use qhull to generate convex hulls from polygons and point sets

Use qhull from the University of Minnesota Geometry Center to generate convex hulls from point sets or polygons: http://www.geom.umn.edu/software/download/qhull.html local-copy of Version 2.5

If qhull is found in your environment a "ConvexHull" tool will automatically get added to the toolbar of each ivtools drawing editor (except idraw).

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