/*
 * DrawYellowSquare.cpp
 *
 *  Created on: Mar 1, 2013
 *      Author: debure
 */
// Simple program to draw a yellow square where the user clicks

#include <stdlib.h>
#include <stdio.h>
#include <GL/glut.h>


void display()
{
	// don't glClear here or previous square in erases each time a new one is drawn
    glFlush();
}


void init()
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0, 500.0, 500.0, 0.0);  // makes y right side up
    glMatrixMode(GL_MODELVIEW);
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);  // clear display at start-up
    glColor3f(1.0, 1.0, 1.0);
}


void mouse(int button, int state, int x, int y)
{

   if (button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
   {
      exit(0);

   }
   else if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
   {
	  // NOTE: x, y are in screen coordinates!! This affect size and y placement.
      glColor3f(1.0, 1.0, 0.0);
	  glRecti(x-10, y-10, x+10, y+10);  // draws a rectangle
	          // uses the input y without correction because glOrtho sets up direction
      glFlush();

   }


}


int main(int argc, char** argv)
{

	glutInit(&argc, argv);
	glutInitWindowSize(500,500);
	glutCreateWindow("simple");
	glutDisplayFunc(display);
	init();
	glutMouseFunc (mouse);
	glutMainLoop();

	return 0;


}