Overlapping bar chart

[jemcelroy]

Is it possible to create an overlapping bar chart? I took a look at the demo, but didn't see that as an option. Can the grouped bar chart be altered currently to overlap?

[liuxuan30]

take a look at how barSpace and groupSpace impact the bar rect. You may find a way to modify the barRect.Not sure if you use a negative value for barSpace and groupSpace, how much work you need.

[danielgindi]

If by "overlapping" you mean something like this:

Or this:

Then I guess it would be pretty easy to implement. Something in the area of barSpace etc- to allow playing with offsets too - on a dataset basis.
The more complicated thing could be to deal with grouped bars, but I'm not convinced that they will actually be offended by this change...

[liuxuan30]

it seems a nice feature though :)

[jemcelroy]

@danielgindi The first example is what I was looking for. After experimenting with negative values in the bar spacing (and managing to get something like the second example) I ended up throwing together a subclass of BarChartRenderer to change bar widths and positions to get something like the first example. I'd still love to see this as a built-in option, though.

[danielgindi]

Implemented in Charts 3.0 (v3 branch), you can now set the barWidth as a percentage. :-)

[jemcelroy]

@danielgindi can you help me out with how setting barWidth can provide the effect in the first example you posted in March? It looks like barWidth is only a property of BarChartData, when I want to set the relative width of a BarChartDataSet.

[liuxuan30]

@jemcelroy can you look at open func groupBars(fromX: Double, groupSpace: Double, barSpace: Double) to see if it can achieve by changing barSpace, groupSpace etc?
I'm curious as well, but barWidth is on BarChartData like you said.

[jemcelroy]

@liuxuan30 I have only been able to achieve something like the second example using the groupBars function. It seems impossible to achieve something like in the first example without being able to set the width of a BarChartDataSet.

[liuxuan30]

OK, it seems like it's not supported? need @danielgindi confirm

[jemcelroy]

Still would love to see this as a feature so I don't need to hack around to maintain our overlapping bar chart! Unsure as to why this was closed.