From fa711bd27cbebc77c649a36fcd319dc9d393e1a7 Mon Sep 17 00:00:00 2001
From: Dan Nixon <dan@dan-nixon.com>
Date: Thu, 15 Jan 2015 17:03:32 +0000
Subject: [PATCH] Add a zoomer and panner to the UI

Zooming not working properly yet, cannot zoom using mouse wheel with pan

Refs #10802
---
 .../MantidQtCustomInterfaces/DataComparison.h | 10 ++++
 .../DataComparison.ui                         | 41 +++++++++++++++--
 .../CustomInterfaces/src/DataComparison.cpp   | 46 ++++++++++++++++++-
 3 files changed, 93 insertions(+), 4 deletions(-)

diff --git a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.h b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.h
index b3291237f0cd..8baedca5cf49 100644
--- a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.h
+++ b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.h
@@ -12,6 +12,8 @@
 
 #include <qwt_plot.h>
 #include <qwt_plot_curve.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_zoomer.h>
 
 
 namespace MantidQt
@@ -49,6 +51,10 @@ namespace CustomInterfaces
     void updatePlot();
     /// Handles creating and plotting a diff worksapce
     void plotDiffWorkspace();
+    /// Toggle the pan plot tool
+    void togglePan(bool enabled);
+    /// Toggle the zoom plot tool
+    void toggleZoom(bool enabled);
 
   private:
     /// Enumeration for column index
@@ -73,6 +79,10 @@ namespace CustomInterfaces
 
     // The plot object
     QwtPlot *m_plot;
+    // Plot zoom tool
+    QwtPlotZoomer *m_zoomTool;
+    // Plot pan tool
+    QwtPlotPanner *m_panTool;
     // Curves shown on plot, indexed by workspace name
     QMap<QString, boost::shared_ptr<QwtPlotCurve>> m_curves;
 
diff --git a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.ui b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.ui
index 7a9af7382e2a..474f8cddef26 100644
--- a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.ui
+++ b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/DataComparison.ui
@@ -94,14 +94,49 @@
            </property>
           </widget>
          </item>
-         <item row="2" column="0">
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QGroupBox" name="gbView">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="title">
+         <string>View</string>
+        </property>
+        <layout class="QGridLayout" name="loView">
+         <item row="0" column="0">
+          <widget class="QPushButton" name="pbPan">
+           <property name="text">
+            <string>Pan</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="1">
+          <widget class="QPushButton" name="pbZoom">
+           <property name="text">
+            <string>Zoom</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item row="1" column="0">
           <widget class="QLabel" name="lbSpectrum">
            <property name="text">
             <string>Spectrum:</string>
            </property>
           </widget>
          </item>
-         <item row="2" column="1">
+         <item row="1" column="1">
           <widget class="QSpinBox" name="sbSpectrum">
            <property name="suffix">
             <string> / 0</string>
@@ -125,7 +160,7 @@
         <property name="title">
          <string>Diff</string>
         </property>
-        <layout class="QGridLayout" name="gridLayout">
+        <layout class="QGridLayout" name="loDiff">
          <item row="0" column="0">
           <widget class="QPushButton" name="pbDiffSelected">
            <property name="text">
diff --git a/Code/Mantid/MantidQt/CustomInterfaces/src/DataComparison.cpp b/Code/Mantid/MantidQt/CustomInterfaces/src/DataComparison.cpp
index 3dead66967ba..3d23cb829e2d 100644
--- a/Code/Mantid/MantidQt/CustomInterfaces/src/DataComparison.cpp
+++ b/Code/Mantid/MantidQt/CustomInterfaces/src/DataComparison.cpp
@@ -43,6 +43,13 @@ void DataComparison::initLayout()
 {
   m_uiForm.setupUi(this);
 
+  m_zoomTool = new QwtPlotZoomer(QwtPlot::xBottom, QwtPlot::yLeft,
+      QwtPicker::DragSelection | QwtPicker::CornerToCorner, QwtPicker::AlwaysOff, m_plot->canvas());
+  m_zoomTool->setEnabled(false);
+
+  m_panTool = new QwtPlotPanner(m_plot->canvas());
+  m_panTool->setEnabled(false);
+
   // Add the plot to the UI
   m_plot->setCanvasBackground(Qt::white);
   m_uiForm.loPlot->addWidget(m_plot);
@@ -56,6 +63,9 @@ void DataComparison::initLayout()
   connect(m_uiForm.pbDiffSelected, SIGNAL(clicked()), this, SLOT(diffSelected()));
   connect(m_uiForm.pbClearDiff, SIGNAL(clicked()), this, SLOT(clearDiff()));
 
+  connect(m_uiForm.pbPan, SIGNAL(toggled(bool)), this, SLOT(togglePan(bool)));
+  connect(m_uiForm.pbZoom, SIGNAL(toggled(bool)), this, SLOT(toggleZoom(bool)));
+
   // Replot spectra when the spectrum index is changed
   connect(m_uiForm.sbSpectrum, SIGNAL(valueChanged(int)), this, SLOT(plotWorkspaces()));
 
@@ -468,7 +478,7 @@ void DataComparison::diffSelected()
   // Check there is the correct number of selected items
   if(selectedRows.size() != 2)
   {
-    g_log.error() << "Need to have only two workspaces selected for diff (have "
+    g_log.error() << "Need to have exactly 2 workspaces selected for diff (have "
                   << selectedRows.size() << ")" << std::endl;
     return;
   }
@@ -496,3 +506,37 @@ void DataComparison::clearDiff()
   // Update the plot
   plotWorkspaces();
 }
+
+
+/**
+ * Toggles the pan plot tool.
+ *
+ * @param enabled If the tool should be enabled
+ */
+void DataComparison::togglePan(bool enabled)
+{
+  // First disbale the zoom tool
+  if(enabled && m_uiForm.pbZoom->isChecked())
+  {
+    m_uiForm.pbZoom->setChecked(false);
+  }
+
+  m_panTool->setEnabled(enabled);
+}
+
+
+/**
+ * Toggles the zoom plot tool.
+ *
+ * @param enabled If the tool should be enabled
+ */
+void DataComparison::toggleZoom(bool enabled)
+{
+  // First disbale the pan tool
+  if(enabled && m_uiForm.pbPan->isChecked())
+  {
+    m_uiForm.pbPan->setChecked(false);
+  }
+
+  m_zoomTool->setEnabled(enabled);
+}