LnScaleEngine.h

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00001 /***************************************************************************
00002     File                 : LnScaleEngine.h
00003     Project              : QtiPlot
00004     --------------------------------------------------------------------
00005     Copyright            : (C) 2009 by Ion Vasilief
00006     Email (use @ for *)  : ion_vasilief*yahoo.fr
00007     Description          : Engine for ln 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 LN_SCALE_ENGINE_H
00031 #define LN_SCALE_ENGINE_H
00032 
00033 #include <qwt_scale_engine.h>
00034 #include <qwt_scale_map.h>
00035 
00036 class LnScaleEngine: public QwtScaleEngine
00037 {
00038 public:
00039     virtual void autoScale(int maxSteps,
00040         double &x1, double &x2, double &stepSize) const;
00041 
00042     virtual QwtScaleDiv divideScale(double x1, double x2,
00043         int numMajorSteps, int numMinorSteps,
00044         double stepSize = 0.0) const;
00045 
00046     virtual QwtScaleTransformation *transformation() const;
00047 
00048 protected:
00049     QwtDoubleInterval ln(const QwtDoubleInterval&) const;
00050 
00051 private:
00052     QwtDoubleInterval align(const QwtDoubleInterval&,
00053         double stepSize) const;
00054 
00055     void buildTicks(
00056         const QwtDoubleInterval &, double stepSize, int maxMinSteps,
00057         QwtValueList ticks[QwtScaleDiv::NTickTypes]) const;
00058 
00059     QwtValueList buildMinorTicks(const QwtValueList& majorTicks,
00060         int maxMinMark, double step) const;
00061 
00062     QwtValueList buildMajorTicks(
00063         const QwtDoubleInterval &interval, double stepSize) const;
00064 };
00065 
00066 #endif

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