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作者:朱先忠编译 来源:天极 2007年9月4日
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package com.kontio; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import java.lang.IllegalArgumentException; import java.io.*; import java.util.*; import javax.microedition.m3g.*; public class Example3D extends MIDlet implements CommandListener{ //我们在场景中使用的对象的UserID static final int POGOROO = 554921620; static final int CAMERA = 769302310; static final int TRANSFORM = 347178853; static final int ROO = 418071423; private Display myDisplay = null; private ExampleCanvas myCanvas = null; private Timer myRefreshTimer = new Timer(); private TimerTask myRefreshTask = null; private Command exitCommand = new Command("Exit", Command.ITEM, 1); Graphics3D myGraphics3D = Graphics3D.getInstance(); World myWorld = null; private AnimationController animRoo = null; private Group tRoo = null; private Group tCams = null; private Group acRoo = null; private int animLength = 0; int viewport_x; int viewport_y; int viewport_width; int viewport_height; public Example3D(){ super(); myDisplay = Display.getDisplay(this); myCanvas = new ExampleCanvas(this); myCanvas.setCommandListener(this); myCanvas.addCommand(exitCommand); } public void startApp() throws MIDletStateChangeException{ myDisplay.setCurrent(myCanvas); try{ // 从文件中加载World myWorld = (World)Loader.load("/pogoroo.m3g")[0]; getObjects(); setupAspectRatio(); } catch(Exception e){ e.printStackTrace(); } myRefreshTask = new RefreshTask(); // 调度一个重要执行的计时器以显示出帧速率20fps. myRefreshTimer.schedule(myRefreshTask, 0, 50); } void setupAspectRatio(){ viewport_x = 0; viewport_y = 0; viewport_width = myCanvas.getWidth(); viewport_height = myCanvas.getHeight(); Camera cam = myWorld.getActiveCamera(); float[] params = new float[4]; int type = cam.getProjection(params); if(type != Camera.GENERIC){ //计算窗口的宽高比例 float waspect=viewport_width/viewport_height; if (waspect float height = viewport_width/params[1]; viewport_height=(int)height; viewport_y=(myCanvas.getHeight()-viewport_height)/2; } else{ float width = viewport_height*params[1]; viewport_width=(int)width; viewport_x=(myCanvas.getWidth()-viewport_width)/2; } } } public void getObjects(){ try{ tRoo = (Group) myWorld.find(POGOROO); tCams = (Group) myWorld.find(CAMERA); acRoo = (Group) myWorld.find(TRANSFORM); animRoo = (AnimationController) myWorld.find(ROO); //取得动画的长度 AnimationTrack track = acRoo.getAnimationTrack(0); animLength = 1000; // 缺省的长度,1秒 if (track != null){ KeyframeSequence ks = track.getKeyframeSequence(); if (ks != null) animLength = ks.getDuration(); } } catch(Exception e){ e.printStackTrace(); } } public void pauseApp(){} public void destroyApp(boolean unconditional) throws MIDletStateChangeException{ myRefreshTimer.cancel(); myRefreshTimer = null; myRefreshTask = null; } public void paint(Graphics g){ if(g.getClipWidth() != viewport_width || g.getClipHeight() != viewport_height || g.getClipX() != viewport_x || g.getClipY() != viewport_y){ g.setColor(0x00); g.fillRect(0, 0, myCanvas.getWidth(), myCanvas.getHeight()); } if ((myGraphics3D != null) && (myWorld != null)){ myGraphics3D.bindTarget(g); myGraphics3D.setViewport(viewport_x, viewport_y, viewport_width, viewport_height); myGraphics3D.render(myWorld); myGraphics3D.releaseTarget(); } } public void commandAction(Command cmd, Displayable disp) { if (cmd == exitCommand){ try{ destroyApp(false); notifyDestroyed(); } catch(Exception e){ e.printStackTrace(); } } } private class RefreshTask extends TimerTask{ public void run(){ if(myCanvas !=null && myGraphics3D != null && myWorld != null{ int startTime = (int)System.currentTimeMillis(); int validity = myWorld.animate(startTime); myCanvas.repaint(viewport_x, viewport_y, viewport_width, viewport_height); } } } class ExampleCanvas extends Canvas{ Example3D myRooMIDlet; int i = 0; ExampleCanvas(Example3D Testlet) { myRooMIDlet = Testlet; } void init() { } void destroy() { } protected void paint(Graphics g) { myRooMIDlet.paint(g); } protected void keyPressed(int i) { } protected void keyReleased(int i) { } protected void keyRepeated(int i) { } protected void pointerDragged(int x, int y) { } protected void pointerPressed(int x, int y) { } protected void pointerReleased(int x, int y) { } } } |
九、运行在模拟器中的例程
图1展示了例程在WTK模拟器中运行的结果。图中的袋鼠和田地看上去棒极了。如果设计者选择对其中任何对象改变一下的话,可以用the3D工具来完成,而在例程MIDlet中不需要作任何变化。
图1 例程在模拟器中运行的结果
十、结论
现在,你又看到一种使用JSR 184(也称移动3D API)的更高级的方式来创建3D应用程序。在保留模式下,设计者可以使用现有的3D建模工具来创建3D世界和其中的对象,然后把这些模型输出到M3G文件中。之后,应用程序只需装入该模型并在屏幕上绘制3D世界的视图即可。
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