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Swing动画之子弹
一、游戏效果图： 飞机发射的子弹
二、实现原理：重写paintComponet方法，按照一定的时间间隔，让子弹的坐标一直向Y轴递减，这样这实现了子弹的运动效果，子弹重画的开始位置就是飞机的坐标。
三、代码：在前两次的基础，把代码进行一些简单优化，如下：
package com.jack;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import javax.swing.JPanel;
import com.jack.imp.IProcess;
/**
* 游戏背景
*
* @author laughing
* @date 2014年11月20日 下午8:12:25
*/
public class BackGround implements IProcess {
private static final Image[] BG_IMAGES = ImageManager.getInstance()
.getImagesByType("background");
private static final int SPEED = 20;
private int topX = 0;
private int topY = -480;
private int belowX = 0;
private int belowY = 0;
@Override
public void drawMyself(Graphics g, JPanel p) {
g.drawImage(BG_IMAGES[1], topX, topY, (ImageObserver) p);
g.drawImage(BG_IMAGES[0], belowX, belowY, (ImageObserver) p);
}
@Override
public void move() {
if (topY >= 0) {
topY = -480;
} else {
topY += SPEED;
}
if (belowY >= 480) {
belowY = 0;
} else {
belowY += SPEED;
}
}
@Override
public boolean collison() {
// TODO Auto-generated method stub
return false;
}
}
package com.jack;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import javax.swing.JPanel;
import com.jack.imp.IProcess;
/**
* 游戏子弹
*
* @author laughing
* @date 2014年11月20日 上午10:27:12
*/
public class Bullet implements IProcess {
public static final Image[] BULLET_IMAGES = ImageManager.getInstance()
.getImagesByType("bullet");
public static final int FLY_SPEED = 20;
private boolean dead = false;
public int x;
public int y;
public Bullet(int x, int y) {
this.x = x - 50;
this.y = y;
}
public boolean outOfBounds() {
if (this.y == 0) {
this.dead = true;
return false;
}
return true;
}
/**
* @return the y
*/
public int getY() {
return y;
}
/**
* @return the x
*/
public int getX() {
return x;
}
/*
* (non-Javadoc)
*
* @see com.jack.imp.IProcess#drawMyself(java.awt.Graphics,
* javax.swing.JPanel)
*/
@Override
public void drawMyself(Graphics g, JPanel p) {
// TODO Auto-generated method stub
g.drawImage(BULLET_IMAGES[0],
x,
y - BULLET_IMAGES[0].getHeight(null),
(ImageObserver) p);
}
/*
* (non-Javadoc)
*
* @see com.jack.imp.IProcess#move()
*/
@Override
public void move() {
if (outOfBounds())
this.y -= FLY_SPEED;
}
/*
* (non-Javadoc)
*
* @see com.jack.imp.IProcess#collison()
*/
@Override
public boolean collison() {
// TODO Auto-generated method stub
return false;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "Bullet [dead=" + dead + ", x=" + x + ", y=" + y + "]";
}
/**
* @return the dead
*/
public boolean isDead() {
return dead;
}
}
package com.jack;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.ImageObserver;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JPanel;
import com.jack.imp.IProcess;
/**
* 战斗机
*
* @author laughing
* @date 2014年11月20日 下午2:16:21
*/
public class Plan implements IProcess, KeyListener {
private static final Image[] PLAN_IMAGES = ImageManager.getInstance()
.getImagesByType("plan");
public static Map<Integer, Bullet> bulletMap = new HashMap<Integer, Bullet>();
private static final int PLAN_MOVE_SPEED = 10;
private static int bulletID = 0;
public static int imageIndex = 0;
private int x;
private int y;
public Plan(int x, int y) {
this.x = x;
this.y = y;
}
public void shut() {
Bullet b = new Bullet(x, y);
bulletMap.put(++bulletID, b);
System.out.println("crate " + bulletMap);
}
@Override
public void drawMyself(Graphics g, JPanel p) {
g.drawImage(PLAN_IMAGES[imageIndex], x, y, (ImageObserver) p);
}
public void updatePlan() {
if (imageIndex == 5)
imageIndex = 0;
imageIndex++;
}
@Override
public void move() {
}
@Override
public boolean collison() {
// TODO Auto-generated method stub
return false;
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_UP) {
if (y - PLAN_MOVE_SPEED >= 0) {
y -= PLAN_MOVE_SPEED;
}
}
if (key == KeyEvent.VK_DOWN) {
if (y + PLAN_MOVE_SPEED <= GamePanel.HEIGHT - PLAN_IMAGES[0].getHeight(null) * 2) {
y += PLAN_MOVE_SPEED;
}
}
if (key == KeyEvent.VK_LEFT) {
if (x - PLAN_MOVE_SPEED >= 0)
x -= PLAN_MOVE_SPEED;
}
if (key == KeyEvent.VK_RIGHT) {
if (x + PLAN_MOVE_SPEED < GamePanel.WEIGHT - PLAN_IMAGES[0].getWidth(null))
x += PLAN_MOVE_SPEED;
}
if (key == KeyEvent.VK_SPACE) {
shut();
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
package com.jack;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
import javax.swing.border.SoftBevelBorder;
/**
* 游戏容器
*
* @author laughing
* @date 2014年11月16日 下午7:58:11
*/
public class GamePanel extends JPanel implements Runnable {
public static final int HEIGHT = 480;
public static final int WEIGHT = 320;
public static Plan plan = new Plan(160, 400);
public static BackGround ground = new BackGround();
public GamePanel() {
setSize(WEIGHT, HEIGHT);
setBorder(new SoftBevelBorder(1, Color.white, Color.white));
// Sets the focusable state of this Component to the specified value.
// This value overrides the Component's default focusability.
setFocusable(true);
// 监听事件
addKeyListener(plan);
new Thread(this).start();
}
/*
* (non-Javadoc)
*
* @see javax.swing.JComponent#paintComponent(java.awt.Graphics)
*/
@Override
protected void paintComponent(Graphics g) {
// TODO Auto-generated method stub
super.paintComponent(g);
ground.drawMyself(g, this);
plan.drawMyself(g, this);
for (int key : plan.bulletMap.keySet()) {
Bullet b = plan.bulletMap.get(key);
if (!b.isDead()) {
b.drawMyself(g, this);
}
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
plan.updatePlan();
ground.move();
for (int key : plan.bulletMap.keySet()) {
Bullet b = plan.bulletMap.get(key);
if (!b.isDead()) {
b.move();
}
}
repaint();
try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
package com.jack;
import javax.swing.JFrame;
/**
*
* @author laughing
* @date 2014年11月16日 下午8:11:39
*/
public class Main extends JFrame {
GamePanel panel = new GamePanel();
public Main() {
setSize(panel.getWidth(), panel.getHeight());
getContentPane().add(panel);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
}
public static void main(String args[]) {
new Main();
}
}
四、源码：点击打开链接Swing动画之子弹
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