remember user's preference for stacked view

...and add zoom.

fixes #58

src/AllPlot.cpp

@@ -603,19 +603,18 @@ AllPlot::setDataP(AllPlot *plot, int startidx, int stopidx)
     cadCurve->setData(xaxis, smoothCad);
     altCurve->setData(xaxis, smoothAltitude);
 
-    setYMax();
-
-    setAxisMaxMajor(yLeft, 5);
-    setAxisMaxMajor(yLeft2, 5);
-    setAxisMaxMajor(yRight, 5);
-    setAxisMaxMajor(yRight2, 5);
-
     wattsCurve->setVisible(plot->wattsCurve->isVisible());
     hrCurve->setVisible(plot->hrCurve->isVisible());
     speedCurve->setVisible(plot->speedCurve->isVisible());
     cadCurve->setVisible(plot->cadCurve->isVisible());
     altCurve->setVisible(plot->altCurve->isVisible());
 
+    setYMax();
+    setAxisMaxMajor(yLeft, 5);
+    setAxisMaxMajor(yLeft2, 5);
+    setAxisMaxMajor(yRight, 5);
+    setAxisMaxMajor(yRight2, 5);
+
     if (!smoothWatts.empty()) wattsCurve->attach(this);
     if (!smoothHr.empty()) hrCurve->attach(this);
     if (!smoothSpeed.empty()) speedCurve->attach(this);

src/AllPlotWindow.cpp

@@ -32,6 +32,7 @@
 #include <qwt_plot_zoomer.h>
 #include <qwt_plot_picker.h>
 #include <qwt_plot_marker.h>
+#include <qwt_arrow_button.h>
 
 AllPlotWindow::AllPlotWindow(MainWindow *mainWindow) :
     QWidget(mainWindow), mainWindow(mainWindow)
@@ -43,11 +44,32 @@ AllPlotWindow::AllPlotWindow(MainWindow *mainWindow) :
     showLayout->addWidget(showLabel);
 
     showStack = new QCheckBox(tr("Stacked view"), this);
-    showStack->setCheckState(Qt::Unchecked);
+
+    boost::shared_ptr<QSettings> settings = GetApplicationSettings();
+    if (settings->value(GC_RIDE_PLOT_STACK).toInt())
+        showStack->setCheckState(Qt::Checked);
+    else
+        showStack->setCheckState(Qt::Unchecked);
     showLayout->addWidget(showStack);
 
     stackWidth = 15;
 
+    QLabel *labelspacer = new QLabel(this);
+    labelspacer->setFixedWidth(5);
+    showLayout->addWidget(labelspacer);
+
+    stackZoomUp = new QwtArrowButton(1, Qt::UpArrow,this);
+    stackZoomUp->setFixedHeight(15);
+    stackZoomUp->setFixedWidth(15);
+    stackZoomUp->setEnabled(false);
+    showLayout->addWidget(stackZoomUp);
+
+    stackZoomDown = new QwtArrowButton(1, Qt::DownArrow,this);
+    stackZoomDown->setFixedHeight(15);
+    stackZoomDown->setFixedWidth(15);
+    stackZoomDown->setEnabled(false);
+    showLayout->addWidget(stackZoomDown);
+
     QCheckBox *showGrid = new QCheckBox(tr("Grid"), this);
     showGrid->setCheckState(Qt::Checked);
     showLayout->addWidget(showGrid);
@@ -185,6 +207,12 @@ AllPlotWindow::AllPlotWindow(MainWindow *mainWindow) :
             this, SLOT(setShowGrid(int)));
     connect(showStack, SIGNAL(stateChanged(int)),
             this, SLOT(setShowStack(int)));
+
+    connect(stackZoomUp, SIGNAL(clicked()),
+            this, SLOT(setStackZoomUp()));
+    connect(stackZoomDown, SIGNAL(clicked()),
+            this, SLOT(setStackZoomDown()));
+
     connect(comboDistance, SIGNAL(currentIndexChanged(int)),
             this, SLOT(setByDistance(int)));
     connect(smoothSlider, SIGNAL(valueChanged(int)),
@@ -617,10 +645,41 @@ AllPlotWindow::resetStackedDatas()
     }
 }
 
