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