Re #11422 Added GUI elements to select X^n scaling and input "n"

Code/Mantid/MantidPlot/src/ScaleDetails.cpp

@@ -99,6 +99,13 @@ ScaleDetails::ScaleDetails(ApplicationWindow* app, Graph* graph, int mappedaxis,
   middleLayout->addWidget(m_lblScaleTypeLabel, 2, 0);
   middleLayout->addWidget(m_cmbScaleType, 2, 1);
 
+  m_lblN = new QLabel(tr("n ="));
+  m_dspnN = new DoubleSpinBox();
+  m_dspnN->setLocale(m_app->locale());
+  m_dspnN->setDecimals(m_app->d_graphing_digits);
+  middleLayout->addWidget(m_lblN, 3, 0);
+  middleLayout->addWidget(m_dspnN, 3, 1);
+
   m_chkInvert = new QCheckBox();
   m_chkInvert->setText(tr("Inverted"));
   m_chkInvert->setChecked(false);

Code/Mantid/MantidPlot/src/ScaleDetails.h

@@ -74,13 +74,13 @@ private:
   ApplicationWindow* m_app;
   Graph* m_graph;
 
-  DoubleSpinBox *m_dspnEnd, *m_dspnStart, *m_dspnStep, *m_dspnBreakStart, *m_dspnBreakEnd, *m_dspnStepBeforeBreak, *m_dspnStepAfterBreak;
+  DoubleSpinBox *m_dspnEnd, *m_dspnStart, *m_dspnStep, *m_dspnBreakStart, *m_dspnBreakEnd, *m_dspnStepBeforeBreak, *m_dspnStepAfterBreak, *m_dspnN;
   QCheckBox *m_chkInvert, *m_chkLog10AfterBreak, *m_chkBreakDecoration;
   QRadioButton *m_radStep, *m_radMajor;
   QSpinBox *m_spnMajorValue, *m_spnBreakPosition, *m_spnBreakWidth;
   QGroupBox *m_grpAxesBreaks;
   QComboBox *m_cmbMinorTicksBeforeBreak, *m_cmbMinorTicksAfterBreak, *m_cmbScaleType, *m_cmbMinorValue, *m_cmbUnit;
-  QLabel *m_lblScaleTypeLabel, *m_lblMinorBox, *m_lblStart, *m_lblEnd;
+  QLabel *m_lblScaleTypeLabel, *m_lblMinorBox, *m_lblStart, *m_lblEnd, *m_lblN;
   QDateTimeEdit *m_dteStartDateTime, *m_dteEndDateTime;
   QTimeEdit *m_timStartTime, *m_timEndTime;
 

Code/Mantid/MantidPlot/src/plot2D/PowerScaleEngine.h

@@ -37,7 +37,7 @@
 class PowerScaleTransformation: public ScaleTransformation
 {
 public:
-	PowerScaleTransformation(const ScaleEngine *engine):ScaleTransformation(engine){nth_power = 2.0;};
+	PowerScaleTransformation(const ScaleEngine *engine):ScaleTransformation(engine){nth_power = -1.0;};
 	virtual double xForm(double x, double, double, double p1, double p2) const;
 	virtual double invXForm(double x, double s1, double s2, double p1, double p2) const;
 	QwtScaleTransformation* copy() const;