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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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69
src/path.js
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@ -2,7 +2,13 @@ import Attributes from "./attributes";
import Point from "./point";
import Bezier from "bezier-js";
import { round } from "./round";
import { linesCross, curveCrossesLine, curveCrossesCurve } from "./utils";
import {
linesCross,
curveCrossesLine,
curveCrossesCurve,
pointOnLine,
pointOnCurve
} from "./utils";
function Path() {
this.render = true;
@ -655,4 +661,65 @@ function addIntersectionsToArray(candidates, intersections) {
}
}
/** Splits path on point, and retuns both halves */
Path.prototype.split = function(point) {
let divided = this.divide();
let firstHalf = false;
let secondHalf = false;
for (let pi in divided) {
let path = divided[pi];
if (path.ops[1].type === "line") {
if (pointOnLine(path.ops[0].to, path.ops[1].to, point)) {
firstHalf = divided.slice(0, pi);
firstHalf.push(new Path().move(path.ops[0].to).line(point));
pi++;
secondHalf = divided.slice(pi);
secondHalf.unshift(new Path().move(point).line(path.ops[1].to));
}
} else if (path.ops[1].type === "curve") {
let t = pointOnCurve(
path.ops[0].to,
path.ops[1].cp1,
path.ops[1].cp2,
path.ops[1].to,
point
);
if (t !== false) {
let curve = new Bezier(
{ x: path.ops[0].to.x, y: path.ops[0].to.y },
{ x: path.ops[1].cp1.x, y: path.ops[1].cp1.y },
{ x: path.ops[1].cp2.x, y: path.ops[1].cp2.y },
{ x: path.ops[1].to.x, y: path.ops[1].to.y }
);
let split = curve.split(t);
firstHalf = divided.slice(0, pi);
firstHalf.push(
new Path()
.move(new Point(split.left.points[0].x, split.left.points[0].y))
.curve(
new Point(split.left.points[1].x, split.left.points[1].y),
new Point(split.left.points[2].x, split.left.points[2].y),
new Point(split.left.points[3].x, split.left.points[3].y)
)
);
pi++;
secondHalf = divided.slice(pi);
secondHalf.unshift(
new Path()
.move(new Point(split.right.points[0].x, split.right.points[0].y))
.curve(
new Point(split.right.points[1].x, split.right.points[1].y),
new Point(split.right.points[2].x, split.right.points[2].y),
new Point(split.right.points[3].x, split.right.points[3].y)
)
);
}
}
}
if (firstHalf) firstHalf = joinPaths(firstHalf);
if (secondHalf) secondHalf = joinPaths(secondHalf);
return [firstHalf, secondHalf];
};
export default Path;