40 wiersze
885 B
TypeScript
40 wiersze
885 B
TypeScript
import { Point } from "../vendor/bezier-js";
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/** Return the "reverse" of the given point/vector, i.e. scale it by -1. */
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export function reversePoint(p: Point): Point {
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return { x: -p.x, y: -p.y };
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}
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export function scalePointXY(p: Point, xScale: number, yScale: number): Point {
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return {
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x: p.x * xScale,
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y: p.y * yScale,
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};
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}
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export function subtractPoints(p1: Point, p2: Point): Point {
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return {
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x: p1.x - p2.x,
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y: p1.y - p2.y,
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};
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}
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export function normalizePoint(p: Point): Point {
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const len = Math.sqrt(Math.pow(p.x, 2) + Math.pow(p.y, 2));
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if (len === 0) {
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throw new Error(`Unable to normalize point with length 0`);
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}
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return {
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x: p.x / len,
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y: p.y / len,
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};
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}
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export function normalizedPoint2rad(p: Point): number {
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let result = Math.acos(p.x);
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if (p.y < 0) {
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result += (Math.PI - result) * 2;
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}
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return result;
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}
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