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SDL_poly.h
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 2010 Eli Gottlieb
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
Eli Gottlieb
eligottlieb@gmail.com
*/
/**
* \file SDL_poly.h
*
* Header file for SDL_poly definition and management functions.
*/
#ifndef _SDL_poly_h
#define _SDL_poly_h
#include "SDL_stdinc.h"
#include "SDL_error.h"
#include "SDL_pixels.h"
#include "SDL_rwops.h"
#include "SDL_rect.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 an polygon.
*
* \sa SDL_PolyEmpty
* \sa SDL_PolyEquals
* \sa SDL_PolysIntersect
* \sa SDL_IntersectPoly
* \sa SDL_WrapPoints
* \sa SDL_IntersectPolyAndLine
*/
typedef struct SDL_Poly {
SDL_Point *vertices;
int count;
} SDL_Poly;
/**
* \brief Returns true if the polygon has no area.
*/
#define SDL_PolyEmpty(X) (((X)->vertices == NULL) || ((X)->count <= 2))
/**
* \brief Determine whether two polygons are equal.
*
* \return SDL_TRUE if the polygons are equal, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_PolyEquals(const SDL_Poly *A,const SDL_Poly *A);
/**
* \brief Determine whether two rectangles intersect.
*
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_PolysIntersect(const SDL_Poly * A,const SDL_Poly * 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_IntersectPoly(const SDL_Poly * A,const SDL_Poly * B,SDL_Poly * result);
/**
* \brief Calculate a minimal polygon wrapping a set of points
*
* \return 0 on success, -1 if the parameters were invalid, and -2 if an insufficient number of points were supplied
* in the output polygon.
*/
extern DECLSPEC int SDLCALL SDL_WrapPoints(const SDL_Point * points,int count,SDL_Poly *result);
/**
* \brief Calculate the intersection of a polygon and line segment.
*
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_IntersectPolyAndLine(const SDL_Poly *poly,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_poly_h */