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

  Interface functions for the program.

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

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

int winWidth = 300, winHeight = 200;

// some colors to play with
float black[3] = {0.0, 0.0, 0.0};
float white[3] = {1.0, 1.0, 1.0};
float red[3]   = {1.0, 0.0, 0.0};
float green[3] = {0.0, 1.0, 0.0};
float blue[3]  = {0.0, 0.0, 1.0};
float purple[3] = {0.8, 0.0, 1.0};

// Create a window and set up the GUI functions
void createWindowGUI()
{
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
    glutInitWindowSize(winWidth, winHeight);
    glutCreateWindow("Homework 2");
    glutDisplayFunc(display);
    glutReshapeFunc(myResize);
    //glutIdleFunc(display);
    glutKeyboardFunc(key);
    glutSpecialFunc(spkey);
    //glutMouseFunc(mouse);
}

// Defining some of the application parameters
void myinit()
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, winWidth, 0, winHeight);
    glMatrixMode(GL_MODELVIEW);
    glClearColor (purple[0], purple[1], purple[2], 1.0);
    glColor3f(1.0, 0.0, 0.0);
    glLineWidth(2);
}

// To be called whenever the window is resized.
void myResize(int w, int h)
{
    winWidth = w;
    winHeight = h;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, winWidth, 0, winHeight);
    glMatrixMode(GL_MODELVIEW);
}

// Callback function for redrawing the window 
void display(void)
{
    // set the background in the color we want
    glClear(GL_COLOR_BUFFER_BIT);
    glClearColor (purple[0], purple[1], purple[2], 1.0);

    // draw the illution
    lensIllusion(5, white, winWidth, winHeight);

    // send the content of the view buffer to the window
    glFlush();
}

// Callback function for an Ascii key being pressed
void key(unsigned char key, int x, int y)
{
    switch (key) {
    case 'q':
    case 'Q':
        exit(0);
    case ' ':
        glutPostRedisplay();
        break;
    }
}

// Callback function for a special key being pressed
void spkey(int key, int x, int y)
{
    switch (key) {
    case GLUT_KEY_LEFT:
        glutPostRedisplay();
        break;
    case GLUT_KEY_RIGHT:
        glutPostRedisplay();
        break;
    }
}