meshtool.java

一个旋转的四棱锥

/*****************************************************************************

 Description: The  MeshTool class. Used to create figures.

 Created By: Oscar Vivall 2006-06-12
 @file        MeshTool.java

 COPYRIGHT All rights reserved Sony Ericsson Mobile Communications AB 2004.
 The software is the copyrighted work of Sony Ericsson Mobile Communications AB.
 The use of the software is subject to the terms of the end-user license 
 agreement which accompanies or is included with the software. The software is 
 provided "as is" and Sony Ericsson specifically disclaim any warranty or 
 condition whatsoever regarding merchantability or fitness for a specific 
 purpose, title or non-infringement. No warranty of any kind is made in 
 relation to the condition, suitability, availability, accuracy, reliability, 
 merchantability and/or non-infringement of the software provided herein.

 *****************************************************************************/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.m3g.*;
import javax.microedition.m3g.Camera;

public class MeshTool {
    
    public static Mesh createMesh(){
        short POINTS[] = new short[] {0, 10, -2,
                                      0, 10, 2,
                                      
                                      -5, 0, -2,
                                      -5, 0, 2,
                                      
                                      5, 0, -2,
                                      5, 0, 2,

                                      -2, 0, -2,
                                      -2, 0, 2,
                                      
                                      2, 0, -2,
                                      2, 0, 2,
                                      
                                      -2, -10, -2,
                                      -2, -10, 2,
                                      
                                      2, -10, -2,
                                      2, -10, 2};

        byte COLOR[] = new byte[] {127, 127,127,
                                            127, 0, 0,
                                            0, 127, 0,
                                            0, 0, 127,
                                            127, 127, 0,
                                            0, 127, 127,
                                            127, 0, 127,
                                            0, 127, 0,
                                            127, 0, 0,
                                            0, 127, 0,
                                            0, 0, 127,
                                            127, 127, 0,
                                            0, 127, 127,
                                            127, 0, 127};

        int INDICES[] = {0, 1, 2, 3, 4, 5, 0, 1,
                         6, 7, 8, 9, 12, 13, 10, 11, 6, 7,
                         0, 2, 4,
                         1, 3, 5,
                         6, 8, 10, 12,
                         7, 9, 11, 13};

        int[] LENGTHS = new int[] {8, 10, 3, 3, 4, 4};

        VertexArray POSITIONS_ARRAY, TEXTURE_ARRAY, COLOR_ARRAY;
        IndexBuffer INDEX_BUFFER ;
        float textureRepeat;

        // initialize the common arrays
        POSITIONS_ARRAY = new VertexArray(POINTS.length, 3, 2);
        POSITIONS_ARRAY.set(0, POINTS.length/3, POINTS);
        COLOR_ARRAY = new VertexArray(COLOR.length, 3, 1);
        COLOR_ARRAY.set(0, COLOR.length / 3, COLOR);
        INDEX_BUFFER = new TriangleStripArray(INDICES, LENGTHS);

        VertexBuffer vertexBuffer = new VertexBuffer();
        vertexBuffer.setPositions(POSITIONS_ARRAY, 1.0f, null);
        vertexBuffer.setColors(COLOR_ARRAY);
        Mesh mesh = new Mesh(vertexBuffer, INDEX_BUFFER, null);

        Appearance appearance = new Appearance();

        PolygonMode polygonMode = new PolygonMode();
        polygonMode.setPerspectiveCorrectionEnable(true);
        polygonMode.setShading(PolygonMode.SHADE_FLAT);
        polygonMode.setCulling(PolygonMode.CULL_NONE);

        appearance.setPolygonMode(polygonMode);
        mesh.setAppearance(0, appearance);
        return mesh;
    }

    public static Mesh createPlane(short size){
//        short size=50;
        
        short []POINTS = new short[] {size, 0, (short)-size,
                                      (short)-size, 0, (short)-size,
                                      (short)-size, 0, size,
                                      size, 0, size};

        byte []COLOR = new byte[] {127, 127, 127,
                                127, 127, 127,
                                127, 127, 127,
                                127, 127, 127,};
                                
        short []TEXTURE = new short[] {1, 0,
                                      0, 0,
                                      0, 1,
                                      1, 1};
                                

        int []INDICES = new int[] {0,1,3,2};
        int []LENGTHS = new int[] {4};

        VertexArray POSITIONS_ARRAY, TEXTURE_ARRAY, COLOR_ARRAY; 
        IndexBuffer INDEX_BUFFER;
        float textureRepeat;

        // initialize the common arrays
        POSITIONS_ARRAY = new VertexArray(POINTS.length/3, 3, 2); 
        POSITIONS_ARRAY.set(0, POINTS.length/3, POINTS); 
        COLOR_ARRAY = new VertexArray(COLOR.length/3, 3, 1);
        COLOR_ARRAY.set(0, COLOR.length / 3, COLOR);
        TEXTURE_ARRAY = new VertexArray(TEXTURE.length/2, 2, 2);
        TEXTURE_ARRAY.set(0, TEXTURE.length/2, TEXTURE);
        INDEX_BUFFER = new TriangleStripArray(INDICES, LENGTHS);

        VertexBuffer vertexBuffer = new VertexBuffer(); 
        vertexBuffer.setPositions(POSITIONS_ARRAY, 1.0f, null); 
//        vertexBuffer.setColors(COLOR_ARRAY);
        vertexBuffer.setTexCoords(0, TEXTURE_ARRAY, 1.0f, null);
        Mesh mesh = new Mesh(vertexBuffer, INDEX_BUFFER, null); 

        Appearance appearance = new Appearance();

        PolygonMode polygonMode = new PolygonMode();
        polygonMode.setPerspectiveCorrectionEnable(true);
//        polygonMode.setShading(PolygonMode.SHADE_FLAT);
        polygonMode.setCulling(PolygonMode.CULL_NONE);

        appearance.setPolygonMode(polygonMode);

        CompositingMode cm = new CompositingMode();
        cm.setBlending(CompositingMode.ALPHA);
        appearance.setCompositingMode(cm);
        
        Texture2D texture = null;
        try{
            Image texImg = Image.createImage("/coord64.png"); // Load the image
            texture = new Texture2D(new Image2D(Image2D.RGBA, texImg)); // create the texture from the image
            texture.setWrapping(Texture2D.WRAP_CLAMP, Texture2D.WRAP_CLAMP); // don't repeat the texture.
            texture.setBlending(Texture2D.FUNC_MODULATE);
            texture.setFiltering(Texture2D.FILTER_LINEAR, Texture2D.FILTER_LINEAR);
        }catch(Exception e){
            e.printStackTrace();
        }
        appearance.setTexture(0, texture);

        mesh.setAppearance(0, appearance);
        return mesh;
    }
}