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Added management and drawing functions for ellipses and polygons.
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Eli Gottlieb
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Jun 3, 2010
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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 | ||
*/ | ||
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/** | ||
* \file SDL_ellipse.h | ||
* | ||
* Header file for SDL_ellipse definition and management functions. | ||
*/ | ||
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#ifndef _SDL_ellipse_h | ||
#define _SDL_ellipse_h | ||
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#include "SDL_stdinc.h" | ||
#include "SDL_error.h" | ||
#include "SDL_pixels.h" | ||
#include "SDL_rwops.h" | ||
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#include "begin_code.h" | ||
/* Set up for C function definitions, even when using C++ */ | ||
#ifdef __cplusplus | ||
/* *INDENT-OFF* */ | ||
extern "C" { | ||
/* *INDENT-ON* */ | ||
#endif | ||
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/** | ||
* \brief The structure that defines an ellipse. | ||
* | ||
* \sa SDL_EllipseEmpty | ||
* \sa SDL_EllipseEquals | ||
* \sa SDL_EllipsesIntersect | ||
* \sa SDL_IntersectEllipseAndLine | ||
*/ | ||
typedef struct SDL_Ellipse { | ||
int x,y; | ||
int a,b; | ||
int r; | ||
} SDL_Ellipse; | ||
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/** | ||
* \brief Returns true if the ellipse has no area. | ||
*/ | ||
#define SDL_EllipseEmpty(X) ((X)->r <= 0) | ||
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/** | ||
* \brief Returns true if the two ellipses are equal. | ||
*/ | ||
#define SDL_EllipseEquals(A, B) (((A)->x == (B)->x) && ((A)->y == (B)->y) && \ | ||
((A)->a == (B)->a) && ((A)->b == (B)->b) && ((A)->r == (B)->r)) | ||
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/** | ||
* \brief Determine whether two ellipses intersect. | ||
* | ||
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise. | ||
*/ | ||
extern DECLSPEC SDL_bool SDLCALL SDL_EllipsesIntersect(const SDL_Ellipse * A,const SDL_Ellipse * B); | ||
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/** | ||
* \brief Calculate the intersection of an ellipse and line segment. | ||
* | ||
* \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise. | ||
*/ | ||
extern DECLSPEC SDL_bool SDLCALL SDL_IntersectEllipseAndLine(const SDL_Ellipse *ellipse,int *X1,int *Y1,int *X2,int *Y2); | ||
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/* Ends C function definitions when using C++ */ | ||
#ifdef __cplusplus | ||
/* *INDENT-OFF* */ | ||
} | ||
/* *INDENT-ON* */ | ||
#endif | ||
#include "close_code.h" | ||
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#endif /* _SDL_ellipse_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 | ||
*/ | ||
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/** | ||
* \file SDL_poly.h | ||
* | ||
* Header file for SDL_poly definition and management functions. | ||
*/ | ||
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#ifndef _SDL_poly_h | ||
#define _SDL_poly_h | ||
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#include "SDL_stdinc.h" | ||
#include "SDL_error.h" | ||
#include "SDL_pixels.h" | ||
#include "SDL_rwops.h" | ||
#include "SDL_rect.h" | ||
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#include "begin_code.h" | ||
/* Set up for C function definitions, even when using C++ */ | ||
#ifdef __cplusplus | ||
/* *INDENT-OFF* */ | ||
extern "C" { | ||
/* *INDENT-ON* */ | ||
#endif | ||
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/** | ||
* \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; | ||
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/** | ||
* \brief Returns true if the polygon has no area. | ||
*/ | ||
#define SDL_PolyEmpty(X) (((X)->vertices == NULL) || ((X)->count <= 2)) | ||
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/** | ||
* \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); | ||
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/** | ||
* \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); | ||
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/** | ||
* \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); | ||
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/** | ||
* \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); | ||
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/** | ||
* \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); | ||
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/* Ends C function definitions when using C++ */ | ||
#ifdef __cplusplus | ||
/* *INDENT-OFF* */ | ||
} | ||
/* *INDENT-ON* */ | ||
#endif | ||
#include "close_code.h" | ||
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#endif /* _SDL_poly_h */ |
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