This plugin has been deprecated. Since Highcharts v11, rounded corners are built into the library natively, and with better handling of chart direction, stacking and more. See column.borderRadius.
This plugin adds options for setting rounded corners on bar and column charts.
The contents of the plugin is located in the javascript file
rounded-corners.js.
This plugin is published under the MIT license, and the license document is included in the repository.
The plugin adds four options to the column series object; borderRadiusTopLeft,
borderRadiusTopRight, borderRadiusBottomLeft and borderRadiusBottomRight.
If the options are given as numbers, they are interpreted as pixels. If given
as percentage strings, they are percentages of the column width.