0.0);
    publicAPI.modified();
  };

  //----------------------------------------------------------------------------
  // Add a line defined in HSV
  publicAPI.addHSVSegment = (x1, h1, s1, v1, x2, h2, s2, v2) => {
    const hsv1 = [h1, s1, v1];
    const hsv2 = [h2, s2, v2];
    const rgb1 = [];
    const rgb2 = [];

    vtkMath.hsv2rgb(hsv1, rgb1);
    vtkMath.hsv2rgb(hsv2, rgb2);
    publicAPI.addRGBSegment(
      x1,
      rgb1[0],
      rgb1[1],
      rgb1[2],
      x2,
      rgb2[0],
      rgb2[1],
      rgb2[2]
    );
  };

  //----------------------------------------------------------------------------
  // Returns the RGBA color evaluated at the specified location
  publicAPI.mapValue = (x) => {
    const rgb = [];
    publicAPI.getColor(x, rgb);

    return [
      Math.floor(255.0 * rgb[0] + 0.5),
      Math.floor(255.0 * rgb[1] + 0.5),
      Math.floor(255.0 * rgb[2] + 0.5),
      255,
    ];
  };

  //----------------------------------------------------------------------------
  // Returns the RGB color evaluated at the specified location
  publicAPI.getColor = (x, rgb) => {
    if (model.indexedLookup) {
      const numNodes = publicAPI.getSize();
      // todo
      const idx = publicAPI.getAnnotatedValueIndexInternal(x);
      if (idx < 0 || numNodes === 0) {
        const nanColor = publicAPI.getNanColorByReference();
        rgb[0] = nanColor[0];
        rgb[1] = nanColor[1];
        rgb[2] = nanColor[2];
      } else {
        const nodeVal = [];
        publicAPI.getNodeValue(idx % numNodes, nodeVal);
        // nodeVal[0] is the x value. nodeVal[1...3] is rgb.
        rgb[0] = nodeVal[1];
        rgb[1] = nodeVal[2];
        rgb[2] = nodeVal[3];
      }
      return;
    }
    publicAPI.getTable(x, x, 1, rgb);
  };

  //----------------------------------------------------------------------------
  // Returns the red color evaluated at the specified location
  publicAPI.getRedValue = (x) => {
    const rgb = [];
    publicAPI.getColor(x, rgb);
    return rgb[0];
  };

  //----------------------------------------------------------------------------
  // Returns the green color evaluated at the specified location
  publicAPI.getGreenValue = (x) => {
    const rgb = [];
    publicAPI.getColor(x, rgb);
    return rgb[1];
  };

  //----------------------------------------------------------------------------
  // Returns the blue color evaluated at the specified location
  publicAPI.getBlueValue = (x) => {
    const rgb = [];
    publicAPI.getColor(x, rgb);
    return rgb[2];
  };

  //----------------------------------------------------------------------------
  // Returns a table of RGB colors at regular intervals along the function
  publicAPI.getTable = (xStart_, xEnd_, size, table) => {
    // To handle BigInt limitation
    const xStart = Number(xStart_);
    const xEnd = Number(xEnd_);

    // Special case: If either the start or end is a NaN, then all any
    // interpolation done on them is also a NaN.  Therefore, fill the table with
    // the NaN color.
    if (vtkMath.isNan(xStart) || vtkMath.isNan(xEnd)) {
      for (let i = 0; i < size; i++) {
        table[i * 3 + 0] = model.nanColor[0];
        table[i * 3 + 1] = model.nanColor[1];
        table[i * 3 + 2] = model.nanColor[2];
      }
      return;
    }

    let idx = 0;
    const numNodes = model.nodes.length;

    // Need to keep track of the last value so that
    // we can fill in table locations past this with
    // this value if Clamping is On.
    let lastR = 0.0;
    let lastG = 0.0;
    let lastB = 0.0;
    if (numNodes !== 0) {
      lastR = model.nodes[numNodes - 1].r;
      lastG = model.nodes[numNodes - 1].g;
      lastB = model.nodes[numNodes - 1].b;
    }

    let x = 0.0;
    let x1 = 0.0;
    let x2 = 0.0;
    const rgb1 = [0.0, 0.0, 0.0];
    const rgb2 = [0.0, 0.0, 0.0];
    let midpoint = 0.0;
    let sharpness = 0.0;

    const tmpVec = [];

