J2ME游戏编程－玛莉赛跑

/** * @(#)MaliCanvas.java * Copyright (c) 2004-2005 wuhua of workroom Inc. All Rights Reserved. * @version 1.0, 10/05/2004 * @author 饶荣庆 * @author 余煜辉 */ package com.wuhua.mali; import java.util.Timer; import javax.microedition.lcdui.Command; import javax.microedition.lcdui.CommandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Font; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.game.GameCanvas; public class MaliCanvas extends GameCanvas implements CommandListener { //--------------------------------------------------------- //属性字段 /** *定义一个屏幕对象用于显示游戏窗体 */ public Display display; /** *游戏菜单类 */ public WelcomeToGame welcomeToGame; /** *玛莉类 */ public Mali mali = null; /** *游戏线程类 */ public GameThread game; /** *栏杆类 */ public Parapet parapet = null; /** *A Timer */ private Timer timer; private MillisecondTask mt; /** *启动与暂停变量,来控制时间 */ public static boolean isStart; private static boolean isPause; /** *定义游戏3个软键用来控制游戏 */ private Command goCommand = null; private Command pauseCommand = null; private Command stopCommand = null; private Command backCommand = null; /** *定义屏幕宽度变量 */ public int DISP_WIDTH = getWidth(); /** *定义屏幕高度变量 */ public int DISP_HEIGHT = getHeight(); /** *画布的水平位置 */ public static int CANVAS_X; /** *画布的垂直位置 */ public static int CANVAS_Y; /** *定义图象玛莉前进贴的顺序 */ private int order; /** *定义玛莉跳跃贴的顺序 */ private int jumpOrder = 1; /** *定义判断玛莉是否跳过 */ private boolean isJump; /** *玛莉跑的路程 */ private int distance; /*时间格式字符串*/ private String theTime; //---------------------------------------------------------- // 初始化 /** * standard constructor. */ public MaliCanvas() { super(true); try { this.mali = new Mali(10, (DISP_HEIGHT/4) * 3 - 24); } catch(Exception e) {} try { this.parapet = new Parapet(DISP_WIDTH - 10, (DISP_HEIGHT/4) * 3); } catch(Exception e) { } /*用来计算玛莉赛跑用掉的时间*/ this.timer = new Timer(); this.mt = new MillisecondTask(); /*初始化时间格式*/ this.theTime = "00:00"; this.game= new GameThread(this); this.drawScreen(this.getGraphics()); //初始化游戏界面 this.goCommand = new Command("Go", Command.OK, 2); this.pauseCommand = new Command("Pause", Command.OK, 2); this.stopCommand = new Command("Stop", Command.OK, 2); this.backCommand = new Command("Back", Command.BACK, 2); this.addCommand(goCommand); this.addCommand(backCommand); this.setCommandListener(this); //this.maliManager = new MaliManager(0,0, DISP_WIDTH, DISP_HEIGHT); } //---------------------------------------------------------- // 方法 public void showForm(Display display, WelcomeToGame welcomeToGame)// GameMenu gameMenu) //显示窗体 { this.welcomeToGame = welcomeToGame; this.display = display; this.display.setCurrent(this); } /** *返回图形给线程用的方法 */ public Graphics getGraph() { return this.getGraphics(); } /** *处理用户按件游戏事件的方法 */ public void input() { /*获得按键代号*/ int keyStates = getKeyStates(); // Left if ((keyStates & RIGHT_PRESSED) != 0) { this.down(); this.maliAction(); this.parapetAction(); //this.checkCollision(); } // Right if ((keyStates & LEFT_PRESSED) !=0 ) { this.maliLeftDecelerate(); //减速 } // Up if ((keyStates & UP_PRESSED) != 0) { this.jump(); } if (this.distance == 110) //等于110米游戏结束 { this.game.requestStop(); //停止游戏 this.removeCommand(pauseCommand); this.addCommand(goCommand); } } /** *用来描述玛莉的运动状态 */ public void maliAction() { mali.setFrame(order); /*检查有没有跟栏杆碰撞*/ //if (this.parapet.getRefPixelX() > DISP_WIDTH/3) //{ this.checkCollision(); //} /*玛莉加速到一定位置时保持哪个位置*/ if (mali.getRefPixelX() < DISP_WIDTH/3) { mali.advance(); } if (game.delay > 30) { game.delay = game.delay - 3; //延迟减少来显示加速 } /*假如栏杆出了屏幕则创建一个新的，并显示出来*/ if (parapet.getRefPixelX() < 0) { /*假如一个栏杆消失了则玛莉跑的路程加10*/ this.distance = this.distance + 10; try { this.parapet = new Parapet(DISP_WIDTH, (DISP_HEIGHT/4) * 3); } catch(Exception e) { } /*当一个栏杆消失后，玛莉的速度加快，为了保持玛莉与栏杆的相对速度，所以栏杆的速度加快*/ this.parapetAction(); //保持玛莉与栏杆的相对运动 } order++; //动画的贴号 if (order>3) { order=0; } } /** *栏杆的移动速度方法 */ public void parapetAction() { this.parapet.advance(); this.parapet.accelerate(); //加速 } /** *玛莉遇到障碍时减速 */ public void maliDecelerate() { this.game.delay = 60; //用延迟来显示玛莉减速 this.parapet.advance(); this.parapet.decelerate(); //减速 } /** *按向左键时候玛莉减速 */ public void maliLeftDecelerate() { mali.setFrame(order); if (game.delay < 80) { game.delay = game.delay + 5; //延迟减少来显示加速 } order++; //动画的贴号 if (order >= 3) { order = 2; //玛莉停下来的时候固定的贴号 } this.parapet.advance(); //栏杆前进 this.parapet.decelerate(); //减速 } /** *在画布里实现玛莉跳跃的方法 */ public void jump() { if (!isJump) { this.mali.setFrame(0); this.parapetAction(); //给栏杆运动使玛莉产生跳跃的效果 this.mali.jump(); } isJump = true; this.checkCollision(); } /** *在画布实现玛莉下降的方法 */ public void down() { if (isJump) { this.parapetAction(); //给栏杆运动产生跳跃的效果 this.parapetAction(); /*用来延迟运行*/ for (int i = 0; i < 5001; i++ ) { if (i == 5000 && isJump) { this.mali.down(); this.isJump = false; } } } } /** *碰撞算法 */ public void checkCollision() { if (this.isJump == true) { } else if (this.parapet.getRefPixelX() > DISP_WIDTH/3 && this.isJump == false ) { if(this.mali.checkCollision(this.parapet)) { this.maliDecelerate();//玛莉减速 this.parapet.setFrame(1); //假如被玛莉碰到，则栏杆倒下 } } /*if (this.) { }*/ } /*实现记时器的方法*/ public void clock() { timer.schedule(mt, 1, 1); //锁定时间进度为0.001秒，并放置这个时间隔要运行的程序。 } /** *格式化时间的方法 */ public void formatTime(int l) { int sec = l / 60; int millisec = l % 60; if (sec < 10) { theTime = "0" + sec + ":"; } else { theTime = sec + ":"; } if (millisec < 10) { theTime = theTime + "0" + millisec ; } else { theTime = theTime + millisec ; } } /** *此方法是用来画出玛莉与栏杆 */ public void drawScreen(Graphics g) { /*背景颜色*/ // g.setColor(255, 255,255); // black g.fillRect(0, 0, DISP_WIDTH, DISP_HEIGHT ); g.setColor(0); g.drawString("Time:", DISP_WIDTH/2, 50, Graphics.LEFT | Graphics.TOP); g.drawString("Distance: " + " meter", DISP_WIDTH/2 - 100, 50, Graphics.LEFT | Graphics.TOP); /*显示时间与路程*/ this.formatTime(mt.getTime()); g.setColor(255); g.drawString(" " + theTime, DISP_WIDTH/2, 50, Graphics.LEFT | Graphics.TOP); g.drawString(" " + distance , DISP_WIDTH/2 - 100, 50, Graphics.LEFT | Graphics.TOP); /*跑道的