Fixed logging time base

src/ui/MainWindow.cc

@@ -1375,23 +1375,8 @@ void MainWindow::loadWidgets()
     //loadPilotView();
 }
 
-void MainWindow::loadDataView()
-{
-    clearView();
-
-    // DATAPLOT
-    if (dataplotWidget)
-    {
-        QStackedWidget *centerStack = dynamic_cast<QStackedWidget*>(centralWidget());
-        if (centerStack)
-            centerStack->setCurrentWidget(dataplotWidget);
-    }
-}
-
 void MainWindow::loadDataView(QString fileName)
 {
-    clearView();
-
     // DATAPLOT
     if (dataplotWidget)
     {

src/ui/MainWindow.h

@@ -151,8 +151,6 @@ public slots:
     void loadWidgets();
 
     /** @brief Load data view, allowing to plot flight data */
-    void loadDataView();
-    /** @brief Load data view, allowing to plot flight data */
     void loadDataView(QString fileName);
 
     /** @brief Load 3D map view */

src/ui/QGCDataPlot2D.cc

@@ -126,6 +126,13 @@ void QGCDataPlot2D::savePlot()
     fileName = QFileDialog::getSaveFileName(
             this, "Export File Name", QDesktopServices::storageLocation(QDesktopServices::DesktopLocation),
             "PDF Documents (*.pdf);;SVG Images (*.svg)");
+
+    if (!fileName.contains("."))
+    {
+        // .csv is default extension
+        fileName.append(".pdf");
+    }
+
     while(!(fileName.endsWith(".svg") || fileName.endsWith(".pdf")))
     {
         QMessageBox msgBox;

src/ui/linechart/LinechartPlot.cc

@@ -57,7 +57,7 @@ maxTime(QUINT64_MIN),
 maxInterval(MAX_STORAGE_INTERVAL),
 timeScaleStep(DEFAULT_SCALE_INTERVAL), // 10 seconds
 automaticScrollActive(false),
-m_active(true),
+m_active(false),
 m_groundTime(true),
 d_data(NULL),
 d_curve(NULL)
@@ -286,6 +286,14 @@ void LinechartPlot::enforceGroundTime(bool enforce)
     m_groundTime = enforce;
 }
 
+/**
+ * @return True if the data points are stamped with the packet receive time
+ */
+bool LinechartPlot::groundTime()
+{
+    return m_groundTime;
+}
+
 void LinechartPlot::addCurve(QString id)
 {
     QColor currentColor = getNextColor();
@@ -469,6 +477,23 @@ bool LinechartPlot::isVisible(QString id)
 }
 
 /**
+ * @return The visibility, true if it is visible, false otherwise
+ **/
+bool LinechartPlot::anyCurveVisible()
+{
+    bool visible = false;
+    foreach (QString key, curves.keys())
+    {
+        if (curves.value(key)->isVisible())
+        {
+            visible = true;
+        }
+    }
+
+    return visible;
+}
+
+/**
  * @brief Allows to block interference of the automatic scrolling with user interaction
  * When the plot is updated very fast (at 1 ms for example) with new data, it might
  * get impossible for an user to interact. Therefore the automatic scrolling must be

src/ui/linechart/LinechartPlot.h

@@ -190,6 +190,8 @@ public:
 
     QList<QwtPlotCurve*> getCurves();
     bool isVisible(QString id);
+    /** @brief Check if any curve is visible */
+    bool anyCurveVisible();
 
     int getPlotId();
     /** @brief Get the number of values to average over */
@@ -243,6 +245,8 @@ public slots:
 
     /** @brief Enforce the use of the receive timestamp */
     void enforceGroundTime(bool enforce);
+    /** @brief Check if the receive timestamp is enforced */
+    bool groundTime();
 
