imagesquare.java

3D手机游戏开发实例源代码 3D迷宫游戏的演示程序

import javax.microedition.m3g.*;


public class ImageSquare 
{
  private Mesh imMesh;


  public ImageSquare(Image2D bbImage, float x, float y, float z, float size) 
  { 
    // build the mesh
    VertexBuffer vertexbuffer = makeGeometry();

    int[] INDICES = {1,2,0,3};  // one quad
    int[] LENGTH = {4};
    IndexBuffer indexbuffer = new TriangleStripArray(INDICES, LENGTH);

    Appearance appearance = makeAppearance(bbImage);

    imMesh = new Mesh(vertexbuffer, indexbuffer, appearance);

    // scale and position the mesh
    float scale2 = size * 0.5f;   // to reduce 2 by 2 image to 1 by 1
    imMesh.scale(scale2, scale2, scale2);
    imMesh.setTranslation(x, y, z);
  }  // end of ImageSquare()


  private VertexBuffer makeGeometry()
  /*  A square centered at the origin on the XZ plane
      with sides of 2 units. No normals. */
  {
    // create vertices
    short[] POINTS = {-1,-1,0,  1,-1,0,  1,1,0,  -1,1,0};
    VertexArray POSITION_ARRAY = new VertexArray(POINTS.length/3, 3, 2);
    POSITION_ARRAY.set(0, POINTS.length/3, POINTS);

    // create texture coordinates
    short[] TEXCOORDS = {0,1,  1,1,  1,0,  0,0};
    VertexArray TEXCOORD_ARRAY = new VertexArray(TEXCOORDS.length/2, 2, 2);
    TEXCOORD_ARRAY.set(0, TEXCOORDS.length/2, TEXCOORDS);

    VertexBuffer vertexbuffer = new VertexBuffer(); 
    vertexbuffer.setPositions(POSITION_ARRAY, 1.0f, null); // no scale, bias
    vertexbuffer.setTexCoords(0, TEXCOORD_ARRAY, 1.0f, null);

    return vertexbuffer;
  }  // end of makeGeometry()


  private Appearance makeAppearance(Image2D bbImage)
  // The appearance comes from the transparent texture in bbImage.
  {
    Appearance appearance = new Appearance();

    // only display the opaque parts of the texture
    CompositingMode compositingmode = new CompositingMode();
    compositingmode.setBlending(CompositingMode.ALPHA);
    appearance.setCompositingMode(compositingmode);

    if (bbImage != null) {
      Texture2D texture = new Texture2D(bbImage);
      texture.setFiltering(Texture2D.FILTER_NEAREST, Texture2D.FILTER_NEAREST);
      texture.setWrapping(Texture2D.WRAP_CLAMP, Texture2D.WRAP_CLAMP);
      texture.setBlending(Texture2D.FUNC_REPLACE); 
                // the texture's colours and alpha replace the mesh's
      appearance.setTexture(0, texture);
    }
    return appearance;
  }  // end of makeAppearance()


  // -------------------- access method ----------------------

  public Mesh getImageSquareMesh()
  {  return imMesh;  }

} // end of ImageSquare Class