Added trail clear button

src/ui/map/QGCMapToolBar.cc

@@ -24,6 +24,7 @@ void QGCMapToolBar::setMap(QGCMapWidget* map)
         connect(ui->goToButton, SIGNAL(clicked()), map, SLOT(showGoToDialog()));
         connect(ui->goHomeButton, SIGNAL(clicked()), map, SLOT(goHome()));
         connect(ui->lastPosButton, SIGNAL(clicked()), map, SLOT(loadSettings()));
+        connect(ui->clearTrailsButton, SIGNAL(clicked()), map, SLOT(deleteTrails()));
         connect(map, SIGNAL(OnTileLoadStart()), this, SLOT(tileLoadStart()));
         connect(map, SIGNAL(OnTileLoadComplete()), this, SLOT(tileLoadEnd()));
         connect(map, SIGNAL(OnTilesStillToLoad(int)), this, SLOT(tileLoadProgress(int)));

src/ui/map/QGCMapToolBar.ui

@@ -6,14 +6,14 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>693</width>
+    <width>695</width>
     <height>35</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QHBoxLayout" name="horizontalLayout" stretch="1,1,1,1,1,1,100,20,1">
+  <layout class="QHBoxLayout" name="horizontalLayout" stretch="1,1,1,1,1,0,1,100,20,1">
    <property name="spacing">
     <number>12</number>
    </property>
@@ -55,6 +55,13 @@
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QPushButton" name="clearTrailsButton">
+     <property name="text">
+      <string>Clear Trails</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QCheckBox" name="followCheckBox">
      <property name="text">

src/ui/map/QGCMapWidget.h

@@ -98,6 +98,14 @@ public slots:
             }
         }
     }
+    /** @brief Delete all trails */
+    void deleteTrails()
+    {
+        foreach(mapcontrol::UAVItem* uav, GetUAVS())
+        {
+            uav->DeleteTrail();
+        }
+    }
 
     /** @brief Load the settings for this widget from disk */
     void loadSettings(bool changePosition=true);