How to set GapWidth when plotting Col chart using function "AddChart"?

[ffh-zhang]

Description

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Output of go version:

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Excelize version or commit ID:

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Environment details (OS, Microsoft Excel™ version, physical, etc.):

[xuri]

Thanks for your issue. I added new fields GapWidth and Overlap in the Chart data type to support set gap width and overlap of the bar and column chart, please upgrade to the master branch code by go get -u github.com/xuri/excelize/v2@master. This feature will be released in the next version. Now you can set the gap width of the column chart like this:

gapWidth := uint(10)
&excelize.Chart{
    Type: excelize.Col,
+   GapWidth: &gapWidth,
    ...
}