Hello foxi,
maybe you could use the "cursor legend" of a XY-graph? This gives you as much cursors as you want. The user can move them and the program can check their positions (Property: Cursor List). This way you can calculate the distance between them...
Best regards,
GerdW
Per Mausklick in einem zuvor in einen Graphen geladene Grafik Abstände errechnen
Calculate distances by mouse clicking into graph with preloaded picture 
					
				
			
			
				
	Best regards,
GerdW

 
 using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019