Cubo

#include <gl\glut.h>

void myinit(void)
{/* attributes */
glClearColor(1.0, 1.0, 1.0, 1.0); /* white background */

glColor3f(1.0, 0.0, 0.0); /* draw in red */

/* set up viewing */

/* 500 x 500 window with origin lower left */

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, 500.0, 0.0, 500.0);
glMatrixMode(GL_MODELVIEW);
}
void display(void)
{       
  typedef GLfloat point2[2];
  point2 vertice[8] = {{100.0,100.0},{300.0,100.0},{300.0,300.0},{100.0,300.0},{400.0,200.0},{400.0,400.0},{200.0,400.0},{200.0,200.0}};  
 
  glColor3f(1.0,0.0,0.0);
  gluOrtho2D(0.0, 500.0, 0.0, 500.0);
  glClear(GL_COLOR_BUFFER_BIT);
  glBegin(GL_LINES);
  glVertex2fv(vertice[0]);
  glVertex2fv(vertice[1]);
  glVertex2fv(vertice[1]);
  glVertex2fv(vertice[2]);
  glVertex2fv(vertice[2]);
  glVertex2fv(vertice[3]);
  glVertex2fv(vertice[3]);
  glVertex2fv(vertice[0]);
  glVertex2fv(vertice[1]);
  glVertex2fv(vertice[4]);
  glVertex2fv(vertice[2]);
  glVertex2fv(vertice[5]);
  glVertex2fv(vertice[5]);
  glVertex2fv(vertice[4]);
  glVertex2fv(vertice[5]);
  glVertex2fv(vertice[6]);
  glVertex2fv(vertice[6]);
  glVertex2fv(vertice[3]);
  glVertex2fv(vertice[0]);
  glVertex2fv(vertice[7]);
  glVertex2fv(vertice[4]);
  glVertex2fv(vertice[7]);
  glVertex2fv(vertice[6]);
  glVertex2fv(vertice[7]);
  glEnd();
        glFlush();
}


void main(int argc, char** argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
        glutInitWindowSize(512, 512);
        glutCreateWindow("Cubo  en 2D");
        glutDisplayFunc(display);
 
        glutMainLoop();      
}