draw a colour map, for example, using the data from 3D multidimensional
the result is an Encapsulated PostScript image
] [-o filename
This programs draws a map, giving each location (set off by
triangulation from other locations) a separate colour. The colours are
set in a vectorfile
which must have
vectors of size 3 (for instance, created by running the program
in 3 dimensions). The values in the
vectorfile are used as red, green, and blue colour components. The
components can have any values: each component will be scaled onto the
maximum range of permissible colour values.
See Map configuration file for the syntax
of the configfile.
Equivalent scaling of colour axes
By default, all three vector dimensions are scaled separately to map onto the
full range of its colour component, even if the range of values in one
vector dimension is much smaller than in another dimension.
The option -e changes this
behaviour. The same scaling is applied to each vector dimension. Usually, two
out of three dimension will map onto a
smaller part of the range of its colour component. In other words, there will
be less colour separation in two out of three colour components.
Raw input, no scaling of colour axes
With the option -r, no scaling on the vector dimensions is
done. All input values must be in the range from zero to one.