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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | import { Types } from '@cornerstonejs/core'; import getSignedArea from './getSignedArea'; /** * Calculate the normal of a 2D polyline * https://www.youtube.com/watch?v=GpsKrAipXm8&t=1982s * * @param polyline - Planar polyline in 2D space * @returns Normal of the 2D planar polyline */ export default function getNormal2(polyline: Types.Point2[]): Types.Point3 { const area = getSignedArea(polyline); // The normal of a 2D polyline is (0, 0, 1) or (0, 0, -1) depending if it // is CW or CCW polyline return [0, 0, area / Math.abs(area)] as Types.Point3; } |