outerwalls.java

基于JAVA的跳球游戏

/*
 * OuterWalls.java
 *
 * Created on 2008年5月11日, 下午8:36
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package gizmos;
import java.awt.*;
import javax.imageio.*;
import java.io.*;
import gizmoball_demo.*;
/**
 *
 * @author ICE
 */
/**
 * The outer wall Gizmo.
 * <br>
 * Impermeable barriers surrounding the playfield.
 * <br>
 * Trigger: generated whenever the ball hits it
 * <br>
 * Action: none required
 * <br>
 * Coefficient of reflection: 1.0
 * <br>
 * <br>
 * <br>
 * A Gizmoball game supports exactly one set of outer walls. The user cannot 
 * move, delete, or rotate the outer walls. The outer walls lie just outside the
 * playing area:
 * <br>
 * <ul>
 * 	<li> There is one horizontal wall just above the y=0L coordinate. </li>
 * 	<li> There is one horizontal wall just below the y=20L coordinate. </li>
 * 	<li> There is one vertical wall just to the left of the x=0L coordinate. </li>
 * 	<li> There is one vertical wall just to the right of the x=20L coordinate. </li>
 * </ul>
 *
 * @specfield height : real		// Height of the gizmo (in world coordinates)
 * @specfield width : real		// Width of the gizmo (in world coordinates)
 * */
public class OuterWalls extends Gizmo{
    
    private static final double COEFF_REFLECTION = 1.0;
    private int x;
    private int y;
    private int width;
    private int height;
    /** Creates a new instance of OuterWalls */
    public OuterWalls() 
    {
        this.name="OuterWalls";
    }
    public int getX()
    {
        return x;
    }
    public int getY()
    {
        return y;
    }
    public void setPosition(int x,int y)
    {
        this.x=x;
        this.y=y;
    }
    //public boolean overSector(int sectorX,int sectorY){}
    //public boolean overlapsWith(Ball ball){}
    public void draw(java.awt.Graphics2D g)throws java.io.IOException
    {
        //java.net.URL imgURL = TriangleBumper.class.getResource("/gizmoball/src/image/wall.png");
        Image tbImage=ImageIO.read(new File("/gizmoball/src/image/wall.png"));
        g.drawImage(tbImage,x,y,null);
    }
    public void drawBB(java.awt.Graphics2D g,java.awt.Color c){}
    //public java.lang.Iterable<BoardSector> getSectors(){}
    //public double collisionTime(Ball ball){}
    public boolean collide(BouncingBall ball)
    {
        if (ball == null)
			throw new RuntimeException("Ball "+ball+" does not exist...");
			
		final double dx = ball.getX() - this.getX();
		final double dy = ball.getY() - this.getY();
		final double radius = ball.getRadius();

		if (dx < 0) { // left of gizmo
			if (dy < 0) { // top left of gizmo
				return dx*dx+dy*dy <= radius*radius;
			} else if (dy > height) { // bottom left of gizmo
				final double tmp = dy - height;
				return dx*dx+tmp*tmp <= radius*radius;
			} else { // left of gizmo
				return -dx <= radius;
			}
		} else if (dx > width) { // right of gizmo
			final double tmp = dx - width;
			if (dy < 0) { // top right of gizmo
				return tmp*tmp+dy*dy <= radius*radius;
			} else if (dy > height) { // bottom right of gizmo
				final double tmp2 = dy - height;
				return tmp*tmp+tmp2*tmp2 <= radius*radius;
			} else { // right of gizmo
				return tmp <= radius;
			}
                }
                return false;
    }
    //}
    //public org.w3c.dom.Element toXML(boolean compatible)
    //{
        
    //}
    
    
    
    
    
    
    
}