Keywords: greg

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### 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).

Next: Bitmap Color Editing Up: Greyscale and Color plots Previous: Bitmap display of images Contents Index