import java.awt.*;

public class StoneFieldView extends Canvas {
  int x, y;
  double part = 1.0;
  
  public StoneFieldView(int x, int y) {
    super();
    this.x = x; this.y = y;
  }
  
  protected final StoneView parentView() {
    return (StoneView) getParent();
  }
  
  public void update(Graphics g) {
    if (part >= 1.0) setBackground(Color.black);
    else {
      int side = parentView().getModel().getSum(x, y);
      if (side < 0) setBackground(new Color(64, 0, 0));
      if (side > 0) setBackground(new Color(0, 0, 64));
    }
    super.update(g);
  }
  
  protected final Color getShade(int i, int side) {
    int c = 127 / shades * i + 128;
    if (side < 0) return new Color(c, 0, 0);
    if (side > 0) return new Color(0, 0, c);
    return new Color(c, c, c);
  }		
  
  public void paint(Graphics g) {
    int cx = bounds().width / 2;
    int cy = bounds().height / 2;
    int step = (int) (Math.min(cx, cy) / shades / 3 * part);
    for (int i = 0; i < shades; i++) {
      g.setColor(getShade(i, parentView().getModel().getSum(x, y)));
      int t = (shades - i) * step;
      if (parentView().getModel().isRockOn(x, y))
	g.fillOval(cx - t * 2, cy - t * 2, t * 4, t * 4);
      else
	g.fillRect(cx - t, cy - t, t * 2, t * 2);
    };    
    if (part < 1.0) {
      part += 0.25;
      repaint(50);
    };
  }
  
  public int getX() { return x; }
  
  public int getY() { return y; }
  
  public void dirty(boolean boom) {
    if (boom) part = 0.25;
    repaint(200);
  }
  
  public Dimension preferredSize() {
    return new Dimension(30, 30);
  }
  
  public Dimension minimumSize() {
    return new Dimension(10, 10);
  }
  
  static final int shades = 3;
}