#include <SFML/Graphics.hpp>
using namespace sf;

int width = 1024;
int height = 768;

// draw a quadrilateral in w with color c, parameterized by two center points of opposing sides
// (x1, y1), (x2, y2) and 2 radiuses w1, w2.
// You may wonder why we parameterize with w1 and w2 instead of 2 more points...this paramterization
// makes the math for perspectives easier
void drawQuad(RenderWindow &w, Color c, int x1, int y1, int w1, int x2, int y2, int w2)
{
  ConvexShape shape(4);
  shape.setFillColor(c);
  shape.setPoint(0, Vector2f(x1-w1, y1));
  shape.setPoint(1, Vector2f(x2-w2, y2));
  shape.setPoint(2, Vector2f(x2+w2, y2));
  shape.setPoint(3, Vector2f(x1+w1, y1));
  w.draw(shape);
}

int main()
{
  RenderWindow app(VideoMode(width, height), "Outrun Racing!");
  app.setFramerateLimit(60);

  while (app.isOpen())
  {
    Event e;
    while (app.pollEvent(e))
    {
      if (e.type == Event::Closed)
        app.close();
    }

    app.clear();
    drawQuad(app, Color::Green, 500, 500, 200, 500, 300, 100);
    app.display();
  }

  return 0;
}