Trazos2.java

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



public class Trazos extends JFrame implements GLEventListener
{
	GLU glu = new GLU();
	GL gl;
	GLUT glut = new GLUT();

	public static void main(String[] args)
	{
		Trazos frame = new Trazos();
		frame.addWindowListener( new WindowAdapter() {
			public void windowClosed(WindowEvent e) { System.exit(0); }
			public void windowClosing(WindowEvent e) { windowClosed(e); }
	    	} );
	}

	public Trazos()
	{
		super("Trazos");
		GLCapabilities caps = new GLCapabilities();
		GLCanvas canvas = new GLCanvas(caps);
		canvas.addGLEventListener(this);

		add("Center", canvas);
		setBounds(200, 100, 500, 500);
		setVisible(true);
	}

	void run()
	{
		setSize(600, 600);
		setLocationRelativeTo(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
	}
	
	public void init (GLAutoDrawable DRAW)
	{
		gl = DRAW.getGL();
		gl.glClearColor (1.0f, 1.0f, 0.0f, 0.0f);
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		glu.gluPerspective(60.0, 1.0, 1.0, 100.0);
	}

	public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
	{
		gl.glViewport(0, 0, w, h);
		gl.glClearColor (1.0f, 1.0f, 0.0f, 0.0f);
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		glu.gluPerspective(60.0, 1.0, 1.0, 100.0);

	}

	public void display(GLAutoDrawable drawable)
	{
		gl.glPushMatrix();
		gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
		
		gl.glDepthFunc(GL.GL_LEQUAL);
		gl.glEnable(GL.GL_DEPTH_TEST);
		gl.glClearDepth(1.0);
		gl.glTranslated(0.0, 0.0, -15.0);

		gl.glBegin(gl.GL_TRIANGLES); // Drawing Triangles
			gl.glColor3f(1.0f,0.0f,0.0f); gl.glVertex3f( 0.0f, 5.0f, 0.0f); // Top
			gl.glColor3f(0.0f,1.0f,0.0f);	gl.glVertex3f(-7.0f,-5.0f, 0.0f); // Bottom Left
			gl.glColor3f(0.0f,0.0f,1.0f);	gl.glVertex3f( 7.0f,-5.0f, 0.0f); // Bottom Right
		gl.glEnd();

		gl.glBegin(gl.GL_QUADS);
			gl.glColor3d(0.0, 1.0, 1.0);
			gl.glVertex3d(-5.0, 5.0, -5.0);	// (superior-izquierda)
			gl.glVertex3d(-5.0, -5.0, 5.0);	// (inferior-izquierda)
			gl.glVertex3d(5.0, -5.0, 5.0);	// (inferior-derecha)
			gl.glVertex3d(5.0, 5.0, -5.0);	// (superior-derecha)
		gl.glEnd();
		gl.glPopMatrix();
		gl.glFlush();
	}

	public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged){   }
}