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我有一個帶有GLCanvas的JFrame。當我調用JFrame的Component.printAll()
方法,然後將Graphics2D對象打印到PNG文件(使用BufferedImage和ImageIO.write()
)時,那麼printAll()
方法沒有抓住GLCanvas。 JFrame在png圖像上,但GLCanvas全是灰色的。JOGL:使用Component.printAll()在JFrame中截取GLCanvas不起作用
我錯過了什麼?
重現問題的示例代碼。運行代碼後查看生成的名爲「image.png」的png文件。你會看到除GLCanvas以外的所有東西。創建圖像的代碼片段位於構造函數的底部。
import com.sun.opengl.util.Animator;
import java.awt.Graphics2D;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.*;
import javax.imageio.ImageIO;
import javax.media.opengl.*;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;
public class JOGLTest implements GLEventListener {
GLU glu = new GLU();
JFrame frame = new JFrame("JOGL");
GLCanvas canvas = new GLCanvas();
public static void main(String[] args) {
JOGLTest joglTest = new JOGLTest();
}
public JOGLTest() {
canvas.addGLEventListener(this);
frame.add(canvas);
frame.setSize(500, 500);
final Animator animator = new Animator(canvas);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
new Thread(new Runnable() {
public void run() {
animator.stop();
System.exit(0);
}
}).start();
}
});
frame.setLocationRelativeTo(null);
frame.setVisible(true);
animator.start();
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(JOGLTest.class.getName()).log(Level.SEVERE, null, ex);
}
BufferedImage image = new BufferedImage(frame.getWidth(), frame.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
frame.printAll(g);
image.flush();
try {
ImageIO.write(image, "png", new File("image.png"));
} catch (IOException ex) {
Logger.getLogger(JOGLTest.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void init(GLAutoDrawable drawable) {
GL gl = drawable.getGL();
gl.setSwapInterval(1);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glShadeModel(GL.GL_SMOOTH);
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
GL gl = drawable.getGL();
GLU glu = new GLU();
if (height <= 0) {
height = 1;
}
final float h = (float) width/(float) height;
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(20.0f, h, 1.0, 550.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
private int eyeX = 0;
private int eyeY = 0;
private int eyeZ = 130;
private int centerX = 0;
public void display(GLAutoDrawable drawable) {
GL gl = drawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
glu.gluLookAt(eyeX, eyeY, eyeZ, centerX, 0.0, 0.0, 0.0, 1.0, -0.0);
gl.glBegin(GL.GL_LINES);
gl.glVertex2d(1, 1);
gl.glVertex2d(20, 20);
gl.glEnd();
gl.glFlush();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
}
}
我的openGL中缺少了很多常量。例如我看不到GL.GL_PROJECTION .....你可以指定你的版本 – jayunit100 2011-12-27 01:32:13