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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;
00093 double d_p1, d_p2;
00094
00095 double d_cnv;
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
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