+void
+AllPlotWindow::setStackZoomUp()
+{
+    if (stackWidth<200 && stackWidth<allPlot->rideItem->ride()->dataPoints().last()->secs/60) {
+        stackWidth = ceil(stackWidth * 1.25);
+        stackZoomDown->setEnabled(true);
+        setShowStack(false);
+        setShowStack(true);
+        if (stackWidth>=200  || stackWidth>=allPlot->rideItem->ride()->dataPoints().last()->secs/60)
+            stackZoomUp->setEnabled(false);
+    }
+}
+
+void
+AllPlotWindow::setStackZoomDown()
+{
+    if (stackWidth>4) {
+        stackWidth = floor(stackWidth / 1.25);
+        stackZoomUp->setEnabled(true);
+        setShowStack(false);
+        setShowStack(true);
+        if (stackWidth<=4)
+            stackZoomDown->setEnabled(false);
+    }
+}
+
 void
 AllPlotWindow::setShowStack(int value)
 {
+    boost::shared_ptr<QSettings> settings = GetApplicationSettings();
+    settings->setValue(GC_RIDE_PLOT_STACK, value);
     if (value) {
+        stackZoomUp->setEnabled(true);
+        stackZoomDown->setEnabled(true);
+
         int _stackWidth = stackWidth;
         if (allPlot->byDistance())
             _stackWidth = stackWidth/3;
@@ -657,18 +716,18 @@ AllPlotWindow::setShowStack(int value)
 
             // Update AllPlot for stacked view
             _allPlot->setDataP(allPlot, startIndex, stopIndex);
-            _allPlot->setAxisScale(QwtPlot::xBottom, _stackWidth*i, _stackWidth*(i+1), 1);
+            _allPlot->setAxisScale(QwtPlot::xBottom, _stackWidth*i, _stackWidth*(i+1), 15/stackWidth);
 
             if (i==0){
                 // First plot view title and legend
                 _allPlot->setTitle(allPlot->title());
                 _allPlot->plotLayout()->setLegendPosition(QwtPlot::TopLegend);
-                _allPlot->setFixedHeight(200);
+                _allPlot->setFixedHeight(120+stackWidth*2+50);
             }
             else {
                _allPlot->setTitle("");
                _allPlot->insertLegend(NULL);
-               _allPlot->setFixedHeight(150);
+               _allPlot->setFixedHeight(120+stackWidth*2);
             }
 
             // No x axis titles
@@ -699,7 +758,7 @@ AllPlotWindow::setShowStack(int value)
         stackFrame->hide();
         allPlot->show();
 
-        if (allPlots.count()>1) {
+        if (allPlots.count()>0) {
             foreach (AllPlot *plot, allPlots) {
                 //layout()->removeWidget(plot);
                 delete plot;

src/AllPlotWindow.h

@@ -27,6 +27,7 @@ class QwtPlotPanner;
 class QwtPlotZoomer;
 class QwtPlotPicker;
 class QwtPlotMarker;
+class QwtArrowButton;
 class RideItem;
 class IntervalItem;
 
@@ -53,6 +54,9 @@ class AllPlotWindow : public QWidget
         void zonesChanged();
         void intervalsChanged();
 
+        void setStackZoomUp();
+        void setStackZoomDown();
+
         void setShowStack(int state);
         void setShowPower(int state);
         void setShowHr(int state);
@@ -82,6 +86,10 @@ class AllPlotWindow : public QWidget
         QwtPlotPicker *allPicker;
         int selection;
         QCheckBox *showStack;
+
+        QwtArrowButton *stackZoomDown;
+        QwtArrowButton *stackZoomUp;
+
 	QCheckBox *showHr;
 	QCheckBox *showSpeed;
 	QCheckBox *showCad;

src/Settings.h

@@ -32,6 +32,7 @@
 #define GC_TABS_TO_HIDE             "mainwindow/tabsToHide"
 #define GC_SETTINGS_INTERVAL_METRICS "rideSummaryWindow/intervalMetrics"
 #define GC_RIDE_PLOT_SMOOTHING       "ridePlot/Smoothing"
+#define GC_RIDE_PLOT_STACK           "ridePlot/Stack"
 #define GC_PERF_MAN_METRIC           "performanceManager/metric"
 #define GC_HIST_BIN_WIDTH            "histogamWindow/binWidth"
 #define GC_SETTINGS_INTERVAL_METRICS_DEFAULT "workout_time,total_distance,total_work,average_power,skiba_xpower,max_power,average_hr,ninety_five_percent_hr,average_cad,average_speed"