groovyとJOGLで市松模様の面を描画する

groovyとJOGLで市松模様の面を描画するには、以下のコードを実行します。

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

// 出力画像サイズ
width = 300
height = 300

GLDrawableFactory gldf =
 GLDrawableFactory.getFactory()
GLCapabilities glc = new GLCapabilities()
glc.setDoubleBuffered(false)
GLPbuffer buf = gldf.createGLPbuffer(
 glc, null, width, height, null)
GL gl = buf.getGL()

buf.addGLEventListener(
[ init: {
 // 背景色
 gl.glClearColor(
   0x77/0xff as Float,
   0x99/0xff as Float,
   0xff/0xff as Float,
   1f)
 },

 display: {
   GLUT glut = new GLUT()
   gl.glViewport(0, 0, width, height)

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

   gl.glMatrixMode(GL_MODELVIEW)
   gl.glLoadIdentity()
   gl.glTranslatef(-2.0f, -2.0f, -12.0f)

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

   gl.glPushMatrix()
   // X軸回転
   gl.glRotatef(-70.0f, 1.0f, 0.0f, 0.0f)

   tw = 0.4f
   th = 0.4f
   xs = 10
   ys = 10
   for(ly in 0..ys-1){
     for(lx in 0..xs-1){
       if( (lx+ly)%2 == 0 ){
         gl.glColor3f(
           0xf0/0xff as Float,
           0xf0/0xff as Float,
           0xf0/0xff as Float
         )
       } else {
         gl.glColor3f(
           0x40/0xff as Float,
           0x40/0xff as Float,
           0x40/0xff as Float
         )
       }
       gl.glRectf(lx*tw as Float,
         ly*th as Float,
         (lx+1)*tw as Float,
         (ly+1)*tw as Float)
     }
   }
   gl.glPopMatrix()
 },

 reshape: {},
 displayChanged: {}
] as GLEventListener
)
GLContext context =
 buf.createContext(null)
context.makeCurrent()
buf.display()
Screenshot.writeToFile(
 new File("sample1284a.png"),
 width, height, true)
context.release()
context.destroy()

出力画像(sample1284a.png)


動作環境
JDK1.6 Update14, Groovy 1.6.3, JOGL 1.1.1a

関連情報
groovyとJOGLのまとめ