/** Draw the old CSE logo
*/ 

import javax.media.opengl.*;

public class CSELogo {
    static double[][] logodata = { // initial positions of cubes
	{2,2,2},{1,2,2},{2,2,1},{2,0,2},{0,2,2},{2,2,0},{1,0,2},{-1,2,2},{2,-1,2},
	{2,0,1},{2,2,-1},{2,-2,2},{0,0,2},{-2,2,2},{2,0,0},{2,2,-2},{1,2,-2},
	{1,-2,2},{-1,0,2},{-2,1,2},{2,-2,1},{2,0,-1},{-2,2,1},{0,-2,2},{-2,0,2},
	{2,-2,0},{2,0,-2},{-2,2,0},{2,-2,-1},{-2,2,-1},{-1,2,-2},{-1,-2,2},
	{-2,-2,2},{2,-2,-2},{-2,2,-2}};
    
    static double cuberadius = 0.35; // radius of cubes in logo
    
    //draw all the cubes in the logo
    public static void logo(GL gl) {
	for (int i=0; i < logodata.length; i++){
	    gl.glPushMatrix();
	    gl.glTranslated(logodata[i][0], logodata[i][1], logodata[i][2]);
	    gl.glScaled(cuberadius,cuberadius,cuberadius);
	    cube(gl);
	    gl.glPopMatrix();
	    
	}
    }    
    
    //data for one cube
    static float[][] cubeMats = { //face materials
	{0.4f, 0.0f, 0.0f, 1.0f}, //red
	{1.0f, 1.0f, 0.0f, 1.0f}, //yellow 
	{0.0f, 0.0f, 1.0f, 1.0f}  //blue
    };
    
    static double[][] vertices = { //cube vertices
	{1,1,1}, {1,1,-1}, {1,-1,1}, {1,-1,-1},
	{-1,1,1}, {-1,1,-1}, {-1,-1,1}, {-1,-1,-1}
    };

    static int[][] faces = {// the faces
	//first one is material index rest are vertex indices
	{0,  0,2,3,1}, //right
	{0,  4,5,7,6}, //left
	{1,  0,1,5,4}, //top
	{1,  2,6,7,3}, //bottom
	{2,  0,4,6,2}, //front
	{2,  1,3,7,5}  //back
    };
	
    static double[][] facenormals = {// normals to each face
	{1,0,0},
	{-1,0,0},
	{0,1,0},
	{0,-1,0},
	{0,0,1},
	{0,0,-1}
    };
	    
    static double[][] texCoord = {// texture coords for each face
	{0,0},
        {0,1},
        {1,1},
	{1,0}
    };

    //draw one cube - it has yellow, red and blue faces
    public static void cube(GL gl){
	for (int f = 0; f < faces.length; f++){
	    gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT_AND_DIFFUSE, cubeMats[faces[f][0]], 0);
	    gl.glBegin(GL.GL_POLYGON);
	    gl.glNormal3dv(facenormals[f], 0);
	    //gl.glNormal3d(1,0,0);
	    for (int i = 1; i < faces[f].length; i++){
		gl.glTexCoord2dv(texCoord[i-1],0);
		gl.glVertex3dv(vertices[faces[f][i]], 0);
	    }
	    
	    gl.glEnd();
	}
    }

}