java键盘小球运动代码 java键盘小球运动代码怎么写

急求一个java的躲避弹球小游戏的代码

import java.awt.*;

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import java.awt.event.*;

import java.util.Random;

import javax.swing.Timer;

public class PinBall

{

private final int TABLE_WIDTH = 300;//桌面宽度

private final int TABLE_HEIGHT = 400;//桌面高度

private final int RACKET_Y = 340;//球拍的垂直位置

private final int RACKET_HEIGHT = 20;//球拍高度

private final int RACKET_WIDTH = 60;//球拍宽度

private final int BALL_SIZE = 16;//球的大小

private Frame f = new Frame("弹球游戏");//实例化一个窗口

Random rand = new Random();//实例化一个随机数生成器

private int ySpeed = 10;//小球的纵向运动数度、

private double xyRate = rand.nextDouble() - 0.5;//返回一个-0.5到0.5之间的比率用控制小球运动方向

private int xSpeed = (int)(ySpeed*xyRate*2);//这个横向速度在-10到10之间，产生左右摆动运动效果

private int ballX = rand.nextInt(200)+20;//小球开始的横坐标位置，200表示产生0到100之间的随机数

private int ballY = rand.nextInt(10)+20;//小球开始的纵坐标位置

private int racketX = rand.nextInt(200);//球拍开始时的横坐标位置

private MyCanvas tableArea = new MyCanvas();//实力化一个画布工具，集成Canvas类

private String shape = "";//保存需要绘制图形的字符串属性

Timer timer;//声明一个时间变量

private boolean isLose = false;//表示游戏是否结束

public void init()

{

tableArea.setPreferredSize(new Dimension(TABLE_WIDTH,TABLE_HEIGHT));//定义画布大小

f.add(tableArea);//添加画布到窗口

KeyAdapter keyProcessor = new KeyAdapter()//实例化一个键盘监听事件适配器

{

public void keyPressed(KeyEvent ke)//重写适配器里面的按下某键盘方法

{

if(ke.getKeyCode()==KeyEvent.VK_LEFT)//按下键盘左键时

{

if(racketX 0)//球拍左边框不能出画布的左边框

racketX -=10;//按一左键次向左移动10个像素

}

if(ke.getKeyCode()==KeyEvent.VK_RIGHT)//按下键盘右键时

{

if(racketX TABLE_WIDTH - RACKET_WIDTH)//球拍右边框不能出画布的右边框

racketX +=10;//按一次右键移动向右移动10个像素

}

}

};

f.addKeyListener(keyProcessor);//给窗口添加键盘监听器

tableArea.addKeyListener(keyProcessor);//给画布添加键盘监听器

ActionListener taskPerformer = new ActionListener()//这里是实例化了一个监听接口，这个接口里面只有一个方法

{

public void actionPerformed(ActionEvent evt)//重写这个接口里面的方法，判断小球的位置

{

if(ballX=0 || ballX=TABLE_WIDTH-BALL_SIZE)//保证小球横向上在画布之内运动

{

xSpeed = -xSpeed;//触发反方向运动

}

if(ballY=RACKET_Y-BALL_SIZE(ballXracketX||ballXracketX+RACKET_WIDTH))//出了球拍的可击打范围

{

timer.stop();//停止对监听器的触发

isLose=true;//将标志isLose变量置为true

tableArea.repaint();//调用画布的重绘方法

}

else if(ballY=0||(ballY=RACKET_Y-BALL_SIZEballYracketXballX=racketX+RACKET_WIDTH))//小球在球拍之内，而其到达球拍的高度

