rotational movement in SFML

gistfile1.txt

#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>

int main()
{
	sf::RenderWindow window(sf::VideoMode(800, 600), "SFML works!");
	sf::RectangleShape shape(sf::Vector2f(70.f, 10.f));
	shape.setFillColor(sf::Color::Green);
	shape.setOrigin(35.f, 5.f);
	shape.setPosition(400.f, 300.f);

	sf::Clock clock;
	

	while (window.isOpen())
	{
		sf::Event event;
		while (window.pollEvent(event))
		{
			if (event.type == sf::Event::Closed)
				window.close();
		}
		//------------------------------------------
		const float dt = clock.restart().asSeconds();
		const float rotation = 200.f;

		if (sf::Keyboard::isKeyPressed(sf::Keyboard::A))
		{
			shape.rotate(-rotation * dt);
		}
		else if (sf::Keyboard::isKeyPressed(sf::Keyboard::D))
		{
			shape.rotate(rotation * dt);
		}


		sf::Vector2f unitVec(-1.f, 0.f);
		sf::Transform t;
		t.rotate(shape.getRotation());
		sf::Vector2f movement = t.transformPoint(unitVec);

		const float velocity = 300.f;
		if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))
		{
			shape.move(movement * velocity * dt);
		}
		else if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
		{
			shape.move(-movement * velocity * dt);
		}
		//-------------------------------------------
		window.clear();
		window.draw(shape);
		window.display();
	}

	return 0;
}