    // If the scale is logarithmic, make sure the range is valid.
    let usingLogScale = model.scale === Scale.LOG10;
    if (usingLogScale) {
      // Note: This requires range[0] <= range[1].
      usingLogScale = model.mappingRange[0] > 0.0;
    }

    let logStart = 0.0;
    let logEnd = 0.0;
    let logX = 0.0;
    if (usingLogScale) {
      logStart = Math.log10(xStart);
      logEnd = Math.log10(xEnd);
    }

    // For each table entry
    for (let i = 0; i < size; i++) {
      // Find our location in the table
      const tidx = 3 * i;

      // Find our X location. If we are taking only 1 sample, make
      // it halfway between start and end (usually start and end will
      // be the same in this case)
      if (size > 1) {
        if (usingLogScale) {
          logX = logStart + (i / (size - 1.0)) * (logEnd - logStart);
          x = 10.0 ** logX;
        } else {
          x = xStart + (i / (size - 1.0)) * (xEnd - xStart);
        }
      } else if (usingLogScale) {
        logX = 0.5 * (logStart + logEnd);
        x = 10.0 ** logX;
      } else {
        x = 0.5 * (xStart + xEnd);
      }

      // Linearly map x from mappingRange to [0, numberOfValues-1],
      // discretize (round down to the closest integer),
      // then map back to mappingRange
      if (model.discretize) {
        const range = model.mappingRange;
        if (x >= range[0] && x <= range[1]) {
          const numberOfValues = model.numberOfValues;
          const deltaRange = range[1] - range[0];
          if (numberOfValues <= 1) {
            x = range[0] + deltaRange / 2.0;
          } else {
            // normalize x
            const xn = (x - range[0]) / deltaRange;
            // discretize
            const discretizeIndex = vtkMath.floor(numberOfValues * xn);
            // get discretized x
            x =
              range[0] + (discretizeIndex / (numberOfValues - 1)) * deltaRange;
          }
        }
      }

      // Do we need to move to the next node?
      while (idx < numNodes && x > model.nodes[idx].x) {
        idx++;
        // If we are at a valid point index, fill in
        // the value at this node, and the one before (the
        // two that surround our current sample location)
        // idx cannot be 0 since we just incremented it.
        if (idx < numNodes) {
          x1 = model.nodes[idx - 1].x;
          x2 = model.nodes[idx].x;
          if (usingLogScale) {
            x1 = Math.log10(x1);
            x2 = Math.log10(x2);
          }

          rgb1[0] = model.nodes[idx - 1].r;
          rgb2[0] = model.nodes[idx].r;

          rgb1[1] = model.nodes[idx - 1].g;
          rgb2[1] = model.nodes[idx].g;

          rgb1[2] = model.nodes[idx - 1].b;
          rgb2[2] = model.nodes[idx].b;

          // We only need the previous midpoint and sharpness
          // since these control this region
          midpoint = model.nodes[idx - 1].midpoint;
          sharpness = model.nodes[idx - 1].sharpness;

          // Move midpoint away from extreme ends of range to avoid
          // degenerate math
          if (midpoint < 0.00001) {
            midpoint = 0.00001;
          }

          if (midpoint > 0.99999) {
            midpoint = 0.99999;
          }
        }
      }

