Add events when paths are started or finished (closes #1834)

include/openspace/events/event.h

@@ -77,6 +77,8 @@ struct Event {
         PointSpacecraft,
         RenderableEnabled,
         RenderableDisabled,
+        CameraPathStarted,
+        CameraPathFinished,
         Custom
     };
     constexpr explicit Event(Type type_) : type(type_) {}
@@ -520,6 +522,30 @@ struct EventRenderableDisabled : public Event {
   const tstring node;
 };
 
+/**
+ * This event is created when the a camera path is started
+ */
+struct EventCameraPathStarted : public Event {
+    static constexpr Type Type = Event::Type::CameraPathStarted;
+
+    /**
+     * Creates an instance of an EventCameraPathStarted event.
+     */
+    EventCameraPathStarted();
+};
+
+/**
+ * This event is created when the a camera path is finished
+ */
+struct EventCameraPathFinished : public Event {
+    static constexpr Type Type = Event::Type::CameraPathFinished;
+
+    /**
+     * Creates an instance of an EventCameraPathStarted event.
+     */
+    EventCameraPathFinished();
+};
+
 /**
  * A custom event type that can be used in a pinch when no explicit event type is
  * available. This should only be used in special circumstances and it should be

include/openspace/navigation/path.h

@@ -76,7 +76,7 @@ public:
     CameraPose traversePath(double dt, float speedScale = 1.f);
 
     /**
-     * Function that can be used to permaturely quit a path ,for example when skipping
+     * Function that can be used to permaturely quit a path, for example when skipping
      * to the end
      */
     void quitPath();