/********************************************************************
  File:         illusion.cc
  Author:       Dana Vrajitoru
  Project:      Optical illusion
  Last updated: January 23, 2017.

  Functions creating the content of the window

********************************************************************/

#include "glheader.h"
#include "illusion.h"
#include <cstdlib>
#include <iostream>
using namespace std;

// display an optical illusion that creates a lens effect by drawing
// lines from the sides of the window towards the center at increasing
// distances from each other
void lensIllusion(float gap, float color[], float width, float height)
{
    glColor3f(color[0], color[1], color[2]);
    glBegin(GL_LINES);
    glVertex2f(gap, 0); // vertical left
    glVertex2f(gap, height);
    glVertex2f(width-gap, 0); // vertical right
    glVertex2f(width-gap, height);
    glVertex2f(0, gap); // horizontal bottom
    glVertex2f(width, gap); 
    glVertex2f(0, height-gap); // horizontal top
    glVertex2f(width, height-gap); 
    glEnd();
}