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SDL_rect.h
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SDL_rect.h
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/**
* \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
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif
/**
* \brief The structure that defines a point
*
* \sa SDL_EnclosePoints
*/
typedef struct
{
int x;
int y;
} SDL_Point;
/**
* \brief A rectangle, with the origin at the upper left.
*
* \sa SDL_RectEmpty
* \sa SDL_RectEquals
* \sa SDL_HasIntersection
* \sa SDL_IntersectRect
* \sa SDL_UnionRect
* \sa SDL_EnclosePoints
*/
typedef struct SDL_Rect
{
int x, y;
int w, h;
} SDL_Rect;
/**
* \brief Returns true if the rectangle has no area.
*/
#define SDL_RectEmpty(X) (((X)->w <= 0) || ((X)->h <= 0))
/**
* \brief Returns true if the two rectangles are equal.
*/
#define SDL_RectEquals(A, B) (((A)->x == (B)->x) && ((A)->y == (B)->y) && \
((A)->w == (B)->w) && ((A)->h == (B)->h))
/**
* \brief Determine whether two rectangles intersect.
*
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersection(const SDL_Rect * A,
const SDL_Rect * B);
/**
* \brief Calculate the intersection of two rectangles.
*
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRect(const SDL_Rect * A,
const SDL_Rect * B,
SDL_Rect * result);
/**
* \brief Calculate the union of two rectangles.
*/
extern DECLSPEC void SDLCALL SDL_UnionRect(const SDL_Rect * A,
const SDL_Rect * B,
SDL_Rect * result);
/**
* \brief Calculate a minimal rectangle enclosing a set of points
*
* \return SDL_TRUE if any points were within the clipping rect
*/
extern DECLSPEC SDL_bool SDLCALL SDL_EnclosePoints(const SDL_Point * points,
int count,
const SDL_Rect * clip,
SDL_Rect * result);
/**
* \brief Calculate the intersection of a rectangle and line segment.
*
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRectAndLine(const SDL_Rect *
rect, int *X1,
int *Y1, int *X2,
int *Y2);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_rect_h */
/* vi: set ts=4 sw=4 expandtab: */