Detailed Description

This tutorial illustrates how to create an histogram with polygonal bins (TH2Poly), fill it and draw it using GL.

The initial data are stored in TMultiGraphs. They represent the USA.

The initial data have been downloaded from: http://www.maproom.psu.edu/dcw/ This database was developed in 1991/1992 and national boundaries reflect political reality as of that time.

Definition in file th2polyUSA.C.