     // General interaction
     void setWindowPosition(quint64 end);

src/ui/linechart/LinechartWidget.cc

@@ -48,6 +48,7 @@ This file is part of the PIXHAWK project
 #include "LinechartWidget.h"
 #include "LinechartPlot.h"
 #include "LogCompressor.h"
+#include "QGC.h"
 #include "MG.h"
 
 
@@ -225,7 +226,18 @@ void LinechartWidget::appendData(int uasId, QString curve, double value, quint64
     {
         if (activePlot->isVisible(curve))
         {
-            logFile->write(QString(QString::number(usec) + "\t" + QString::number(uasId) + "\t" + curve + "\t" + QString::number(value) + "\n").toLatin1());
+            quint64 time = 0;
+            // Adjust time
+            if (activePlot->groundTime())
+            {
+                time = QGC::groundTimeUsecs() - logStartTime;
+            }
+            else
+            {
+                time = usec - logStartTime;
+            }
+
+            logFile->write(QString(QString::number(time) + "\t" + QString::number(uasId) + "\t" + curve + "\t" + QString::number(value) + "\n").toLatin1());
             logFile->flush();
         }
     }
@@ -261,14 +273,35 @@ void LinechartWidget::refresh()
 
 void LinechartWidget::startLogging()
 {
-    // Let user select the log file name
-    QDate date(QDate::currentDate());
-    // QString("./pixhawk-log-" + date.toString("yyyy-MM-dd") + "-" + QString::number(logindex) + ".log")
-    QString fileName = QFileDialog::getSaveFileName(this, tr("Specify log file name"), QDesktopServices::storageLocation(QDesktopServices::DesktopLocation), tr("Logfile (*.txt, *.csv);;"));
     // Store reference to file
     // Append correct file ending if needed
     bool abort = false;
-    while (!(fileName.endsWith(".txt") || fileName.endsWith(".csv")))
+
+    // Check if any curve is enabled
+    if (!activePlot->anyCurveVisible())
+    {
+        QMessageBox msgBox;
+        msgBox.setIcon(QMessageBox::Critical);
+        msgBox.setText("No curves selected for logging.");
+        msgBox.setInformativeText("Please check all curves you want to log. Currently no data would be logged, aborting the logging.");
+        msgBox.setStandardButtons(QMessageBox::Ok);
+        msgBox.setDefaultButton(QMessageBox::Ok);
+        msgBox.exec();
+        return;
+    }
+
+    // Let user select the log file name
+    QDate date(QDate::currentDate());
+    // QString("./pixhawk-log-" + date.toString("yyyy-MM-dd") + "-" + QString::number(logindex) + ".log")
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Specify log file name"), QDesktopServices::storageLocation(QDesktopServices::DesktopLocation), tr("Logfile (*.csv, *.txt);;"));
+
+    if (!fileName.contains("."))
+    {
+        // .csv is default extension
+        fileName.append(".csv");
+    }
+
+    while (!(fileName.endsWith(".txt") || fileName.endsWith(".csv")) && !abort)
     {
         QMessageBox msgBox;
         msgBox.setIcon(QMessageBox::Critical);
@@ -292,6 +325,7 @@ void LinechartWidget::startLogging()
         if (logFile->open(QIODevice::WriteOnly | QIODevice::Text))
         {
             logging = true;
+            logStartTime = QGC::groundTimeUsecs();
             logindex++;
             logButton->setText(tr("Stop logging"));
             disconnect(logButton, SIGNAL(clicked()), this, SLOT(startLogging()));

src/ui/linechart/LinechartWidget.h

@@ -131,6 +131,7 @@ protected:
     bool logging;
     QTimer* updateTimer;
     LogCompressor* compressor;
+    quint64 logStartTime;
 
     static const int MAX_CURVE_MENUITEM_NUMBER = 8;
     static const int PAGESTEP_TIME_SCROLLBAR_VALUE = (MAX_TIME_SCROLLBAR_VALUE - MIN_TIME_SCROLLBAR_VALUE) / 10;