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✨ Added Path.split() and the utility methods that support it

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This commit is contained in:
Joost De Cock 2018-08-22 15:55:15 +02:00
parent 753c1e913f
commit a4647dfebb
4 changed files with 191 additions and 1 deletions
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38
src/utils.js
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@ -1,4 +1,5 @@
import Point from "./point";
import Path from "./path";
import Bezier from "bezier-js";
import { round } from "./round";
@ -51,6 +52,43 @@ export function linesCross(a1, a2, b1, b2) {
else return false;
}
/** Finds out whether a point lies on an endless line */
export function pointOnBeam(from, to, check) {
if (from.sitsOn(check)) return true;
if (to.sitsOn(check)) return true;
let angleA = from.angle(to);
let angleB = from.angle(check);
if (angleA === angleB || Math.abs(angleA - angleB) === 180) return true;
else return false;
}
/** Finds out whether a point lies on a line segment */
export function pointOnLine(from, to, check) {
if (!pointOnBeam(from, to, check)) return false;
let lenA = from.dist(to);
let lenB = from.dist(check) + check.dist(to);
if (Math.round(lenA) == Math.round(lenB)) return true;
else return false;
}
/** Finds out whether a point lies on a curve */
export function pointOnCurve(start, cp1, cp2, end, check) {
if (start.sitsOn(check)) return true;
if (end.sitsOn(check)) return true;
let curve = new Bezier(
{ x: start.x, y: start.y },
{ x: cp1.x, y: cp1.y },
{ x: cp2.x, y: cp2.y },
{ x: end.x, y: end.y }
);
let intersections = curve.intersects({
p1: { x: check.x - 1, y: check.y },
p2: { x: check.x + 1, y: check.y }
});
if (intersections.length > 0) return intersections.shift();
else return false;
}
/** Find where an (endless) line crosses a certain X-value */
export function beamCrossesX(from, to, x) {
if (from.x === to.x) return false; // Vertical line