Trazos.java

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




public class Trazos extends JFrame implements GLEventListener
{
	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);
		setSize(500, 500);
		setVisible(true);
	}

	void run()
	{
		setSize(600, 600);
		setLocationRelativeTo(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
		//canvas.requestFocusInWindow();
	}

	public void init (GLAutoDrawable DRAW)
	{
		GL gl = DRAW.getGL();
		gl.glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		gl.glOrtho(-2.0, 7.0, -2.0, 7.0, 0.0, 1.0);
	}

	public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
	{
		GL gl = drawable.getGL();

		gl.glViewport(0, 0, w, h);
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		gl.glOrtho(-2.0, 7.0, -2.0, 7.0, 0.0, 1.0);
		gl.glMatrixMode(GL.GL_MODELVIEW);
		gl.glLoadIdentity();
	}

	public void display(GLAutoDrawable drawable)
	{
		GL gl = drawable.getGL();
		gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

		Trazo1(gl);
		Triangulo(gl);
		
		gl.glFlush();
	}


	void Trazo1(GL gl)
	{
		gl.glBegin(gl.GL_POLYGON);
		gl.glVertex2f(0.0f, 0.0f);
		gl.glVertex2f(0.0f, 3.0f);
		gl.glVertex2f(4.0f, 3.0f);
		gl.glVertex2f(6.0f, 1.5f);
		gl.glVertex2f(4.0f, 0.0f);
		gl.glEnd();
	}

	void Triangulo(GL gl)
	{
		
		gl.glBegin(gl.GL_TRIANGLES); // Drawing Triangles
		gl.glColor3f(1.0f,0.0f,0.0f); // Color Red
		gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top
		gl.glColor3f(0.0f,0.0f,1.0f);      // Color Blue
		gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
		gl.glColor3f(0.0f,1.0f,0.0f);      // Color Green
		gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
		gl.glEnd();
	}

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