remove widget implementation

modules/viz/include/opencv2/viz/viz3d.hpp

@@ -72,6 +72,7 @@ namespace temp_viz
         bool wasStopped() const;
         
         void showWidget(const String &id, const Widget &widget);
+        bool removeWidget(const String &id);
     private:
         Viz3d(const Viz3d&);
         Viz3d& operator=(const Viz3d&);

modules/viz/src/q/viz3d_impl.hpp

@@ -247,6 +247,8 @@ public:
     void setSize (int xw, int yw);
     
     void showWidget(const String &id, const Widget &widget);
+    bool removeWidget(const String &id);
+    
     void all_data();
 
 private:

modules/viz/src/viz3d.cpp

@@ -143,3 +143,8 @@ void temp_viz::Viz3d::showWidget(const String &id, const Widget &widget)
 {
     impl_->showWidget(id, widget);
 }
+
+bool temp_viz::Viz3d::removeWidget(const String &id)
+{
+    return impl_->removeWidget(id);
+}

modules/viz/src/viz3d_impl.cpp

@@ -1183,3 +1183,21 @@ void temp_viz::Viz3d::VizImpl::showWidget(const String &id, const Widget &widget
     renderer_->AddActor(WidgetAccessor::getActor(widget));
     (*widget_actor_map_)[id].actor = WidgetAccessor::getActor(widget);
 }
+
+bool temp_viz::Viz3d::VizImpl::removeWidget(const String &id)
+{
+    WidgetActorMap::iterator wam_itr = widget_actor_map_->find(id);
+    bool exists = !(wam_itr == widget_actor_map_->end());
+    
+    if (!exists)
+    {
+        std::cout << "[removeWidget] A widget with id <" << id << "> does not exist!" << std::endl;
+        return false;
+    }
+    
+    if (!removeActorFromRenderer (wam_itr->second.actor))
+        return false;
+    
+    widget_actor_map_->erase(wam_itr);
+    return true;
+}