JOGLで樽の形を描画する

JOGLで樽の形を描画するには、以下のコードを実行します。

import java.io.*;
import javax.media.opengl.*;
import com.sun.opengl.util.*;
import com.sun.opengl.util.texture.*;

public class JoglSample31
{
   // 出力画像サイズ
   private static int width = 300;
   private static int height = 300;

   public static void main(String args[])
       throws IOException
   {
       GLDrawableFactory gldf =
           GLDrawableFactory.getFactory();
       GLCapabilities glc = new GLCapabilities();
       glc.setDoubleBuffered(false);
       GLPbuffer buf = gldf.createGLPbuffer(
          glc, null, width, height, null);

       buf.addGLEventListener(
           new GLEventListener(){
           // 初期化
           public void init(GLAutoDrawable dr)
           {
               GL gl = dr.getGL();
               // 背景色
               gl.glClearColor(
                   (float)0xf0/(float)0xff,
                   (float)0xf0/(float)0xff,
                   (float)0xf0/(float)0xff,
                   1f);

               try
               {
               Texture texture = TextureIO.newTexture(
                   new File("sf.jpg"), true);
               texture.enable();
               texture.bind();
               }
               catch(IOException ioex){}

           }

           public void display(GLAutoDrawable dr)
           {
               GL gl = dr.getGL();
               GLUT glut = new GLUT();
               gl.glViewport(0, 0, width, height);

               // 透視投影
               gl.glMatrixMode(GL.GL_PROJECTION);
               gl.glLoadIdentity();
               float ratio = (float)height/(float)width;
               gl.glFrustum(-1.0f, 1.0f, -ratio, ratio,
                   5.0f, 40.0f);

               gl.glMatrixMode(GL.GL_MODELVIEW);
               gl.glLoadIdentity();
               gl.glTranslatef(0.0f, 0.0f, -10.0f);

               gl.glEnable(GL.GL_LIGHTING);
               gl.glEnable(GL.GL_LIGHT0);
               gl.glEnable(gl.GL_COLOR_MATERIAL);
               gl.glEnable(GL.GL_NORMALIZE);
               gl.glEnable(GL.GL_DEPTH_TEST);
//                gl.glEnable(GL.GL_CULL_FACE);
               gl.glClear(GL.GL_COLOR_BUFFER_BIT |GL.GL_DEPTH_BUFFER_BIT );

               gl.glPushMatrix();
               // 面の色を設定
               gl.glColor3f(
                   (float)0x77/(float)0xff,
                   (float)0x99/(float)0xff,
                   (float)0xff/(float)0xff
               );
               // X軸回転
               gl.glRotatef(30.0f, 1.0f, 0.0f, 0.0f);
               // Y軸回転
               gl.glRotatef(50.0f, 0.0f, 1.0f, 0.0f);
               //
               double minr = 0.7f;
               double maxr = 1.0f;
               int slices = 16;
               double lr=2*Math.PI/slices;
               double dh = 0.5;
               double th = 2.5;

               double cx[] = new double[slices];
               double cy[] = new double[slices];

               for(int li=0;li<slices;li++){
                   double x1 = minr*Math.cos(lr*(li+1));
                   double y1 = minr*Math.sin(lr*(li+1));
                   double x2 = maxr*Math.cos(lr*(li+1));
                   double y2 = maxr*Math.sin(lr*(li+1));
                   double x3 = maxr*Math.cos(lr*li);
                   double y3 = maxr*Math.sin(lr*li);
                   double x4 = minr*Math.cos(lr*li);
                   double y4 = minr*Math.sin(lr*li);
                   cx[li] = x4;
                   cy[li] = y4;
                   drawQuads(gl,
                     x4, y4, -th/2,
                     x3, y3, -th/2+dh,
                     x2, y2, -th/2+dh,
                     x1, y1, -th/2);

                   drawQuads(gl,
                     x2, y2, -th/2+dh,
                     x3, y3, -th/2+dh,
                     x3, y3, th/2-dh,
                     x2, y2, th/2-dh);

                   drawQuads(gl,
                     x1, y1, th/2,
                     x2, y2, th/2-dh,
                     x3, y3, th/2-dh,
                     x4, y4, th/2);
               }

               gl.glBegin(GL.GL_POLYGON);
               gl.glNormal3d(0,0,-1);
               for(int li=0;li<slices;li++){
                 gl.glVertex3d(cx[li], cy[li], -th/2);
               }
               gl.glEnd();

               gl.glBegin(GL.GL_POLYGON);
               gl.glNormal3d(0,0,1);
               for(int li=0;li<slices;li++){
                 gl.glVertex3d(cx[li], cy[li], th/2);
               }
               gl.glEnd();

               gl.glPopMatrix();
           }

           public void reshape(
               GLAutoDrawable dr,
               int x, int y,
               int width, int height){}

           public void displayChanged(
               GLAutoDrawable dr,
               boolean modeChanged,
               boolean deviceChanged){}

           private void drawQuads(GL gl,
               double p1x, double p1y, double p1z,
               double p2x, double p2y, double p2z,
               double p3x, double p3y, double p3z,
               double p4x, double p4y, double p4z)
           {
               gl.glBegin(GL.GL_QUADS);

               gl.glNormal3d(p1x, p1y, p1z);
               gl.glVertex3d(p1x, p1y, p1z);
               gl.glNormal3d(p2x, p2y, p2z);
               gl.glVertex3d(p2x, p2y, p2z);
               gl.glNormal3d(p3x, p3y, p3z);
               gl.glVertex3d(p3x, p3y, p3z);
               gl.glNormal3d(p4x, p4y, p4z);
               gl.glVertex3d(p4x, p4y, p4z);

               gl.glEnd();
           }
         }
       );

       GLContext context =  buf.createContext(null);
       context.makeCurrent();
       buf.display();
       Screenshot.writeToFile(
           new File("sample1189a.png"), width, height, true);
       context.release();
       context.destroy();
   }
}

出力画像(sample1189a.png)


動作環境
JDK6 Upadate13, JOGL 1.1.1