Method camera

src/main/java/fieldbox/boxes/FLineDrawing.java:155–173

(Supplier<FLine> wrap, Camera camera, Vec2 scale, Vec2 center)

	static public Supplier<FLine> camera(Supplier<FLine> wrap, Camera camera, Vec2 scale, Vec2 center) {
		Mat4 p = camera.projectionMatrix(0);
		Mat4 v = camera.view();

		return new Cached<Camera, Object, FLine>((c, was) -> {
			Mat4 o = Mat4.mul(p, v, new Mat4());
			o.transpose();
			return wrap.get()
				.byTransforming(x -> {
					Vec3 q = Mat4.transform(o, x, new Vec3());
					q.x *= scale.x;
					q.y *= scale.y;
					q.x += center.x;
					q.y += center.y;
					q.z = 0;
					return q;
				});
		}, (c) -> new Pair<>(camera, camera.getState())).toSupplier(() -> camera);
	}

	static public Function<Box, FLine> expires(Function<Box, FLine> wrap, int updates) {
		int[] counter = {updates};