//
// This uses the 1.0 event model.
//
import java.applet.*;
import java.awt.*;

abstract class Drawings {

    abstract void render(Graphics g, int x, int y);

    static final int DRAW   = 0;
    static final int FILL   = 1;

    protected int random(double range) {
      return ((int) (Math.random() * range));
    }

    protected int random(int range) {
      return (random((double) range));
    }

    void pickColor(Graphics g) {
      int red = random(256);
      int green = random(256);
      int blue = random(256);
      Color color = new Color(red, green, blue);
      g.setColor(color);
    }
}

class Circles extends Drawings {

    private int circleType = DRAW;

    public Circles() {
      circleType = DRAW;
    }

    public Circles(int circleType) {
      this.circleType = circleType;
    }

    void render(Graphics g, int originX, int originY) {
      int iters = random(30)+2;
      int width = random(30)+2;

      for (int i = iters; i >= 0; --i) {
	pickColor(g);
	switch (this.circleType) {
	  case DRAW:
	    g.drawOval(originX-(i*width/2), originY-(i*width/2), i*width, i*width);
	    break;
	  case FILL:
	    g.fillOval(originX-(i*width/2), originY-(i*width/2), i*width, i*width);
	    break;
        }
      }
    }
}

class Boxes extends Drawings {

    private int boxType = DRAW;
    private boolean is3D = false;

    public Boxes() {
      boxType = DRAW;
      is3D = false;
    }

    public Boxes(int boxType, boolean is3D) {
      this.boxType = boxType;
      this.is3D = is3D;
    }

    void render(Graphics g, int originX, int originY) {
      int iters = random(30)+2;
      int width = random(30)+2;

      for (int i = iters; i >= 0; --i) {
	pickColor(g);
	switch (this.boxType) {
	  case DRAW:
	    if (is3D) {
	      g.draw3DRect(originX-(i*width/2), originY-(i*width/2), i*width, i*width, true);
	    }
	    else {
	      g.drawRect(originX-(i*width/2), originY-(i*width/2), i*width, i*width);
	    }
	    break;
	  case FILL:
	    if (is3D) {
	      g.fill3DRect(originX-(i*width/2), originY-(i*width/2), i*width, i*width, true);
	    }
	    else {
	      g.fillRect(originX-(i*width/2), originY-(i*width/2), i*width, i*width);
	    }
	    break;
        }
      }
    }
}

public class kScope extends java.applet.Applet {

// Globals.

    int originX = 256;
    int originY = 256;
    int toggleDisplay = 0;
    final int MAX_DISPLAY = 7;
    Circles drawCircle;
    Circles fillCircle;
    Boxes drawBox;
    Boxes draw3DBox;
    Boxes fillBox;
    Boxes fill3DBox;

// Methods.

    public void init() {
      System.out.println("init");
      drawCircle = new Circles(Circles.DRAW);
      fillCircle = new Circles(Circles.FILL);
      drawBox    = new Boxes(Boxes.DRAW, false);
      draw3DBox  = new Boxes(Boxes.DRAW, true);
      fillBox    = new Boxes(Boxes.FILL, false);
      fill3DBox  = new Boxes(Boxes.FILL, true);
    }

    public void start() {
      System.out.println("start");
    }

    public void stop() {
      System.out.println("stop");
    }

    public void destroy() {
      System.out.println("destroy");
      drawCircle = null;
      fillCircle = null;
      drawBox    = null;
      draw3DBox  = null;
      fillBox    = null;
      fill3DBox  = null;
    }

    public void paint(Graphics g) {

	String text;

	g.setColor(Color.black);
	g.fillRect(0, 0, 511, 511);

	text = "";	// prevent compiler whining
	switch (toggleDisplay) {
	  case 0: drawCircle.render(g, originX, originY); 
		  text = "Circles"; 
		  break;
	  case 1: fillCircle.render(g, originX, originY); 
		  text = "Filled Circles"; 
		  break;
	  case 2: drawBox.render(g, originX, originY);    
		  text = "Boxes"; 
		  break;
	  case 3: draw3DBox.render(g, originX, originY);  
		  text = "3D Boxes";
		  break;
	  case 4: fillBox.render(g, originX, originY); 
		  text = "Filled Boxes";
	          break;
	  case 5: fill3DBox.render(g, originX, originY); 
		  text = "Filled 3D Boxes";
		  break;
	  case 6:
	          drawCircle.render(g, originX, originY);
	          fillCircle.render(g, originX, originY);
	          drawBox.render(g, originX, originY);
	          draw3DBox.render(g, originX, originY);
	          fillBox.render(g, originX, originY);
	          fill3DBox.render(g, originX, originY);
		  text = "Kaleidescope!";
		  break;
        }
	g.setColor(Color.white);
	g.drawString("AWT version 1.0 event model", 32, 16);
	g.drawString(text, 32, 32);
    }

    public boolean mouseDown(java.awt.Event evt, int x, int y) {
	originX = x;
	originY = y;
	repaint();
	return true;
    }

     public boolean keyUp(Event evt, int key) {
	toggleDisplay = (toggleDisplay + 1) % MAX_DISPLAY;
	repaint();
	return true;
    }
}