SDL_RenderSetViewport

Use this function to set the drawing area for rendering on the current target.使用该函数可以为当前渲染目标上的渲染操作设置绘制区域。

Syntax 语法

int SDL_RenderSetViewport(SDL_Renderer*   renderer,
                          const SDL_Rect* rect)

renderer	the rendering context	渲染器
rect	the SDL_Rect structure representing the drawing area, or NULL to set the viewport to the entire target	表示绘制区域的SDL_Rect结构，或者为NULL以表示绘制区域为整个渲染目标

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.执行成功返回0,执行失败则返回一个负的错误码，调用SDL_GetError()以获得更多的错误信息。

暂无

When the window is resized, the current viewport is automatically centered within the new window size.当窗口重新调整大小后，当前的绘制区域也会自动调整至新的窗口尺寸的中央。