Unfortunately you don't give enough information.
Which barchart are you speaking of?
If you speaking of the
xChart class then:
The BarChart doesn't have any line thickness!
If you want to create a LineChart you need:
- to select the LINE chart type.
- add the lines with AddLine2 where you can set the StrokeWidth, the line thickness.
- add the points with either AddLinePointData or AddLineMultiplePoints.
You should look at the CreateLineChart2Data routine in the xChartDemo program.