Hi jungjin,
Regarding current position in NodeDrop Event, NodeDrop event will be fired before offset values are set to the Node, so the dropped node OffsetX and OffsetY value will be 0. However, Current position of the node dropped can be determined using DiagramPage’s Drop event, please refer the sample from the following link.
Sample Link:
https://s3.amazonaws.com/files2.syncfusion.com/Support/Diagram%20WPF%20&%20SL/Sample/F97300/NodeDropPosition.zipIn this sample, when a Node is dropped from SymbolPalette, a MessageBox will show the current position of Node dropped.
Please let us know if you have any queries.
Regards,
Sundar M