Added option to clear Google Earth trails

images/earth.html

@@ -142,7 +142,8 @@ function createAircraft(id, type, color)
           aircraft[id] = planePlacemark;
           attitudes[id] = planeOrient;
           aircraftLocations[id] = planeLoc;
-		  aircraftLastLocations[id] = ge.createLocation('');
+	aircraftLastLocations[id] = ge.createLocation('');
+	aircraftColors[id] = color;
           //planeColor = color;
           
           createTrail(id, color);
@@ -189,6 +190,12 @@ function showTrail(id)
 	trailsVisible[id] = true;
 }
 
+function startTrail(id)
+{
+	createTrail(id, trailColors[id]);
+	trailsVisible[id] = true;
+}
+
 function setViewRange(dist)
 {
 	currViewRange = dist;

src/ui/map3D/QGCGoogleEarthView.cc

@@ -151,6 +151,20 @@ void QGCGoogleEarthView::updateGlobalPosition(UASInterface* uas, double lon, dou
     //qDebug() << QString("addTrailPosition(%1, %2, %3, %4);").arg(uas->getUASID()).arg(lat, 0, 'f', 15).arg(lon, 0, 'f', 15).arg(alt, 0, 'f', 15);
 }
 
+void QGCGoogleEarthView::clearTrail()
+{
+    // Check if the current trail has to be hidden
+    if (trailEnabled && !state)
+    {
+        QList<UASInterface*> mavs = UASManager::instance()->getUASList();
+        foreach (UASInterface* currMav, mavs)
+        {
+            javaScript(QString("clearTrail(%1);").arg(currMav->getUASID()));
+            javaScript(QString("startTrail(%1);").arg(currMav->getUASID()));
+        }
+    }
+}
+
 void QGCGoogleEarthView::showTrail(bool state)
 {
     // Check if the current trail has to be hidden
@@ -159,7 +173,7 @@ void QGCGoogleEarthView::showTrail(bool state)
         QList<UASInterface*> mavs = UASManager::instance()->getUASList();
         foreach (UASInterface* currMav, mavs)
         {
-            javaScript(QString("hideTrail(%1);").arg(currMav->getUASID()));
+            javaScript(QString("clearTrail(%1);").arg(currMav->getUASID()));
         }
     }
 
@@ -344,6 +358,9 @@ void QGCGoogleEarthView::initializeGoogleEarth()
             ui->trailCheckbox->setChecked(trailEnabled);
             connect(ui->trailCheckbox, SIGNAL(toggled(bool)), this, SLOT(showTrail(bool)));
 
+            // Clear trail button
+            connect(ui->clearTrailButton, SIGNAL(clicked()), this, SLOT(clearTrail()));
+
             // Go home
             connect(ui->goHomeButton, SIGNAL(clicked()), this, SLOT(goHome()));
 

src/ui/map3D/QGCGoogleEarthView.h

@@ -82,6 +82,8 @@ public slots:
     void setActiveUAS(UASInterface* uas);
     /** @brief Update the global position */
     void updateGlobalPosition(UASInterface* uas, double lon, double lat, double alt, quint64 usec);
+    /** @brief Clear the existing vehicle trails */
+    void clearTrail();
     /** @brief Show the vehicle trail */
     void showTrail(bool state);
     /** @brief Show the waypoints */