| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| /** |
| * \file SDL_rect.h |
| * |
| * Header file for SDL_rect definition and management functions. |
| */ |
| |
| #ifndef SDL_rect_h_ |
| #define SDL_rect_h_ |
| |
| #include "SDL_stdinc.h" |
| #include "SDL_error.h" |
| #include "SDL_pixels.h" |
| #include "SDL_rwops.h" |
| |
| #include "begin_code.h" |
| /* Set up for C function definitions, even when using C++ */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * The structure that defines a point (integer) |
| * |
| * \sa SDL_EnclosePoints |
| * \sa SDL_PointInRect |
| */ |
| typedef struct SDL_Point |
| { |
| int x; |
| int y; |
| } SDL_Point; |
| |
| /** |
| * The structure that defines a point (floating point) |
| * |
| * \sa SDL_EncloseFPoints |
| * \sa SDL_PointInFRect |
| */ |
| typedef struct SDL_FPoint |
| { |
| float x; |
| float y; |
| } SDL_FPoint; |
| |
| |
| /** |
| * A rectangle, with the origin at the upper left (integer). |
| * |
| * \sa SDL_RectEmpty |
| * \sa SDL_RectEquals |
| * \sa SDL_HasIntersection |
| * \sa SDL_IntersectRect |
| * \sa SDL_IntersectRectAndLine |
| * \sa SDL_UnionRect |
| * \sa SDL_EnclosePoints |
| */ |
| typedef struct SDL_Rect |
| { |
| int x, y; |
| int w, h; |
| } SDL_Rect; |
| |
| |
| /** |
| * A rectangle, with the origin at the upper left (floating point). |
| * |
| * \sa SDL_FRectEmpty |
| * \sa SDL_FRectEquals |
| * \sa SDL_FRectEqualsEpsilon |
| * \sa SDL_HasIntersectionF |
| * \sa SDL_IntersectFRect |
| * \sa SDL_IntersectFRectAndLine |
| * \sa SDL_UnionFRect |
| * \sa SDL_EncloseFPoints |
| * \sa SDL_PointInFRect |
| */ |
| typedef struct SDL_FRect |
| { |
| float x; |
| float y; |
| float w; |
| float h; |
| } SDL_FRect; |
| |
| |
| /** |
| * Returns true if point resides inside a rectangle. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_PointInRect(const SDL_Point *p, const SDL_Rect *r) |
| { |
| return ( (p->x >= r->x) && (p->x < (r->x + r->w)) && |
| (p->y >= r->y) && (p->y < (r->y + r->h)) ) ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Returns true if the rectangle has no area. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_RectEmpty(const SDL_Rect *r) |
| { |
| return ((!r) || (r->w <= 0) || (r->h <= 0)) ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Returns true if the two rectangles are equal. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_RectEquals(const SDL_Rect *a, const SDL_Rect *b) |
| { |
| return (a && b && (a->x == b->x) && (a->y == b->y) && |
| (a->w == b->w) && (a->h == b->h)) ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Determine whether two rectangles intersect. |
| * |
| * If either pointer is NULL the function will return SDL_FALSE. |
| * |
| * \param A an SDL_Rect structure representing the first rectangle |
| * \param B an SDL_Rect structure representing the second rectangle |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.0. |
| * |
| * \sa SDL_IntersectRect |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersection(const SDL_Rect * A, |
| const SDL_Rect * B); |
| |
| /** |
| * Calculate the intersection of two rectangles. |
| * |
| * If `result` is NULL then this function will return SDL_FALSE. |
| * |
| * \param A an SDL_Rect structure representing the first rectangle |
| * \param B an SDL_Rect structure representing the second rectangle |
| * \param result an SDL_Rect structure filled in with the intersection of |
| * rectangles `A` and `B` |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.0. |
| * |
| * \sa SDL_HasIntersection |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRect(const SDL_Rect * A, |
| const SDL_Rect * B, |
| SDL_Rect * result); |
| |
| /** |
| * Calculate the union of two rectangles. |
| * |
| * \param A an SDL_Rect structure representing the first rectangle |
| * \param B an SDL_Rect structure representing the second rectangle |
| * \param result an SDL_Rect structure filled in with the union of rectangles |
| * `A` and `B` |
| * |
| * \since This function is available since SDL 2.0.0. |
| */ |
| extern DECLSPEC void SDLCALL SDL_UnionRect(const SDL_Rect * A, |
| const SDL_Rect * B, |
| SDL_Rect * result); |
| |
| /** |
| * Calculate a minimal rectangle enclosing a set of points. |
| * |
| * If `clip` is not NULL then only points inside of the clipping rectangle are |
| * considered. |
| * |
| * \param points an array of SDL_Point structures representing points to be |
| * enclosed |
| * \param count the number of structures in the `points` array |
| * \param clip an SDL_Rect used for clipping or NULL to enclose all points |
| * \param result an SDL_Rect structure filled in with the minimal enclosing |
| * rectangle |
| * \returns SDL_TRUE if any points were enclosed or SDL_FALSE if all the |
| * points were outside of the clipping rectangle. |
| * |
| * \since This function is available since SDL 2.0.0. |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_EnclosePoints(const SDL_Point * points, |
| int count, |
| const SDL_Rect * clip, |
| SDL_Rect * result); |
| |
| /** |
| * Calculate the intersection of a rectangle and line segment. |
| * |
| * 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. |
| * |
| * \param rect an SDL_Rect structure representing the rectangle to intersect |
| * \param X1 a pointer to the starting X-coordinate of the line |
| * \param Y1 a pointer to the starting Y-coordinate of the line |
