Shading above and below lines

[eaburns]

Original issue 55 created by eaburns on 2012-08-11T12:42:46.000Z:

It should be possible to add shading above and below lines.

[eaburns]

Comment #1 originally posted by eaburns on 2012-08-24T20:49:23.000Z:

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[eaburns]

Comment #2 originally posted by eaburns on 2013-02-20T19:24:10.000Z:

Just need to shade the polygon defined by the points of the line and the minimum X and Y values of the plot. The user can manually use the "painter's algorithm" so that shading doesn't obscure other lines.

This can enable stacked lines plots (requested by JB).