      // Are we at or past the end? If so, just use the last value
      if (x > model.mappingRange[1]) {
        table[tidx] = 0.0;
        table[tidx + 1] = 0.0;
        table[tidx + 2] = 0.0;
        if (model.clamping) {
          if (publicAPI.getUseAboveRangeColor()) {
            table[tidx] = model.aboveRangeColor[0];
            table[tidx + 1] = model.aboveRangeColor[1];
            table[tidx + 2] = model.aboveRangeColor[2];
          } else {
            table[tidx] = lastR;
            table[tidx + 1] = lastG;
            table[tidx + 2] = lastB;
          }
        }
      } else if (x < model.mappingRange[0] || (vtkMath.isInf(x) && x < 0)) {
        // we are before the first node? If so, duplicate this node's values.
        // We have to deal with -inf here
        table[tidx] = 0.0;
        table[tidx + 1] = 0.0;
        table[tidx + 2] = 0.0;
        if (model.clamping) {
          if (publicAPI.getUseBelowRangeColor()) {
            table[tidx] = model.belowRangeColor[0];
            table[tidx + 1] = model.belowRangeColor[1];
            table[tidx + 2] = model.belowRangeColor[2];
          } else if (numNodes > 0) {
            table[tidx] = model.nodes[0].r;
            table[tidx + 1] = model.nodes[0].g;
            table[tidx + 2] = model.nodes[0].b;
          }
        }
      } else if (
        idx === 0 &&
        (Math.abs(x - xStart) < 1e-6 || model.discretize)
      ) {
        if (numNodes > 0) {
          table[tidx] = model.nodes[0].r;
          table[tidx + 1] = model.nodes[0].g;
          table[tidx + 2] = model.nodes[0].b;
        } else {
          table[tidx] = 0.0;
          table[tidx + 1] = 0.0;
          table[tidx + 2] = 0.0;
        }
      } else {
        // OK, we are between two nodes - interpolate
        // Our first attempt at a normalized location [0,1] -
        // we will be modifying this based on midpoint and
        // sharpness to get the curve shape we want and to have
        // it pass through (y1+y2)/2 at the midpoint.
        let s = 0.0;
        if (usingLogScale) {
          s = (logX - x1) / (x2 - x1);
        } else {
          s = (x - x1) / (x2 - x1);
        }

        // Readjust based on the midpoint - linear adjustment
        if (s < midpoint) {
          s = (0.5 * s) / midpoint;
        } else {
          s = 0.5 + (0.5 * (s - midpoint)) / (1.0 - midpoint);
        }

        // override for sharpness > 0.99
        // In this case we just want piecewise constant
        if (sharpness > 0.99) {
          // Use the first value since we are below the midpoint
          if (s < 0.5) {
            table[tidx] = rgb1[0];
            table[tidx + 1] = rgb1[1];
            table[tidx + 2] = rgb1[2];
            continue;
          } else {
            // Use the second value at or above the midpoint
            table[tidx] = rgb2[0];
            table[tidx + 1] = rgb2[1];
            table[tidx + 2] = rgb2[2];
            continue;
          }
        }

        // Override for sharpness < 0.01
        // In this case we want piecewise linear
        if (sharpness < 0.01) {
          // Simple linear interpolation
          if (model.colorSpace === ColorSpace.RGB) {
            table[tidx] = (1 - s) * rgb1[0] + s * rgb2[0];
            table[tidx + 1] = (1 - s) * rgb1[1] + s * rgb2[1];
            table[tidx + 2] = (1 - s) * rgb1[2] + s * rgb2[2];
          } else if (model.colorSpace === ColorSpace.HSV) {
            const hsv1 = [];
            const hsv2 = [];
            vtkMath.rgb2hsv(rgb1, hsv1);
            vtkMath.rgb2hsv(rgb2, hsv2);

            if (
              model.hSVWrap &&
              (hsv1[0] - hsv2[0] > 0.5 || hsv2[0] - hsv1[0] > 0.5)
            ) {
              if (hsv1[0] > hsv2[0]) {
                hsv1[0] -= 1.0;
              } else {
                hsv2[0] -= 1.0;
              }
            }

            const hsvTmp = [];
            hsvTmp[0] = (1.0 - s) * hsv1[0] + s * hsv2[0];
            if (hsvTmp[0] < 0.0) {
              hsvTmp[0] += 1.0;
            }
            hsvTmp[1] = (1.0 - s) * hsv1[1] + s * hsv2[1];
            hsvTmp[2] = (1.0 - s) * hsv1[2] + s * hsv2[2];

            // Now convert this back to RGB
            vtkMath.hsv2rgb(hsvTmp, tmpVec);
            table[tidx] = tmpVec[0];
            table[tidx + 1] = tmpVec[1];
            table[tidx + 2] = tmpVec[2];
          } else if (model.colorSpace === ColorSpace.LAB) {
            const lab1 = [];
            const lab2 = [];
            vtkMath.rgb2lab(rgb1, lab1);
            vtkMath.rgb2lab(rgb2, lab2);

            const labTmp = [];
            labTmp[0] = (1 - s) * lab1[0] + s * lab2[0];
            labTmp[1] = (1 - s) * lab1[1] + s * lab2[1];
            labTmp[2] = (1 - s) * lab1[2] + s * lab2[2];

