/** 
 * A little toy program for showing students of COMP3421
 * the basics of 3D rendering. 
 *
 */

import java.awt.*;
import java.awt.event.*; 
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;


public class Toy1 extends Frame 
    implements GLEventListener, KeyListener
{

    GLCanvas glc;
    int aWidth = 400;
    int aHeight = 400;
    public static void main(String[] args){
    
        Toy1 t = new Toy1();
    }

    public Toy1(){
        super("Toy1");

	glc = new GLCanvas();

        glc.addGLEventListener(this);
        glc.addKeyListener(this);
        setLayout(new BorderLayout());
	add("Center", glc);
        setSize(aWidth,aHeight);
	setVisible(true);
    }
    
    /* The functions below are required because we are a GLEventListener.
       We could also have put them in another class and put that class in the
       addGLEventListener method above.
    */


    /** 
     * Executed exactly once to initialize the 
     * associated GLDrawable
     */ 

    public void init(GLAutoDrawable drawable) {
	GL gl = drawable.getGL();
	/** 
	 * Set the background colour when the GLDrawable 
	 * is cleared 
	 */ 
	gl.glClearColor( 1.0f, 1.0f, 1.0f, 1.0f ); //white

    }
    
    
    /** 
     * Executed if the associated GLDrawable is resized
     */ 
    public void reshape(GLAutoDrawable drawable, int x, int y,  int width, int height) {
	GL gl = drawable.getGL();
	GLU glu = new GLU();
        gl.glViewport(0, 0, width, height);
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glOrtho(-2, 2, -2, 2, -4, 4);
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glEnable(GL.GL_DEPTH_TEST);
    }

    /** This method handles the painting of the GLDrawable */
    
    public void display(GLAutoDrawable drawable) {
        float[] teapotMat = {0.2f, 0.9f, 0.2f, 0.5f}; // The material for the teapot. 

        float[] lightpos = {-4f, 0.0f, 4.0f, 1.0f}; // This is where the light source goes. 

	GL gl = drawable.getGL();
        // Tell it to use Gouraud shading.
        gl.glShadeModel(GL.GL_SMOOTH);
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

        // Switch on the light. 
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, lightpos, 0);
        gl.glEnable(GL.GL_LIGHTING);
        gl.glEnable(GL.GL_LIGHT0);

        // Set the material 
        gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT_AND_DIFFUSE, teapotMat, 0);

        gl.glPushMatrix();

        
        // Here are some random transformations to uncomment. 
        //gl.glTranslatef(-1.0f,-1.0f,-1.0f);
        gl.glRotatef(45, 1,0,0);
        //gl.glRotatef(-90, 1, 1,1);
        //gl.glScalef(0.5f,-1,1);


        // Draws a teapot ...
        GLUT glut = new GLUT();
	glut.glutSolidTeapot(1);

        
        gl.glPopMatrix();
    }

    
    public void keyTyped(KeyEvent evt){

    }

    public void keyReleased(KeyEvent evt){

    }

    public void keyPressed(KeyEvent evt){
        if(evt.getKeyChar() == 'q') dispose();
    }

    /** This method handles things if display depth changes */
    public void displayChanged(GLAutoDrawable drawable,
			       boolean modeChanged,
			       boolean deviceChanged){
    }
    
}