在我的程序中,我希望能够知道鼠标滚轮是否已滚动,如果是,那么在多大方向上滚动了多少。这可能与C ++和SFML一起使用吗?
到目前为止,我有这个:
if (sf::Event::MouseWheelEvent().delta != 0)
{
SimulationView.zoom(1 + (10 / sf::Event::MouseWheelEvent().delta));
}
但即使滚动鼠标滚轮,第二行也不会显示
答案 0 :(得分:5)
您可以将鼠标滚轮作为每帧轮询一次的事件循环的一部分来阅读:
int main()
{
sf::RenderWindow window(sf::VideoMode(320, 256), "Title");
sf::Event event;
while(window.isOpen())
{
while(window.pollEvent(event))
{
if(event.type == sf::Event::Closed)
window.close();
else if(event.type == sf::Event::MouseWheelMoved)
{
// display number of ticks mouse wheel has moved
std::cout << event.mouseWheel.delta << '\n';
}
}
window.clear();
// draw window here
window.display();
}
}
注意:适用于SFML 2.3
感谢@Hiura在sf::Event::MouseWheelMoved
中指出SFML 2.3
已弃用。
if(event.type == sf::Event::MouseWheelScrolled)
{
if(event.mouseWheelScroll.wheel == sf::Mouse::VerticalWheel)
std::cout << "wheel type: vertical" << std::endl;
else if(event.mouseWheelScroll.wheel == sf::Mouse::HorizontalWheel)
std::cout << "wheel type: horizontal" << std::endl;
else
std::cout << "wheel type: unknown" << std::endl;
std::cout << "wheel movement: " << event.mouseWheelScroll.delta << std::endl;
std::cout << "mouse x: " << event.mouseWheelScroll.x << std::endl;
std::cout << "mouse y: " << event.mouseWheelScroll.y << std::endl;
}