{

ySpeed=-ySpeed;//上下方向改变，小球反弹

}

ballY+=ySpeed;//小球的坐标在纵向上增加

ballX+=xSpeed;//小球的坐标在横向上的增加

tableArea.repaint();//调用画布的重绘方法3

}

};

timer = new Timer(100,taskPerformer);//每隔0.1秒运行一次监听器

timer.start();//计时器开始运行

f.addWindowListener(new MyListener());//关闭窗口事件

f.pack();//设置窗口最佳大小

f.setVisible(true);//显示窗口

}

class MyListener extends WindowAdapter//关闭窗口的类

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

public static void main(String[] args)//程序入口

{

new PinBall().init();//调用PinBall类里面的init()方法

}

class MyCanvas extends Canvas//建一个集成Canvas类的类

{

public void paint(Graphics g)//重写父类的绘图方法

{

if(isLose)//如果isLose为真，则在画布里打印“游戏已结束”

{

g.setColor(new Color(255,0,0));//当前颜色

g.setFont(new Font("黑体",Font.BOLD,30));//字体名称，样式，大小

g.drawString("游戏已结束！",50,200);//按坐标绘制文字图形

}

else//负责

{

g.setColor(new Color(240,240,80));//当前颜色

g.fillOval(ballX,ballY,BALL_SIZE,BALL_SIZE);//填充颜色，根据坐标和长宽填充圆形

g.setColor(new Color(80,80,200));//当前颜色

g.fillRect(racketX,RACKET_Y,RACKET_WIDTH,RACKET_HEIGHT);//填充颜色，根据坐标和长宽填充矩形

}

}

}

}

怎么用java模拟小球的圆周运动？

//简单的做个

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.Timer;

public class Circle extends JFrame {

public Circle(){

super();

CirclePanel panel=new CirclePanel();

add(panel, "Center");

setSize(500, 500);

setVisible(true);

}

public static void main(String[] args) {

new Circle();

}

class CirclePanel extends JPanel{

public static final double PI=Math.PI;

private int degree=0;

private int axisx;

private int axisy;

public CirclePanel(){

setSize(500, 500);

axisx=getWidth()/2;

axisy=getHeight()/2;

setVisible(true);

Timer timer=new Timer(10,new TimerListener());

timer.start();

}

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g);

g.fillRect(axisx, axisy, 2, 2);

g.drawOval((int)(axisx-100+5), (int)(axisy-100+5), 200, 200);

g.fillOval(-(int)(100*Math.sin(PI*degree/180))+axisx,

(int)(100*Math.cos(PI*degree/180))+axisy, 10, 10);

}

class TimerListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

degree += 1;

repaint();

}

}

}

}

java程序:编写一个程序,让一个小球在JFrame中滚动,当碰边缘时则选择一个角度返回.

05年写的，你修改一下吧

/*

* 一个在窗体中来回运动的圆.java

*

* Created on 2005年10月5日, 下午1:02

*

* To change this template, choose Tools | Options and locate the template under

* the Source Creation and Management node. Right-click the template and choose

* Open. You can then make changes to the template in the Source Editor.

*/

package javaapplication1;

import java.applet.Applet;

import java.awt.Color;

import java.awt.Event;

import java.awt.Graphics;

import java.applet.*;

import java.awt.*;

import java.math.*;

/**

*

* @author Bachelorlrz

*/

public class 在窗体中来回运动的圆 extends java.applet.Applet implements java.lang.Runnable {

int cx,cy,c1x,c1y; //圆的坐标

int cw,ch; //圆的宽高

int bx,by,bw,bh; //背景的坐标和宽高

int dx,dx1; //圆的运动

int r,rx,ry; //圆的半径和位置

int r1,r1x,r1y;

Thread u_thread;

/** Initialization method that will be called after the applet is loaded

* into the browser.

