Fill gradient color in area under line chart with Protovis 3.2

[Huy Dinh]

I want to fill gradient color in area under line chart when I add
area.
I have tried with color functions in Protovis but they do not work.
Is there any solution for that?
Here is my code to add Area into line chart
addArea: ->
self = this
@vis.add(pv.Area)
.data(self.data[0].values)
.bottom(1)
.left((d) -> self.xAxisUnits(d.index))
.height((d) -> self.yAxisUnits(d.value))
.fillStyle(pv.ramp('black', 'red'))
.anchor("top")
.add(pv.Line)
.lineWidth(2)
.strokeStyle("#78B9E2")
this

[Mike Bostock]

Protovis does not support gradients. You can use D3 instead, which
supports gradients (and any other feature of SVG):

http://bl.ocks.org/1086421

Mike

[Huy Đinh]

Thanks for your reply.

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