I need help with create widget by state

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1

Hi, I try create widget for example line widget by state. I create line widget on scene next I remove it and I would like to create the same widget in the same place on scene from state of the widget but I don’t know how I can because I get error:

"No vtk class found for Object of type vtkWidgetState"
and "Cannot read properties of null (reading 'getWidgetForView')"

my try is:

state = widget.getState().widgetState - (I get key and value with parameters of widget)
widgetManager.addWidget(vtk(state));

Someone help me and tell me how can I create widget and other elements by state?

2

I assume you are trying to serialize and deserialize widget states. AFAIK calling getState() on a vtkWidgetState instance and then trying to rehydrate with vtk(state) won’t work as intended. I think vtkWidgetState isn’t registered as a constructor, since you can build many different kinds (class shapes) of vtkWidgetState.

Your better option is to construct your own serialization and deserialization methods, like so:

state = {
  linePoint1: widget.getWidgetState().getLinePoint1().getOrigin(),
  linePoint2: widget.getWidgetState().getLinePoint2().getOrigin(),
};

... // create a new widget state called "widgetState"
widgetState.getLinePoint1().setOrigin(...state.linePoint1);
widgetState.getLinePoint2().setOrigin(...state.linePoint2);
3

Thanks for your answer it work but when I create line I have handles and I start from point 1 and end in point 2 (screen with green handles) if I recreate the line by state I’ve not the handles. Could you give me tips why?

state.getHandle1().setOrigin(...this.outputData.handle1.origin);
state.getHandle2().setOrigin(...this.outputData.handle2.origin);
state.getMoveHandle().setOrigin(...this.outputData.moveHandle);

I attached piece of screenshot

LineWidget

4

With the DistanceWidget itself, the handles also have visibility state. You can toggle this with “getHandle1().setVisible(true)”.