Workaround for inconsistent series data in unstacked area charts

[andig]

After implementation of issue #121 it is still not easily possible to create such chart:

• on initialization, validateSeries and stackData are being called before graph.renderer.unstack = true can be set
• this leads to the infamousstacked series cannot have differing numbers of points: 2 vs 6; see Rickshaw.Series.fill() exception

Workaround I've found is to subclass the area chart renderer and use that:

Rickshaw.namespace('Rickshaw.Graph.Renderer.UnstackedArea');
Rickshaw.Graph.Renderer.UnstackedArea = Rickshaw.Class.create(Rickshaw.Graph.Renderer.Area, {
    name: 'unstackedarea',
    defaults: function($super) {
        return Rickshaw.extend($super(), {
            unstack: true,
            fill: false,
            stroke: false
        });
    }
} );

This works as unstack is already true when Rickshaw.Graph gets created.

Is there a more elegant solution?

[dchester]

At the moment, this is a good workaround. We've run into this from time to time too. We'll look into moving that validation to happen around the stacking rather than from within the graph constructor.