93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 2010 Eli Gottlieb
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Eli Gottlieb
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eligottlieb@gmail.com
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*/
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/**
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* \file SDL_ellipse.h
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*
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* Header file for SDL_ellipse definition and management functions.
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*/
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#ifndef _SDL_ellipse_h
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#define _SDL_ellipse_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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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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* \brief The structure that defines an ellipse.
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*
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* \sa SDL_EllipseEmpty
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* \sa SDL_EllipseEquals
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* \sa SDL_EllipsesIntersect
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* \sa SDL_IntersectEllipseAndLine
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*/
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typedef struct SDL_Ellipse {
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int x,y;
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int a,b;
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int r;
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} SDL_Ellipse;
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/**
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* \brief Returns true if the ellipse has no area.
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*/
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#define SDL_EllipseEmpty(X) ((X)->r <= 0)
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/**
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* \brief Returns true if the two ellipses are equal.
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*/
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#define SDL_EllipseEquals(A, B) (((A)->x == (B)->x) && ((A)->y == (B)->y) && \
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((A)->a == (B)->a) && ((A)->b == (B)->b) && ((A)->r == (B)->r))
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/**
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* \brief Determine whether two ellipses 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_EllipsesIntersect(const SDL_Ellipse * A,const SDL_Ellipse * B);
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/**
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* \brief Calculate the intersection of an ellipse 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_IntersectEllipseAndLine(const SDL_Ellipse *ellipse,int *X1,int *Y1,int *X2,int *Y2);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* _SDL_ellipse_h */
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