public class PixelMapping
{
    public ComplexImage complexImage;
    public PixelMapping next;
    public int ox,oy;
    public boolean allowDrag = true;
    
    boolean startAgain = false;
    
    public PixelMapping(ComplexImage ci, PixelMapping ne){complexImage=ci;next=ne;}

    public void setOrigin(int x,int y)
    {
        ox=x;oy=y;startAgain = true;
        if (next!=null) next.setOrigin(x,y);
    }
    public boolean morePixels()
        {
            //System.out.println("Pixelmapping: morePixels returns :"+startAgain);
            //return startAgain;
            if (next!=null)
            {
                return next.morePixels();
            }
            else
            {
                return startAgain;
            }
        }
    public PixelDesc nextPixel()
        {
            if (next==null)
            {                
                startAgain=false;
                PixelDesc pd = new PixelDesc();
                pd.x = ox;
                pd.y = oy;
                pd.amount = 1;
//                return (new PixelDesc(new PixelOp(),ox,oy,1));  // why doesnt this work??
                return(pd);
            } else
            {
                if (startAgain==true)
                {
                    startAgain=false;
                    next.setOrigin(ox,oy);
                    if (next.morePixels()) return next.nextPixel(); else return null;
                } else
                {
                    if (next.morePixels()) return next.nextPixel(); else return null;
                }                
            }
        }
}