code: public void scale(double scaleX, double scaleY) {
  		this.m00 *= scaleX;
  		this.m11 *= scaleY;
  		this.m01 *= scaleY;
  		this.m10 *= scaleX;
  	}
docs: Concatenates this transform with a scaling transformation.
  
  <p>This function is equivalent to:
  <pre>
  this = this *  [   sx   0    0   ]
  [   0    sy   0   ]
  [   0    0    1   ]
  </pre>
  
  @param scaleX scaling along x axis.
  @param scaleY scaling along y axis.