-B<RRDtool> has now support for B<pie charts>. If you include the
-B<PART> command, the canvas is extended to make room for a chart
-(or, if no other graph elements are used, the canvas is solely
-used for the pie chart). The size of the canvas is determined by
-the lesser of L<width and height|rrdgraph/item_Size>.
-
-B<PART:>I<vname>B<#>I<rrggbbaa>[B<:>I<legend>]
-
-Draw a part of pie. Pie parts will be concatenated, the first one
-will start at the top and parts will be created clockwise.
-The size of the part is defined by the value part of
-the L<VDEF|rrdgraph_data/VDEF> function. It should return
-a number between 0 and 100, being a percentage.
-Providing wrong input will produce undefined results.
-