Move anchor, point and transform to JS

support/point.js

@@ -0,0 +1,73 @@
+"use strict";
+
+const { z } = require("typo-geom");
+
+module.exports = class Point {
+	constructor(x, y, on, cubic) {
+		this.x = x;
+		this.y = y;
+		this.on = on;
+		this.cubic = cubic;
+	}
+	add(z2) {
+		return this.addScale(1, z2);
+	}
+	addScale(scale, z2) {
+		return new Point(this.x + scale * z2.x, this.y + scale * z2.y, this.on, this.cubic);
+	}
+	mix(scale, z2) {
+		return new Point(
+			this.x + scale * (z2.x - this.x),
+			this.y + scale * (z2.y - this.y),
+			this.on,
+			this.cubic
+		);
+	}
+	scale(t) {
+		return new Point(t * this.x, t * this.y, this.on, this.cubic);
+	}
+	round(d) {
+		return new Point(
+			Math.round(d * this.x) / d,
+			Math.round(d * this.y) / d,
+			this.on,
+			this.cubic
+		);
+	}
+
+	static from(z, on, cubic) {
+		return new Point(z.x || 0, z.y || 0, on, cubic);
+	}
+	static cornerFrom(z) {
+		return new Point(z.x || 0, z.y || 0, true, false);
+	}
+	static offFrom(z) {
+		return new Point(z.x || 0, z.y || 0, false, false);
+	}
+	static cubicOffFrom(z) {
+		return new Point(z.x || 0, z.y || 0, false, true);
+	}
+	static cornerFromXY(x, y) {
+		return new Point(x || 0, y || 0, true, false);
+	}
+	static offFromXY(x, y) {
+		return new Point(x || 0, y || 0, false, false);
+	}
+	static cubicOffFromXY(x, y) {
+		return new Point(x || 0, y || 0, false, true);
+	}
+	static transformed(tfm, z) {
+		return Point.transformedXY(tfm, z.x, z.y, z.on, z.cubic);
+	}
+	static transformedXY(tfm, x, y, on, cubic) {
+		return new Point(
+			x * tfm.xx + y * tfm.yx + tfm.x || 0,
+			x * tfm.xy + y * tfm.yy + tfm.y || 0,
+			on,
+			cubic
+		);
+	}
+	static translated(z, dx, dy) {
+		return new Point(z.x + dx || 0, z.y + dy || 0, z.on, z.cubic);
+	}
+};