QtiPlot 0.9.7.3

LogitScaleEngine.h

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00001 /***************************************************************************
00002     File                 : LogitScaleEngine.h
00003     Project              : QtiPlot
00004     --------------------------------------------------------------------
00005     Copyright            : (C) 2009 by Ion Vasilief
00006     Email (use @ for *)  : ion_vasilief*yahoo.fr
00007     Description          : Engine for logit scales
00008 
00009  ***************************************************************************/
00010 
00011 /***************************************************************************
00012  *                                                                         *
00013  *  This program is free software; you can redistribute it and/or modify   *
00014  *  it under the terms of the GNU General Public License as published by   *
00015  *  the Free Software Foundation; either version 2 of the License, or      *
00016  *  (at your option) any later version.                                    *
00017  *                                                                         *
00018  *  This program is distributed in the hope that it will be useful,        *
00019  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
00020  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
00021  *  GNU General Public License for more details.                           *
00022  *                                                                         *
00023  *   You should have received a copy of the GNU General Public License     *
00024  *   along with this program; if not, write to the Free Software           *
00025  *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
00026  *   Boston, MA  02110-1301  USA                                           *
00027  *                                                                         *
00028  ***************************************************************************/
00029 
00030 #ifndef LOGIT_SCALE_ENGINE_H
00031 #define LOGIT_SCALE_ENGINE_H
00032 
00033 #include <qwt_scale_engine.h>
00034 #include <qwt_scale_map.h>
00035 #include <ScaleEngine.h>
00036 
00037 class LogitScaleTransformation: public ScaleTransformation
00038 {
00039 public:
00040     LogitScaleTransformation(const ScaleEngine *engine):ScaleTransformation(engine){};
00041     virtual double xForm(double x, double, double, double p1, double p2) const;
00042     virtual double invXForm(double x, double s1, double s2, double p1, double p2) const;
00043     QwtScaleTransformation* copy() const;
00044 
00045 private:
00046     double func(double x) const;
00047     double invFunc(double x) const;
00048 };
00049 
00050 class LogitScaleEngine: public QwtScaleEngine
00051 {
00052 public:
00053     virtual void autoScale(int,
00054         double &x1, double &x2, double &stepSize) const;
00055 
00056     virtual QwtScaleDiv divideScale(double x1, double x2,
00057         int numMajorSteps, int numMinorSteps,
00058         double stepSize = 0.0) const;
00059 
00060     virtual QwtScaleTransformation *transformation() const;
00061 
00062 private:
00063     void buildTicks(const QwtDoubleInterval &, int stepSize,
00064         QwtValueList ticks[QwtScaleDiv::NTickTypes]) const;
00065 
00066     QwtValueList buildMajorTicks(
00067         const QwtDoubleInterval &interval, int stepSize) const;
00068 };
00069 
00070 #endif