specifies a viewport for the final image. The pair
(W,H) gives the
dimensions (width and height) of the final image, in
Z is the zoom factor, i.e., the image in the original layout will be
H/Z points in size. By default,
The optional last part is either a pair
(x,y) giving a position in the original layout of the
points, of the center of the viewport, or the name
of a node whose center should used as the focus.
By default, the focus is the center of the graph bounding box, i.e.,
"bbx,bby" is the
value of the bounding box attribute
50,50,.5,'2.8 BSD' or
The first will take the 100x100 point square centered on the node
and scale it down by 0.5, yielding a 50x50 point final image.
viewPortis a valid type for: