Hi Fabio,

This is most likely caused by the default line join - the following code shows how to change the line join of line segments:

line.BorderStyle.LineJoin = System.Drawing.Drawing2D.LineJoin.MiterClipped;

or

line.BorderStyle.LineJoin = System.Drawing.Drawing2D.LineJoin.Round;

Hope this helps - let us know if you have any questions.

Best Regards,
Nevron Support Team

Best Regards,
Nevron Support Team