问题描述
我打算制作一款游戏，我想为该游戏制作一些背景动画.这些动画之一是旋转矩形.我已经翻遍了所有内容，但找不到任何形式的数学或逻辑可以让我旋转矩形(具体来说是 SDL_Rect，但您可能已经知道).
I plan on making a game, and I want to create some background animations for said game. One of these animations is a rotating rectangle. I've looked all over, and I cannot find any form of math or logic that allows me to rotate a rectangle (SDL_Rect to be specific, but you might have already known that).
我无法自己计算数学，我真的没有任何可用于此的代码，所以我无法显示任何内容.
I can't figure out the math for myself, I really don't have any working code for this, so I can't show anything.
本质上，我正在寻找某种类型的逻辑，我可以应用矩形的坐标，以便每当主游戏循环循环时，它都会将矩形旋转一定的度数.
Essentially I'm looking for some type of logic that I can apply the rectangle's coordinates so that whenever the main game loop loops, it will rotate the rectangle some amount of degrees.
推荐答案
你不能旋转 SDL_Rect.如果你看看它的定义，它是由左上角、宽度和高度的坐标组成的.无法表示边不平行于坐标系轴的矩形.
You can't rotate an SDL_Rect. If you look at its definition, it's made of coordinates for the top-left corner, the width and the height. There's no way to represent a rectangle with sides that aren't parallel to the coordinate system's axes.
SDL_RenderCopyEx 支持绘制旋转纹理.
SDL_RenderCopyEx supports drawing rotated textures, though.
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