class LocationScalePixel extends PixelTransform{
    double location, scale;
  LocationScalePixel(double location, double scale){
    double sum = location + scale;
    if( sum > 1 ){
       System.err.println(
            "--- Error --- location (" + location
                      + ") scale (" + scale + ") > 1"
       );
       location /= sum;
       scale /= sum;
    };
    this.location = location;
    this.scale = scale;
  }
  int getPixel(int i, int j){
     return
        image.getRGB(
            ((int) (width*location)) + (i+width)%((int) (width*scale))
            ,
            ((int) (height*location)) + (j+height)%((int)(height*scale))
        );
  }
}