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/*
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* This file is a part of the C port of the Poly2Tri library
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* Porting to C done by (c) Barak Itkin <lightningismyname@gmail.com>
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* http://code.google.com/p/poly2tri-c/
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*
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* Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
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* http://code.google.com/p/poly2tri/
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Poly2Tri nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __P2TC_P2T_UTILS_H__
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#define __P2TC_P2T_UTILS_H__
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#include <glib.h>
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#include "poly2tri-private.h"
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#include "cutils.h"
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#include "shapes.h"
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#define PI_3div4 (3 * G_PI / 4)
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#define EPSILON (1e-6)
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typedef enum
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{
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CW, CCW, COLLINEAR
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} P2tOrientation;
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/**
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* Forumla to calculate signed area<br>
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* Positive if CCW<br>
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* Negative if CW<br>
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* 0 if collinear<br>
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* <pre>
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* A[P1,P2,P3] = (x1*y2 - y1*x2) + (x2*y3 - y2*x3) + (x3*y1 - y3*x1)
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* = (x1-x3)*(y2-y3) - (y1-y3)*(x2-x3)
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* </pre>
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*/
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P2tOrientation p2t_orient2d (P2tPoint* pa, P2tPoint* pb, P2tPoint* pc);
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gboolean p2t_utils_in_scan_area (P2tPoint* pa, P2tPoint* pb, P2tPoint* pc, P2tPoint* pd);
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#endif
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