Hi Thomas Brand,
We have reviewed your query and would like to offer the following suggestions:
Suggestion 1: You can obtain the chart points using PointToValue and ValueToPoint methods based on the provided axis coordinates.
For more details, please refer to the following document: Transform axis value to pixel value in WPF Chart Control | Syncfusion.
Suggestion 2: If your case to draw a dotted line at the center of a candlestick, we suggest using annotations. You can set the line annotation using axis coordinates.
For more information, please visit the following document: Annotations in WPF Charts control | Syncfusion
If you need any further assistance, feel free to ask. Thank you for your understanding.
Regards,
Arul Jenith B.