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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 Type type() const;
00039
00040 virtual QwtScaleTransformation *copy() const;
00041
00042 private:
00043 QwtScaleTransformation();
00044 QwtScaleTransformation &operator=( const QwtScaleTransformation);
00045
00046 const Type d_type;
00047 };
00048
00050 inline QwtScaleTransformation::Type QwtScaleTransformation::type() const
00051 {
00052 return d_type;
00053 }
00054
00061 class QWT_EXPORT QwtScaleMap
00062 {
00063 public:
00064 QwtScaleMap();
00065 QwtScaleMap(const QwtScaleMap&);
00066
00067 ~QwtScaleMap();
00068
00069 QwtScaleMap &operator=(const QwtScaleMap &);
00070
00071 void setTransformation(QwtScaleTransformation * );
00072 const QwtScaleTransformation *transformation() const;
00073
00074 void setPaintInterval(double p1, double p2);
00075 void setScaleInterval(double s1, double s2);
00076
00077 int transform(double x) const;
00078 double invTransform(double i) const;
00079
00080 double xTransform(double x) const;
00081
00082 double p1() const;
00083 double p2() const;
00084
00085 double s1() const;
00086 double s2() const;
00087
00088 double pDist() const;
00089 double sDist() const;
00090
00091 QT_STATIC_CONST double LogMin;
00092 QT_STATIC_CONST double LogMax;
00093
00094 private:
00095 void newFactor();
00096
00097 double d_s1, d_s2;
00098 double d_p1, d_p2;
00099
00100 double d_cnv;
00101
00102 QwtScaleTransformation *d_transformation;
00103 };
00104
00108 inline double QwtScaleMap::s1() const
00109 {
00110 return d_s1;
00111 }
00112
00116 inline double QwtScaleMap::s2() const
00117 {
00118 return d_s2;
00119 }
00120
00124 inline double QwtScaleMap::p1() const
00125 {
00126 return d_p1;
00127 }
00128
00132 inline double QwtScaleMap::p2() const
00133 {
00134 return d_p2;
00135 }
00136
00140 inline double QwtScaleMap::pDist() const
00141 {
00142 return qAbs(d_p2 - d_p1);
00143 }
00144
00148 inline double QwtScaleMap::sDist() const
00149 {
00150 return qAbs(d_s2 - d_s1);
00151 }
00152
00159 inline double QwtScaleMap::xTransform(double s) const
00160 {
00161
00162
00163 if ( d_transformation->type() == QwtScaleTransformation::Linear )
00164 return d_p1 + (s - d_s1) * d_cnv;
00165
00166 if ( d_transformation->type() == QwtScaleTransformation::Log10 )
00167 return d_p1 + log(s / d_s1) * d_cnv;
00168
00169 return d_transformation->xForm(s, d_s1, d_s2, d_p1, d_p2 );
00170 }
00171
00179 inline double QwtScaleMap::invTransform(double p) const
00180 {
00181 return d_transformation->invXForm(p, d_p1, d_p2, d_s1, d_s2 );
00182 }
00183
00192 inline int QwtScaleMap::transform(double s) const
00193 {
00194 return qRound(xTransform(s));
00195 }
00196
00197 #endif