Filled Areas

Connected to the bitmap capability, GREG can also produce filled curves, histograms or pie charts. The option /FILL of commands CONNECT HISTOGRAM and ELLIPSE are used for hat.

• CONNECT /FILL Colour
  closes the polygon and fills it with the current or specified Colour. This is incompatible with blanking values.

• HISTOGRAM /FILL Colour
  fills the histogram with the current or specified colour. It is intended to be used in conjunction with the /BASE option.

• ELLIPSE /FILL Colour
  fills the ellipse with the current or specified Colour. If the /ARC option is also present, the corresponding ``part of the pie'' is filled rather than the subtended arc.

So far, no filling pattern is available.

Contours can also be filled automatically, using command RGMAP /GREY. The RGMAP /GREY command does not use the current pen, but scans pencil colours from 8 to 24, changing the pencil colour by 1 for each new contour. Colours can later be edited using the look-up table facilities provided by GREG (see below).

Finally, the polygon defined by command POLYGON can be filled using the POLYGON/FILL Colour command, where Colour is a pen color (0 through 23).