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import vtkCellTypes from 'vtk.js/Sources/Common/DataModel/CellTypes';
import vtkLine from 'vtk.js/Sources/Common/DataModel/Line';
import vtkPicker from 'vtk.js/Sources/Rendering/Core/Picker';
import vtkPolyLine from 'vtk.js/Sources/Common/DataModel/PolyLine';
import vtkTriangle from 'vtk.js/Sources/Common/DataModel/Triangle';
import vtkQuad from 'vtk.js/Sources/Common/DataModel/Quad';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import { CellType } from 'vtk.js/Sources/Common/DataModel/CellTypes/Constants';
import { vec3, vec4 } from 'gl-matrix';
import vtkBox from 'vtk.js/Sources/Common/DataModel/Box';
// ----------------------------------------------------------------------------
// Global methods
// ----------------------------------------------------------------------------
function createCellMap() {
return {
[CellType.VTK_LINE]: vtkLine.newInstance(),
[CellType.VTK_POLY_LINE]: vtkPolyLine.newInstance(),
[CellType.VTK_TRIANGLE]: vtkTriangle.newInstance(),
[CellType.VTK_QUAD]: vtkQuad.newInstance(),
};
}
function clipLineWithPlane(mapper, matrix, p1, p2) {
const outObj = { planeId: -1, t1: 0.0, t2: 1.0, intersect: 0 };
const nbClippingPlanes = mapper.getNumberOfClippingPlanes();
const plane = [];
for (let i = 0; i < nbClippingPlanes; i++) {
mapper.getClippingPlaneInDataCoords(matrix, i, plane);
const d1 =
plane[0] * p1[0] + plane[1] * p1[1] + plane[2] * p1[2] + plane[3];
const d2 =
plane[0] * p2[0] + plane[1] * p2[1] + plane[2] * p2[2] + plane[3];
// If both distances are negative, both points are outside
if (d1 < 0 && d2 < 0) {
return 0;
}
if (d1 < 0 || d2 < 0) {
// If only one of the distances is negative, the line crosses the plane
// Compute fractional distance "t" of the crossing between p1 & p2
let t = 0.0;
// The "if" here just avoids an expensive division when possible
if (d1 !== 0) {
// We will never have d1==d2 since they have different signs
t = d1 / (d1 - d2);
}
// If point p1 was clipped, adjust t1
if (d1 < 0) {
if (t >= outObj.t1) {
outObj.t1 = t;
outObj.planeId = i;
}
} else if (t <= outObj.t2) {
// else point p2 was clipped, so adjust t2
outObj.t2 = t;
}
// If this happens, there's no line left
if (outObj.t1 > outObj.t2) {
outObj.intersect = 0;
return outObj;
}
}
}
outObj.intersect = 1;
return outObj;
}
// ----------------------------------------------------------------------------
// Static API
// ----------------------------------------------------------------------------
export const STATIC = {
clipLineWithPlane,
};
// ----------------------------------------------------------------------------
// vtkCellPicker methods
// ----------------------------------------------------------------------------
function vtkCellPicker(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkCellPicker');
const superClass = { ...publicAPI };
function resetCellPickerInfo() {
model.cellId = -1;
model.pCoords[0] = 0.0;
model.pCoords[1] = 0.0;
model.pCoords[2] = 0.0;
model.cellIJK[0] = 0.0;
model.cellIJK[1] = 0.0;
model.cellIJK[2] = 0.0;
model.mapperNormal[0] = 0.0;
model.mapperNormal[1] = 0.0;
model.mapperNormal[2] = 1.0;
model.pickNormal[0] = 0.0;
model.pickNormal[1] = 0.0;
model.pickNormal[2] = 1.0;
}
function resetPickInfo() {
model.dataSet = null;
model.mapper = null;
resetCellPickerInfo();
}
publicAPI.initialize = () => {
resetPickInfo();
superClass.initialize();
};
publicAPI.computeSurfaceNormal = (data, cell, weights, normal) => {
const normals = data.getPointData().getNormals();
// TODO add getCellDimension on vtkCell
const cellDimension = 0;
Iif (normals) {
normal[0] = 0.0;
normal[1] = 0.0;
normal[2] = 0.0;
