code: public void setShift(double x, double y) {
  		xx = 1;
  		xy = 0;
  		xd = x;
  		yx = 0;
  		yy = 1;
  		yd = y;
  	}
docs: Set this transformation to be a shift.
  
  @param x
  The X coordinate to shift to.
  @param y
  The Y coordinate to shift to.