            // Now convert back to RGB
            vtkMath.lab2rgb(labTmp, tmpVec);
            table[tidx] = tmpVec[0];
            table[tidx + 1] = tmpVec[1];
            table[tidx + 2] = tmpVec[2];
          } else if (model.colorSpace === ColorSpace.DIVERGING) {
            vtkColorTransferFunctionInterpolateDiverging(s, rgb1, rgb2, tmpVec);
            table[tidx] = tmpVec[0];
            table[tidx + 1] = tmpVec[1];
            table[tidx + 2] = tmpVec[2];
          } else {
            vtkErrorMacro('ColorSpace set to invalid value.', model.colorSpace);
          }
          continue;
        }

        // We have a sharpness between [0.01, 0.99] - we will
        // used a modified hermite curve interpolation where we
        // derive the slope based on the sharpness, and we compress
        // the curve non-linearly based on the sharpness

        // First, we will adjust our position based on sharpness in
        // order to make the curve sharper (closer to piecewise constant)
        if (s < 0.5) {
          s = 0.5 * (s * 2.0) ** (1.0 + 10.0 * sharpness);
        } else if (s > 0.5) {
          s = 1.0 - 0.5 * ((1.0 - s) * 2) ** (1 + 10.0 * sharpness);
        }

        // Compute some coefficients we will need for the hermite curve
        const ss = s * s;
        const sss = ss * s;

        const h1 = 2.0 * sss - 3 * ss + 1;
        const h2 = -2 * sss + 3 * ss;
        const h3 = sss - 2 * ss + s;
        const h4 = sss - ss;

        let slope;
        let t;

        if (model.colorSpace === ColorSpace.RGB) {
          for (let j = 0; j < 3; j++) {
            // Use one slope for both end points
            slope = rgb2[j] - rgb1[j];
            t = (1.0 - sharpness) * slope;

            // Compute the value
            table[tidx + j] = h1 * rgb1[j] + h2 * rgb2[j] + h3 * t + h4 * t;
          }
        } else if (model.colorSpace === ColorSpace.HSV) {
          const hsv1 = [];
          const hsv2 = [];
          vtkMath.rgb2hsv(rgb1, hsv1);
          vtkMath.rgb2hsv(rgb2, hsv2);

          if (
            model.hSVWrap &&
            (hsv1[0] - hsv2[0] > 0.5 || hsv2[0] - hsv1[0] > 0.5)
          ) {
            if (hsv1[0] > hsv2[0]) {
              hsv1[0] -= 1.0;
            } else {
              hsv2[0] -= 1.0;
            }
          }

          const hsvTmp = [];

          for (let j = 0; j < 3; j++) {
            // Use one slope for both end points
            slope = hsv2[j] - hsv1[j];
            t = (1.0 - sharpness) * slope;

            // Compute the value
            hsvTmp[j] = h1 * hsv1[j] + h2 * hsv2[j] + h3 * t + h4 * t;
            if (j === 0 && hsvTmp[j] < 0.0) {
              hsvTmp[j] += 1.0;
            }
          }
          // Now convert this back to RGB
          vtkMath.hsv2rgb(hsvTmp, tmpVec);
          table[tidx] = tmpVec[0];
          table[tidx + 1] = tmpVec[1];
          table[tidx + 2] = tmpVec[2];
        } else if (model.colorSpace === ColorSpace.LAB) {
          const lab1 = [];
          const lab2 = [];
          vtkMath.rgb2lab(rgb1, lab1);
          vtkMath.rgb2lab(rgb2, lab2);

          const labTmp = [];
          for (let j = 0; j < 3; j++) {
            // Use one slope for both end points
            slope = lab2[j] - lab1[j];
            t = (1.0 - sharpness) * slope;

