/*
 *  list.java
 *  This program demonstrates how to make and execute a 
 *  display list.  Note that attributes, such as current 
 *  color and matrix, are changed.
 */

import java.awt.Frame;
import java.io.IOException;
import java.lang.String;
import java.lang.System;

import jgl.GL;
import jgl.GLCanvas;

public class list extends GLCanvas {

    private int listName;

    private void myinit () {
    	listName = myGL.glGenLists (1);
	myGL.glNewList (listName, GL.GL_COMPILE);
            myGL.glColor3f (1.0f, 0.0f, 0.0f);	/* current color red */
            myGL.glBegin (GL.GL_TRIANGLES);
                myGL.glVertex2f (0.0f, 0.0f);
                myGL.glVertex2f (1.0f, 0.0f);
                myGL.glVertex2f (0.0f, 1.0f);
            myGL.glEnd ();
            myGL.glTranslatef (1.5f, 0.0f, 0.0f);/* move position */
        myGL.glEndList ();
        myGL.glShadeModel (GL.GL_FLAT);
    }

    private void drawLine () {
    	myGL.glBegin (GL.GL_LINES);
	    myGL.glVertex2f ( 0.0f, 0.5f);
	    myGL.glVertex2f (15.0f, 0.5f);
	myGL.glEnd ();
    }

    public void display () {
    	int i;

	myGL.glClear (GL.GL_COLOR_BUFFER_BIT);
	myGL.glColor3f (1.0f, 0.0f, 0.0f);	/* current color green */
	for (i = 0; i < 10; i++)		/* draw 10 triangles   */
	    myGL.glCallList (listName);
	drawLine ();	/* is this line green?  NO! */
			/* where is the line drawn? */
	myGL.glFlush ();
    }

    public void myReshape (int w, int h) {
	myGL.glViewport (0, 0, w, h);
	myGL.glMatrixMode (GL.GL_PROJECTION);
	myGL.glLoadIdentity ();
	if (w <= h) {
	    myGLU.gluOrtho2D (0.0, 2.0, -0.5 * (float)h/(float)w, 1.5 * (float)h/(float)w);
	} else {
	    myGLU.gluOrtho2D (0.0, 2.0 * (float)w/(float)h, -0.5, 1.5);
	}
	myGL.glMatrixMode (GL.GL_MODELVIEW);
	myGL.glLoadIdentity ();
    }

    /* ARGSUSED1 */
    public void keyboard (char key, int x, int y) {
	switch (key) {
	    case 27:
		System.exit(0);
	    default:
		break;
	}
    }

    /*
     *  Main Loop
     *  Open window with initial window size, title bar, 
     *  RGBA display mode, and handle input events.
     */
    public void init () {
	myUT.glutInitWindowSize (400, 50);
	myUT.glutInitWindowPosition (0, 0);
	myUT.glutCreateWindow (this);
	myinit ();
	myUT.glutReshapeFunc ("myReshape");
	myUT.glutDisplayFunc ("display");
	myUT.glutKeyboardFunc ("keyboard");
	myUT.glutMainLoop ();
    }

    static public void main (String args[]) throws IOException {
	Frame mainFrame = new Frame ();
	mainFrame.setSize (408, 77);
	list mainCanvas = new list ();
	mainCanvas.init();
	mainFrame.add (mainCanvas);
	mainFrame.setVisible (true);
    }

}