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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _pg_defaultchart function initializes all necessary variables
     in the chart environment for the chart type set by the <charttype>
     variable.
 
     All title fields in the environment structure are blanked. Titles
     should be set in the proper fields after calling _pg_defaultchart.
 
     The <charttype> argument can be set to one of the following five
     constants:
 
     _PG_BARCHART        _PG_PIECHART
     _PG_COLUMNCHART     _PG_SCATTERCHART
     _PG_LINECHART
 
     The <chartstyle> argument can be set to one of two constants. The
     two constants permitted depend on the type of the chart, as listed
     below:
 
     Chart Type     Chart Styles Available
 
     Pie            _PG_NOPERCENT, _PG_PERCENT
     Bar            _PG_PLAINBARS, _PG_STACKEDBARS
     Column         _PG_PLAINBARS, _PG_STACKEDBARS
     Line           _PG_POINTANDLINE, _PG_POINTONLY
     Scatter        _PG_POINTANDLINE, _PG_POINTONLY
 
     In a pie chart, the pieces are "exploded" according to the
     <explode> array argument in the _pg_chartpie function. In the
     "percent" format, percentages are printed next to each slice.
 
     Bar and column charts have only one style when displaying a single
     series of data. The styles "side by side" and "stacked" are
     applicable only when more than one series appears on the same
     chart.
 
     The first style arranges the bars or columns for the different
     series side by side, showing relative heights or lengths. The
     stacked style emphasizes relative sizes between bars and columns.
 
     Return Value
 
     The _pg_defaultchart function returns 0 if there were no errors. A
     nonzero value indicates a failure.
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