#include "stdafx.h"

#include <GL/glut.h>

void init()                                                              

{

    glClearColor (0.0, 0.0, 0.0, 0.0);

    glShadeModel (GL_FLAT);

}

void display()                    

{

    glTranslatef(10.0f, 10.0f, 0.0f);

    glClear (GL_COLOR_BUFFER_BIT);

    glColor3f (1.0, 0.0, 0.0);

    glBegin(GL_LINES);

      glVertex2f(0.0f, 0.0f); // origin of the line

      glVertex2f(580.0f, 0.0f); // ending point of the line

      glVertex2f(0.0f, 0.0f);

      glVertex2f(0.0f, 580.0f);

    glEnd( );

    glFlush ();      //forces previously issued commands to execute

}

void reshape (int w, int h)

{

    glViewport (0, 0, (GLsizei) w, (GLsizei) h);

    glMatrixMode (GL_PROJECTION);

    glLoadIdentity ();

    gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);

}

int main(int argc, char** argv)     //Because of glut, parameters are necessary

{

    glutInit(&argc, argv);

    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);    // | means or

    glutInitWindowSize (600, 600);       //set window size in pixels

    glutInitWindowPosition (100,100);    //set window position

    glutCreateWindow (argv[0]);          //create above window

    init ();                             //call init function

    glutDisplayFunc(display);            //etc.

    glutReshapeFunc(reshape);

    glutMainLoop();                      //must be last line of code - starts things

    return 0;

}