Initial work of ESM transformation

font-src/support/geometry/point.mjs

@@ -0,0 +1,67 @@
+class Point {
+	constructor(type, x, y) {
+		this.type = type;
+		this.x = x;
+		this.y = y;
+	}
+	get on() {
+		throw new Error("Unreachable");
+	}
+	get cubic() {
+		throw new Error("Unreachable");
+	}
+	add(z2) {
+		return this.addScale(1, z2);
+	}
+	addScale(scale, z2) {
+		return new Point(this.type, this.x + scale * z2.x, this.y + scale * z2.y);
+	}
+	mix(scale, z2) {
+		return new Point(
+			this.type,
+			this.x + scale * (z2.x - this.x),
+			this.y + scale * (z2.y - this.y)
+		);
+	}
+	scale(t) {
+		return new Point(this.type, t * this.x, t * this.y);
+	}
+	round(d) {
+		return new Point(this.type, Math.round(d * this.x) / d, Math.round(d * this.y) / d);
+	}
+	static from(type, z) {
+		return new Point(type, z.x || 0, z.y || 0);
+	}
+	static fromXY(type, x, y) {
+		return new Point(type, x || 0, y || 0);
+	}
+	static corner(x, y) {
+		return new Point(Point.Type.Corner, x || 0, y || 0);
+	}
+	static withX(z, x) {
+		return new Point(z.type, x || 0, z.y);
+	}
+	static withY(z, y) {
+		return new Point(z.type, z.x, y || 0);
+	}
+	static transformed(tfm, z) {
+		return Point.transformedXY(tfm, z.type, z.x, z.y);
+	}
+	static transformedXY(tfm, type, x, y) {
+		return new Point(
+			type,
+			x * tfm.xx + y * tfm.yx + tfm.x || 0,
+			x * tfm.xy + y * tfm.yy + tfm.y || 0
+		);
+	}
+	static translated(z, dx, dy) {
+		return new Point(z.type, z.x + dx || 0, z.y + dy || 0);
+	}
+}
+Point.Type = {
+	Corner: 0,
+	CubicStart: 1,
+	CubicEnd: 2,
+	Quadratic: 3
+};
+export { Point };