Inches to extend the drawing area around the minimal area needed to draw the graph
type: double | point, default:
0.0555 (4 points)
pad is a single double, both the x and y pad values are set
equal to the given value. This area is part of the
drawing and will be filled with the background color, if appropriate.
Normally, a small
pad is used for aesthetic reasons, especially when
a background color is used, to avoid having nodes and edges abutting
the boundary of the drawn region.
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Last modified September 17, 2022: Update pad.md: add description (1ddb0d1)