import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;

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

public class light 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);

    private void myinit () {
	float mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
	float mat_shininess[] = { 50.0f };
	float light_position[] = { 1.0f, 1.0f, 1.0f, 0.0f };

	myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, mat_shininess);
	myGL.glLightfv (GL.GL_LIGHT0, GL.GL_POSITION, light_position);

	myGL.glEnable (GL.GL_LIGHTING);
	myGL.glEnable (GL.GL_LIGHT0);
	myGL.glDepthFunc (GL.GL_LEQUAL);
	myGL.glEnable (GL.GL_DEPTH_TEST);
    }

    private void display () {
	myGL.glClear (GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
	myAUX.auxSolidSphere (1.0);
	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 ();
        if (w <= h) {
            myGL.glOrtho (-1.5f,   1.5f, 
	    		  -1.5f*(float)h/(float)w, 
			   1.5f*(float)h/(float)w,
			  -10.0f, 10.0f);
        } else {
            myGL.glOrtho ( -1.5f*(float)w/(float)h,
	    		    1.5f*(float)w/(float)h,
			   -1.5f,  1.5f,
			  -10.0f, 10.0f);
        }
        myGL.glMatrixMode (GL.GL_MODELVIEW);
	myGL.glLoadIdentity ();
    }

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

    public void paint (Graphics g) {
	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 ();
    }

}