swplot.zoom(mode) controls the zoom (angle of view of the virtual
camera) level on the active [swplot] figure.
swplot.zoom(mode, hFigure) controls the zoom on the swplot figure
referenced by the
- Either a number determining the relative zoom value, or
'auto'that zooms to fit every object into the figure.
- Handle of the swplot figure, default value is the active swplot figure.