A lot of work. Firstly you would want to use the "done" callback from
the polygon handler to actually do the work. This gives you the polygon
geometry. You can loop through the geometry to get each line sequence
from which Pythagoras would give you the length. However, to add the
dimensions, I think you are on your own. You will get the renderer and
draw directly onto it. The problematic bit would be dealing with
overlaps. An alternative would to add the dimensions as features
themselves (create the geometry for them) in a separate drawing layer.
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