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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
*/
/**
* \file SDL_ellipse.h
*
* Header file for SDL_ellipse definition and management functions.
*/
#ifndef _SDL_ellipse_h
#define _SDL_ellipse_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 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;
/**
* \brief Returns true if the ellipse has no area.
*/
#define SDL_EllipseEmpty(X) ((X)->r <= 0)
/**
* \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))
/**
* \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);
/**
* \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);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_ellipse_h */