Dear danilo,
You can find the official reference help file for IMAQ Visual Basic programming with the documentation of all the functions and properties you need to create your application.
If you have the NI Vision installed, you can find this here: C:\Program Files (x86)\National Instruments\Vision\Documentation\cwimaq.chm
I think if you would use the properties of OriginX and OriginY, it can give you the position of the left upper corner of your displayed image inside your attached large, zoomed image.
If it's better, you could use the CenterX,Y properties as well.
You can also access the ZoomScale property which gives you the multiplier between the displayed/zoomed image and the original one this way: original pixel size = zoomed pixel size * 2^x where x is the ZoomScale.
For example ZoomScale is 0, the original image is the same size as the displayed. If it is +1: zoomed picture is magnified by 2. 1 displayed pixel represents 2 original pixels.
With the above mentioned properties you can easily calculate the zoomed area of your image: (using pseudocode)
int WidthInOriginalmage=ControlImage.Width*(2^ZoomScale)
int HeightInOriginalmage=ControlImage.Height*(2^ZoomScale)
UpperLeftPositionX=OriginX; UpperKeftPositiony=OriginY
UpperRightPositionX=OriginX+WidthInOriginalmage; UpperRightPositionY=OriginY
BottomLeftPositionX=OriginX; BottomLeftPositionY=OriginY+HeightInOriginalmage
BottomRightPositionX=OriginX+WidthInOriginalmage; BottomRightPositionY=OriginY+HeightInOriginalmage
Best Regards,
Tamas Szekely
Applications Engineer
