j2me 3D游戏样例

package manually; import javax.microedition.lcdui.*; import javax.microedition.m3g.*; public class MyCanvas extends Canvas { private Graphics3D iG3D; private Camera iCamera; private Light iLight; private float iAngle = 0.0f; private Transform iTransform = new Transform(); private Background iBackground = new Background(); private VertexBuffer iVb; // positions, normals, colors, texcoords private IndexBuffer iIb; // indices to iVB, forming triangle strips private Appearance iAppearance; // material, texture, compositing, ... private Material iMaterial = new Material(); private Image iImage; /** * Construct the Displayable. */ public MyCanvas() { // set up this Displayable to listen to command events setCommandListener(new CommandListener() { public void commandAction(Command c, Displayable d) { if (c.getCommandType() == Command.EXIT) { //退出程序 MIDletMain.quitApp(); } } }); try { init(); } catch(Exception e) { e.printStackTrace(); } } /** * Component initialization. */ private void init() throws Exception { //添加 Exit 命令按钮 addCommand(new Command("Exit", Command.EXIT, 1)); //获得 Graphics3D 接口 iG3D = Graphics3D.getInstance(); //创建一个 camera对象 iCamera = new Camera(); iCamera.setPerspective( 60.0f, // field of view (float)getWidth()/ (float)getHeight(), // aspectRatio 1.0f, // near clipping plane 1000.0f ); // far clipping plane //创建一个 light对象 iLight = new Light(); iLight.setColor(0xffffff); // 设置为白色光线t iLight.setIntensity(1.25f); // overbright // init some arrays for our object (cube) // Each line in this array declaration represents a triangle strip // for one side of a cube. The only primitive we can draw with is the // triangle strip so if we want to make a cube with hard edges we // need to construct one triangle strip per face of the cube. // 1 * * * * * 0 // * * * // * * * // * * * // 3 * * * * * 2 // The ASCII diagram above represents the vertices in the first line // (the first tri-strip) short[] vert = { 10, 10, 10, -10, 10, 10, 10,-10, 10, -10,-10, 10, // front -10, 10,-10, 10, 10,-10, -10,-10,-10, 10,-10,-10, // back -10, 10, 10, -10, 10,-10, -10,-10, 10, -10,-10,-10, // left 10, 10,-10, 10, 10, 10, 10,-10,-10, 10,-10, 10, // right 10, 10,-10, -10, 10,-10, 10, 10, 10, -10, 10, 10, // top 10,-10, 10, -10,-10, 10, 10,-10,-10, -10,-10,-10 }; // bottom // create a VertexArray to hold the vertices for the object VertexArray vertArray = new VertexArray(vert.length / 3, 3, 2); vertArray.set(0, vert.length/3, vert); // The per-vertex normals for the cube; these match with the vertices // above. Each normal is perpendicular to the surface of the object at // the corresponding vertex.垂直相应的顶点 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 }; // create a vertex array for the normals of the object VertexArray normArray = new VertexArray(norm.length / 3, 3, 1); normArray.set(0, norm.length/3, norm); // per vertex texture coordinates 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 }; // create a vertex array for the texture coordinates of the object VertexArray texArray = new VertexArray(tex.length / 2, 2, 2); texArray.set(0, tex.length/2, tex); // the length of each triangle strip int[] stripLen = { 4, 4, 4, 4, 4, 4 }; // create the VertexBuffer for our object VertexBuffer vb = iVb = new VertexBuffer(); vb.setPositions(vertArray, 1.0f, null); // unit scale, zero bias vb.setNormals(normArray); vb.setTexCoords(0, texArray, 1.0f, null); // unit scale, zero bias // create the index buffer for our object (this tells how to // create triangle strips from the contents of the vertex buffer). iIb = new TriangleStripArray( 0, stripLen ); // load the image for the texture iImage = Image.createImage( "/texture.png" ); // create the Image2D (we need this so we can make a Texture2D) Image2D image2D = new Image2D( Image2D.RGB, iImage ); // create the Texture2D // texture color is to be modulated with the lit material color 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); // create the appearance iAppearance = new Appearance(); iAppearance.setTexture(0, texture); iAppearance.setMaterial(iMaterial); iMaterial.setColor(Material.DIFFUSE, 0xFFFFFFFF); // white iMaterial.setColor(Material.SPECULAR, 0xFFFFFFFF); // white iMaterial.setShininess(100.0f); iBackground.setColor(0xffffcc); // set the background color } /** * Paint the scene. */ protected void paint(Graphics g) { // Bind the Graphics of this Canvas to our Graphics3D. The // viewport is automatically set to cover the entire clipping // rectangle of the Graphics object. The parameters indicate // that z-buffering, dithering, and true color rendering are // enabled, but antialiasing is disabled. iG3D.bindTarget(g, true, Graphics3D.DITHER | Graphics3D.TRUE_COLOR); // clear the color and depth buffers iG3D.clear(iBackground); // set up the camera in the desired position Transform transform = new Transform(); transform.postTranslate(0.0f, 0.0f, 30.0f); iG3D.setCamera(iCamera, transform); // set up a "headlight": a directional light shining // from the direction of the camera iG3D.resetLights(); iG3D.addLight(iLight, transform); // update our transform (this will give us a rotating cube) iAngle += 1.0f; iTransform.setIdentity(); iTransform.postRotate(iAngle, // rotate 1 degree per frame 1.0f, 1.0f, 1.0f); // rotate around this axis // Render our cube. We provide the vertex and index buffers // to specify the geometry; the appearance so we know what // material and texture to use; and the transform to tell // where to render the object i