const pointNormal = [];
for (let i = 0; i < 3; i++) {
normals.getTuple(cell.getPointsIds()[i], pointNormal);
normal[0] += pointNormal[0] * weights[i];
normal[1] += pointNormal[1] * weights[i];
normal[2] += pointNormal[2] * weights[i];
}
vtkMath.normalize(normal);
} else Iif (cellDimension === 2) {
// TODO
} else {
return 0;
}
return 1;
};
publicAPI.pick = (selection, renderer) => {
publicAPI.initialize();
const pickResult = superClass.pick(selection, renderer);
Iif (pickResult) {
const camera = renderer.getActiveCamera();
const cameraPos = [];
camera.getPosition(cameraPos);
if (camera.getParallelProjection()) {
// For parallel projection, use -ve direction of projection
const cameraFocus = [];
camera.getFocalPoint(cameraFocus);
model.pickNormal[0] = cameraPos[0] - cameraFocus[0];
model.pickNormal[1] = cameraPos[1] - cameraFocus[1];
model.pickNormal[2] = cameraPos[2] - cameraFocus[2];
} else {
// Get the vector from pick position to the camera
model.pickNormal[0] = cameraPos[0] - model.pickPosition[0];
model.pickNormal[1] = cameraPos[1] - model.pickPosition[1];
model.pickNormal[2] = cameraPos[2] - model.pickPosition[2];
}
vtkMath.normalize(model.pickNormal);
}
return pickResult;
};
model.intersectWithLine = (p1, p2, tolerance, prop, mapper) => {
let tMin = Number.MAX_VALUE;
let t1 = 0.0;
let t2 = 1.0;
const vtkCellPickerPlaneTol = 1e-14;
const clipLine = clipLineWithPlane(
mapper,
model.transformMatrix,
p1,
p2,
t1,
t2
);
Iif (mapper && !clipLine.intersect) {
return Number.MAX_VALUE;
}
if (mapper.isA('vtkImageMapper') || mapper.isA('vtkImageArrayMapper')) {
const pickData = mapper.intersectWithLineForCellPicking(p1, p2);
if (pickData) {
tMin = pickData.t;
model.cellIJK = pickData.ijk;
model.pCoords = pickData.pCoords;
}
} else Iif (mapper.isA('vtkVolumeMapper')) {
// we calculate here the parametric intercept points between the ray and the bounding box, so
// if the application defines for some reason a too large ray length (1e6), it restrict the calculation
// to the vtkVolume prop bounding box
const interceptionObject = vtkBox.intersectWithLine(
mapper.getBounds(),
p1,
p2
);
t1 =
interceptionObject?.t1 > clipLine.t1
? interceptionObject.t1
: clipLine.t1;
t2 =
interceptionObject?.t2 < clipLine.t2
? interceptionObject.t2
: clipLine.t2;
tMin = model.intersectVolumeWithLine(p1, p2, t1, t2, tolerance, prop);
} else if (mapper.isA('vtkMapper')) {
tMin = model.intersectActorWithLine(p1, p2, t1, t2, tolerance, mapper);
}
if (tMin < model.globalTMin) {
model.globalTMin = tMin;
Iif (
Math.abs(tMin - t1) < vtkCellPickerPlaneTol &&
clipLine.clippingPlaneId >= 0
) {
model.mapperPosition[0] = p1[0] * (1 - t1) + p2[0] * t1;
model.mapperPosition[1] = p1[1] * (1 - t1) + p2[1] * t1;
model.mapperPosition[2] = p1[2] * (1 - t1) + p2[2] * t1;
const plane = [];
mapper.getClippingPlaneInDataCoords(
model.transformMatrix,
clipLine.clippingPlaneId,
plane
);
vtkMath.normalize(plane);
// Want normal outward from the planes, not inward
model.mapperNormal[0] = -plane[0];
model.mapperNormal[1] = -plane[1];
model.mapperNormal[2] = -plane[2];
}
vec3.transformMat4(
model.pickPosition,
model.mapperPosition,
model.transformMatrix
);
// Transform vector
const mat = model.transformMatrix;
model.mapperNormal[0] =
mat[0] * model.pickNormal[0] +
mat[4] * model.pickNormal[1] +
mat[8] * model.pickNormal[2];
model.mapperNormal[1] =
mat[1] * model.pickNormal[0] +
mat[5] * model.pickNormal[1] +
mat[9] * model.pickNormal[2];
model.mapperNormal[2] =
mat[2] * model.pickNormal[0] +
mat[6] * model.pickNormal[1] +
mat[10] * model.pickNormal[2];
}
return tMin;
};
model.intersectVolumeWithLine = (p1, p2, t1, t2, tolerance, volume) => {
let tMin = Number.MAX_VALUE;
