JOGLで複数の球の文字列を描画する

JOGLで複数の球の文字列を描画するには、以下のコードを実行します。

import java.io.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.media.opengl.*;
import com.sun.opengl.util.*;

public class JoglSample58
{
    // 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);
            }

            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(-6.0f, 1.0f, -35.0f);

                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();
                // X軸回転
                gl.glRotatef(70.0f, 1.0f, 0.0f, 0.0f);
                // Y軸回転
                gl.glRotatef(10.0f, 0.0f, 1.0f, 0.0f);

                // 面の色を設定
                gl.glColor3f(
                    (float)0x77/(float)0xff, 
                    (float)0x99/(float)0xff, 
                    (float)0xff/(float)0xff
                );

                /* 文字列描画用イメージを作成 */
                String message = "JOGL";
                Font font = new Font(Font.SANS_SERIF, 
                    Font.PLAIN, 10);
                FontRenderContext frc = new FontRenderContext(
                    new AffineTransform(), false, false);
                TextLayout layout = new TextLayout(
                    message, font, frc);

                BufferedImage img = new BufferedImage(
                    (int)layout.getBounds().getWidth(), 
                    (int)layout.getAscent() + 
                    (int)layout.getDescent(), 
                    BufferedImage.TYPE_INT_ARGB);

                Graphics2D gr = img.createGraphics();
                gr.setColor(new Color(0x00, 0x00, 0x00, 0x00));
                gr.fill(new Rectangle2D.Double(0,0,
                    img.getWidth(),img.getHeight()));
                /* 文字列を描画 */
                gr.setColor(new Color(0xff, 0xff, 0xff));
                gr.setFont(font);
                layout.draw(gr, 0, 
                    img.getHeight()-layout.getDescent());
                gr.dispose();

                float rs = 0.25f;
                float ds = 0.45f;
                for(int lz=0;lz<img.getHeight();lz++){
                    for(int lx=0;lx<img.getWidth();lx++){
                        gl.glPushMatrix();
                        gl.glTranslatef(ds*lx, 0f, ds*lz);
                        if( img.getRGB(lx, lz) != 0 ){
                            glut.glutSolidSphere(rs, 16, 16);
                        }
                        gl.glPopMatrix();
                    }
                }

                gl.glPopMatrix();
            }

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

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

        GLContext context =  buf.createContext(null);
        context.makeCurrent();
        buf.display();
        Screenshot.writeToFile(
            new File("sample1216a.png"), width, height, true);
        context.release();
        context.destroy();
    }
}

出力画像(sample1216a.png)


動作環境
JDK6 Upadate13, JOGL 1.1.1