function PixiRenderer(element, stroke) {
      var _this;
      _this = _BaseRenderer.call(this, element) || this;
      _this.stroke = stroke;
      _this.color = false;
      _this.setColor = false;
      _this.blendMode = null;
      _this.pool.create = function (body, particle) {
        return _this.createBody(body, particle);
      };
      _this.setPIXI(window.PIXI);
      _this.name = "PixiRenderer";
      return _this;
    }
Creates a new PixiRenderer instance.
@param {PIXI.Container} element - The PIXI container to render to.
@param {string|number} [stroke] - The stroke color for particles.