import java.awt.Graphics;
import java.awt.Color;
import java.lang.Integer;

// <APPLET CODE="BouncingBoxes.class" WIDTH=400 HEIGHT=400>
// <PARAM NAME=num_of_boxes VALUE=10>
// <PARAM NAME=min_diam VALUE=10>
// <PARAM NAME=max_diam VALUE=80>
// <PARAM NAME=min_speed VALUE=1>
// <PARAM NAME=max_speed VALUE=4>
// </APPLET>
public class BouncingBoxes extends DoubleBuf {

    // constants
    // the number of milliseconds between
    // screen redraws
    final static int REFRESH_DELAY = 20;

    // defaults changable via param interface
    static int NUM_OF_BOXES = 1;
    static int MIN_DIAM  = 20;
    static int MAX_DIAM  = 60;
    static int MIN_SPEED = 1;
    static int MAX_SPEED = 4;

    BoxSprite b[];

    public void start() {

	NUM_OF_BOXES = Integer.parseInt(getParameter("num_of_boxes"));
	MIN_DIAM     = Integer.parseInt(getParameter("min_diam"    ));
	MAX_DIAM     = Integer.parseInt(getParameter("max_diam"    ));
	MIN_SPEED    = Integer.parseInt(getParameter("min_speed"   ));
	MAX_SPEED    = Integer.parseInt(getParameter("max_speed"   ));

	int appwidth  = this.getSize().width;
	int appheight = this.getSize().height;
	int diam; // we use this to make sure they're square
	b = new BoxSprite[NUM_OF_BOXES];
	for (int i = 0; i < NUM_OF_BOXES; ++i) {
	    diam = randi(MIN_DIAM,MAX_DIAM);
	    b[i] = new BoxSprite(
 		// x,y pos
		randi(0,appwidth), randi(0,appheight),
		// x,y vel
		randi(MIN_SPEED,MAX_SPEED),randi(MIN_SPEED,MAX_SPEED),
	        // x,y dim
		//randi(MIN_DIAM,MAX_DIAM),randi(MIN_DIAM,MAX_DIAM),
		diam,diam,
		randcolor(),
		this
	    );
	    b[i].is_filled = false; //randbool();
	    b[i].has_motion_blur = false; //randbool();
	}
    }

    public void paint(Graphics g) {

	for (int i = 0; i < NUM_OF_BOXES; ++i) {
	    b[i].update();
	    b[i].paint(g);
	}
	repaint(REFRESH_DELAY);

    }

    public boolean randbool() {
	if ((int)(Math.random() * 2) == 1) {
	    return true;
	} else {
	    return false;
	}
    }

    public int randi(int low, int high) {
        return (int)((Math.random() * (high - low)) + low);
    }

    public Color randcolor() {
        Color color;
        int r = (int)(Math.random() * 6);
        switch (r) {
            case 0:
                color = Color.red;
                break;
            case 1:
                color = Color.magenta;
                break;
            case 2:
                color = Color.blue;
                break;
            case 3:
                color = Color.cyan;
                break;
            case 4:
                color = Color.green;
                break;
            default:
                color = Color.yellow;
                break;
        }
        return color;
    }


}