Hello,
Spire.XLS isn't properly handling some charts when saving a worksheet to PDF.
The attached .NET Framework 4.8 project contains a sample Excel workbook with three charts: a line chart, a scatter chart, and a custom combo chart that combines one line series and one scatter series.
Running the project will display a form with two buttons. The first button saves the worksheet to PDF using Spire.XLS and the second button saves the worksheet to PDF using Excel interop.
The interop PDF correctly displays all three charts, while the Spire.XLS PDF only displays the line chart and the scatter chart. It appears Spire.XLS is not including custom combo charts.
Another minor issue is that the Spire.XLS PDF does not show the labels of the line chart's horizontal axis diagonally; instead they are vertical.
Thank you in advance for any help you can provide.