micro3dcanvas.java

3D手机游戏开发实例源代码

import javax.microedition.lcdui.*;

import javax.microedition.lcdui.game.*;
import com.mascotcapsule.micro3d.v3.*;

public class Micro3DCanvas extends GameCanvas implements Runnable {
    private Graphics3D g3d;
    private Figure  figure;  //model
    private Texture[] textures = new Texture[3]; //Texture的排列
    private AffineTrans vtrans  = new AffineTrans(); // 视点变换行列
    private AffineTrans trans   = new AffineTrans(); // 视点变换行列
    private AffineTrans xtrans  = new AffineTrans(); // 视点变换行列
    private AffineTrans ytrans  = new AffineTrans(); // 视点变换行列
    private FigureLayout layout = new FigureLayout(); // FigureLayout 对象
    private Effect3D effect = new Effect3D(); // Effect3D 对象
    private boolean running;              // 根据thread显示有无loop处理的flag
    private int cx = getWidth()  / 2;     // display的中心x坐标
    private int cy = getHeight() / 2;     // display的中心y坐标
    private int x_angle = 0;              // x 轴周围的转角
    private int y_angle = 0;              // y 轴周围的转角
    private int frameNumber = 0;          // frame号码
    private int actionIndex = 0;          // action号码
    private ActionTable actionTable;      // ActionTable对象
    private int frameSpacing = 65536 * 2; // frame的变化量
    private int frameMax;                 // frame号码的最大值
    private int textureIndex = 0;         // 使用的texture的index
    private int move_delta = 10;          // 平行移动单位
    private int angle_delta = 4096 / 36;  // 转动单位
    private int distance = 4096 / 2;      // 从视点到对象的距离
    private int distance_delta = 4096 / 60; // 从视点起距离的变化量
        
    public Micro3DCanvas(){
        super(false);
        
        // resource的读取
        try { 
            figure = new Figure( "/robot.mbac" ); 
            textures[0] = new Texture( "/robot_texture1.bmp", true ); 
            textures[1] = new Texture( "/robot_texture2.bmp", true ); 
            textures[2] = new Texture( "/robot_texture3.bmp", true ); 
            actionTable = new ActionTable( "/robot.mtra" ); 
        } catch( Exception e ) { 
            e.printStackTrace();
        } 
        figure.setTexture( textures[0] ); 
        vtrans.lookAt(new Vector3D(0, 0, distance), 
                      new Vector3D(0, 0, -1),
                      new Vector3D(0, 1, 0));

        frameMax = actionTable.getNumFrames(actionIndex);

        // thread的开始
        running = true;
        Thread t = new Thread(this);
        t.start();
    }
          
    /**
     * 根据thread执行的方法
     */
    public void run() {
        Graphics g = getGraphics();
        while(running) {
            tick();
            draw(g);
            try {
                Thread.sleep(100); 
            }
            catch (InterruptedException e) {
                stop();
            }
        }
    }
    
    /**
     * 根据被按下按键改变移动方向
     */
     protected void keyPressed(int key) {
        switch(key){
            // 1-9的数字键操作
            case KEY_NUM1: // 缩小(远离视点)
                distance += distance_delta;
                vtrans.lookAt(new Vector3D(0, 0, distance), 
                              new Vector3D(0, 0, -1),
                              new Vector3D(0, 1, 0));
                break;
            case KEY_NUM2: // 向上移动
                cy -= move_delta;
                break; 
            case KEY_NUM3: // 扩大(接近视点)
                distance -= distance_delta;
                vtrans.lookAt(new Vector3D(0, 0, distance), 
                              new Vector3D(0, 0, -1),
                              new Vector3D(0, 1, 0));
                break;
            case KEY_NUM4: // 向左移动
                cx -= move_delta;
                break;
            case KEY_NUM6: // 向右移动
                cx += move_delta;
                break;
            case KEY_NUM7: // 降低动画速度
                if(frameSpacing > 1) {
                    frameSpacing /= 2;
                }
                break;
            case KEY_NUM8: // 向下移动
                cy += move_delta;
                break;
            case KEY_NUM9: // 提高动画速度
                if(frameSpacing < frameMax / 8) {
                    frameSpacing *= 2;
                }
                break;
            default:
                // 上下左右的动作键操作
                switch(getGameAction(key)) {
                case UP: // x 轴周围正向转动
                    x_angle += angle_delta;
                    break;
                case DOWN: // x 轴周围负向转动
                    x_angle -= angle_delta;
                    break;
                case RIGHT: // y 轴周围正向转动
                    y_angle += angle_delta;
                    break;
                case LEFT: // y 轴周围负向转动        
                    y_angle -= angle_delta;
                    break;
                case FIRE: // texture的切换
                    textureIndex = (textureIndex + 1 ) % 3;
                    figure.setTexture( textures[textureIndex] ); 
                    break;
                }
            
        }
    }
        
    /**
     * 每经过一定时间的处理
     */
    private void tick() {
        frameNumber = frameNumber + frameSpacing;
           
        if (frameNumber >= actionTable.getNumFrames(actionIndex)) {
            actionIndex = (actionIndex + 1) % 2;
            frameNumber = 0;
            frameMax = actionTable.getNumFrames(actionIndex);
        }
        figure.setPosture(actionTable, actionIndex, frameNumber);
        xtrans.setRotationX( x_angle ); 
        ytrans.setRotationY( y_angle ); 
        trans.mul( xtrans, ytrans ); 
        trans.mul( vtrans, trans ); 
        layout.setAffineTrans( trans ); 
        layout.setCenter( cx, cy * 3 / 2); 
        layout.setPerspective( 1, 4096 * 2, 4096/6 );    
    }

    /**
     * 描绘处理
     */
    protected void draw( Graphics g ) {
        g.setColor( 255, 255, 255 );
        g.fillRect( 0, 0, getWidth(), getHeight() ); 
       try{
            g3d.drawFigure( figure, 0, 0, layout, effect ); 
      
            g3d.flush();
        }catch(Exception e){
            System.err.println(e);
        }finally{
            g3d.release(g);
        }
       
      
        g.setColor( 0, 0, 0 );
        g.drawString("frameNumber:" + frameNumber, 
            10, getHeight() - 15, Graphics.BOTTOM | Graphics.LEFT );
        g.drawString("frameSpacing:" + frameSpacing, 
            10, getHeight(), Graphics.BOTTOM | Graphics.LEFT );
        flushGraphics();
    }

    /**
     * thread的停止
     */
    public void stop() {
        running = false;
    }
}