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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 53 54 55 56 57 58 59 60 61 62 | 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 14x 14x 14x 14x 14x 14x 14x 14x 14x 21x 21x | import type { Types } from '@cornerstonejs/core';
import { vec2, vec3 } from 'gl-matrix';
type Line2D = [Types.Point2, Types.Point2];
type Line3D = [Types.Point3, Types.Point3];
type Line = Line2D | Line3D;
/**
* Calculates the angle between two 3D lines.
*/
function angleBetween3DLines(line1: Line3D, line2: Line3D): number {
const [p1, p2] = line1;
const [p3, p4] = line2;
const v1 = vec3.sub(vec3.create(), p2, p1);
const v2 = vec3.sub(vec3.create(), p3, p4);
const dot = vec3.dot(v1, v2);
const v1Length = vec3.length(v1);
const v2Length = vec3.length(v2);
const cos = dot / (v1Length * v2Length);
const radian = Math.acos(cos);
return (radian * 180) / Math.PI;
}
/**
* Calculates the angle between two 2D lines.
*/
function angleBetween2DLines(line1: Line2D, line2: Line2D): number {
const [p1, p2] = line1;
const [p3, p4] = line2;
const v1 = vec2.sub(vec2.create(), p2, p1);
const v2 = vec2.sub(vec2.create(), p3, p4);
const dot = vec2.dot(v1, v2);
const v1Length = vec2.length(v1);
const v2Length = vec2.length(v2);
const cos = dot / (v1Length * v2Length);
return Math.acos(cos) * (180 / Math.PI);
}
/**
* Returns the angle between two lines in degrees.
* The angle measured is that between the vectors
* line1[1]->line1[0] AND line2[0]->line2[1].
* @param line1 - Line = [p1, p2]
* @param line2 - Line = [p3, p4]
* @returns The angle between two lines in degrees.
*/
export default function angleBetweenLines(line1: Line, line2: Line): number {
const is3D = line1[0].length === 3;
return is3D
? angleBetween3DLines(line1 as Line3D, line2 as Line3D)
: angleBetween2DLines(line1 as Line2D, line2 as Line2D);
}
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