phaser/Phaser/math/TransformUtils.ts

/// <reference path="../Game.ts" />
/// <reference path="Vec2.ts" />
/// <reference path="Transform.ts" />

/**
* Phaser - TransformUtils
*
* A collection of methods useful for manipulating and performing operations on 2D Transforms.
*
*/

module Phaser {

    export class TransformUtils {

        public static rotate(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
            return out.setTo(v.x * t.c - v.y * t.s, v.x * t.s + v.y * t.c);
        }

        public static unrotate(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
            return out.setTo(v.x * t.c + v.y * t.s, -v.x * t.s + v.y * t.c);
        }

        public static transform(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
            return out.setTo(v.x * t.c - v.y * t.s + t.t.x, v.x * t.s + v.y * t.c + t.t.y);
        }

        public static untransform(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {

            var px = v.x - t.t.x;
            var py = v.y - t.t.y;

            return out.setTo(px * t.c + py * t.s, -px * t.s + py * t.c);

        }

    }

}