const mapper = volume.getMapper();
const imageData = mapper.getInputData();
const dims = imageData.getDimensions();
const scalars = imageData.getPointData().getScalars().getData();
const extent = imageData.getExtent();
// get the world to index transform to correctly transform from world to volume index
const imageTransform = imageData.getWorldToIndex();
// calculate opacity table
const numIComps = 1;
const oWidth = 1024;
const tmpTable = new Float32Array(oWidth);
const opacityArray = new Float32Array(oWidth);
let ofun;
let oRange;
const sampleDist = volume.getMapper().getSampleDistance();
for (let c = 0; c < numIComps; ++c) {
ofun = volume.getProperty().getScalarOpacity(c);
oRange = ofun.getRange();
ofun.getTable(oRange[0], oRange[1], oWidth, tmpTable, 1);
const opacityFactor =
sampleDist / volume.getProperty().getScalarOpacityUnitDistance(c);
// adjust for sample distance etc
for (let i = 0; i < oWidth; ++i) {
opacityArray[i] = 1.0 - (1.0 - tmpTable[i]) ** opacityFactor;
}
}
const scale = oWidth / (oRange[1] - oRange[0] + 1);
// Make a new p1 and p2 using the clipped t1 and t2
const q1 = [0, 0, 0, 1];
const q2 = [0, 0, 0, 1];
q1[0] = p1[0];
q1[1] = p1[1];
q1[2] = p1[2];
q2[0] = p2[0];
q2[1] = p2[1];
q2[2] = p2[2];
if (t1 !== 0.0 || t2 !== 1.0) {
for (let j = 0; j < 3; j++) {
q1[j] = p1[j] * (1.0 - t1) + p2[j] * t1;
q2[j] = p1[j] * (1.0 - t2) + p2[j] * t2;
}
}
// convert q1, q2 world coordinates to x1, x2 volume index coordinates
const x1 = [0, 0, 0, 0];
const x2 = [0, 0, 0, 0];
vec4.transformMat4(x1, q1, imageTransform);
vec4.transformMat4(x2, q2, imageTransform);
const x = [0, 0, 0];
const xi = [0, 0, 0];
const sliceSize = dims[1] * dims[0];
const rowSize = dims[0];
// here the step is the 1 over the distance between volume index location x1 and x2
const step = 1 / Math.sqrt(vtkMath.distance2BetweenPoints(x1, x2));
let insideVolume;
// here we reinterpret the t value as the distance between x1 and x2
// When calculating the tMin, we weight t between t1 and t2 values
for (let t = 0; t < 1; t += step) {
// calculate the location of the point
insideVolume = true;
for (let j = 0; j < 3; j++) {
// "t" is the fractional distance between endpoints x1 and x2
x[j] = x1[j] * (1.0 - t) + x2[j] * t;
}
for (let j = 0; j < 3; j++) {
// Bounds check
if (x[j] < extent[2 * j]) {
x[j] = extent[2 * j];
insideVolume = false;
} else if (x[j] > extent[2 * j + 1]) {
x[j] = extent[2 * j + 1];
insideVolume = false;
}
xi[j] = Math.round(x[j]);
}
if (insideVolume) {
const index = xi[2] * sliceSize + xi[1] * rowSize + xi[0];
let value = scalars[index];
if (value < oRange[0]) {
value = oRange[0];
} else if (value > oRange[1]) {
value = oRange[1];
}
value = Math.floor((value - oRange[0]) * scale);
const opacity = tmpTable[value];
if (opacity > model.opacityThreshold) {
// returning the tMin to the original scale, if t1 > 0 or t2 < 1
tMin = t1 * (1.0 - t) + t2 * t;
break;
}
}
}
return tMin;
};
model.intersectActorWithLine = (p1, p2, t1, t2, tolerance, mapper) => {
let tMin = Number.MAX_VALUE;
const minXYZ = [0, 0, 0];
let pDistMin = Number.MAX_VALUE;
const minPCoords = [0, 0, 0];
let minCellId = null;
let minCell = null;
let minCellType = null;
let subId = null;
const x = [];
const data = mapper.getInputData();
const isPolyData = 1;
// Make a new p1 and p2 using the clipped t1 and t2
const q1 = [0, 0, 0];
const q2 = [0, 0, 0];
q1[0] = p1[0];
q1[1] = p1[1];
q1[2] = p1[2];
q2[0] = p2[0];
q2[1] = p2[1];
q2[2] = p2[2];
Iif (t1 !== 0.0 || t2 !== 1.0) {
for (let j = 0; j < 3; j++) {
q1[j] = p1[j] * (1.0 - t1) + p2[j] * t1;
q2[j] = p1[j] * (1.0 - t2) + p2[j] * t2;
}
}
const locator = null;
Iif (locator) {
