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I mean distance / space between two bars in the same bar chart

How can we control distance between category bars in the bar chart, when we don't have series category combination.
I have only two bars on the chart and want to reduce distance between them.

As there is BarRenderer for bar chart, is there any renderer support for Pie chart?

yup, something like this, but is it possible to to make a generic class with has a list of colors, as i need to 20-25 different colors

is there any way to implement array or list of n colors for sections?

how can we customize section color in pie chart?