Private center_center of simRect in panMap screen coords
Private panSimView's initial CoordMap at mouse down event, for SimView panning. We keep the initial coordmap because later we will do SimView.setSimRect which will change the SimView's coordmap.
Private start_initial mouse down location in LabCanvas screen coords
Private view_the SimView being panned
Modifies the SimView so it is translated by the distance and direction the mouse has moved since the initial mouse down.
current mouse position in screen coordinates
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Pans (scrolls) a SimView to follow mouse movements. See SimView Panning in SimController.