perf: Improve polygon render performance

src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp

@@ -34,6 +34,7 @@ void OpenPolyAnnotationActor::BuildShape() {
     QString stamp = QString("%1-%2").arg(BaseDataPoints->GetMTime())
             .arg(Renderer->GetActiveCamera()->GetMTime());
     if (mRenderTime == stamp) return;
+    mRenderTime = stamp;
     RebuildRenderPoint();
     vtkNew<vtkPolyLineSource> source;
     source->SetClosed(this->Closed);
@@ -65,6 +66,7 @@ void OpenPolyAnnotationActor::BuildShape() {
 void OpenPolyAnnotationActor::SetPointWorldPosition(vtkIdType index, double x, double y, double z) {
 
     BaseDataPoints->SetPoint(index, x, y, z);
+    BaseDataPoints->Modified();
 }
 
 bool OpenPolyAnnotationActor::onMeasureLeftButtonDown(vtkRenderWindowInteractor * iren) {
@@ -84,6 +86,7 @@ bool OpenPolyAnnotationActor::onMeasureLeftButtonDown(vtkRenderWindowInteractor
     controlP->AddObserver(vtkCommand::LeaveEvent, this, &OpenPolyAnnotationActor::HighlightOff);
     controlPointList.push_back(controlP);
     controlP->Index = BaseDataPoints->InsertNextPoint( p);
+    BaseDataPoints->Modified();
     this->SetRenderer(renderer);
     iren->Render();
     return true;
@@ -152,6 +155,7 @@ void OpenPolyAnnotationActor::selfDragCb(vtkObject *, unsigned long event, void
         MapScreenPointToWorld(pos[0], pos[1], this->Renderer, result);
         controlPointList[i]->SetWorldPosition(result);
     }
+    BaseDataPoints->Modified();
 }
 
 void OpenPolyAnnotationActor::controlPointCb(vtkObject *sender, unsigned long event, void *data) {
@@ -161,6 +165,7 @@ void OpenPolyAnnotationActor::controlPointCb(vtkObject *sender, unsigned long ev
     double result[3] = {0, 0, 0};
     MapScreenPointToWorld(pos[0], pos[1], this->Renderer, result);
     BaseDataPoints->SetPoint(index, result);
+    BaseDataPoints->Modified();
     UpdatePerimeterAndAreaText();
 }