Hi John,
Thanks for interest in Syncfusion products.
Currently, we don’t have support to get dragging location of Mouse in DiagramWebControl. This has been considered as Feature request. For this, Please create a DT incident for your query so that we can update the patch for this Feature.
You can create the DT incident from the following link.
<
http://www.syncfusion.com/account/dashboard>In the interests of maintaining confidentiality, we have a policy of not sharing patches or otherwise proprietary customer specific information in the public Forum.
Please let us know if you have any queries.
Regards,
Amsath Ali. M