*/

public void init() {

rx=150; ry=160;

bw=500; bh=400;

r1x=bw/2-cw*2; r1y=bh/2-ch;

r=60; r1=200;

cx =rx; cy =ry;

c1x=r1x; c1y=r1y;

cw=30; ch=30;

bx=2; by=2;

dx=1; dx1=2;

// TODO start asynchronous download of heavy resources

}

// TODO overwrite start(), stop() and destroy() methods

public void update(java.awt.Graphics g) {

super.paint(g);

g.setColor(Color.red);

g.drawRect(bx,by,bw,bh);

g.setColor(Color.BLACK);

g.fillRect(bx+2,by+2,bw-4,bh-4);

g.drawString("在窗体中来回运动的圆", bw/2-60, bh/2);

if (cxrx-r || cxrx+r) {

dx = -dx;

}

if (c1xr1x-r1 || c1xr1x+r1) {

dx1 = -dx1;

}

cx =cx+dx;

cy =(int)(dx*Math.sqrt(r*r-(cx-rx)*(cx-rx)))+ry;

c1x =c1x+dx1;

c1y =(int)(dx1/2*Math.sqrt(r1*r1-(c1x-r1x)*(c1x-r1x))/2);

// g.drawArc(cx, cy, cw, ch, 0, 360);

for(int i=0;i8;i++){

if (i%5 == 0){

g.setColor(Color.black);

}else if ( i%5== 1) {

g.setColor(Color.GREEN);

}else if(i%5==2){

g.setColor(Color.RED);

}else if( i%5 ==3){

g.setColor(Color.pink);

}else {

g.setColor(Color.orange);

}

g.drawLine(bx,by, cx+10,cy+i+10);

g.drawLine(bx+bw,by+bh,cx+10,cy+i+10);

g.drawLine(bx+bw,by, cx+10,cy+i+10);

g.drawLine(bx,by+bh, cx+10,cy+i+10);

g.drawLine(bx,by,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx+bw,by+bh,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx+bw,by,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx,by+bh,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx,by, c1x+10,c1y+r1y+i+10);

g.drawLine(bx+bw,by+bh,c1x+10,c1y+r1y+i+10);

g.drawLine(bx+bw,by, c1x+10,c1y+r1y+i+10);

g.drawLine(bx,by+bh, c1x+10,c1y+r1y+i+10);

g.drawLine(bx,by, r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx+bw,by+bh,r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx+bw,by, r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx,by+bh,r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawArc(cx+i, cy+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(-cx+bw-bx-cw+i, cy+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(c1x+i, c1y+r1y+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(r1x+r1+cw-c1x+i, -c1y+r1y+i, cw-i*2, ch-i*2, 0, 360);

}

}

public void start(){

if (u_thread == null)

{

u_thread = new Thread(this);

u_thread.start();

}

}

public void run() {

while(true){

repaint();

try{

u_thread.sleep(10);

}

catch (InterruptedException e){

return;

}

}

}

}

滚动的小球 java源代码

;

要制造那种效果只需要大约 30 行 Java 代码：

import javax.swing.*;

import java.awt.*;

import java.awt.geom.*;

class RollingBall extends JPanel {

Ellipse2D.Float ball = new Ellipse2D.Float( -100, 100, 50, 50 );

public void paintComponent( Graphics g ) {

super.paintComponent( g );

Graphics2D g2 = ( Graphics2D ) g;

// Draw the ball

g2.fill( ball );

// Draw the rotating ellipse by skewing the Device Space

double angdeg =     // One rotation per ball's travelling over its perimeter

ball.x++ % ( Math.PI * ball.width ) / ( Math.PI * ball.width ) * 360;

g2.rotate( Math.toRadians( angdeg ), ball.getCenterX( ), ball.getCenterY( ) );

g2.scale( .5, 1 );

g2.translate( ball.getCenterX( ), 0 );

g2.setColor( Color.gray );

g2.fill( ball );

}

public void roll( ) throws Exception {

while( true ) {

repaint( );

Thread.sleep( 8 );

}

}

public static void main( String[ ] args ) throws Exception {

JFrame f = new JFrame( );

RollingBall rb = new RollingBall( );

f.setSize( 999, 185 );

f.getContentPane( ).add( rb );

f.setVisible( true );

rb.roll( );

}

}