mainclass.java

J2ME手机游戏开发技术详解随书光盘

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

import javax.microedition.m3g.*;
import javax.microedition.io.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;

import java.io.*;

public class MainClass extends MIDlet{
    private Display d;
    
    public MainClass(){
        d = Display.getDisplay(this);
    }
    
    public void startApp() {
        
        d.setCurrent(new jsrCanvas(this));
    }

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

}

class jsrCanvas extends GameCanvas implements Runnable{

    private World world;
    private Graphics3D g3d = null;
    private Camera camera;
    private Mesh mesh;
    private boolean distance = false;
    private MIDlet midlet;
    
    public jsrCanvas(MIDlet m){
        super(false);
        midlet = m;
        
        setFullScreenMode(true);
        g3d = Graphics3D.getInstance();

        world = new World();
        
        camera = new Camera();
        world.addChild(camera);

        float w = getWidth();
        float h = getHeight();

        camera.setPerspective(60.0f, w / h, 0.1f, 1000f);

        mesh = MeshCreator.createMesh();
        mesh.translate(0.0f, 0.0f, -5.0f);
        world.addChild(mesh);
        world.setActiveCamera(camera);

        Thread t = new Thread(this);
        t.start();
    }
    
    public void keyPressed(int key){
        switch(key){
            case -6:
                midlet.notifyDestroyed();
                break;
            case -7:
                
                distance ^= true;

                if(distance){
                    mesh.setTranslation(0.0f, 0.0f, -15.0f); 
                }else{
                    mesh.setTranslation(0.0f, 0.0f, -5.0f); 
                }
                
                break;
            case -11:
                break;
        }
    }
    
    public void run(){
        Graphics g = getGraphics();

        FPS fps = new FPS();
        
        while(true){
          
            mesh.postRotate(1.0f, 0.0f, 1.0f, 0.0f);
            
            fps.calculateFps();
            draw3D(g);
            g.setColor(0xFF0000);
            g.drawString(fps.fps_string, 0, 0, 0);
            flushGraphics();
        }
    }
    public void draw3D(Graphics g){
        try{
            g3d.bindTarget(g);
            g3d.render(world);
        }catch(Exception e){
            
        }finally{
            g3d.releaseTarget();
        }
    }    
    
}


class MeshCreator{
    
    public static Mesh createMesh(){

        byte []coordinates = new byte[] {-1, 3, -1, //1

        short []textures = new short[44];
        int offset = 255/10;
        int x = 0, y=0;
       for(int i=0;i<44; i+=2){
           x = x==0?255:0;

           if(i>0 && x==255)
               y+=offset;
           
           textures[i] = (short)x;
           textures[i+1] = (short)y;
           
       }

        byte []normals = new byte[] {-32, 96, -32,
                                                           
        int []stripLengths = new int[] {22};
        int []strip = new int[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21};

        VertexArray va = new VertexArray(coordinates.length/3, 3, 1);
        va.set(0, coordinates.length/3, coordinates);
        VertexArray no = new VertexArray(normals.length/3, 3, 1);
        no.set(0, normals.length/3, normals);
        VertexArray tx = new VertexArray(textures.length/2, 2, 2);
        tx.set(0, textures.length/2, textures);
        
        VertexBuffer vb = new VertexBuffer();
        vb.setPositions(va, 1.0f, null);
        vb.setNormals(no);
        vb.setTexCoords(0, tx, (1.0f/255.0f), null);

        TriangleStripArray tsa = new TriangleStripArray(strip, stripLengths);

        PolygonMode pm = new PolygonMode();
        pm.setShading(PolygonMode.SHADE_SMOOTH);
        pm.setCulling(PolygonMode.CULL_NONE);

        Material material = new Material();
        material.setColor(Material.AMBIENT, 0xFFFF0000);

        Appearance app = new Appearance();
        app.setPolygonMode(pm);

       app.setMaterial(material);

        try{
            Image texImg = Image.createImage("/texture.png"); // load the image
            Texture2D texture = new Texture2D(new Image2D(Image2D.RGB, texImg)); // create texture from loaded image.
            texture.setWrapping(Texture2D.WRAP_REPEAT, Texture2D.WRAP_REPEAT); // repeat texture on surface
            texture.setBlending(Texture2D.FUNC_DECAL); // Blend mode to use.
            texture.setFiltering(Texture2D.FILTER_NEAREST, Texture2D.FILTER_NEAREST); // Use nearest for performance, linear for quality
            app.setTexture(0, texture);
        }catch(Exception e){
            System.out.println("Failed to create texture");
        }
        
        Mesh m;
        m = new Mesh(vb, tsa, app);
        m.setAppearance(0, app);
        return m;
    }
}


class FPS{
 
    public static int fps = 10;
    private int count_fps;
    public String fps_string;
    private long last;
 
    public FPS(){
        fps = 10;
        count_fps = 0;
    }
 
    public void calculateFps(){
        count_fps++;
 
        long n = System.currentTimeMillis() / 1000;
 
        if (n != last) {
            fps = count_fps;
            count_fps = 0;
            fps_string = "Fps:" + fps;
            last = n;
        }
    }
}