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

SDL_IntersectFRectAndLine

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

Header File

Defined in SDL_rect.h

Syntax

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

Function Parameters

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

Return Value

(SDL_bool) Returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise.

Remarks

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.

Version

This function is available since SDL 2.0.22.

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CategoryAPI, CategoryAPIFunction, CategoryRect

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