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I know there are quite a few js & php chart libraries although I am not sure of the best method to create charts to look very similar to the image displayed below:
I am trying to create a chart that will allow me to use negative values – the tricky bit is the ‘dark grey’ overlay as I am not sure of the best library for doing this, I’ve used Google Charts but not had quite much success.
Any suggestions would be welcomed – thanks 🙂
You can achieve this easily with amCharts.com:
1) take this chart as a base: http://amcharts.com/javascript/stacked-bar-chart/
2) create 2 serial charts (you can achieve quite the same with one chart too, but it might be a bit complicated to setup labels)
3) most important – set stackType of ValueAxis to “3d”. this will make the bars to overlay as in your example.
4) set fillAlphas for the underlay graphs to <1 value so that they would be transparent.