import java.awt.*;
import java.awt.image.*;
import java.net.*;

public class Palette extends Panel {
  Image offimage, colors;
  Graphics offgraphics;
  Dimension offdimension;

  Scratchpad sp;

  public Palette(Scratchpad sp, String palettefilename){
    this.sp = sp;
    repaint();

    try{
      Toolkit tk;
      tk = Toolkit.getDefaultToolkit();
      colors = tk.getImage(new URL(palettefilename));
    }
    catch (Exception e){
      System.out.println(e);
    }
  }

  public void paint(Graphics g) {

    Dimension d = size();

    if ((offgraphics == null) ||
	(offdimension.width != d.width) ||
	(offdimension.height != d.height)) {
    
      offimage = createImage(d.width, d.height);
      offgraphics = offimage.getGraphics();
      offdimension = d;
      System.out.println("initialized Palette");
    }

    offgraphics.drawImage(colors, 0, 0, d.width, d.height, this);
    g.drawImage(offimage, 0, 0, this);
  }

  public void update(Graphics g){  
    paint(g);
  }


  public boolean mouseUp(Event e, int x, int y) {
    //    System.out.println("Mouse Up: "+x+" "+y);
    if ((0 < x ) &&
	(x < offdimension.width) &&
	(0 < y ) &&
	(y < offdimension.height)) {

      int [] pixelbuffer = new int[1];
      PixelGrabber pg = new PixelGrabber(offimage, x, y, 1, 1,
					 pixelbuffer, 0, 1);
      try{
	pg.grabPixels();
      }
      catch (Exception p){
	System.out.println(p);
      }
      sp.setColor(pixelbuffer[0]);
      
    }
    

    return true;
  }
  
}