            // Compute the value
            labTmp[j] = h1 * lab1[j] + h2 * lab2[j] + h3 * t + h4 * t;
          }
          // Now convert this back to RGB
          vtkMath.lab2rgb(labTmp, tmpVec);
          table[tidx] = tmpVec[0];
          table[tidx + 1] = tmpVec[1];
          table[tidx + 2] = tmpVec[2];
        } else if (model.colorSpace === ColorSpace.DIVERGING) {
          // I have not implemented proper interpolation by a hermite curve for
          // the diverging color map, but I cannot think of a good use case for
          // that anyway.
          vtkColorTransferFunctionInterpolateDiverging(s, rgb1, rgb2, tmpVec);
          table[tidx] = tmpVec[0];
          table[tidx + 1] = tmpVec[1];
          table[tidx + 2] = tmpVec[2];
        } else {
          vtkErrorMacro('ColorSpace set to invalid value.');
        }

        // Final error check to make sure we don't go outside [0,1]
        for (let j = 0; j < 3; j++) {
          table[tidx + j] = table[tidx + j] < 0.0 ? 0.0 : table[tidx + j];
          table[tidx + j] = table[tidx + j] > 1.0 ? 1.0 : table[tidx + j];
        }
      }
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.getUint8Table = (xStart, xEnd, size, withAlpha = false) => {
    if (
      publicAPI.getMTime() <= model.buildTime &&
      model.tableSize === size &&
      model.tableWithAlpha !== withAlpha
    ) {
      return model.table;
    }

    if (model.nodes.length === 0) {
      vtkErrorMacro(
        'Attempting to lookup a value with no points in the function'
      );
      return model.table;
    }

    const nbChannels = withAlpha ? 4 : 3;
    if (model.tableSize !== size || model.tableWithAlpha !== withAlpha) {
      model.table = new Uint8Array(size * nbChannels);
      model.tableSize = size;
      model.tableWithAlpha = withAlpha;
    }

    const tmpTable = [];
    publicAPI.getTable(xStart, xEnd, size, tmpTable);

    for (let i = 0; i < size; i++) {
      model.table[i * nbChannels + 0] = Math.floor(
        tmpTable[i * 3 + 0] * 255.0 + 0.5
      );
      model.table[i * nbChannels + 1] = Math.floor(
        tmpTable[i * 3 + 1] * 255.0 + 0.5
      );
      model.table[i * nbChannels + 2] = Math.floor(
        tmpTable[i * 3 + 2] * 255.0 + 0.5
      );
      if (withAlpha) {
        model.table[i * nbChannels + 3] = 255;
      }
    }

    model.buildTime.modified();
    return model.table;
  };

  publicAPI.buildFunctionFromArray = (array) => {
    publicAPI.removeAllPoints();
    const numComponents = array.getNumberOfComponents();
    for (let i = 0; i < array.getNumberOfTuples(); i++) {
      switch (numComponents) {
        case 3: {
          model.nodes.push({
            x: i,
            r: array.getComponent(i, 0),
            g: array.getComponent(i, 1),
            b: array.getComponent(i, 2),
            midpoint: 0.5,
            sharpness: 0.0,
          });
          break;
        }
        case 4: {
          model.nodes.push({
            x: array.getComponent(i, 0),
            r: array.getComponent(i, 1),
            g: array.getComponent(i, 2),
            b: array.getComponent(i, 3),
            midpoint: 0.5,
            sharpness: 0.0,
          });
          break;
        }
        case 5: {
          model.nodes.push({
            x: i,
            r: array.getComponent(i, 0),
            g: array.getComponent(i, 1),
            b: array.getComponent(i, 2),
            midpoint: array.getComponent(i, 4),
            sharpness: array.getComponent(i, 5),
          });
          break;
        }
        case 6: {
          model.nodes.push({
            x: array.getComponent(i, 0),
            r: array.getComponent(i, 1),
            g: array.getComponent(i, 2),
            b: array.getComponent(i, 3),
            midpoint: array.getComponent(i, 4),
            sharpness: array.getComponent(i, 5),
          });
          break;
        }
        default: {
          break;
        }
      }
    }
    publicAPI.sortAndUpdateRange();
  };

  //----------------------------------------------------------------------------
  publicAPI.buildFunctionFromTable = (xStart, xEnd, size, table) => {
    let inc = 0.0;

    publicAPI.removeAllPoints();

    if (size > 1) {
      inc = (xEnd - xStart) / (size - 1.0);
    }

    for (let i = 0; i < size; i++) {
      const node = {
        x: xStart + inc * i,
        r: table[i * 3],
        g: table[i * 3 + 1],
        b: table[i * 3 + 2],
        sharpness: 0.0,
        midpoint: 0.5,
      };
      model.nodes.push(node);
    }

    publicAPI.sortAndUpdateRange();
  };

