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SDL Wiki

SDL_IntersectRectAndLine

Calculate the intersection of a rectangle and line segment.

Syntax

SDL_bool SDL_IntersectRectAndLine(const SDL_Rect *
                                  rect, int *X1,
                                  int *Y1, int *X2,
                                  int *Y2);

Function Parameters

rect

an SDL_Rect 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.

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.


CategoryAPI, CategoryRect


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