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import vtkAbstractPicker from 'vtk.js/Sources/Rendering/Core/AbstractPicker';
import vtkBoundingBox from 'vtk.js/Sources/Common/DataModel/BoundingBox';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import { mat4, vec3, vec4 } from 'gl-matrix';
const { vtkErrorMacro } = macro;
const { vtkWarningMacro } = macro;
// ----------------------------------------------------------------------------
// vtkPicker methods
// ----------------------------------------------------------------------------
function vtkPicker(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkPicker');
const superClass = { ...publicAPI };
function initialize() {
superClass.initialize();
model.actors = [];
model.pickedPositions = [];
model.mapperPosition[0] = 0.0;
model.mapperPosition[1] = 0.0;
model.mapperPosition[2] = 0.0;
model.mapper = null;
model.dataSet = null;
model.globalTMin = Number.MAX_VALUE;
}
/**
* Compute the tolerance in world coordinates.
* Do this by determining the world coordinates of the diagonal points of the
* window, computing the width of the window in world coordinates, and
* multiplying by the tolerance.
* @param {Number} selectionZ
* @param {Number} aspect
* @param {vtkRenderer} renderer
* @returns {Number} the computed tolerance
*/
function computeTolerance(selectionZ, aspect, renderer) {
let tolerance = 0.0;
const view = renderer.getRenderWindow().getViews()[0];
const viewport = renderer.getViewport();
const winSize = view.getSize();
let x = winSize[0] * viewport[0];
let y = winSize[1] * viewport[1];
const normalizedLeftDisplay = view.displayToNormalizedDisplay(
x,
y,
selectionZ
);
const windowLowerLeft = renderer.normalizedDisplayToWorld(
normalizedLeftDisplay[0],
normalizedLeftDisplay[1],
normalizedLeftDisplay[2],
aspect
);
x = winSize[0] * viewport[2];
y = winSize[1] * viewport[3];
const normalizedRightDisplay = view.displayToNormalizedDisplay(
x,
y,
selectionZ
);
const windowUpperRight = renderer.normalizedDisplayToWorld(
normalizedRightDisplay[0],
normalizedRightDisplay[1],
normalizedRightDisplay[2],
aspect
);
for (let i = 0; i < 3; i++) {
tolerance +=
(windowUpperRight[i] - windowLowerLeft[i]) *
(windowUpperRight[i] - windowLowerLeft[i]);
}
return Math.sqrt(tolerance);
}
/**
* Perform picking on the given renderer, given a ray defined in world coordinates.
* @param {*} renderer
* @param {*} tolerance
* @param {*} p1World
* @param {*} p2World
* @returns true if we picked something else false
*/
function pick3DInternal(renderer, tolerance, p1World, p2World) {
const p1Mapper = new Float64Array(4);
const p2Mapper = new Float64Array(4);
const ray = [];
const hitPosition = [];
const props = model.pickFromList ? model.pickList : renderer.getActors();
// pre-allocate some arrays.
const transformScale = new Float64Array(3);
const pickedPosition = new Float64Array(3);
// Loop over props.
// Transform ray (defined from position of camera to selection point) into coordinates of mapper (not
// transformed to actors coordinates! Reduces overall computation!!!).
// Note that only vtkProp3D's can be picked by vtkPicker.
props.forEach((prop) => {
const mapper = prop.getMapper();
const propIsFullyTranslucent =
prop.getProperty?.().getOpacity?.() === 0.0;
const pickable =
prop.getNestedPickable() &&
prop.getNestedVisibility() &&
!propIsFullyTranslucent;
if (!pickable) {
// prop cannot be picked
return;
}
// The prop is candidate for picking:
// - get its composite matrix and invert it
// - use the inverted matrix to transform the ray points into mapper coordinates
model.transformMatrix = prop.getMatrix().slice(0);
mat4.transpose(model.transformMatrix, model.transformMatrix);
mat4.invert(model.transformMatrix, model.transformMatrix);
vec4.transformMat4(p1Mapper, p1World, model.transformMatrix);
vec4.transformMat4(p2Mapper, p2World, model.transformMatrix);
vec3.scale(p1Mapper, p1Mapper, 1 / p1Mapper[3]);
vec3.scale(p2Mapper, p2Mapper, 1 / p2Mapper[3]);
vtkMath.subtract(p2Mapper, p1Mapper, ray);
// We now have the ray endpoints in mapper coordinates.
