I'm drawing a convex shape figure using SFML library:
#include <SFML/Graphics.hpp>
using namespace sf;
int main()
{
RenderWindow window(VideoMode(400, 400), "SFML window");
ConvexShape convex;
convex.setPointCount(8);
convex.setPoint(0, sf::Vector2f(0, 0));
convex.setPoint(1, sf::Vector2f(180, 0));
convex.setPoint(2, sf::Vector2f(180, 90));
convex.setPoint(3, sf::Vector2f(100, 90));
convex.setPoint(4, sf::Vector2f(100, 180));
convex.setPoint(5, sf::Vector2f(30, 180));
convex.setPoint(6, sf::Vector2f(30, 90));
convex.setPoint(7, sf::Vector2f(0, 90));
convex.setPosition(100, 100);
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
if (event.type == sf::Event::Closed)
window.close();
}
window.clear();
window.draw(convex);
window.display();
}
return EXIT_SUCCESS;
}
The points defined in clockwise order and everything is ok!
But when I change two coordinates a little bit I'm getting something that I really don't expect:
#include <SFML/Graphics.hpp>
using namespace sf;
int main()
{
RenderWindow window(VideoMode(400, 400), "SFML window");
ConvexShape convex;
convex.setPointCount(8);
convex.setPoint(0, sf::Vector2f(0, 0));
convex.setPoint(1, sf::Vector2f(180, 0));
convex.setPoint(2, sf::Vector2f(180, 90));
convex.setPoint(3, sf::Vector2f(100, 90));
convex.setPoint(4, sf::Vector2f(100, 200)); // CHANGED 180 to 200
convex.setPoint(5, sf::Vector2f(30, 200)); // CHANGED 180 to 200
convex.setPoint(6, sf::Vector2f(30, 90));
convex.setPoint(7, sf::Vector2f(0, 90));
convex.setPosition(50, 50);
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
if (event.type == sf::Event::Closed)
window.close();
}
window.clear();
window.draw(convex);
window.display();
}
return EXIT_SUCCESS;
}
I'm getting the following window:
Why this situation take place?
