How can I select a rectangular ROI with a fixed aspect ratio?

[mkdieric]

I use IMAQ ROI tools to select part of an image. But I need to select a rectangle with a fixed aspect ratio of 3:2. Does anyone know how to do this?
Thanks in advance,
Manu

[Michael Noll-Hussong]

Not by using the IMAQ WindTools directly. One idea is to draw a rectangled ROI first (using ), then modify it programmatically using the IMAQ ROI functions ...

HTH,
Michael