「java球摇晃」java实现球的移动
今天给各位分享java球摇晃的知识，其中也会对java实现球的移动进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
- 1、怎么用java模拟小球的圆周运动？
- 2、JAVA用repaint方法在窗格内实现小球的来回碰撞，怎么在窗格边缘改变小球的运动方向呢？
- 3、这个JAVA程序的小球怎么不会动
- 4、用JAVA实现多线程编写,使得许多小球在界面内循环跳动
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用repaint方法在窗格内实现小球的来回碰撞，怎么在窗格边缘改变小球的运动方向呢？
public class DrawBall extends JFrame {
int x, y, width, height;
Color c;
int incX = 10;//X方向增量
int incY = 10;//Y方向增量
public DrawBall() {
super("寂寞高手不寂寞");
setSize(800, 600);
setVisible(true);
x = 0;
y = 0;
width = height = 50;
c = new Color(255, 0, 0);
}
public static void main(String[] args) {
DrawBall a = new DrawBall();
}
public void paint(Graphics g) {
Container pane = getContentPane();
Graphics pg = pane.getGraphics();
pg.setColor(Color.WHITE);
pg.fillRect(0, 0, pane.getWidth(), pane.getHeight());
//从这里开始改变小球的运动方向
if (x+width pane.getWidth() || x 0) {//X边界判断
incX *= -1; //增量方向反转
}
if (y+height pane.getHeight() || y 0) {//Y边界判断
incY *= -1;//增量方向反转
}
x = x + incX;
y = y + incY;
pg.setColor(c);
pg.fillOval(x, y, width, height);
try {
Thread.sleep(100);
} catch (InterruptedException E) {
};
repaint();
}
}
这个JAVA程序的小球怎么不会动
我给你改为了 碰到边界后会朝相反的方向移动 这里必须要用线程
通过repaint〉〉〉paint
public class Pratice
{
public Pratice()
{
JFrame f = new JFrame("my app");
MyPanel mp = new MyPanel();
f.setLocation(300, 300);
f.setSize(320, 340);
f.add(mp);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Thread thread = new Thread(() -
{
while (true)
{
try
{
mp.repaint();
Thread.sleep(100);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
});
thread.start();
}
public static void main(String[] args)
{
new Pratice();
}
}
@SuppressWarnings("serial")
class MyPanel extends Panel
{
private int x, y, r, vx, vy;
int bounce = -1;
public MyPanel()
{
x = 20;
y = 20;
r = 100;
vx = 20;
vy = 20;
}
public void paint(Graphics g)
{
g.setColor(Color.BLUE);
g.fillOval(x, y, r, r);
x += vx;
y += vy;
if (x = 0)
{
x = 0;
vx *= bounce;
} else if (x + r 300)
{
x = 300 - r;
vx *= bounce;
}
if (y = 0)
{
y = 0;
vy *= bounce;
} else if (y + r = 300)
{
y = 300 - r;
vy *= bounce;
}
}
}
用JAVA实现多线程编写,使得许多小球在界面内循环跳动
下面这段代码应该符合你的需求
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class BounceThread
{ public static void main(String[] args)
{ JFrame frame = new BounceThreadFrame();
frame.show();
}
}
class BounceThreadFrame extends JFrame
{ public BounceThreadFrame()
{ setSize(300, 200);
setTitle("Bounce");
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} );
Container contentPane = getContentPane();
canvas = new JPanel();
contentPane.add(canvas, "Center");
JPanel p = new JPanel();
addButton(p, "Start",
new ActionListener()
{ public void actionPerformed(ActionEvent evt)
{ Ball b = new Ball(canvas);
b.start();
}
});
addButton(p, "Close",
new ActionListener()
{ public void actionPerformed(ActionEvent evt)
{ canvas.setVisible(false);
System.exit(0);
}
});
contentPane.add(p, "South");
}
public void addButton(Container c, String title,
ActionListener a)
{ JButton b = new JButton(title);
c.add(b);
b.addActionListener(a);
}
private JPanel canvas;
}
class Ball extends Thread
{ public Ball(JPanel b) { box = b; }
public void draw()
{ Graphics g = box.getGraphics();
g.fillOval(x, y, XSIZE, YSIZE);
g.dispose();
}
public void move()
{ if (!box.isVisible()) return;
Graphics g = box.getGraphics();
g.setXORMode(box.getBackground());
g.fillOval(x, y, XSIZE, YSIZE);
x += dx;
y += dy;
Dimension d = box.getSize();
if (x 0)
{ x = 0; dx = -dx; }
if (x + XSIZE = d.width)
{ x = d.width - XSIZE; dx = -dx; }
if (y 0)
{ y = 0; dy = -dy; }
if (y + YSIZE = d.height)
{ y = d.height - YSIZE; dy = -dy; }
g.fillOval(x, y, XSIZE, YSIZE);
g.dispose();
}
public void run()
{ try
{ draw();
for (int i = 1; i = 1000; i++)
{ move();
sleep(5);
}
}
catch(InterruptedException e) {}
}
private JPanel box;
private static final int XSIZE = 10;
private static final int YSIZE = 10;
private int x = 0;
private int y = 0;
private int dx = 2;
private int dy = 2;
}
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