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並前往https://stackify.dev/802807-what-exactly-is-a-renderer-in-sdl2

What exactly is a renderer in SDL2? - Stackify

you are correct that you need to use either SDL_RenderDrawRect() , or SDL_RenderFillRect() . SDL_RenderDrawRect will draw an unfilled rectangle.

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查詢 「SDL_RenderDrawRect」的人也找了：

  1. SDL_RenderFillRect
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  5. SDL_RenderCopy
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  6. SDL_CreateTexture
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  7. SDL_RenderCopyEx
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  8. SDL_FillRect
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