Deprecated; see unregisterCallback Unregister a previously registered callback.

Unregister a previously registered callback.

called by timer at 30 Hz

This function is connected to ``sigChanged`` of every parameter associated with it. This way, those parameters don't have to be queri

Modify the OpenGL state options to use immediately before drawing this item. *opts* must be a dictionary as specified by setGLOptions

Return the screen geometry of the viewbox. Returns ------- QRectF The QRectF instance that contains the

Called when the view widget/viewbox is resized/rescaled

Return the visible bounds of this item's ViewBox or GraphicsWidget, in the local coordinate system of the item.

Decorator that catches/ignores exceptions and prints a stack trace.

Called when the widget's value is changing, but not finalized. For example: editing text before pressing enter or changing focus.