## Ctioga is deprecated

As of now (Mon Jan 31 2011), the use of Ctioga is deprecated, in favor
of its full rewrite
`ctioga2`

. Development had stopped
already two years ago. Please use
`ctioga2`

, which is now mature enough
to serve as a full replacement of Ctioga, but provides much more
features, such as XYZ color maps.

You may be interested in
this page
to help you transition to `ctioga2`

.

## Filled curves

Starting from `ctioga`

version 1.5, it is possible to produce
cool-looking filled curves, such as the following:

ctioga --xpdf --math --theme pastel \ --fill y_axis --fill-transparency 0.5 \ 'sin(x)' 'cos(x)'

You can play around with the various boundaries for filling:

ctioga --xpdf --math --theme pastel \ --fill bottom --fill-transparency 0.5 \ 'sin(x)' 'cos(x)'

## Filled regions

Starting from `ctioga`

1.6, it is also possible to fill space
**between** curves, which is fairly trickier. Lets start with the
simplest one:

ctioga --xpdf --math --math-xrange -1.5:1.5 \ --theme pastel --region --region-color Wheat \ 'x**2' '1 - x**2' --end

Be careful, as **order matters**:

ctioga --xpdf --math --math-xrange -1.5:1.5 \ --theme pastel --region --region-color Wheat \ '1 - x**2' 'x**2' --end

You could also have filled both regions:

ctioga --xpdf --math --math-xrange -1.5:1.5 \ --theme pastel --region --region-color Wheat \ --region-fill-twice \ 'x**2' '1 - x**2' --end