mycanvas.java

3D J2ME 代码集合

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.m3g.*;
import javax.microedition.m3g.Camera;
// The custom Canvas that handles all of the 3D rendering 
 public class MyCanvas extends Canvas {
     private Graphics3D      iG3D;
     private Camera          iCamera;
     private Light           iLight;
     private float           iAngle = 0.0f;  // Starting angle for 3D object
     private Transform       iTransform = new Transform();
     private Background      iBackground = new Background();
     private VertexBuffer    iVb;            // Vertex positions, normals, colors, texcoords
     private IndexBuffer     iIb;            // Indices to VertexBuffer, forming tri-strips
     private Appearance      iAppearance;    // Material, texture, compositing, etc.
     private Material        iMaterial = new Material();
     private Image           iImage;
     private Image2D         backDrop;       // Holds background image
     private Transform       transform3D;
    // 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) {

                     RotatingCube.quitApp();   // exit the MIDlet
                 } // end if
             } // end commandAction()
         }); // end of arguments to setCommandListener()
         try {
             init();
         } // end try
         catch(Exception e) {
              e.printStackTrace();
         } // end catch
     } // end constructor
    // Initialization of all components required to make 3D scene
     private void init() throws Exception  {
        // Add the Exit command
        addCommand(new Command("Exit", Command.EXIT, 1));
        // Get the singleton Graphics3D instance
        iG3D = Graphics3D.getInstance();
        // Create a camera
        iCamera = new Camera();
        iCamera.setPerspective( 80.0f,                                   // field of view
                                (float)getWidth() / (float)getHeight(),  // aspectRatio
                                1.0f,                                    // near clipping plane
                                1000.0f );                               // far clipping plane
        // Create a light
        iLight = new Light();
        iLight.setColor( 0xffffff );         // White light
        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 faces
        // above. Each normal is perpendicular to the surface of the object at
        // the corresponding vertex. These are used in lighting computations.
        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. These specify the coordinates on a 2-D image
        // that will be painted onto a surface. The image is 128 by 128 pixels, but
        // we only use a portion of the image.
        short[] tex = { 96, 32,       64, 32,       96, 64,       64, 64,
                        64, 32,       32, 32,       64, 64,       32, 64,
                        64, 0,        32, 0,        64, 32,       32, 32,
                        32, 0,         0, 0,        32, 32,        0, 32,
                        32, 32,        0, 32,       32, 64,        0, 64,
                        96, 0,        64, 0,        96, 32,       64, 32 };
        // 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 );
        int[] stripLen = { 4, 4, 4, 4, 4, 4 };  // The length of each triangle strip
        // 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/128.0f), null  );    // 128-pixel scale, zero bias
        // Create the index buffer for the 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("/cubeface.png");
        //         iImage = Image.createImage("/cubeface.png");
        // Create the Image2D (we need this so we can make a Texture2D)
        Image2D image2D = new Image2D( Image2D.RGB, iImage );
        // Create the Texture2D and enable mipmapping
        // 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 );
        // Load image for the background
        iImage = Image.createImage("/backdrop.png");
        // iImage = Image.createImage("/backdrop.png");
        backDrop = new Image2D(Image2D.RGB, iImage);
        // Create the appearance
        iAppearance = new Appearance();
        iAppearance.setTexture( 0, texture ); // add the Texture2D to the Appearance
        iAppearance.setMaterial(iMaterial);
        iMaterial.setVertexColorTrackingEnable( true );     //Ttrack per-vertex colors
        iMaterial.setColor(Material.SPECULAR, 0xFFFFFFFF);  // Specular = white
        iMaterial.setShininess(100.0f);
        PolygonMode polygonMode = new PolygonMode(); // An Appearance component encapsulating polygon-level attributes
        polygonMode.setPerspectiveCorrectionEnable(true);
        polygonMode.setCulling(PolygonMode.CULL_BACK); // By using CULL_NONE all faces of the pyramid will be shown.
        polygonMode.setShading(PolygonMode.SHADE_SMOOTH); // use a smooth shading of the colors on the pyramid.
        polygonMode.setTwoSidedLightingEnable(true);
        polygonMode.setLocalCameraLightingEnable(false);
        iAppearance.setPolygonMode(polygonMode);
        // iBackground.setColor( 0x8833FF ); // set the background color
        iBackground.setImage( backDrop ); // Set the background image
        // Set up the camera in the desired position
        transform3D = new Transform();
        transform3D.postTranslate(0.0f, 0.0f, 50.0f);
        // Binds this light for immediate mode rendering. Otherwise it won't have an effect.
        iG3D.setCamera( iCamera, transform3D );
        // Set up a "headlight": a directional light shining from the direction of the camera.
        // Binds this camera for immediate mode rendering. Won't have an effect otherwise.
        iG3D.resetLights();
        iG3D.addLight(iLight, transform3D );
    } // end init() 
    // 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 boolean parameters indicate that z-buffering,
        //    dithering and true color rendering are enabled. Because render() is
        //    applied to a submesh (a vertex buffer and not a Group or World node),
        //    the cube is rendered in immediate mode.
        iG3D.bindTarget(g, true, Graphics3D.DITHER | Graphics3D.TRUE_COLOR);
        // Clear the color and depth buffers--which draws the background image
        iG3D.clear( iBackground );
        // Update our transform (this will give us a rotating cube)
        iTransform.postRotate(3.0f, 1.0f, 1.0f, 1.0f );  // rotate around this axis
        // Render our cube, immediate mode. 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.
        iG3D.render( iVb, iIb, iAppearance, iTransform );
        // Free the graphics object
        iG3D.releaseTarget();
    } // end paint()
     
 } // end class myCanvas