// Compare it with the mapper bounds to check if intersection is possible.
// Get the bounding box of the mapper.
// Note that the tolerance is added to the bounding box to make sure things on the edge of the
// bounding box are picked correctly.
const bounds = mapper
? vtkBoundingBox.inflate(mapper.getBounds(), tolerance)
: [...vtkBoundingBox.INIT_BOUNDS];
if (vtkBoundingBox.intersectBox(bounds, p1Mapper, ray, hitPosition, [])) {
mat4.getScaling(transformScale, model.transformMatrix);
const t = model.intersectWithLine(
p1Mapper,
p2Mapper,
tolerance *
0.333 *
(transformScale[0] + transformScale[1] + transformScale[2]),
prop,
mapper
);
if (t < Number.MAX_VALUE) {
pickedPosition[0] = (1.0 - t) * p1World[0] + t * p2World[0];
pickedPosition[1] = (1.0 - t) * p1World[1] + t * p2World[1];
pickedPosition[2] = (1.0 - t) * p1World[2] + t * p2World[2];
const actorIndex = model.actors.indexOf(prop);
Iif (actorIndex !== -1) {
// If already in list, compare the previous picked position with the new one.
// Store the new one if it is closer from the ray endpoint.
const previousPickedPosition = model.pickedPositions[actorIndex];
if (
vtkMath.distance2BetweenPoints(p1World, pickedPosition) <
vtkMath.distance2BetweenPoints(p1World, previousPickedPosition)
) {
model.pickedPositions[actorIndex] = pickedPosition.slice(0);
}
} else {
model.actors.push(prop);
model.pickedPositions.push(pickedPosition.slice(0));
}
}
}
});
// sort array by distance
const tempArray = [];
for (let i = 0; i < model.pickedPositions.length; i++) {
tempArray.push({
actor: model.actors[i],
pickedPosition: model.pickedPositions[i],
distance2: vtkMath.distance2BetweenPoints(
p1World,
model.pickedPositions[i]
),
});
}
tempArray.sort((a, b) => {
const keyA = a.distance2;
const keyB = b.distance2;
// order the actors based on the distance2 attribute, so the near actors comes
// first in the list
Iif (keyA < keyB) return -1;
Iif (keyA > keyB) return 1;
return 0;
});
model.pickedPositions = [];
model.actors = [];
tempArray.forEach((obj) => {
model.pickedPositions.push(obj.pickedPosition);
model.actors.push(obj.actor);
});
}
// Intersect data with specified ray.
// Project the center point of the mapper onto the ray and determine its parametric value
model.intersectWithLine = (p1, p2, tolerance, prop, mapper) => {
Iif (!mapper) {
return Number.MAX_VALUE;
}
const center = mapper.getCenter();
const ray = vec3.subtract(new Float64Array(3), p2, p1);
const rayFactor = vtkMath.dot(ray, ray);
Iif (rayFactor === 0.0) {
return 2.0;
}
// Project the center point onto the ray and determine its parametric value
const t =
(ray[0] * (center[0] - p1[0]) +
ray[1] * (center[1] - p1[1]) +
ray[2] * (center[2] - p1[2])) /
rayFactor;
return t;
};
// To be overridden in subclasses
publicAPI.pick = (selection, renderer) => {
Iif (selection.length !== 3) {
vtkWarningMacro('vtkPicker.pick - selection needs three components');
}
Iif (!renderer) {
vtkErrorMacro('vtkPicker.pick - renderer cannot be null');
throw new Error('renderer cannot be null');
}
initialize();
const selectionX = selection[0];
const selectionY = selection[1];
let selectionZ = selection[2];
model.renderer = renderer;
model.selectionPoint[0] = selectionX;
model.selectionPoint[1] = selectionY;
model.selectionPoint[2] = selectionZ;
const p1World = new Float64Array(4);
const p2World = new Float64Array(4);
// Get camera focal point and position. Convert to display (screen)
// coordinates. We need a depth value for z-buffer.
const camera = renderer.getActiveCamera();
const cameraPos = camera.getPosition();
const cameraFP = camera.getFocalPoint();
const view = renderer.getRenderWindow().getViews()[0];
const dims = view.getViewportSize(renderer);
Iif (dims[1] === 0) {
vtkWarningMacro('vtkPicker.pick - viewport area is 0');
return;
}
const aspect = dims[0] / dims[1];
let displayCoords = [];
displayCoords = renderer.worldToNormalizedDisplay(
cameraFP[0],
cameraFP[1],
cameraFP[2],
aspect
);
displayCoords = view.normalizedDisplayToDisplay(
displayCoords[0],
displayCoords[1],
displayCoords[2]
);
selectionZ = displayCoords[2];
// Convert the selection point into world coordinates.
const normalizedDisplay = view.displayToNormalizedDisplay(
selectionX,
selectionY,
selectionZ
);
const worldCoords = renderer.normalizedDisplayToWorld(
normalizedDisplay[0],
normalizedDisplay[1],
normalizedDisplay[2],
aspect
);
for (let i = 0; i < 3; i++) {
model.pickPosition[i] = worldCoords[i];
}
// Compute the ray endpoints. The ray is along the line running from
// the camera position to the selection point, starting where this line
// intersects the front clipping plane, and terminating where this
// line intersects the back clipping plane.
const ray = [];
for (let i = 0; i < 3; i++) {
ray[i] = model.pickPosition[i] - cameraPos[i];
}
const cameraDOP = [];
for (let i = 0; i < 3; i++) {
cameraDOP[i] = cameraFP[i] - cameraPos[i];
}
vtkMath.normalize(cameraDOP);
const rayLength = vtkMath.dot(cameraDOP, ray);
Iif (rayLength === 0.0) {
vtkWarningMacro('Picker::Pick Cannot process points');
return;
}
const clipRange = camera.getClippingRange();
let tF;
let tB;
Iif (camera.getParallelProjection()) {
tF = clipRange[0] - rayLength;
tB = clipRange[1] - rayLength;
for (let i = 0; i < 3; i++) {
p1World[i] = model.pickPosition[i] + tF * cameraDOP[i];
p2World[i] = model.pickPosition[i] + tB * cameraDOP[i];
}
} else {
tF = clipRange[0] / rayLength;
tB = clipRange[1] / rayLength;
for (let i = 0; i < 3; i++) {
p1World[i] = cameraPos[i] + tF * ray[i];
p2World[i] = cameraPos[i] + tB * ray[i];
}
}
p1World[3] = 1.0;
p2World[3] = 1.0;
const tolerance =
computeTolerance(selectionZ, aspect, renderer) * model.tolerance;
pick3DInternal(model.renderer, tolerance, p1World, p2World);
};
publicAPI.pick3DPoint = (selectionPoint, focalPoint, renderer) => {
Iif (!renderer) {
throw new Error('renderer cannot be null');
}
initialize();
model.renderer = renderer;
vec3.copy(model.selectionPoint, selectionPoint);
const view = renderer.getRenderWindow().getViews()[0];
const dims = view.getViewportSize(renderer);
Iif (dims[1] === 0) {
vtkWarningMacro('vtkPicker.pick3DPoint - viewport area is 0');
return;
}
const aspect = dims[0] / dims[1];
const tolerance =
computeTolerance(model.selectionPoint[2], aspect, renderer) *
model.tolerance;
pick3DInternal(renderer, tolerance, selectionPoint, focalPoint);
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
tolerance: 0.025,
mapperPosition: [0.0, 0.0, 0.0],
mapper: null,
dataSet: null,
actors: [],
pickedPositions: [],
transformMatrix: null,
globalTMin: Number.MAX_VALUE,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Inheritance
vtkAbstractPicker.extend(publicAPI, model, initialValues);
macro.setGet(publicAPI, model, ['tolerance']);
macro.setGetArray(publicAPI, model, ['mapperPosition'], 3);
macro.get(publicAPI, model, [
'mapper',
'dataSet',
'actors',
'pickedPositions',
]);
macro.event(publicAPI, model, 'pickChange');
vtkPicker(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkPicker');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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