第6章、MIDP游戏编程.pptVIP

J2ME程序设计-第六章 MIDP游戏编程; 本章要点;游戏API库概述－类库结构;游戏API库概述－工作原理;1。用Sprite画前景;游戏API库概述－类库结构;游戏API库概述－类库结构;GameCanvas－图形绘制机制 ;使用GameCanvas;按键状态查询 ;按键状态查询 ;按键状态查询;按键状态查询 ;按键状态查询 ;按键状态查询 ;按键状态查询 ;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;LayerManager和Layer;GameCanvas坐标系;LayerManager和Layer;LayerManager和Layer;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;(20,20);Sprite;(35,35);Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;Sprite;在象素模式中， 只有当两个不透明的象素重叠时才定义为碰撞;Sprite;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;TiledLayer;程序实例分析;/**Component initialization*/ private void jbInit() throws Exception { // Set up this Displayable to listen to command events setCommandListener(this); // add the Exit command addCommand(new Command(Exit, Command.EXIT, 1)); laymanager=new LayerManager(); Image backtu,flytu; try{ backtu=Image.createImage(/resource/backgroud.png); flytu=Image.createImage(/resource/fly.png); } catch(IOException ie){ System.out.println(Cannot load image.); return; } backgroud=new TiledLayer(10, 500, backtu, 30,30);; Random t=new Random(); int r; for(int i=0;i10;i++){ for(int j=0;j500;j++){ r=t.nextInt(3); if (r 1) r = 2; else r = 1; backgroud.setCell(i,j,r); } } fly=new Sprite(flytu); laymanager.append(fly); laymanager.append(backgroud); ;g=getGraphics(); int xm,ym; xm=10*30; ym=500*30; x=(xm-getWidth())/2; y=ym-getHeight(); canvaswidth=getWidth(); canvasheight=getHeight(); laymanager.setViewWindow(x,y,canvaswidth,canvasheight); fly.move((xm-flytu.getWidth())/2,ym-flytu.getHeight()); laymanager.paint(g,0,0);