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149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
1 year ago
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_rect.h
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*
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* Header file for SDL_rect definition and management functions.
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*/
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#ifndef _SDL_rect_h
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#define _SDL_rect_h
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "SDL_pixels.h"
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#include "SDL_rwops.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief The structure that defines a point
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*
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* \sa SDL_EnclosePoints
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* \sa SDL_PointInRect
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*/
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typedef struct SDL_Point
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{
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int x;
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int y;
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} SDL_Point;
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/**
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* \brief A rectangle, with the origin at the upper left.
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*
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* \sa SDL_RectEmpty
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* \sa SDL_RectEquals
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* \sa SDL_HasIntersection
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* \sa SDL_IntersectRect
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* \sa SDL_UnionRect
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* \sa SDL_EnclosePoints
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*/
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typedef struct SDL_Rect
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{
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int x, y;
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int w, h;
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} SDL_Rect;
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/**
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* \brief Returns true if point resides inside a rectangle.
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*/
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SDL_FORCE_INLINE SDL_bool SDL_PointInRect(const SDL_Point *p, const SDL_Rect *r)
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{
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return ( (p->x >= r->x) && (p->x < (r->x + r->w)) &&
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(p->y >= r->y) && (p->y < (r->y + r->h)) ) ? SDL_TRUE : SDL_FALSE;
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}
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/**
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* \brief Returns true if the rectangle has no area.
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*/
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SDL_FORCE_INLINE SDL_bool SDL_RectEmpty(const SDL_Rect *r)
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{
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return ((!r) || (r->w <= 0) || (r->h <= 0)) ? SDL_TRUE : SDL_FALSE;
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}
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/**
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* \brief Returns true if the two rectangles are equal.
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*/
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SDL_FORCE_INLINE SDL_bool SDL_RectEquals(const SDL_Rect *a, const SDL_Rect *b)
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{
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return (a && b && (a->x == b->x) && (a->y == b->y) &&
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(a->w == b->w) && (a->h == b->h)) ? SDL_TRUE : SDL_FALSE;
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}
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/**
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* \brief Determine whether two rectangles intersect.
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*
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* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersection(const SDL_Rect * A,
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const SDL_Rect * B);
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/**
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* \brief Calculate the intersection of two rectangles.
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*
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* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRect(const SDL_Rect * A,
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const SDL_Rect * B,
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SDL_Rect * result);
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/**
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* \brief Calculate the union of two rectangles.
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*/
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extern DECLSPEC void SDLCALL SDL_UnionRect(const SDL_Rect * A,
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const SDL_Rect * B,
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SDL_Rect * result);
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/**
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* \brief Calculate a minimal rectangle enclosing a set of points
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*
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* \return SDL_TRUE if any points were within the clipping rect
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_EnclosePoints(const SDL_Point * points,
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int count,
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const SDL_Rect * clip,
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SDL_Rect * result);
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/**
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* \brief Calculate the intersection of a rectangle and line segment.
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*
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* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRectAndLine(const SDL_Rect *
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rect, int *X1,
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int *Y1, int *X2,
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int *Y2);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* _SDL_rect_h */
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/* vi: set ts=4 sw=4 expandtab: */
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