Java ME手机应用开发大全一书的配套光盘上的源码
源代码在线查看： boatgamecanvas.java
package boat;
import javax.microedition.lcdui.*;
/**
* 游戏界面
*/
public class BoatGameCanvas extends Canvas implements Runnable {
/**背景图片*/
private Image bgImage;
/**军舰图片数组，下标0代表向右，1代表向左*/
private Image boatImage[] = new Image[2];
/**军舰对象*/
Boat boat;
/**潜艇对象数组*/
Submarine[] submarine = new Submarine[2];
/**第一组潜艇图片*/
private Image[] sImage1 = new Image[2];
/**第二组潜艇图片*/
private Image[] sImage2 = new Image[2];
/**爆炸图片*/
private Image[] boomImage = new Image[3];
/**炸弹图片*/
private Image bombImage;
/**炸弹对象*/
private Bomb bomb;
//双缓冲
/**次画面*/
private Image offScreen;
/**次画笔*/
private Graphics offG;
/**屏幕宽度*/
private int width;
/**屏幕高度*/
private int height;
/**是否运行*/
private boolean isRunning = true;
/**是否连续移动*/
private boolean isRepeated = false;
/**军舰移动方向*/
private int boatDirection;
/**游戏得分*/
private int score = 0;
public BoatGameCanvas() {
try {
//导入背景图片
bgImage = Image.createImage("/res/bac.png");
//导入军舰图片
boatImage[0] = Image.createImage("/res/ship0.png");
boatImage[1] = Image.createImage("/res/ship1.png");
//导入炸弹图片
bombImage = Image.createImage("/res/boom.png");
//导入潜艇图片
sImage1[0] = Image.createImage("/res/q1.png");
sImage1[1] = Image.createImage("/res/h2.png");
sImage2[0] = Image.createImage("/res/r1.png");
sImage2[1] = Image.createImage("/res/q2.png");
//导入炸弹图片
boomImage[0] = Image.createImage("/res/b.png");
boomImage[1] = Image.createImage("/res/f1.png");
boomImage[2] = Image.createImage("/res/b2.png");
} catch (Exception e) {
e.printStackTrace();
}
//获得屏幕宽度和高度
width = this.getWidth();
height = this.getHeight();
//创建次画面和次画笔
offScreen = Image.createImage(width, height);
offG = offScreen.getGraphics();
//创建军舰对象
boat = new Boat(boatImage, width);
//创建潜艇对象
init(0);
init(1);
//创建炸弹对象
bomb = new Bomb(bombImage, 0, 0, height);
//创建线程
Thread t = new Thread(this);
//启动线程
t.start();
}
private void init(int num) {
if (num == 0) {
submarine[0] = new Submarine(sImage1, width, height, 0, boomImage);
}
if (num == 1) {
submarine[1] = new Submarine(sImage2, width, height, 1, boomImage);
}
}
/**
* 绘制方法
* @param g 系统画笔
*/
protected void paint(Graphics g) {
//清屏
offG.setColor(0xffffff);
offG.fillRect(0, 0, width, height);
offG.setColor(0);
//绘制背景图片
offG.drawImage(bgImage, 0, 0, Graphics.TOP | Graphics.LEFT);
//绘制军舰
boat.paint(offG);
//绘制潜艇
submarine[0].paint(offG);
submarine[1].paint(offG);
//绘制炸弹
if (bomb.isDisplay) {
bomb.paint(offG);
}
//绘制得分
offG.drawString("得分：" + score,4,4,Graphics.TOP | Graphics.LEFT);
//将次画面贴到主画面
g.drawImage(offScreen, 0, 0, Graphics.TOP | Graphics.LEFT);
}
public void keyPressed(int keyCode) {
//转换为游戏动作
int action = this.getGameAction(keyCode);
switch (action) {
case Canvas.LEFT: //向左移动军舰
isRepeated = true;
boatDirection = Boat.BOAT_MOVE_LEFT;
break;
case Canvas.RIGHT:
isRepeated = true;
boatDirection = Boat.BOAT_MOVE_RIGHT;
break;
case Canvas.FIRE:
//判断是否可以发射
if (!bomb.isDisplay) {
bomb.isDisplay = true;
//设置坐标
bomb.setX(boat.x + boat.getBoatImageWidth() / 2 -
bomb.getImageWidth() / 2);
bomb.setY(boat.Y + boat.getBoatImageHeight() -
bomb.getImageHeight());
}
break;
}
//重新绘制
repaint();
}
public void keyReleased(int keyCode) {
//转换为游戏动作
int action = this.getGameAction(keyCode);
switch (action) {
case Canvas.LEFT: //向左移动军舰
isRepeated = false;
break;
case Canvas.RIGHT:
isRepeated = false;
break;
}
}
/**
* 运行方法
*/
public void run() {
while (isRunning) {
//暂停
try {
Thread.sleep(100);
} catch (Exception e) {}
//移动军舰
if (isRepeated) {
boat.move(boatDirection);
}
//未爆炸则移动潜艇
if (!submarine[0].isIsBoom()) {
submarine[0].move();
} else { //播放爆炸效果
submarine[0].boom();
}
if (!submarine[1].isIsBoom()) {
submarine[1].move();
} else { //播放爆炸效果
submarine[1].boom();
}
//移动炸弹
if (bomb.isDisplay) {
bomb.move();
//判别是否碰撞
if (bomb.collidesWith(submarine[0])) {
bomb.handlecollidesWith(submarine[0]);
//分数增加
score += 10;
}
if (bomb.collidesWith(submarine[1])) {
bomb.handlecollidesWith(submarine[1]);
//分数增加
score += 10;
}
}
//垃圾回收
System.gc();
//重绘
repaint();
}
}
}
