ball.java

自己写的一些桌球程序

package day03.table_ball;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;

/**
 * 小球类，代表在画布上移动的小球
 * @author Administrator
 *
 */
public class Ball{
	private double speetX=0.0;
	private double speetY=0.0;
	private double MOCHAX=0.02;
	private double MOCHAY=0.02;
	private Component canvas;//画布
	private Color color;//小球的颜色
	private int XSIZE = 25;//小球的X直径
	private int YSIZE = 25;//小球的Y直径
	private double bx=0;  //小球所处的座标  
	private double by=0;    
	private double xx;	//圆心点坐标
	private double yy;
	private double dx;  //小球每次移动的步长  
	private double dy;
	private String txt=null;
	private double Dsize=10;
	
	public Ball(Component c) { canvas = c; }

	public Ball(double bx,double by,Component c, Color color,String txt) { 
		canvas = c; 
		this.txt=txt;
		this.bx=bx;
		this.by=by;
		xx=bx+(XSIZE/2);
		yy=by+(YSIZE/2);
		this.color = color;
	}

	/**
	 * 根据x，y座标绘制当前小球
	 * @param g2
	 */
	public void draw(Graphics2D g2) { 
		if(color != null) g2.setColor(color); 
		g2.fill(new Ellipse2D.Double(bx, by, XSIZE, YSIZE));
		g2.setColor(Color.white);
		g2.drawString(txt, (int)xx-4, (int)yy+4);
	}

	/**
	 * 该方法控制小球的移动动作。移动小球其实就是把小球的座标位置改变一下，再调用画布的repaint方法。
	 *
	 */
	public synchronized void move(){
//		if(dx!=0||dy!=0){
//			System.out.println(Thread.currentThread().getName()+"   dx  "+dx);
//			System.out.println(Thread.currentThread().getName()+"   dy  "+dy);
//		}
		if((xx-XSIZE/2-15<Dsize&&yy-YSIZE/2-25<Dsize)		//左上角
				||(xx-XSIZE/2-15<Dsize&&Math.abs(yy-(canvas.getHeight()-YSIZE/2)+25)<Dsize)	//左下角
				||(Math.abs(xx-canvas.getWidth()+XSIZE/2+20)<Dsize&&yy-YSIZE/2-20<Dsize)		//右上角
				||(Math.abs(xx-canvas.getWidth()+XSIZE/2+20)<Dsize&&Math.abs(yy-canvas.getHeight()+YSIZE/2+20)<Dsize)	//右下角
				||(Math.abs(xx-canvas.getWidth()/2)<Dsize&&yy-YSIZE/2-20<Dsize)	//上中
				||(Math.abs(xx-canvas.getWidth()/2)<Dsize&&Math.abs(yy-canvas.getHeight()+YSIZE/2)-20<Dsize)){	//下中
				if(txt.equals("0")){
					xx=650;
					yy=185;
					bx=xx-XSIZE/2;
					by=yy-YSIZE/2;
					dx=0;
					dy=0;
					
				}else{
					BallFrame.labQiu.setText(BallFrame.labQiu.getText()+txt+" || ");
					YSIZE=0;
					XSIZE=0;
					Thread.currentThread().stop();
					((BallPanel)canvas).getBalls().remove(this);
				}
		}
		bx += dx;  by += dy;
		xx=bx+(XSIZE/2);
		yy=by+(YSIZE/2);
		if(!((xx-XSIZE/2-15<Dsize&&yy-YSIZE/2-25<Dsize)		//左上角
				||(xx-XSIZE/2-15<Dsize&&Math.abs(yy-(canvas.getHeight()-YSIZE/2)+25)<Dsize)	//左下角
				||(Math.abs(xx-canvas.getWidth()+XSIZE/2+20)<10&&yy-YSIZE/2-25<Dsize)		//右上角
				||(Math.abs(xx-canvas.getWidth()+XSIZE/2+20)<10&&Math.abs(yy-canvas.getHeight()+YSIZE/2+20)<Dsize)	//右下角
				||(Math.abs(xx-canvas.getWidth()/2)<Dsize&&yy-YSIZE/2-20<Dsize)	//上中
				||(Math.abs(xx-canvas.getWidth()/2)<Dsize&&Math.abs(yy-canvas.getHeight()+YSIZE/2)-20<Dsize))){
		if (bx -20< 0){  bx = 20;   dx = -dx;   }
		if ((bx + XSIZE-canvas.getWidth()+20)>0){ bx = canvas.getWidth()-20 - XSIZE; dx = -dx; }
		if (by -30< 0){  by = 30;  dy = -dy; }
		if (by + YSIZE >= canvas.getHeight()-30) { by = canvas.getHeight()-30 - YSIZE; dy = -dy;  }
//		canvas.repaint();
		for(int i=0;i<((BallPanel)canvas).getBalls().size();i++){
			Ball penBall=((Ball)((BallPanel)canvas).getBalls().get(i));
			double xx2=penBall.getXx();
			double yy2=penBall.getYy();
			double juLiX = (xx)-(xx2);
			double juLiY = (yy)-(yy2); 
			double juLi=Math.sqrt(juLiX*juLiX+juLiY*juLiY);
//System.out.println("JILI   "+juLi);
			if(this!=penBall&&juLi<XSIZE){
				double fx = juLiX/juLi; // 法线单位向量 
				double fy = juLiY/juLi; 
				double faktorback = (2*XSIZE)/juLi;  
				double skalarp = (dx*fx+dy*fy)-((penBall.getDx())*fx+(penBall.getDy())*fy); // 求法线上的合速度值  
				double Kraftx = fx * skalarp;  // 再分解为合速度向量  
				double Krafty = fy * skalarp;  
				(xx2)=(xx)-juLiX*faktorback;  // 把一个球回退到接触点,另一个却不退 
				(yy2)=(yy)-juLiY*faktorback; 
				(dx) = (dx - Kraftx); // 减掉法线上的速度，剩下切线上的速度！ 
				(dy) = (dy - Krafty); 
				penBall.setDx(penBall.getDx() + Kraftx);  
				penBall.setDy(penBall.getDy() + Krafty); 
			}
		}
		canvas.repaint();
		}
		canvas.repaint();
		new MoChaRun().start();
	}
	public double getXx() {
		return xx;
	}

	public double getYy() {
		return yy;
	}
	public void setXSIZE(int xsize) {
		XSIZE = xsize;
	}
	public void setYSIZE(int ysize) {
		YSIZE = ysize;
	}
	public void setDx(double dx) {
		this.dx = dx;
		speetX=dx;
	}
	public double getDx() {
		return dx;
	}
	public double getDy() {
		return dy;
	}
	public void setDy(double dy) {
		this.dy = dy;
		speetY=dy;
	}
	public void setSpeetX(double speetX) {
		this.speetX = speetX;
	}
	public void setSpeetY(double speetY) {
		this.speetY = speetY;
	}
	class MoChaRun extends Thread{
		@Override
		public void run() {
//System.out.println(Thread.currentThread().getName());
			try {
				sleep(100);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			if(dx>0){
				dx-=Math.abs(MOCHAX*speetX);
				if(dx<1){
					dx=0;
				}
			}else if(dx<0){
				dx+=Math.abs(MOCHAX*speetX);
				if(dx>-1){
					dx=0;
				}
			}
			if(dy>0){
				dy-=Math.abs(MOCHAY*speetY);
				if(dy<1){
					dy=0;
				}
			}else if(dy<0){
				dy+=Math.abs(MOCHAY*speetY);
				if(dy>-1){
					dy=0;
				}
			}
		}
	}
}