analitzaplot/private/abstractplanecurve.cpp

0001 /*************************************************************************************
0002  *  Copyright (C) 2007-2009 by Aleix Pol <aleixpol@kde.org>                          *
0003  *  Copyright (C) 2010 by Percy Camilo T. Aucahuasi <percy.camilo.ta@gmail.com>      *
0004  *                                                                                   *
0005  *  This program is free software; you can redistribute it and/or                    *
0006  *  modify it under the terms of the GNU General Public License                      *
0007  *  as published by the Free Software Foundation; either version 2                   *
0008  *  of the License, or (at your option) any later version.                           *
0009  *                                                                                   *
0010  *  This program is distributed in the hope that it will be useful,                  *
0011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of                   *
0012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                    *
0013  *  GNU General Public License for more details.                                     *
0014  *                                                                                   *
0015  *  You should have received a copy of the GNU General Public License                *
0016  *  along with this program; if not, write to the Free Software                      *
0017  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
0018  *************************************************************************************/
0019
0020 #include "abstractplanecurve.h"
0021 #include "functiongraph.h"
0022
0023 #include <cmath>
0024
0025 #include "analitza/analyzer.h"
0026 #include "analitza/value.h"
0027 #include "analitza/variable.h"
0028 #include "utils/mathutils.h"
0029
0030 using namespace Analitza;
0031
0032 AbstractPlaneCurve::AbstractPlaneCurve(const Analitza::Expression& e, const QSharedPointer<Analitza::Variables>& v)
0033     : AbstractFunctionGraph(e, v)
0034 {}
0035
0036 AbstractPlaneCurve::~AbstractPlaneCurve()
0037 {}
0038
0039 bool AbstractPlaneCurve::addPoint(const QPointF& p)
0040 {
0041     int count=points.count();
0042     if(count<2) {
0043         points.append(p);
0044         return false;
0045     }
0046
0047     double angle1=std::atan2(points[count-1].y()-points[count-2].y(), points[count-1].x()-points[count-2].x());
0048     double angle2=std::atan2(p.y()-points[count-1].y(), p.x()-points[count-1].x());
0049
0050     bool append=!isSimilar(angle1, angle2);
0051     if(append)
0052         points.append(p);
0053     else
0054         points.last()=p;
0055
0056     return append;
0057 }