mycanvas.java

Java ME手机应用开发大全一书的配套光盘上的源码

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

public class MyCanvas extends Canvas {

private Graphics3D graphics3d;
private Camera camera;
private Light light;
private float angle = 0.0f;
private Transform transform = new Transform();
private Background background = new Background();
private VertexBuffer vbuffer;
private IndexBuffer indexbuffer;
private Appearance appearance;
private Material material = new Material();
private Image image;

public MyCanvas() {
	// 创建Displayable对象以探听命令事件
     setCommandListener(new CommandListener() {
     public void commandAction(Command c, Displayable d) {
if(c.getCommandType() == Command.EXIT) {
	MIDletMain.quitApp();}}
	});
	try { init();}
	catch(Exception e) { e.printStackTrace();}
}
/*** 组件的初始化*/
private void init() throws Exception {
	addCommand(new Command("Exit", Command.EXIT, 1));
	graphics3d = Graphics3D.getInstance();
camera = new Camera();
camera.setPerspective( 60.0f,(float)getWidth()/ (float)getHeight(),1.0f,1000.0f );
light = new Light();
light.setColor(0xffffff);
light.setIntensity(1.25f);

short[] vert = {
	5, 5, 5, -5, 5, 5, 5,-5, 5, -5,-5, 5,
	-5, 5,-5, 5, 5,-5, -5,-5,-5, 5,-5,-5,
	-5, 5, 5, -5, 5,-5, -5,-5, 5, -5,-5,-5,
	5, 5,-5, 5, 5, 5, 5,-5,-5, 5,-5, 5,
	5, 5,-5, -5, 5,-5, 5, 5, 5, -5, 5, 5,
	5,-5, 5, -5,-5, 5, 5,-5,-5, -5,-5,-5 };
	VertexArray vertArray = new VertexArray(vert.length / 3, 3, 2);
	vertArray.set(0, vert.length/3, vert);
	//立方体的各个结点法线
	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);
//各个结点的纹理坐标
    short[] tex = {
	   1, 0, 0, 0, 1, 1, 0, 1,
	   1, 0, 0, 0, 1, 1, 0, 1,
	   1, 0, 0, 0, 1, 1, 0, 1,
	   1, 0, 0, 0, 1, 1, 0, 1,
	   1, 0, 0, 0, 1, 1, 0, 1,
	   1, 0, 0, 0, 1, 1, 0, 1 };
	 VertexArray texArray = new VertexArray(tex.length / 2, 2, 2);
	 texArray.set(0, tex.length/2, tex);
     int[] stripLen = { 4, 4, 4, 4, 4, 4 };
	 // 对象的VertexBuffer
	 VertexBuffer vb = vbuffer = new VertexBuffer();
	 vb.setPositions(vertArray, 1.0f, null);
	 vb.setNormals(normArray);
	 vb.setTexCoords(0, texArray, 1.0f, null);
	 indexbuffer = new TriangleStripArray( 0, stripLen );
	 //纹理图像
	 image = Image.createImage("/test.png" );
	 Image2D image2D = new Image2D( Image2D.RGB, image );
	 Texture2D texture = new Texture2D( image2D );
	 texture.setFiltering(Texture2D.FILTER_NEAREST,Texture2D.FILTER_NEAREST);
	 texture.setWrapping(Texture2D.WRAP_CLAMP,Texture2D.WRAP_CLAMP);
	 texture.setBlending(Texture2D.FUNC_MODULATE);
	 // 创建外观（Appearance）对象
	 appearance = new Appearance();
	 appearance.setTexture(0, texture);
	 appearance.setMaterial(material);
	 material.setColor(Material.DIFFUSE, 0xFFFFFFFF);
	 material.setColor(Material.SPECULAR, 0xFFFFFFFF);
	 material.setShininess(100.0f);
	 background.setColor(0xffffcc);
	 }
   protected void paint(Graphics g) {
	   graphics3d.bindTarget(g, true,
	   Graphics3D.DITHER | Graphics3D.TRUE_COLOR);
	   graphics3d.clear(background);
//设置照相机
Transform transform = new Transform();
transform.postTranslate(0.0f, 0.0f, 30.0f);
graphics3d.setCamera(camera, transform);
//设置灯光
graphics3d.resetLights();
graphics3d.addLight(light, transform);
//设置旋转
angle += 1.0f;
transform.setIdentity();
transform.postRotate(angle, 1.0f, 1.0f, 1.0f);
     graphics3d.render(vbuffer, indexbuffer, appearance,transform);
	 graphics3d.releaseTarget();
	 }
}