J2ME手机游戏设计案例源代码-MenuCanvas.doc

*MenuMIDimport javax.microedition.lcdui.Display;import javax.microedition.midlet.MIDlet;/* * To change this template, choose Tools | Templates * and open the template in the editor. */* * MenuMID为MIDlet主程序 */public class MenuMID extends MIDlet private Display display; private MenuCanvas canvas; /声明画布对象canvas private MainCanvas mcanvas; public MenuMID()display = Display.getDisplay(this); /获取Display canvas=null; mcanvas=null; LoadMenu(); /载入菜单 protected void startApp() protected void pauseApp() protected void destroyApp(boolean arg0) /* 退出程序 */ public void exit() System.gc(); /清理垃圾 destroyApp(false); notifyDestroyed(); /* LoadMenu()函数用于创建菜单画布，并设置为当前显示对象*/ public void LoadMenu() canvas=null; canvas=new MenuCanvas(this); /创建菜单对象canvas display.setCurrent(canvas); /设置canvas为当前显示对象 /* LoadMainCanvas()函数用于创建游戏主画布，并设置为当前显示对象*/ public void LoadMainCanvas() canvas=null; if(mcanvas=null) /如果没有创建游戏主画布，则先创建 mcanvas=new MainCanvas(this); display.setCurrent(mcanvas); *MainCanvasimport javax.microedition.lcdui.Canvas;import javax.microedition.lcdui.Graphics;/* * To change this template, choose Tools | Templates * and open the template in the editor. */* * MainCanvas实现程序主画面 */public class MainCanvas extends Canvas private MenuMID mid; /声明MIDlet对象，以方便调用MIDlet /* 构造函数中，将MenuMID作为参数传入 */ public MainCanvas(MenuMID midlet) super(); this.setFullScreenMode(true); /设置为全屏模式 mid=midlet; /将传入的MenuMID赋给mid /* 绘图 */ protected void paint(Graphics g) /填充背景 g.setColor(0x00ffffff); g.fillRect(0, 0, getWidth(), getHeight(); /绘制画面内容 g.setColor(0x00ff0000);/设置画笔颜色 g.drawString(游戏开始, getWidth()/2, 50, Graphics.HCENTER|Graphics.BASELINE); /* 响应按键事件，并进行处理*/ protected void keyReleased(int keyCode) int keyAction=getGameAction(keyCode);/通过按键获取游戏动作 / 检查游戏动作，并作相应处理 switch(keyAction) case Canvas.GAME_A: mid.LoadMenu(); /调用MIDlet以转到菜单画面 break; case Canvas.GAME_B: mid.exit(); /调用MIDlet以退出程序 break; repaint(); /重绘 *MenuCanvasimport javax.microedition.lcdui.Canvas;import javax.microedition.lcdui.Font;import javax.microedition.lcdui.Graphics;/* * MenuCanvas实现游戏菜单画面 */public class MenuCanvas extends Canvas public MenuMID mid; /声明MIDlet对象，以方便调用MIDlet static int CurrMenuID; /声明当前菜单索引 static final String StrMenu=开 始,排行榜,设 置,关 于,退 出; /菜单项数组 static int MenuLocY; /绘制菜单时第一项的顶端Y坐标 /定义中等字体 private Font mediumFont=Font.getFont(Font.FACE_SYSTEM,Font.STYLE_PLAIN, Font.SIZE_MEDIUM); /定义加粗中等字体 private Font mediumBoldFont=Font.getFont(Font.FACE_SYSTEM,Font.STYLE_BOLD, Font.SIZE_MEDIUM); /定义加粗大字体 private Font largeFont=Font.getFont(Font.FACE_SYSTEM,Font.STYLE_BOLD, Font.SIZE_LARGE); /* 在构造函数中进行变量初始化*/ public MenuCanvas(MenuMID midlet) super(); setFullScreenMode(true); /设置为全屏模式 this.mid=midlet; /将传入的MenuMID赋给mid CurrMenuID=0; /设置开始时的默认菜单项为第1项 MenuLocY=100; /设置菜单项起始Y坐标为100 repaint(); /重绘 /* 绘制画面内容*/ protected void paint(Graphics g) /填充背景 g.setColor(0x00ffffff); g.fillRect(0, 0, getWidth(), getHeight(); /绘制标题 g.setColor(0x00ff0000); /设置标题颜色 g.setFont(largeFont); /设置字体 g.drawString(太空之战, getWidth()/2, 50, Graphics.HCENTER|Graphics.BASELINE); /调用drawMenu()函数绘制菜单 drawMenu(g,CurrMenuID); /* 响应按键事件*/ protected void keyReleased(int keyCode) int keyAction=getGameAction(keyCode);/通过按键获取游戏动作 / 检查游戏动作，并作相应处理 switch(keyAction) case Canvas.UP: /选择上一项菜单 CurrMenuID=Math.max(CurrMenuID-1,0); break; case Canvas.DOWN: /选择下一项菜单 CurrMenuID=Math.min(CurrMenuID+1,StrMenu.length-1); break; case Canvas.FIRE: /执行所选中的菜单 switch(CurrMenuID) /判断当前选中的菜单项并执行 case 0: mid.LoadMainCanvas(); /用MIDlet以加载主画面 break; case 4: mid.exit(); /用MIDlet以退出程序 break; break; repaint(); /重绘 /* drawMenu函数用于绘制菜单 */ private void drawMenu(Graphics g, int menuID) /循环绘制菜单项 for(int i=0;i5;i+) /检查是否为当前选中的菜单项 if(i=menuID) /如果是当前选中的菜单项，则绘制为高亮显示 g.setColor(0x00b0b0b0); g.fillRect(0,MenuLocY+(i-1)*mediumBoldFont.getHeight() , getWidth(),mediumBoldFont.getHeight();/绘制菜单项背景 /绘制高亮菜单项 g.setColor(0x00f0f000); g.setFont(mediumBoldFont); g.drawString(StrMenui, getWidth()/2, MenuLocY+i*mediumBoldFont.getHeight(), Gr