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


Calculate the intersection of a rectangle and line segment with float precision.


SDL_bool SDL_IntersectFRectAndLine(const SDL_FRect *
                                   rect, float *X1,
                                   float *Y1, float *X2,
                                   float *Y2);

Function Parameters

rect an SDL_FRect structure representing the rectangle to intersect
X1 a pointer to the starting X-coordinate of the line
Y1 a pointer to the starting Y-coordinate of the line
X2 a pointer to the ending X-coordinate of the line
Y2 a pointer to the ending Y-coordinate of the line

Return Value

Returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise.


This function is used to clip a line segment to a rectangle. A line segment contained entirely within the rectangle or that does not intersect will remain unchanged. A line segment that crosses the rectangle at either or both ends will be clipped to the boundary of the rectangle and the new coordinates saved in X1, Y1, X2, and/or Y2 as necessary.


This function is available since SDL 2.0.22.


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