m3gcanvas.java

来自「3D手机游戏开发实例源代码」· Java 代码 · 共 175 行

import javax.microedition.lcdui.*;

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

public class M3GCanvas extends GameCanvas implements Runnable {
    private Graphics3D g3d ;

    private World world;
    private Mesh cube;
    private Background bg;
    private Camera camera;
    private Light light;
    private Node ground;
    private KeyframeSequence seq;
    private int iStartTime;
    private long sSeed = 5555555;
    private Graphics g;
    
    public M3GCanvas(){
        super(true);
        world = new World();
        cube = createCube();
        bg = new Background();
        bg.setColor(0xff200080);
        world.setBackground(bg);

        camera = new Camera();
        camera.setPerspective(90.0f, 1.0f, 1.0f, 100.0f);
        camera.setTranslation(0.0f, 0.0f, 30.0f);
        world.addChild(camera);
        world.setActiveCamera(camera);

        light = new Light();
        light.setTranslation(0.0f, 0.0f, 30.0f);
        world.addChild(light);

        ground = (Node)cube.duplicate();
        ground.setTranslation(0.0f, -15.0f, 0.0f);
        ground.setScale(2.0f, 0.1f, 2.0f);
        world.addChild(ground);


            int num = 5;
            int duration = 3000;
            int comps = 4;

            cube.setScale(0.5f, 0.5f, 0.5f);
            world.addChild(cube);

   //      KeyframeSequence seq = new KeyframeSequence(num, comps, KeyframeSequence.LINEAR);
   
           KeyframeSequence seq = new KeyframeSequence(num, comps, KeyframeSequence.SLERP);
//          KeyframeSequence seq = new KeyframeSequence(num, comps, KeyframeSequence.SPLINE);
    //        KeyframeSequence seq = new KeyframeSequence(num, comps, KeyframeSequence.SQUAD);
   //       KeyframeSequence seq = new KeyframeSequence(num, comps, KeyframeSequence.STEP);
//          seq.setRepeatMode(KeyframeSequence.CONSTANT);
            seq.setRepeatMode(KeyframeSequence.LOOP);
            seq.setDuration(duration);
            for (int j = 0; j < num; j++)
            {
                float[] value = new float[comps];
                for (int k = 0; k < comps; k++)
                {
                    value[k] = ((float)random() - 0.5f) * 30.0f;
                }
                seq.setKeyframe(j, (j * 2 + 1) * duration / (num * 2), value);
            }

            AnimationController ctrl = new AnimationController();

      //    AnimationTrack track = new AnimationTrack(seq, AnimationTrack.TRANSLATION);
            AnimationTrack track = new AnimationTrack(seq, AnimationTrack.ORIENTATION);
            track.setController(ctrl);

            cube.addAnimationTrack(track);
            iStartTime = (int)System.currentTimeMillis();
        Thread t = new Thread(this);
        t.start();
    }
          
    /**
     * 由thread执行的方法
     */
    public void run() {
        Graphics g = getGraphics();
        while(true) {
            tick();
            draw(g);
            try {
                Thread.sleep(200); 
            }
            catch (InterruptedException e) {
                
            }
        }
    }

    /**
     * 每经过一定时间的处理
     */
    private void tick() {
        world.animate((int) System.currentTimeMillis() - iStartTime);
        world.align(null);

    }


    /**
     * 描绘处理
     */
    protected void draw( Graphics g ) {
        g.setColor( 255, 255, 255 );
        g.fillRect( 0, 0, getWidth(), getHeight() ); 
        g3d = Graphics3D.getInstance();
        g3d.bindTarget(g);

        try{
            g3d.render(world); 
      

        }catch(Exception e){
            System.err.println(e);
        }finally{
            g3d.releaseTarget();
        }

        flushGraphics();
    }


    
      public static Mesh createCube()
    {
        byte[] vert = { 10, 10, 10, -10, 10, 10, 10, -10, 10, -10, -10, 10,
                -10, 10, -10, 10, 10, -10, -10, -10, -10, 10, -10, -10, -10,
                10, 10, -10, 10, -10, -10, -10, 10, -10, -10, -10, 10, 10, -10,
                10, 10, 10, 10, -10, -10, 10, -10, 10, 10, 10, -10, -10, 10,
                -10, 10, 10, 10, -10, 10, 10, 10, -10, 10, -10, -10, 10, 10,
                -10, -10, -10, -10, -10, };

        VertexArray vertArray = new VertexArray(vert.length / 3, 3, 1);
        vertArray.set(0, vert.length / 3, vert);

        byte[] norm = { 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, -127,
                0, 0, -127, 0, 0, -127, 0, 0, -127, -127, 0, 0, -127, 0, 0,
                -127, 0, 0, -127, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, 127,
                0, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, -127, 0,
                0, -127, 0, 0, -127, 0, 0, -127, 0, };

        VertexArray normArray = new VertexArray(norm.length / 3, 3, 1);
        normArray.set(0, norm.length / 3, norm);

        int[] stripLen = { 4, 4, 4, 4, 4, 4 };
        
        VertexBuffer vertexBuf = new VertexBuffer();
        vertexBuf.setPositions(vertArray, 1.0f, null);
        vertexBuf.setNormals(normArray);
        
        IndexBuffer indexBuf = new TriangleStripArray(0, stripLen);
        
        Appearance app = new Appearance();
        app.setMaterial(new Material());
        
        return new Mesh(vertexBuf, indexBuf, app);
    }
    private double random()
    {
        sSeed = (16807 * sSeed + 3) % 0xFFFFFFF;
        return (double) sSeed / (double) 0xFFFFFFF;
    }

}