How to create pyramidal graph with bar chart and series: stacking: 'pyramidal'
To create a pyramidal chart in first time, it's necesary to add over line 4816 of hightcharts.src.js the next code:
if (stacking == 'pyramidal'){
yValue = yValue - yBottom;
}
To show a pyramidal chart, the plotOptions can be set:
plotOptions: {
series: {
stacking: 'pyramidal'
}
Finally one of the series can be with negatives values to show de bar opposite with the other serie.
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The change above gave me this chart... http://screencast.com/t/Zjc0YjYyMTMt
What is it supposed to look like?