Class Matrix

src/scripting/api/Display/Matrix.ts:76–151

   * 3x3 with 9 configurable values.
   */
  export class Matrix implements ISerializable {
    private _data:Array<number>;

    constructor(a:number = 1, b:number = 0, c:number = 0, d:number = 1, tx:number = 0, ty:number = 0) {
      this._data = [a, c, tx, b, d, ty, 0, 0, 1];
    }

    private dotProduct(o:Array<number>):Array<number> {
      if (o.length < 9) {
        throw new Error('Matrix dot product expects a 3x3 Matrix');
      }
      var res:Array<number> = [0, 0, 0, 0, 0, 0, 0, 0, 0];
      for (var i = 0; i < 3; i++) {
        for (var j = 0; j < 3; j++) {
          for (var k = 0; k < 3; k++) {
            res[i * 3 + j] += this._data[i * 3 + k] * o[k * 3 + j];
          }
        }
      }
      return res;
    }

    public setTo(a:number = 1, b:number = 0, c:number = 0, d:number = 1, tx:number = 0, ty:number = 0):void {
      this._data = [a, c, tx, b, d, ty, 0, 0, 1];
    }

    public translate(tX:number, tY:number):void {
      this._data[2] += tX;
      this._data[5] += tY;
    }

    public rotate(q:number):void {
      this._data = this.dotProduct([
        Math.cos(q), -Math.sin(q), 0,
        Math.sin(q), Math.cos(q), 0,
        0, 0, 1
      ]);
    }

    public scale(sx:number, sy:number):void {
      this._data = this.dotProduct([
        sx, 0, 0,
        0, sy, 0,
        0, 0, 1
      ]);
    }

    public identity():void {
      this.setTo(1, 0, 0, 1, 0, 0);
    }

    public createGradientBox(width:number, height:number, rotation:number, tX:number, tY:number):void {
      this.createBox(width, height, rotation, tX, tY);
    }

    public createBox(sX:number, sY:number, q:number, tX:number, tY:number):void {
      this.identity();
      this.rotate(q);