//We should put comments here

#include <iostream>
#include <cstdlib>
#include "graphics.h"

using namespace std;

const int WINDOW_SIZE = 600;	//The size of the window that we use

int main()
{
	//Variable Declarations
	long total_points;		//The total number of points dropped in square
	long circle_points;		//How many points fell inside the circle
	int x, y;				//Pixel coordinates of a single point

	//Init graphics window
	initwindow(WINDOW_SIZE, WINDOW_SIZE, "Apple Pi");

	//Set up loop
	total_points = circle_points = 0;
	setfillstyle(SOLID_FILL, RED);
	fillellipse(WINDOW_SIZE/2, WINDOW_SIZE/2, WINDOW_SIZE/2, WINDOW_SIZE/2);

	//Loop
	while(! (kbhit()) )
	{
		//Drop a random point (2 random numbers from 0 to WINDOW_SIZE - 1)
		x = rand() % WINDOW_SIZE;
		y = rand() % WINDOW_SIZE;
		++total_points;

		//determine if it's in the circle
		if (getpixel(x, y) == RED)
		{
			++circle_points;
			putpixel(x, y, WHITE);
			delay(1000);
			putpixel(x, y, RED);
		}
		else
		{
			putpixel(x, y, WHITE);
			delay(1000);
			putpixel(x, y, BLACK);
		}

		//Print the value of pi (estimated)
		cout << "Pi estimate = " << 4.0 * circle_points / total_points
			<< " after " << total_points << " iterations." << endl;
	}
}