(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_GetRectAndLineIntersection

Calculate the intersection of a rectangle and line segment.

Header File

Defined in <SDL3/SDL_rect.h>

Syntax

bool SDL_GetRectAndLineIntersection(const SDL_Rect *rect, int *X1, int *Y1, int *X2, int *Y2);

Function Parameters

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

Return Value

(bool) Returns true if there is an intersection, 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 3.1.3.

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CategoryAPI, CategoryAPIFunction, CategoryRect

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