Thursday, July 23, 2009

JOGLで立方体の市松模様を描画する

JOGLで立方体の市松模様を描画するには、以下のコードを実行します。


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

public class JoglSample28
{
// 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)0x77/(float)0xff,
(float)0x99/(float)0xff,
(float)0xff/(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(-4.0f, -6.0f, -25.0f);

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(30.0f, 1.0f, 0.0f, 0.0f);
// Y軸回転
gl.glRotatef(35.0f, 0.0f, 1.0f, 0.0f);

float cs = 0.4f;
float gs = 0.5f;
int xs = 20;
int ys = 20;
for(int ly=0;ly<ys;ly++){
for(int lx=0;lx<xs;lx++){
if( (lx+ly)%2 == 0 ){
gl.glColor3f(
(float)0xff/(float)0xff,
(float)0xff/(float)0xff,
(float)0xff/(float)0xff
);
} else {
gl.glColor3f(
(float)0xe0/(float)0xff,
(float)0xb0/(float)0xff,
(float)0x40/(float)0xff
);
}
gl.glTranslatef(gs, 0.0f, 0.0f);
glut.glutSolidCube(cs);
}
gl.glTranslatef(-gs*xs, gs, 0.0f);
}

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("sample1186a.png"), width, height, true);
context.release();
context.destroy();
}
}


出力画像(sample1186a.png)
JOGLで描画した市松模様に配置した立方体

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