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C-/C++-Quelltext

vWinkel = vBahn/(radius*2*PI)*360

C-/C++-Quelltext

#include <SFML/Graphics.hpp>
#include <iostream>
#include <cmath>


int main()
{
    sf::RenderWindow window(sf::VideoMode(1024, 768), "Circle");

    window.setFramerateLimit(60);

    sf::RenderTexture m_RenderTexture;
    m_RenderTexture.create(window.getSize().x, window.getSize().y);
    sf::Sprite m_RenderSprite;
    sf::Vector2f HalfWindowSize(window.getSize() / 2u);


    float theta = 0.0;
    float radius = 1.0;
    sf::CircleShape circle;
    circle.setOutlineThickness(1);
    circle.setOutlineColor(sf::Color::Black);
    circle.setRadius(50);
    circle.setPosition(HalfWindowSize.x - circle.getRadius() / 2, HalfWindowSize.y - circle.getRadius() / 2);


    sf::Clock FrameClock;
    float fTime;
    sf::Vector2f point1(100, 100);

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            // Close Event
            if (event.type == sf::Event::Closed)
                window.close();

            // Escape key pressed
            if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Escape))
                window.close();

        }

        fTime = FrameClock.restart().asSeconds();
//        std::cout << "Framerate: " << 1 / fTime << std::endl;

        theta += 5 / (radius * 2 * M_PI) * 2 * M_PI;//+= 5 * fTime;
        std::cout << "Theta: " << theta << std::endl;

        radius += 10 * fTime;

        sf::Vector2f PointToRotate(HalfWindowSize.x - radius, HalfWindowSize.y - radius);

        circle.setPosition(cos(theta) * (PointToRotate.x - HalfWindowSize.x) - sin(theta) * (PointToRotate.y - HalfWindowSize.y) + HalfWindowSize.x, sin(theta) * (PointToRotate.x - HalfWindowSize.x) + cos(theta) * (PointToRotate.y - HalfWindowSize.y) + HalfWindowSize.y);

        m_RenderTexture.draw(circle);
        m_RenderTexture.display();

        window.clear();
        m_RenderSprite.setTexture(m_RenderTexture.getTexture());
        window.draw(m_RenderSprite);
        window.display();
    }

    return 0;
}