| * \param X2 a pointer to the ending X-coordinate of the line |
| * \param Y2 a pointer to the ending Y-coordinate of the line |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.0. |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRectAndLine(const SDL_Rect * |
| rect, int *X1, |
| int *Y1, int *X2, |
| int *Y2); |
| |
| |
| /* SDL_FRect versions... */ |
| |
| /** |
| * Returns true if point resides inside a rectangle. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_PointInFRect(const SDL_FPoint *p, const SDL_FRect *r) |
| { |
| return ( (p->x >= r->x) && (p->x < (r->x + r->w)) && |
| (p->y >= r->y) && (p->y < (r->y + r->h)) ) ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Returns true if the rectangle has no area. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_FRectEmpty(const SDL_FRect *r) |
| { |
| return ((!r) || (r->w <= 0.0f) || (r->h <= 0.0f)) ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Returns true if the two rectangles are equal, within some given epsilon. |
| * |
| * \since This function is available since SDL 2.0.22. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_FRectEqualsEpsilon(const SDL_FRect *a, const SDL_FRect *b, const float epsilon) |
| { |
| return (a && b && ((a == b) || |
| ((SDL_fabs(a->x - b->x) <= epsilon) && |
| (SDL_fabs(a->y - b->y) <= epsilon) && |
| (SDL_fabs(a->w - b->w) <= epsilon) && |
| (SDL_fabs(a->h - b->h) <= epsilon)))) |
| ? SDL_TRUE : SDL_FALSE; |
| } |
| |
| /** |
| * Returns true if the two rectangles are equal, using a default epsilon. |
| * |
| * \since This function is available since SDL 2.0.22. |
| */ |
| SDL_FORCE_INLINE SDL_bool SDL_FRectEquals(const SDL_FRect *a, const SDL_FRect *b) |
| { |
| return SDL_FRectEqualsEpsilon(a, b, SDL_FLT_EPSILON); |
| } |
| |
| /** |
| * Determine whether two rectangles intersect with float precision. |
| * |
| * If either pointer is NULL the function will return SDL_FALSE. |
| * |
| * \param A an SDL_FRect structure representing the first rectangle |
| * \param B an SDL_FRect structure representing the second rectangle |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.22. |
| * |
| * \sa SDL_IntersectRect |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersectionF(const SDL_FRect * A, |
| const SDL_FRect * B); |
| |
| /** |
| * Calculate the intersection of two rectangles with float precision. |
| * |
| * If `result` is NULL then this function will return SDL_FALSE. |
| * |
| * \param A an SDL_FRect structure representing the first rectangle |
| * \param B an SDL_FRect structure representing the second rectangle |
| * \param result an SDL_FRect structure filled in with the intersection of |
| * rectangles `A` and `B` |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.22. |
| * |
| * \sa SDL_HasIntersectionF |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_IntersectFRect(const SDL_FRect * A, |
| const SDL_FRect * B, |
| SDL_FRect * result); |
| |
| /** |
| * Calculate the union of two rectangles with float precision. |
| * |
| * \param A an SDL_FRect structure representing the first rectangle |
| * \param B an SDL_FRect structure representing the second rectangle |
| * \param result an SDL_FRect structure filled in with the union of rectangles |
| * `A` and `B` |
| * |
| * \since This function is available since SDL 2.0.22. |
| */ |
| extern DECLSPEC void SDLCALL SDL_UnionFRect(const SDL_FRect * A, |
| const SDL_FRect * B, |
| SDL_FRect * result); |
| |
| /** |
| * Calculate a minimal rectangle enclosing a set of points with float |
| * precision. |
| * |
| * If `clip` is not NULL then only points inside of the clipping rectangle are |
| * considered. |
| * |
| * \param points an array of SDL_FPoint structures representing points to be |
| * enclosed |
| * \param count the number of structures in the `points` array |
| * \param clip an SDL_FRect used for clipping or NULL to enclose all points |
| * \param result an SDL_FRect structure filled in with the minimal enclosing |
| * rectangle |
| * \returns SDL_TRUE if any points were enclosed or SDL_FALSE if all the |
| * points were outside of the clipping rectangle. |
| * |
| * \since This function is available since SDL 2.0.22. |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_EncloseFPoints(const SDL_FPoint * points, |
| int count, |
| const SDL_FRect * clip, |
| SDL_FRect * result); |
| |
| /** |
| * Calculate the intersection of a rectangle and line segment with float |
| * precision. |
| * |
| * 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. |
| * |
| * \param rect an SDL_FRect structure representing the rectangle to intersect |
| * \param X1 a pointer to the starting X-coordinate of the line |
| * \param Y1 a pointer to the starting Y-coordinate of the line |
| * \param X2 a pointer to the ending X-coordinate of the line |
| * \param Y2 a pointer to the ending Y-coordinate of the line |
| * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise. |
| * |
| * \since This function is available since SDL 2.0.22. |
| */ |
| extern DECLSPEC SDL_bool SDLCALL SDL_IntersectFRectAndLine(const SDL_FRect * |
| rect, float *X1, |
| float *Y1, float *X2, |
| float *Y2); |
| |
| /* Ends C function definitions when using C++ */ |
| #ifdef __cplusplus |
| } |
| #endif |
| #include "close_code.h" |
| |
| #endif /* SDL_rect_h_ */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
