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📄 j2me 2d小游戏入门之游戏的框架.htm

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<DIV class=newsmallbox>J2ME 2D小游戏入门之游戏的框架 </DIV>
<DIV class=clear1></DIV>
<DIV class=newsmall1box>
<DIV class=newtitle1>作者： favoyang </DIV>
<DIV class=newtitle2>出处： J2ME开发网 </DIV>
<DIV class=newtitle3>责任编辑： 方舟 </DIV>
<DIV class=newtitle4>[ 2004-11-02 08:49 ]</DIV></DIV>
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<DIV class=newmiddlebox style="OVERFLOW: hidden">
<DIV class=guanggao><SPAN id=ad4></SPAN></DIV>　　一、游戏的框架 
<BR><BR>　　我们的游戏需要一个通用的游戏框架，也方便以后的开发，但实现一个引擎是复杂的。作为初学者如果要你考虑太多的问题，恐怕会让你偏离主线，这里只给出canvas的代码，不理解可以参看本站的另外一篇系列文章《使用MIDP2.0开发游戏》。<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
  <TBODY>
  <TR>
    <TD>public class MyGameCanvas extends GameCanvas<BR>　implements Runnable, 
      CommandListener{<BR>　　private static MyGameCanvas instance;<BR>　　Graphics 
      g;<BR>　　boolean running;<BR>　　Thread t;<BR>　　Command 
      startcmd,exitcmd,restartcmd;<BR>　　int keystate;<BR>　　boolean 
      keyevent;<BR>　　boolean 
      key_up,key_down,key_left,key_right,key_fire;<BR>　　private boolean 
      allowinput;<BR>　　public int screenwidth;<BR>　　public int 
      screenheight;<BR>　　boolean gameover;<BR>　　//define your variable 
      here<BR>　　//define your variable end<BR>　　protected MyGameCanvas() 
      {<BR>　　　super(true);<BR>　　　g=getGraphics();<BR>　　　running=false;<BR>　　　t=null;<BR>　　　addCommand(startcmd=new 
      Command("start",Command.OK,1));<BR>　　　addCommand(exitcmd=new 
      Command("exit",Command.EXIT,1));<BR>　　　setCommandListener(this);<BR>　　　screenwidth=getWidth();<BR>　　　screenheight=getHeight();<BR>　　　//put 
      your init once code here<BR>　　　//put your init once code 
      end<BR>　　}<BR>　　synchronized public static MyGameCanvas getInstance() 
      {<BR>　　　if (instance == null) {<BR>　　　　instance = new 
      MyGameCanvas();<BR>　　　　System.out.println("new 
      MyGameCanvas");<BR>　　　}<BR>　　　return instance;<BR>　　}<BR>　　public void 
      run(){<BR>　　　System.out.println("MyGameCanvas run start");<BR>　　　long 
      st=0,et=0,diff=0;<BR>　　　int rate=50;//16-17 frame per 
      second<BR>　　　while(running){<BR>　　　　st=System.currentTimeMillis();<BR>　　　　gameinput();<BR>　　　　gameMain();<BR>　　　　et=System.currentTimeMillis();<BR>　　　　diff=et-st;<BR>　　　　if(diff&lt;rate){<BR>　　　　　//System.out.println("Sleep 
      "+(rate-diff));<BR>　　　　　try {<BR>　　　　　　Thread.sleep(rate - 
      diff);<BR>　　　　　}<BR>　　　　　catch (InterruptedException ex) 
      {}<BR>　　　　}else{<BR>　　　　　//System.out.println("rush , and the frame using 
      time: "+diff);<BR>　　　　}<BR>　　　}<BR>　　　System.out.println("MyGameCanvas run 
      end");<BR>　　}<BR>　　public void 
      start(){<BR>　　　if(!running){<BR>　　　　running=true;<BR>　　　　t=new 
      Thread(this);<BR>　　　　t.start();<BR>　　　}<BR>　　}<BR>　　private void 
      gameMain() {<BR>　　　g.setColor(0,0,0);//clear 
      screen<BR>　　　g.fillRect(0,0,getWidth(),getHeight());<BR>　　　flushGraphics();<BR>　　}<BR>　　private 
      void gameInit() 
      {<BR>　　　gameover=false;<BR>　　　allowinput=true;<BR>　　　key_up=key_down=key_left=key_right=key_fire=false;<BR>　　}<BR>　　public 
      void stop(){<BR>　　　if(running){<BR>　　　　running = 
      false;<BR>　　　}<BR>　　}<BR>　　public void commandAction(Command c, 
      Displayable d) {<BR>　　　String 
      cmdstr=c.getLabel();<BR>　　　if(cmdstr.equals("start")){<BR>　　　　gameInit();<BR>　　　　start();<BR>　　　　removeCommand(startcmd);<BR>　　　　addCommand(restartcmd=new 
      Command("restart",Command.OK,1));<BR>　　　}else 
      if(cmdstr.equals("restart")){<BR>　　　　stop();<BR>　　　　while(t.isAlive());<BR>　　　　　gameInit();<BR>　　　　start();<BR>　　　}else 
      if(cmdstr.equals("exit")){<BR>　　　　stop();<BR>　　　　Navigate.midlet.destroyApp(false);<BR>　　　　Navigate.midlet.notifyDestroyed();<BR>　　　}<BR>　　}<BR>　　private 
      void gameinput() 
      {<BR>　　　if(allowinput){<BR>　　　　keystate=getKeyStates();<BR>　　　　keyevent=false;<BR>　　　　if((keystate 
      &amp; 
      UP_PRESSED)!=0){//up<BR>　　　　　key_up=true;keyevent=true;<BR>　　　　　//deal 
      your unstop job code here<BR>　　　　　//System.out.println("up 
      press");<BR>　　　　　//deal your unstop job code end<BR>　　　　}else if((keystate 
      &amp; UP_PRESSED)==0){//release 
      key<BR>　　　　　if(key_up==true){<BR>　　　　　　key_up=false;<BR>　　　　　　//deal your 
      one press-one job code here<BR>　　　　　　//System.out.println("up 
      release");<BR>　　　　　　//deal your one press-one job code 
      end<BR>　　　　　}<BR>　　　　}<BR>　　　　if((keystate &amp; 
      DOWN_PRESSED)!=0){//down<BR>　　　　　key_down=true;keyevent=true;<BR>　　　　　//deal 
      your unstop job code here<BR>　　　　　//System.out.println("down 
      press");<BR>　　　　　//deal your unstop job code end<BR>　　　　}else if((keystate 
      &amp; DOWN_PRESSED)==0){//release 
      key<BR>　　　　　if(key_down==true){<BR>　　　　　　key_down=false;<BR>　　　　　　//deal 
      your one press-one job code here<BR>　　　　　　//System.out.println("down 
      release");<BR>　　　　　　//deal your one press-one job code 
      end<BR>　　　　　}<BR>　　　　}<BR>　　　if((keystate &amp; 
      LEFT_PRESSED)!=0){//left<BR>　　　　key_left=true;keyevent=true;<BR>　　　　//deal 
      your unstop job code here<BR>　　　　//System.out.println("left 
      press");<BR>　　　　//deal your unstop job code end<BR>　　　}else if((keystate 
      &amp; LEFT_PRESSED)==0){//release 
      key<BR>　　　　if(key_left==true){<BR>　　　　　key_left=false;<BR>　　　　　//deal your 
      one press-one job code here<BR>　　　　　//System.out.println("left 
      release");<BR>　　　　　//deal your one press-one job code 
      end<BR>　　　　}<BR>　　　}<BR>　　　if((keystate &amp; 
      RIGHT_PRESSED)!=0){//right<BR>　　　　key_right=true;keyevent=true;<BR>　　　　//deal 
      your unstop job code here<BR>　　　　//System.out.println("right 
      press");<BR>　　　　//deal your unstop job code end<BR>　　　}else if((keystate 
      &amp; RIGHT_PRESSED)==0){//release 
      key<BR>　　　　if(key_right==true){<BR>　　　　　key_right=false;<BR>　　　　　//deal 
      your one press-one job code here<BR>　　　　　//System.out.println("right 
      release");<BR>　　　　　//deal your one press-one job code 
      end<BR>　　　　}<BR>　　　}<BR>　　if((keystate &amp; 
      FIRE_PRESSED)!=0){//fire<BR>　　　key_fire=true;keyevent=true;<BR>　　　//deal 
      your unstop job code here<BR>　　　//System.out.println("fire 
      press");<BR>　　　//deal your unstop job code end<BR>　　}else if((keystate 
      &amp; FIRE_PRESSED)==0){//release 
      key<BR>　　　if(key_fire==true){<BR>　　　　key_fire=false;<BR>　　　　//deal your 
      one press-one job code here<BR>　　　　//System.out.println("fire 
      release");<BR>　　　　//deal your one press-one job code 
      end<BR>　　　}<BR>　　}<BR>　　if(!keyevent){<BR>　　　//no keyevent 
      here<BR>　　　//System.out.println("NO KEY press");<BR>　　　//no keyevent 
      end<BR>　　}<BR>　}<BR>}<BR><BR>public static void 
      cleanJob(){<BR>　instance=null;<BR>}<BR><BR>}</TD></TR></TBODY></TABLE><BR>　　使用singlon实现，因为每个gamecanvas都需要很多的内存空间。另外对我们来说，只要改写gameInit()，gameMain(),一次性初始化的代码写在构造函数中。<BR><BR><BR><BR></DIV>
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href="javascript:d=document;t=d.selection?(d.selection.type!='None'?d.selection.createRange ().text:''):(d.getSelection?d.getSelection():'');void(vkey=window.open('http://www.bytemen.net/vkey/AddText.aspx?site=2005&amp;t='+escape(d.title)+'&amp;u='+escape(d.location.href)+'&amp;c='+escape(t),'vkey','scrollbars=no,width=475,height=575,left=75,top=20,status=no,resizable=yes'));vkey.focus();" 
target=_self>百特门</A> </SPAN><BR></DIV></DIV>
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