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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x | import { vec3 } from 'gl-matrix';
import type { Types } from '@cornerstonejs/core';
/**
* Given two world positions and an orthogonal view to an `imageVolume` defined by
* a `viewPlaneNormal` and a `viewUp`, get the width and height in world coordinates of the rectangle
* defined by the two points. The implementation works both with orthogonal
* non-orthogonal rectangles.
*
* @param viewPlaneNormal - The normal of the view.
* @param viewUp - The up direction of the view.
* @param imageVolume - The imageVolume to use to measure.
* @param worldPos1 - The first world position.
* @param worldPos2 - The second world position.
*
* @returns The `worldWidth` and `worldHeight`.
*/
export default function getWorldWidthAndHeightFromTwoPoints(
viewPlaneNormal: Types.Point3,
viewUp: Types.Point3,
worldPos1: Types.Point3,
worldPos2: Types.Point3
): { worldWidth: number; worldHeight: number } {
const viewRight = vec3.create();
vec3.cross(viewRight, <vec3>viewUp, <vec3>viewPlaneNormal);
const pos1 = vec3.fromValues(...worldPos1);
const pos2 = vec3.fromValues(...worldPos2);
const diagonal = vec3.create();
vec3.subtract(diagonal, pos1, pos2);
const diagonalLength = vec3.length(diagonal);
// When the two points are very close to each other return width as 0
// to avoid NaN the cosTheta formula calculation
Iif (diagonalLength < 0.0001) {
return { worldWidth: 0, worldHeight: 0 };
}
const cosTheta =
vec3.dot(diagonal, viewRight) / (diagonalLength * vec3.length(viewRight));
const sinTheta = Math.sqrt(1 - cosTheta * cosTheta);
const worldWidth = sinTheta * diagonalLength;
const worldHeight = cosTheta * diagonalLength;
return { worldWidth, worldHeight };
}
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