#include < windows.h >     // use as needed for your system
#include < GL/Gl.h >
#include < GL/glut.h >


void myInit (void)
{
     glClearColor ( 1.0, 1.0, 1.0, 1.0 );
     glColor3f ( 1.0f, 0.0f, 0.0f );
     glPointSize ( 4.0 );             // glLineWidth
     glMatrixMode ( GL_PROJECTION );
     glLoadIdentity ( );
     gluOrtho2D ( 0.0, 400.0, 1.0, 400.0 );
//   same as glOrtho ( 0.0, 400.0, 1.0, 400.0, -1.0, 1.0 )

}


void myDisplay ( void )
{
     glClear ( GL_COLOR_BUFFER_BIT );
     glBegin ( GL_POINTS );           // or GL-LINES, GL_LINE_STRIP, GL_LINE_LOOP, GL_POLYGON,
                                      // GL_TRIANGLES, GL_TRINGLE_STRIP, GL_TRIANGLE_FAN

          glVertex2i ( 50, 100 );     // or glVertex2f, 3i, 3f
          glVertex2i ( 100, 150 );
          glVertex2i ( 150, 150 );
          glVertex2i ( 200, 100 );
          glVertex2i ( 150, 50 );
          glVertex2i ( 100, 50 );

     glEnd ( );
     glFlush ( );
}



void main ( int argc, char** argv )
{
     glutInit ( &argc, argv );
     glutInitDisplayMode ( GLUT_SINGLE | GLUT_RGB );
     glutInitWindowSize ( 400, 400 );
     glutInitWindowPosition ( 200, 100 );
     glutCreateWindow ( "window" );
     glutDisplayFunc ( myDisplay );
     myInit ( );
     glutMainLoop ( );
}

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All Rights Reserved