Rectangular selections from 2D piddles are easy and fast with the range operator. However, I would like to grab a non-rectangular selection out of a piddle, setting all out-of-area-of-interest elements to BAD.
Background -- - The user clicks on a map and creates an irregular polygon - I (somehow **) figure out the piddle elements, aka cells, that lie within the drawn poly - Out of the base piddle, I grab the tightest rect that contains the cells within the drawn poly (the min. bounding box) - Set all the cells outside the drawn poly to BAD so they don't figure in the rest of the calculations I searched the docs, but the closest discussion I found was on convex-hulls from June 2005 [1]. Suggestions? ** the reason I say "somehow" is because I can do a lookup using a database to get the indices of the mouse-clicks, and the elements that lie within the bounding rect, but I would prefer to do this without a database. I am generally finding PDL to be substantively faster than a database, and would like to stay out of a db as much as possible. I initiated a discussion on this a while back, but that was restricted to rectangular selects. [1] http://mailman.jach.hawaii.edu/pipermail/perldl/2005-June/000036.html -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science ======================================================================= _______________________________________________ Perldl mailing list [email protected] http://mailman.jach.hawaii.edu/mailman/listinfo/perldl
