📄 j2me 2d小游戏入门之计时器.htm
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<DIV class=newsmallbox>J2ME 2D小游戏入门之计时器 </DIV>
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<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>[ 2004-11-13 13:14 ]</DIV></DIV>
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<DIV class=guanggao><SPAN id=ad4></SPAN></DIV> 六、计时器和奖惩与评价
<BR><BR> 我们该加入我们的计时器了，我要从游戏开始时刻开始计时，并不断的更新到屏幕上，在游戏结束后计时器要停止工作。<BR><BR> 首先在初始化的时候将当前时刻记录下来：<BR><BR>
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<TD>gametime=0;<BR>gametimeoffset=System.currentTimeMillis();</TD></TR></TBODY></TABLE><BR> 以后只要游戏不gameover就在每个更新周期都进行一次计算：<BR><BR>
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<TD>gametime=(System.currentTimeMillis()-gametimeoffset)/1000;<BR>//转换为秒</TD></TR></TBODY></TABLE><BR> 下面要做的就是将它显示出来，还记得我们曾经实现的字体类了吗，这下子有用了，首先是实例化一个字体类：<BR><BR>
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<TD>img=ImageTools.getImage("/pic/b_number.png");<BR>fontbig=new
Font(g,img,10,15,<BR>new
char[]{'0','1','2','3','4','5','6','7','8','9'});</TD></TR></TBODY></TABLE><BR> 然后就是显示：<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
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<TD>fontbig.drawString(String.valueOf(gametime),screenwidth/2-15,10);</TD></TR></TBODY></TABLE><BR> 还真是方便yeah！<BR><BR> 接着是奖励系统，我们规定每过20s就加一个bomb给玩家。<BR><BR>
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<TD>int
awardindex=(int)gametime/20;//计算奖励时间<BR>if(awardindex>bombawardtop)<BR>awardindex=bombawardtop;<BR>if(bombaward[awardindex]!=0){//如果本20s没有奖励<BR>bombnum+=bombaward[awardindex];<BR>bombaward[awardindex]=0;//奖励过了<BR>}</TD></TR></TBODY></TABLE><BR> 尽可能简单和给出些提示是我写本文的原则,
所以评价系统，很ez。<BR><BR> 我们建立一个辅助类，提供一个方法，输入游戏时间，返回一个String评语。<BR><BR>
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<TD>public class StringTools {<BR> protected StringTools()
{<BR>}<BR><BR>public static String timeOpinion(long
gametime){<BR> if(gametime<10){<BR> return "Do you play with your
foot?";<BR> //return "i can't belive,your are a game master";<BR> }else
if(gametime<16){<BR> return "come boy, you can do it!";<BR> }else
if(gametime<20){<BR> return "what a pity! try again.";<BR> }else
if(gametime<25){<BR> return "very well, you are a real
man.";<BR> }else if(gametime<30){<BR> return "i know you have talent
of this game.";<BR> }else if(gametime<40){<BR> return "i can't belive,
your are a game master.";<BR> }else{<BR> return "oh my god, are you a
human?";<BR> }<BR>}<BR><BR>}</TD></TR></TBODY></TABLE><BR> 之后显示出来就好了，我手头没有合适大小的字体图片，我直接使用<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
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<TD>g.drawString(StringTools.timeOpinion(gametime),5,22,g.LEFT|g.TOP);</TD></TR></TBODY></TABLE><BR> 想在手机小小的屏幕容下那么东西是挺费劲的，其实这也是我对手机上玩游戏没什么兴趣，不过我对手机网络应用冲满了信心。
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