  //----------------------------------------------------------------------------
  // For a specified index value, get the node parameters
  publicAPI.getNodeValue = (index, val) => {
    if (index < 0 || index >= model.nodes.length) {
      vtkErrorMacro('Index out of range!');
      return -1;
    }

    val[0] = model.nodes[index].x;
    val[1] = model.nodes[index].r;
    val[2] = model.nodes[index].g;
    val[3] = model.nodes[index].b;
    val[4] = model.nodes[index].midpoint;
    val[5] = model.nodes[index].sharpness;

    return 1;
  };

  //----------------------------------------------------------------------------
  // For a specified index value, get the node parameters
  publicAPI.setNodeValue = (index, val) => {
    if (index < 0 || index >= model.nodes.length) {
      vtkErrorMacro('Index out of range!');
      return -1;
    }

    const oldX = model.nodes[index].x;
    model.nodes[index].x = val[0];
    model.nodes[index].r = val[1];
    model.nodes[index].g = val[2];
    model.nodes[index].b = val[3];
    model.nodes[index].midpoint = val[4];
    model.nodes[index].sharpness = val[5];

    if (oldX !== val[0]) {
      // The point has been moved, the order of points or the range might have
      // been modified.
      publicAPI.sortAndUpdateRange();
      // No need to call Modified() here because SortAndUpdateRange() has done it
      // already.
    } else {
      publicAPI.modified();
    }

    return 1;
  };

  //----------------------------------------------------------------------------
  publicAPI.getNumberOfAvailableColors = () => {
    if (model.indexedLookup && publicAPI.getSize()) {
      return publicAPI.getSize();
    }
    if (model.tableSize) {
      // Not sure if this is correct since it is only set if
      // "const unsigned char *::GetTable(double xStart, double xEnd,int size)"
      // has been called.
      return model.tableSize;
    }
    const nNodes = model.nodes?.length ?? 0;
    // The minimum is 4094 colors so that it fills in the 4096 texels texture in `mapScalarsToTexture`
    return Math.max(4094, nNodes);
  };

  //----------------------------------------------------------------------------
  publicAPI.getIndexedColor = (idx, rgba) => {
    const n = publicAPI.getSize();
    if (n > 0 && idx >= 0) {
      const nodeValue = [];
      publicAPI.getNodeValue(idx % n, nodeValue);
      for (let j = 0; j < 3; ++j) {
        rgba[j] = nodeValue[j + 1];
      }
      rgba[3] = 1.0; // NodeColor is RGB-only.
      return;
    }
    const nanColor = publicAPI.getNanColorByReference();
    rgba[0] = nanColor[0];
    rgba[1] = nanColor[1];
    rgba[2] = nanColor[2];
    rgba[3] = 1.0; // NanColor is RGB-only.
  };

  //----------------------------------------------------------------------------
  publicAPI.fillFromDataPointer = (nb, ptr) => {
    if (nb <= 0 || !ptr) {
      return;
    }

    publicAPI.removeAllPoints();

    for (let i = 0; i < nb; i++) {
      publicAPI.addRGBPoint(
        ptr[i * 4],
        ptr[i * 4 + 1],
        ptr[i * 4 + 2],
        ptr[i * 4 + 3]
      );
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.setMappingRange = (min, max) => {
    const range = [min, max];
    const originalRange = publicAPI.getRange();
    if (originalRange[1] === range[1] && originalRange[0] === range[0]) {
      return;
    }

    if (range[1] === range[0]) {
      vtkErrorMacro('attempt to set zero width color range');
      return;
    }

    const scale = (range[1] - range[0]) / (originalRange[1] - originalRange[0]);
    const shift = range[0] - originalRange[0] * scale;

    for (let i = 0; i < model.nodes.length; ++i) {
      model.nodes[i].x = model.nodes[i].x * scale + shift;
    }

    model.mappingRange[0] = range[0];
    model.mappingRange[1] = range[1];
    publicAPI.modified();
  };

  //----------------------------------------------------------------------------
  publicAPI.adjustRange = (range) => {
    const functionRange = publicAPI.getRange();

