SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Get logical coordinates of point in renderer when given real coordinates of point in window.


void SDL_RenderWindowToLogical(SDL_Renderer * renderer, 
                                    int windowX, int windowY, 
                                    float *logicalX, float *logicalY);

Function Parameters

renderer the renderer from which the logical coordinates should be calculated
windowX the real X coordinate in the window
windowY the real Y coordinate in the window
logicalX the pointer filled with the logical x coordinate
logicalY the pointer filled with the logical y coordinate


Logical coordinates will differ from real coordinates when render is scaled and logical renderer size set


This function is available since SDL 2.0.18.


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