J2ME 3D学习笔记——实现简单的界面(附代码)-优快云博客

博客给出了MIDlet和M3GCanvas的代码示例。MIDlet代码实现了应用启动等功能，M3GCanvas代码完成了图片导入、World对象获取、Graphics3D和Camera对象处理等，还实现了按键事件处理，按UP键可移动相机并重新绘制。

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//MIDlet代码

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class Test3DMIDlet extends MIDlet{
M3GCanvas m3g = new M3GCanvas();
public void startApp(){
Display.getDisplay(this).setCurrent(m3g);
}

public void pauseApp(){}
public void destroyApp(boolean b){}
}

//Canvas代码

import javax.microedition.lcdui.*;
import javax.microedition.m3g.*;

public class M3GCanvas extends Canvas{
/**World对象*/
private World world;
/**Graphics3D对象*/
Graphics3D g3d;
/**Camera对象*/
Camera camera;

public M3GCanvas(){
  try{
   //导入图片
   Object3D[] obj = Loader.load("/res/pogoroo.m3g");
   //获得图片中的World对象
   for(int i = 0;i < obj.length;i++){
    if(obj[i] instanceof World){
     world = (World)obj[i];
     break;
    }
   }
   //获得Graphics3D对象
   g3d = Graphics3D.getInstance();
   //获得获得Camera
   camera = world.getActiveCamera();
  }catch(Exception e){
   System.out.println(e);
  }

}

public void paint(Graphics g){
  try{
   //绑定
   g3d.bindTarget(g);
   //代理
   g3d.render(world);

  }catch(Exception e){

  }finally{
   //释放
   g3d.releaseTarget();
  }
}

public void keyPressed(int keyCode){
  int action = this.getGameAction(keyCode);

  if(action == Canvas.UP){
   //移动相机
   camera.setTranslation(0,0,0.2f);
  }
  //重新绘制
  repaint();
}
}