M3G教程：进阶篇（四）模型
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import javax.microedition.lcdui.Graphics;import javax.microedition.lcdui.game.GameCanvas;import javax.microedition.m3g.Camera;import javax.microedition.m3g.Graphics3D;import javax.microedition.m3g.Light;import javax.microedition.m3g.Loader;import javax.microedition.m3g.Object3D;import javax.microedition.m3g.Transform;import javax.microedition.m3g.World;public class M3GCanvas extends GameCanvas implements Runnable {public static final int FPS = 50;//每秒绘制的帧数// Thread-controlboolean running = false;boolean done = true;// If the game should endpublic static boolean gameOver = false;// Rendering hintspublic static final int STRONG_RENDERING_HINTS = Graphics3D.ANTIALIAS| Graphics3D.TRUE_COLOR | Graphics3D.DITHER;public static final int WEAK_RENDERING_HINTS = 0;public static int RENDERING_HINTS = STRONG_RENDERING_HINTS;// Key arrayboolean[] key = new boolean[5];// Key constantspublic static final int FIRE = 0;public static final int UP = 1;public static final int DOWN = 2;public static final int LEFT = 3;public static final int RIGHT = 4;// Global identity matrixTransform identity = new Transform();// Camera rotationfloat camRot = 0.0f;double camSine = 0.0f;double camCosine = 0.0f;// Head bobbingfloat headDeg = 0.0f;private Graphics3D g3d;private World world;private boolean runnable=true;private Thread thread;private Camera camera;protected M3GCanvas() {super(false);setFullScreenMode(true);g3d = Graphics3D.getInstance();//Load our worldloadWorld();// Load our cameraloadCamera();}/** Loads our camera */private void loadCamera() {// BAD!if (world == null)return;// Get the active camera from the worldcamera = world.getActiveCamera();// Create a lightLight l = new Light();// Make sure it's AMBIENTl.setMode(Light.AMBIENT);// We want a little higher intensityl.setIntensity(3.0f);// Add it to our worldworld.addChild(l);}/** Loads our world */private void loadWorld() {try {// Loading the world is very simple. Note that I like to use a// res-folder that I keep all files in. If you normally just put// your// resources in the project root, then load it from the root.Object3D[] buffer = Loader.load("/map.m3g");// Find the world node, best to do it the "safe" wayfor (int i = 0; i < buffer.length; i++) {if (buffer[i] instanceof World) {world = (World) buffer[i];break;}}// Clean objectsbuffer = null;} catch (Exception e) {// ERROR!System.out.println("Loading error!");reportException(e);}}private void moveCamera() {// Check controlsif (key[LEFT]) {camRot += 5.0f;} else if (key[RIGHT]) {camRot -= 5.0f;}// Set the orientationcamera.setOrientation(camRot, 0.0f, 1.0f, 0.0f);// Calculate trigonometry for camera movementdouble rads = Math.toRadians(camRot);camSine = Math.sin(rads);camCosine = Math.cos(rads);if (key[UP]) {// Move forwardcamera.translate(-2.0f * (float) camSine, 0.0f, -2.0f* (float) camCosine);// Bob headheadDeg += 0.5f;// A simple way to "bob" the camera as the user movescamera.translate(0.0f, (float) Math.sin(headDeg) / 3.0f, 0.0f);} else if (key[DOWN]) {// Move backwardcamera.translate(2.0f * (float) camSine, 0.0f,2.0f * (float) camCosine);// Bob headheadDeg -= 0.5f;// A simple way to "bob" the camera as the user movescamera.translate(0.0f, (float) Math.sin(headDeg) / 3.0f, 0.0f);}// If the user presses the FIRE key, let's quitif (key[FIRE])System.out.println("Fire");}private void reportException(Exception e) {System.out.println(e.getMessage());System.out.println(e);e.printStackTrace();}protected void process() {int keys = getKeyStates();if ((keys & GameCanvas.FIRE_PRESSED) != 0)key[FIRE] = true;elsekey[FIRE] = false;if ((keys & GameCanvas.UP_PRESSED) != 0)key[UP] = true;elsekey[UP] = false;if ((keys & GameCanvas.DOWN_PRESSED) != 0)key[DOWN] = true;elsekey[DOWN] = false;if ((keys & GameCanvas.LEFT_PRESSED) != 0)key[LEFT] = true;elsekey[LEFT] = false;if ((keys & GameCanvas.RIGHT_PRESSED) != 0)key[RIGHT] = true;elsekey[RIGHT] = false;}public void run() {Graphics g = getGraphics();while (runnable) {long startTime = System.currentTimeMillis();//Call the process method (computes keys)process();//Move the camera aroundmoveCamera();try {//First bind the graphics object. We use our pre-defined rendering// hints.g3d.bindTarget(g, true, RENDERING_HINTS);//Now, just render the world. Simple as pie!g3d.render(world);} finally {g3d.releaseTarget();}flushGraphics();long endTime = System.currentTimeMillis(); long costTime = endTime - startTime; if(costTime<1000/FPS) { try{ Thread.sleep(1000/FPS-costTime); } catch(Exception e){ e.printStackTrace(); } }}System.out.println("Canvas stopped");}public void start(){thread=new Thread(this);thread.start();}public void stop(){this.runnable=false;try {thread.join();} catch (InterruptedException e) {e.printStackTrace();}}}?效果如下:
