c++ - 围绕对象中心的 SFML 旋转

Question

所以我这里有这段代码:

void Star::createStar(){
sf::CircleShape star1(r,50);
star1.setPosition(x,y);
sf::Texture* t = CreateTexture(256,256);
star1.setTexture(t,false);
star=star1;
std::cout << "Done!"<<std::endl;
}
void Star::update(){
star.setOrigin(x-(.5*r),y-(.5*r));

star.rotate(0.01);
}

我希望星星围绕它的中心旋转，但我可能计算错误，但它似乎围绕同一点旋转，即使我没有声明中心也是如此。

编辑:我修复了 star.setOrigin() 应该有参数 r,r!

Answer 1

这是正确的代码

void Star::createStar(){
sf::CircleShape star1(r,50);
star1.setPosition(x,y);
sf::Texture* t = CreateTexture(256,256);
star1.setTexture(t,false);
star=star1;
std::cout << "Done!"<<std::endl;
}
void Star::update(){
//star.setOrigin(x-(.5*r),y-(.5*r));
//no need to set origin
star.rotate(0.01);
}