in a recent project, it was required to only draw perfect circle ROI's, It is possible using the Ellipse tool, while holding down the shift key during the ellipse draw.
As the application is touchscreen, the shift key hold is not an option. This can be accomplished using the 'Keyboard User32' vis that can be downloaded from NI. Even though originally written for LV5 and Win98, Win7 32\64 support this User 32 call.
Regards
Jack Hamilton
