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import type { vtkImageData } from '@kitware/vtk.js/Common/DataModel/ImageData';
import type BoundsIJK from '../types/BoundsIJK';
import type { CPUImageData, Point3 } from '../types';
import { createPositionCallback } from './createPositionCallback';
export type PointInShape = {
value: number;
index: number;
pointIJK: vec3;
pointLPS: vec3 | number[];
};
export type PointInShapeCallback = ({
value,
index,
pointIJK,
pointLPS,
}: {
value: number;
index: number;
pointIJK: Point3;
pointLPS: Point3;
}) => void;
export type ShapeFnCriteria = (pointLPS: vec3, pointIJK: vec3) => boolean;
/**
* Options for the pointInShapeCallback function.
*/
export interface PointInShapeOptions {
/** Function to determine if a point is inside the shape */
pointInShapeFn: ShapeFnCriteria;
/** Callback function for each point in the shape */
callback?: PointInShapeCallback;
/** Bounds of the volume in IJK coordinates */
boundsIJK?: BoundsIJK;
/** Whether to return the set of points in the shape */
returnPoints?: boolean;
// Add other options here for future optimizations
// For example:
// orthogonalVector?: vec3;
// basisPoints?: { min: Point3, max: Point3 };
// minMaxGenerator?: (row: number) => { min: number, max: number };
}
/**
* For each point in the image (If boundsIJK is not provided, otherwise, for each
* point in the provided bounding box), It runs the provided callback IF the point
* passes the provided criteria to be inside the shape (which is defined by the
* provided pointInShapeFn)
*
* You must record points in the callback function if you wish to have an array
* of the called points.
*
* @param imageData - The image data object.
* @param dimensions - The dimensions of the image.
* @param pointInShapeFn - A function that takes a point in LPS space and returns
* true if the point is in the shape and false if it is not.
* @param callback - A function that will be called for
* every point in the shape.
* @param boundsIJK - The bounds of the volume in IJK coordinates.
*/
export function pointInShapeCallback(
imageData: vtkImageData | CPUImageData,
options: PointInShapeOptions
): Array<PointInShape> | undefined {
const { pointInShapeFn, callback, boundsIJK, returnPoints = false } = options;
let scalarData;
// if getScalarData is a method on imageData
Iif ((imageData as CPUImageData).getScalarData) {
scalarData = (imageData as CPUImageData).getScalarData();
} else {
const scalars = (imageData as vtkImageData).getPointData().getScalars();
Iif (scalars) {
scalarData = scalars.getData();
} else {
// @ts-ignore
const { voxelManager } = imageData.get('voxelManager') || {};
Eif (voxelManager) {
scalarData = voxelManager.getCompleteScalarDataArray();
}
}
}
const dimensions = imageData.getDimensions();
const defaultBoundsIJK = [
[0, dimensions[0]],
[0, dimensions[1]],
[0, dimensions[2]],
];
const bounds = boundsIJK || defaultBoundsIJK;
const pointsInShape = iterateOverPointsInShape({
imageData,
bounds,
scalarData,
pointInShapeFn,
callback,
});
return returnPoints ? pointsInShape : undefined;
}
export function iterateOverPointsInShape({
imageData,
bounds,
scalarData,
pointInShapeFn,
callback,
}) {
const [[iMin, iMax], [jMin, jMax], [kMin, kMax]] = bounds;
const { numComps } = imageData as { numComps: number };
const dimensions = imageData.getDimensions();
const indexToWorld = createPositionCallback(imageData);
const pointIJK = [0, 0, 0] as Point3;
const xMultiple =
numComps ||
scalarData.length / dimensions[2] / dimensions[1] / dimensions[0];
const yMultiple = dimensions[0] * xMultiple;
const zMultiple = dimensions[1] * yMultiple;
const pointsInShape: Array<PointInShape> = [];
for (let k = kMin; k <= kMax; k++) {
pointIJK[2] = k;
const indexK = k * zMultiple;
for (let j = jMin; j <= jMax; j++) {
pointIJK[1] = j;
const indexJK = indexK + j * yMultiple;
for (let i = iMin; i <= iMax; i++) {
pointIJK[0] = i;
const pointLPS = indexToWorld(pointIJK);
// The current world position (pointLPS) is now in currentPos
if (pointInShapeFn(pointLPS, pointIJK)) {
const index = indexJK + i * xMultiple;
let value;
Iif (xMultiple > 2) {
value = [
scalarData[index],
scalarData[index + 1],
scalarData[index + 2],
];
} else {
value = scalarData[index];
}
pointsInShape.push({
value,
index,
pointIJK,
pointLPS: pointLPS.slice(),
});
callback({ value, index, pointIJK, pointLPS });
}
}
}
}
return pointsInShape;
}
export function iterateOverPointsInShapeVoxelManager({
voxelManager,
bounds,
imageData,
pointInShapeFn,
callback,
returnPoints,
}) {
const [[iMin, iMax], [jMin, jMax], [kMin, kMax]] = bounds;
const indexToWorld = createPositionCallback(imageData);
const pointIJK = [0, 0, 0] as Point3;
const pointsInShape: Array<PointInShape> = [];
for (let k = kMin; k <= kMax; k++) {
pointIJK[2] = k;
for (let j = jMin; j <= jMax; j++) {
pointIJK[1] = j;
for (let i = iMin; i <= iMax; i++) {
pointIJK[0] = i;
const pointLPS = indexToWorld(pointIJK);
if (pointInShapeFn(pointLPS, pointIJK)) {
const index = voxelManager.toIndex(pointIJK);
const value = voxelManager.getAtIndex(index);
Iif (returnPoints) {
pointsInShape.push({
value,
index,
pointIJK: [...pointIJK],
pointLPS: pointLPS.slice(),
});
}
callback?.({ value, index, pointIJK, pointLPS });
}
}
}
}
return pointsInShape;
}
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