BackgroundPlotter closing event (#293)
BackgroundPlotter closing event (#293)

* Fix closeEvent() and start RenderThread based on QThread

* USe QThread for the rendering thread

* Clean code

* Fix waiting time

* Override close method

* Fix sleeping time

* Fix issues with sequential ipython calls

* Simplify triggering of the rendering

* Force rendering

* Fix window/timer connection

* better traceback when missing pyqt5

akaszynski/vtkInterface