#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdlib.h>

void init (void) 
{
  glClearColor (1.0, 1.0, 1.0, 0.0);

  glOrtho (0.0, 1.0, 0.0, 1.0, -1.0, 1.0);

  // Here lies the cause of my troubles
  glEnable (GL_LINE_SMOOTH);
  glEnable (GL_BLEND);
  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glHint (GL_LINE_SMOOTH_HINT, GL_NICEST);
}

void display (void)
{
  // Just draw a black line on white background
  glClear (GL_COLOR_BUFFER_BIT);
  glColor3f (0.0, 0.0, 0.0);

  glLineWidth (1);
  glBegin (GL_LINE_STRIP);
    glVertex3f (0.50, 0.0, 1.0);
    glVertex3f (0.51, 1.0, 0.0);
  glEnd ();
  glFlush ();
}

int main(int argc, char** argv)
{
  // Standard GLUT init
  glutInit (&argc, argv);
  glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
  glutInitWindowSize (250, 250); 
  glutInitWindowPosition (100, 100);
  glutCreateWindow ("hello");
  init ();
  glutDisplayFunc (display); 
  glutMainLoop ();

  return 0;
}