    // Make sure we have points at each end of the range
    const rgb = [];
    if (functionRange[0] < range[0]) {
      publicAPI.getColor(range[0], rgb);
      publicAPI.addRGBPoint(range[0], rgb[0], rgb[1], rgb[2]);
    } else {
      publicAPI.getColor(functionRange[0], rgb);
      publicAPI.addRGBPoint(range[0], rgb[0], rgb[1], rgb[2]);
    }

    if (functionRange[1] > range[1]) {
      publicAPI.getColor(range[1], rgb);
      publicAPI.addRGBPoint(range[1], rgb[0], rgb[1], rgb[2]);
    } else {
      publicAPI.getColor(functionRange[1], rgb);
      publicAPI.addRGBPoint(range[1], rgb[0], rgb[1], rgb[2]);
    }

    // Remove all points out-of-range
    publicAPI.sortAndUpdateRange();
    for (let i = 0; i < model.nodes.length; ) {
      if (model.nodes[i].x >= range[0] && model.nodes[i].x <= range[1]) {
        model.nodes.splice(i, 1);
      } else {
        ++i;
      }
    }

    return 1;
  };

  //--------------------------------------------------------------------------
  publicAPI.estimateMinNumberOfSamples = (x1, x2) => {
    const d = publicAPI.findMinimumXDistance();
    return Math.ceil((x2 - x1) / d);
  };

  //----------------------------------------------------------------------------
  publicAPI.findMinimumXDistance = () => {
    if (model.nodes.length < 2) {
      return -1.0;
    }

    let distance = Number.MAX_VALUE;
    for (let i = 0; i < model.nodes.length - 1; i++) {
      const currentDist = model.nodes[i + 1].x - model.nodes[i].x;
      if (currentDist < distance) {
        distance = currentDist;
      }
    }

    return distance;
  };

  publicAPI.mapScalarsThroughTable = (
    input,
    output,
    outFormat,
    inputOffset
  ) => {
    if (publicAPI.getSize() === 0) {
      vtkDebugMacro('Transfer Function Has No Points!');
      return;
    }

    if (model.indexedLookup) {
      publicAPI.mapDataIndexed(input, output, outFormat, inputOffset);
    } else {
      publicAPI.mapData(input, output, outFormat, inputOffset);
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.mapData = (input, output, outFormat, inputOffset) => {
    if (publicAPI.getSize() === 0) {
      vtkWarningMacro('Transfer Function Has No Points!');
      return;
    }

    const alpha = Math.floor(publicAPI.getAlpha() * 255.0 + 0.5);
    const length = input.getNumberOfTuples();
    const inIncr = input.getNumberOfComponents();

    const outputV = output.getData();
    const inputV = input.getData();
    const rgb = [];

    if (outFormat === ScalarMappingTarget.RGBA) {
      for (let i = 0; i < length; i++) {
        const x = inputV[i * inIncr + inputOffset];
        publicAPI.getColor(x, rgb);
        outputV[i * 4] = Math.floor(rgb[0] * 255.0 + 0.5);
        outputV[i * 4 + 1] = Math.floor(rgb[1] * 255.0 + 0.5);
        outputV[i * 4 + 2] = Math.floor(rgb[2] * 255.0 + 0.5);
        outputV[i * 4 + 3] = alpha;
      }
    }

    if (outFormat === ScalarMappingTarget.RGB) {
      for (let i = 0; i < length; i++) {
        const x = inputV[i * inIncr + inputOffset];
        publicAPI.getColor(x, rgb);
        outputV[i * 3] = Math.floor(rgb[0] * 255.0 + 0.5);
        outputV[i * 3 + 1] = Math.floor(rgb[1] * 255.0 + 0.5);
        outputV[i * 3 + 2] = Math.floor(rgb[2] * 255.0 + 0.5);
      }
    }

    if (outFormat === ScalarMappingTarget.LUMINANCE) {
      for (let i = 0; i < length; i++) {
        const x = inputV[i * inIncr + inputOffset];
        publicAPI.getColor(x, rgb);
        outputV[i] = Math.floor(
          rgb[0] * 76.5 + rgb[1] * 150.45 + rgb[2] * 28.05 + 0.5
        );
      }
    }

