104 lines
2.4 KiB
C++
104 lines
2.4 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2008, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//paragraph [1] Title: [{\Large \bf \begin {center}] [\end {center}}]
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//[TOC] [\tableofcontents]
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//[ue] [\"u]
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//[ae] [\"a]
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//[oe] [\"o]
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//[x] [$\times $]
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//[->] [$\rightarrow $]
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[1] Implementation
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April - November 2008, M. H[oe]ger for bachelor thesis.
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[2] Implementation with exakt dataype,
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Oktober 2014 - Maerz 2015, S. Schroeer for master thesis.
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[TOC]
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1 Introduction
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2 Defines and Includes
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*/
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#include "Point2D.h"
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#include "Point3D.h"
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namespace temporalalgebra {
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namespace mregionops2 {
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/*
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3 Class Point2D
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*/
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Point2D::Point2D(const Point3D& p) :
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x(p.GetX()), y(p.GetY()) {
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}
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bool Point2D::LiesBetween(Point2D p1, Point2D p2)
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{
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// *this = referenziertes object to compare
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if ((*this == p1) || (*this == p2)) return true;
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// not beetween
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if (p1 == p2) return false;
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if (p1.x != p2.x)
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{
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// x-Koordinate from object
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// what's happend if p2 < p1
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mpq_class ratio = (x - p1.x) / (p2.x - p1.x);
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// shortens common divisor, canonische Form: ratio.canonicalize();
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// < 0 if the point is to the left of p1
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// > 0 if the point is to the right of p1
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// when x is between p1 and p2 should be
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// ratio of the y - values correspond to the x- values
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if ((ratio >= 0) && (ratio <= 1) &&
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((y - p1.y) == (ratio * (p2.y - p1.y)))) return true;
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}
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// p1, p2 lie on a line parallel to the x- axis
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// we know, y1 <> y2 and examine the relationship new
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else
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{
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mpq_class ratio = (y - p1.y) / (p2.y - p1.y);
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if ((ratio >= 0) && (ratio <= 1) &&
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((x - p1.x) == (ratio * (p2.x - p1.x)))) return true;
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}
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return false;
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}
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} // end of namespace mregionops2
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} // end of namespace temporalalgebra
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