import java.applet.Applet;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;

// must import jgl.GL....
import jgl.GL;
import jgl.GLAUX;

public class drawf extends Applet
		   implements ComponentListener {
    // must use GL to use jGL.....
    // and use GLAUX to use the aux functions.....
    // remember to give GL to initialize GLAUX
    GL myGL = new GL ();
    GLAUX myAUX = new GLAUX (myGL);

//    public static final byte rasters [] = {
//    	0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
//	0xff, 0x00, 0xff, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
//	0xff, 0xc0, 0xff, 0xc0 };	

    private void myinit () {
	myGL.glPixelStorei (GL.GL_UNPACK_ALIGNMENT, 1);
	myGL.glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
    }

    private void display () {
	myGL.glClear (GL.GL_COLOR_BUFFER_BIT);
	myGL.glColor3f (1.0f, 1.0f, 1.0f);
	myGL.glRasterPos2f (20.5f, 20.5f);
	// myGL.glBitmap (10, 12, 0.0, 0.0, 12.0, 0.0, rasters);
	// myGL.glBitmap (10, 12, 0.0, 0.0, 12.0, 0.0, rasters);
	// myGL.glBitmap (10, 12, 0.0, 0.0, 12.0, 0.0, rasters);
	myGL.glFlush ();
    }

    public void componentMoved (ComponentEvent e) {}
    public void componentShown (ComponentEvent e) {}
    public void componentHidden (ComponentEvent e) {}

    public void componentResized (ComponentEvent e) {
	// get window width and height by myself
	myReshape (getSize ().width, getSize ().height);
	display ();
	repaint ();
    }

    private void myReshape (int w, int h) {
        myGL.glViewport (0, 0, w, h);
        myGL.glMatrixMode (GL.GL_PROJECTION);
        myGL.glLoadIdentity ();
	myGL.glOrtho (0, w, 0, h, -1.0, 1.0);
        myGL.glMatrixMode (GL.GL_MODELVIEW);
    }

    public void update (Graphics g) {
    	// skip the clear screen command....
	paint (g);
    }

    public void paint (Graphics g) {
    	// STRANGE if call display here, it will be never stoped
	myGL.glXSwapBuffers (g, this);
    }

    public void init () {
	myAUX.auxInitPosition (0, 0, 500, 500);
	myAUX.auxInitWindow (this);
	myinit ();

	// as call auxReshapeFunc()
	addComponentListener (this);
	myReshape (getSize ().width, getSize ().height);

	// call display as call auxMainLoop(display);
        display ();
    }
}