    if (outFormat === ScalarMappingTarget.LUMINANCE_ALPHA) {
      for (let i = 0; i < length; i++) {
        const x = inputV[i * inIncr + inputOffset];
        publicAPI.getColor(x, rgb);
        outputV[i * 2] = Math.floor(
          rgb[0] * 76.5 + rgb[1] * 150.45 + rgb[2] * 28.05 + 0.5
        );
        outputV[i * 2 + 1] = alpha;
      }
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.applyColorMap = (colorMap) => {
    const oldColorSpace = JSON.stringify(model.colorSpace);
    if (colorMap.ColorSpace) {
      model.colorSpace = ColorSpace[colorMap.ColorSpace.toUpperCase()];
      if (model.colorSpace === undefined) {
        vtkErrorMacro(
          `ColorSpace ${colorMap.ColorSpace} not supported, using RGB instead`
        );
        model.colorSpace = ColorSpace.RGB;
      }
    }
    let isModified = oldColorSpace !== JSON.stringify(model.colorSpace);

    const oldNanColor = isModified || JSON.stringify(model.nanColor);
    if (colorMap.NanColor) {
      model.nanColor = [].concat(colorMap.NanColor);
      while (model.nanColor.length < 4) {
        model.nanColor.push(1.0);
      }
    }
    isModified = isModified || oldNanColor !== JSON.stringify(model.nanColor);

    const oldNodes = isModified || JSON.stringify(model.nodes);
    if (colorMap.RGBPoints) {
      const size = colorMap.RGBPoints.length;
      model.nodes = [];
      const midpoint = 0.5;
      const sharpness = 0.0;
      for (let i = 0; i < size; i += 4) {
        model.nodes.push({
          x: colorMap.RGBPoints[i],
          r: colorMap.RGBPoints[i + 1],
          g: colorMap.RGBPoints[i + 2],
          b: colorMap.RGBPoints[i + 3],
          midpoint,
          sharpness,
        });
      }
    }

    const modifiedInvoked = publicAPI.sortAndUpdateRange();

    const callModified =
      !modifiedInvoked &&
      (isModified || oldNodes !== JSON.stringify(model.nodes));
    if (callModified) publicAPI.modified();

    return modifiedInvoked || callModified;
  };
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
  clamping: true,
  colorSpace: ColorSpace.RGB,
  hSVWrap: true,
  scale: Scale.LINEAR,

  nanColor: null,
  belowRangeColor: null,
  aboveRangeColor: null,
  useAboveRangeColor: false,
  useBelowRangeColor: false,

  allowDuplicateScalars: false,

  table: null,
  tableSize: 0,
  buildTime: null,

  nodes: null,

  discretize: false,
  numberOfValues: 256,
};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
  Object.assign(model, DEFAULT_VALUES, initialValues);

  // Inheritance
  vtkScalarsToColors.extend(publicAPI, model, initialValues);

  // Internal objects initialization
  model.table = [];
  model.nodes = [];

  model.nanColor = [0.5, 0.0, 0.0, 1.0];
  model.belowRangeColor = [0.0, 0.0, 0.0, 1.0];
  model.aboveRangeColor = [1.0, 1.0, 1.0, 1.0];

  model.buildTime = {};
  macro.obj(model.buildTime);

  // Create get-only macros
  macro.get(publicAPI, model, ['buildTime', 'mappingRange']);

  // Create get-set macros
  macro.setGet(publicAPI, model, [
    'useAboveRangeColor',
    'useBelowRangeColor',
    'discretize',
    'numberOfValues',
    { type: 'enum', name: 'colorSpace', enum: ColorSpace },
    { type: 'enum', name: 'scale', enum: Scale },
  ]);

  macro.setArray(
    publicAPI,
    model,
    ['nanColor', 'belowRangeColor', 'aboveRangeColor'],
    4
  );

  // Create get macros for array
  macro.getArray(publicAPI, model, [
    'nanColor',
    'belowRangeColor',
    'aboveRangeColor',
  ]);

  // For more macro methods, see "Sources/macros.js"

  // Object specific methods
  vtkColorTransferFunction(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(
  extend,
  'vtkColorTransferFunction'
);

// ----------------------------------------------------------------------------

export default { newInstance, extend, ...Constants };