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src/qwt/src/qwt_scale_map.h
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00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
00002  * Qwt Widget Library
00003  * Copyright (C) 1997   Josef Wilgen
00004  * Copyright (C) 2002   Uwe Rathmann
00005  * 
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the Qwt License, Version 1.0
00008  *****************************************************************************/
00009 
00010 #ifndef QWT_SCALE_MAP_H
00011 #define QWT_SCALE_MAP_H
00012 
00013 #include "qwt_global.h"
00014 #include "qwt_math.h"
00015 
00019 class QWT_EXPORT QwtScaleTransformation
00020 {
00021 public:
00022     enum Type
00023     {
00024         Linear,
00025         Log10,
00026 
00027         Other
00028     };
00029 
00030     QwtScaleTransformation(Type type);
00031     virtual ~QwtScaleTransformation();
00032 
00033     virtual double xForm(double x, double s1, double s2,
00034         double p1, double p2) const;
00035     virtual double invXForm(double x, double s1, double s2,
00036         double p1, double p2) const;
00037 
00038     inline Type type() const { return d_type; }
00039     
00040     virtual QwtScaleTransformation *copy() const;
00041 
00042 private:
00043     QwtScaleTransformation();
00044     QwtScaleTransformation &operator=( const QwtScaleTransformation);
00045 
00046     const Type d_type;
00047 };
00048 
00055 class QWT_EXPORT QwtScaleMap
00056 {
00057 public:
00058     QwtScaleMap();
00059     QwtScaleMap(const QwtScaleMap&);
00060 
00061     ~QwtScaleMap();
00062 
00063     QwtScaleMap &operator=(const QwtScaleMap &);
00064 
00065     void setTransformation(QwtScaleTransformation * );
00066     const QwtScaleTransformation *transformation() const;
00067 
00068     void setPaintInterval(int p1, int p2);
00069     void setPaintXInterval(double p1, double p2);
00070     void setScaleInterval(double s1, double s2);
00071 
00072     int transform(double x) const;
00073     double invTransform(double i) const;
00074 
00075     double xTransform(double x) const;
00076 
00077     inline double p1() const;
00078     inline double p2() const;
00079 
00080     inline double s1() const;
00081     inline double s2() const;
00082 
00083     inline double pDist() const;
00084     inline double sDist() const;
00085 
00086     QT_STATIC_CONST double LogMin;
00087     QT_STATIC_CONST double LogMax;
00088 
00089 private:
00090     void newFactor();   
00091 
00092     double d_s1, d_s2;     // scale interval boundaries
00093     double d_p1, d_p2;     // paint device interval boundaries
00094 
00095     double d_cnv;       // conversion factor
00096 
00097     QwtScaleTransformation *d_transformation;
00098 };
00099 
00103 inline double QwtScaleMap::s1() const 
00104 {
00105     return d_s1;
00106 }
00107 
00111 inline double QwtScaleMap::s2() const 
00112 {
00113     return d_s2;
00114 }
00115 
00119 inline double QwtScaleMap::p1() const 
00120 {
00121     return d_p1;
00122 }
00123 
00127 inline double QwtScaleMap::p2() const 
00128 {
00129     return d_p2;
00130 }
00131 
00132 inline double QwtScaleMap::pDist() const
00133 {
00134     return qwtAbs(d_p2 - d_p1);
00135 }
00136 
00137 inline double QwtScaleMap::sDist() const
00138 {
00139     return qwtAbs(d_s2 - d_s1);
00140 }
00141 
00146 inline double QwtScaleMap::xTransform(double s) const
00147 {
00148     // try to inline code from QwtScaleTransformation
00149 
00150     if ( d_transformation->type() == QwtScaleTransformation::Linear )
00151         return d_p1 + (s - d_s1) * d_cnv;
00152 
00153     if ( d_transformation->type() == QwtScaleTransformation::Log10 )
00154         return d_p1 + log(s / d_s1) * d_cnv;
00155 
00156     return d_transformation->xForm(s, d_s1, d_s2, d_p1, d_p2 );
00157 }
00158 
00163 inline double QwtScaleMap::invTransform(double p) const
00164 {
00165     return d_transformation->invXForm(p, d_p1, d_p2, d_s1, d_s2 );
00166 }
00167 
00175 inline int QwtScaleMap::transform(double s) const
00176 {
00177     return qRound(xTransform(s));
00178 }
00179 
00180 #endif
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