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 model 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 draw_triangle () {
	myGL.glBegin (GL.GL_LINE_LOOP);
	    myGL.glVertex2f (  0.0f,  25.0f);
	    myGL.glVertex2f ( 25.0f, -25.0f);
	    myGL.glVertex2f (-25.0f, -25.0f);
	myGL.glEnd ();
    }

    private void display () {
	myGL.glClearColor (0.0f, 0.0f, 0.0f, 1.0f);
	myGL.glClear (GL.GL_COLOR_BUFFER_BIT);

	myGL.glLoadIdentity ();
	myGL.glColor3f (1.0f, 1.0f, 1.0f);
	draw_triangle ();			/* solid lines */

	myGL.glEnable (GL.GL_LINE_STIPPLE);	/* dashed lines */
	myGL.glLineStipple (1, (short)0xF0F0);
	myGL.glLoadIdentity ();
	myGL.glTranslatef (-20.0f, 0.0f, 0.0f);
	draw_triangle ();

	myGL.glLineStipple (1, (short)0xF00F);	/* long dashed lines */
	myGL.glLoadIdentity ();
	myGL.glScalef (1.5f, 0.5f, 1.0f);
	draw_triangle ();

	myGL.glLineStipple (1, (short)0x8888);	/* dotted lines */
	myGL.glLoadIdentity ();
	myGL.glRotatef (90.0f, 0.0f, 0.0f, 1.0f);
	draw_triangle ();
	myGL.glDisable (GL.GL_LINE_STIPPLE);
	
	myGL.glFlush ();
    }

    private void myinit () {
	myGL.glShadeModel (GL.GL_FLAT);
    }

    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 (-50.0f, 50.0f,
                          -50.0f*(float)h/(float)w, 
                           50.0f*(float)h/(float)w, 
                           -1.0f, 1.0f);
        } else {
            myGL.glOrtho (-50.0f*(float)w/(float)h, 
                           50.0f*(float)w/(float)h, 
                          -50.0f, 50.0f,
                           -1.0f,  1.0f);
        }
        myGL.glMatrixMode (GL.GL_MODELVIEW);
    }

    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 auxIdleFunc(display)
	display ();
    }

}