// TODO when cell locator will be implemented
} else if (data.getCells) {
if (!data.getCells()) {
data.buildLinks();
}
const tempCellMap = createCellMap();
const minCellMap = createCellMap();
const numberOfCells = data.getNumberOfCells();
/* eslint-disable no-continue */
for (let cellId = 0; cellId < numberOfCells; cellId++) {
const pCoords = [0, 0, 0];
minCellType = data.getCellType(cellId);
// Skip cells that are marked as empty
Iif (minCellType === CellType.VTK_EMPTY_CELL) {
continue;
}
const cell = tempCellMap[minCellType];
Iif (cell == null) {
continue;
}
minCell = minCellMap[minCellType];
data.getCell(cellId, cell);
let cellPicked;
if (isPolyData) {
Iif (vtkCellTypes.hasSubCells(minCellType)) {
cellPicked = cell.intersectWithLine(
t1,
t2,
p1,
p2,
tolerance,
x,
pCoords
);
} else {
cellPicked = cell.intersectWithLine(p1, p2, tolerance, x, pCoords);
}
} else E{
cellPicked = cell.intersectWithLine(q1, q2, tolerance, x, pCoords);
if (t1 !== 0.0 || t2 !== 1.0) {
cellPicked.t = t1 * (1.0 - cellPicked.t) + t2 * cellPicked.t;
}
}
if (
cellPicked.intersect === 1 &&
cellPicked.t <= tMin + model.tolerance &&
cellPicked.t >= t1 &&
cellPicked.t <= t2
) {
const pDist = cell.getParametricDistance(pCoords);
if (pDist < pDistMin || (pDist === pDistMin && cellPicked.t < tMin)) {
tMin = cellPicked.t;
pDistMin = pDist;
subId = cellPicked.subId;
minCellId = cellId;
cell.deepCopy(minCell);
for (let k = 0; k < 3; k++) {
minXYZ[k] = x[k];
minPCoords[k] = pCoords[k];
}
}
}
}
/* eslint-enable no-continue */
}
if (minCellId >= 0 && tMin < model.globalTMin) {
resetPickInfo();
const nbPointsInCell = minCell.getNumberOfPoints();
const weights = new Array(nbPointsInCell);
for (let i = 0; i < nbPointsInCell; i++) {
weights[i] = 0.0;
}
const point = [];
Iif (vtkCellTypes.hasSubCells(minCellType)) {
minCell.evaluateLocation(subId, minPCoords, point, weights);
} else {
minCell.evaluateLocation(minPCoords, point, weights);
}
// Return the polydata to the user
model.dataSet = data;
model.cellId = minCellId;
model.pCoords[0] = minPCoords[0];
model.pCoords[1] = minPCoords[1];
model.pCoords[2] = minPCoords[2];
// Find the point with the maximum weight
let maxWeight = 0;
let iMaxWeight = -1;
for (let i = 0; i < nbPointsInCell; i++) {
if (weights[i] > maxWeight) {
iMaxWeight = i;
maxWeight = weights[i];
}
}
// If maximum weight is found, use it to get the PointId
if (iMaxWeight !== -1) {
model.pointId = minCell.getPointsIds()[iMaxWeight];
}
// Set the mapper position
model.mapperPosition[0] = minXYZ[0];
model.mapperPosition[1] = minXYZ[1];
model.mapperPosition[2] = minXYZ[2];
// Compute the normal
if (
!publicAPI.computeSurfaceNormal(
data,
minCell,
weights,
model.mapperNormal
)
) {
// By default, the normal points back along view ray
model.mapperNormal[0] = p1[0] - p2[0];
model.mapperNormal[1] = p1[1] - p2[1];
model.mapperNormal[2] = p1[2] - p2[2];
vtkMath.normalize(model.mapperNormal);
}
}
return tMin;
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
cellId: -1,
pCoords: [],
cellIJK: [],
pickNormal: [],
mapperNormal: [],
opacityThreshold: 0.2,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Inheritance
vtkPicker.extend(publicAPI, model, initialValues);
macro.getArray(publicAPI, model, [
'pickNormal',
'mapperNormal',
'pCoords',
'cellIJK',
]);
macro.setGet(publicAPI, model, ['opacityThreshold']);
macro.get(publicAPI, model, ['cellId']);
// Object methods
vtkCellPicker(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkCellPicker');
// ----------------------------------------------------------------------------
export default { newInstance, extend, ...STATIC };
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