Dragging an arrow within a circle and record the mouse coordinates

[An Tran]

Hi,
I have a circle (a wheel) with an arrow inside and I want the subject to 
indicate their response by either (1) dragging the arrow on the wheel or 
(2) click on the wheel with possible adjustments

Some of my ideas:
1. rotate the whole image containing the circle and the arrow to the new 
position after the mouse click based on the angle between the "old" arrow 
and the new arrow
2. draw an arrow (or maybe only a line is enough) and pivot it with the 
mouse
in both situations, the mouse coordinates should be logged and I want to 
calculate the degree of angle 

I don't have any programming background. I know that Eprime is based on VB 
so I found some ways to solve the problem with VB, but I don't know to what 
extent Eprime and VB are similar. 

Can someone give me advice how to solve this?

Thank you very much!


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