HELP

#include <SFML\Graphics.hpp>
#include <SFML\Main.hpp>
#include <SFML\Window.hpp>
#include <SFML\System.hpp>

int main()
{
	sf::RenderWindow window;
	sf::Event event;
	const int LIGHT_NUMBER_OF_VERTECES = 25;
	window.create(sf::VideoMode(500, 500), "", sf::Style::Default);
	
	sf::VertexArray vertexArr(sf::TrianglesFan, LIGHT_NUMBER_OF_VERTECES);
	vertexArr[0] = sf::Vertex(sf::Vector2f(250,250), sf::Color::Red);

	double deltaAng = 6.283 / ((double)LIGHT_NUMBER_OF_VERTECES);
	double ang = 0;

	for (int nr = 0; nr < LIGHT_NUMBER_OF_VERTECES; nr++)
	{
	sf::Vector2f pos(250 + cos(ang) * 300, 250 + sin(ang) * 300);
	vertexArr.append(sf::Vertex(pos, sf::Color::Transparent));
	ang += deltaAng;
	}


	while (window.isOpen())
	{

		while (window.pollEvent(event))
		{
			if (window.hasFocus())
			{
				if (event.type == sf::Event::Closed || sf::Keyboard::isKeyPressed(sf::Keyboard::Escape)) window.close();
			}
			else if (event.type == sf::Event::Closed) window.close();
		}

		window.clear();
		window.draw(vertexArr);
		window.display();
	}





}