while(j<down) {
        xSR = xS;
        ySR = yS;
        while(i<right) {
          xSRr = Math.round(xSR);
          ySRr = Math.round(ySR);
          color=getPixel(xSRr+xClip,ySRr+yClip);
          _context.target.drawPixel(color,_x+i,_y+j);
          xSR+=xcos;
          ySR+=xsin;
          i++;
        }
        xS-=ysin;
        yS+=ycos;
        i=left;
        j++;
      }