Using mouse click to return image coordinates.

Ok so I've been trying to figure out how to do this and it seems very complicated for something that really seems straightforward.
Anyway. I have a camera that updates an image object on the front panel using a while loop. I have another image object that is updated with a still image when the "snap" button is pressed. Now what I want to do is to click on a point in the snapped image and have the VI return the coordinates of that pixel in the image coordinate frame.
What I've got so far is an event structure in the while loop with the following to occur in the event "image object -> mouse down":
Server reference (reference to the image object) -> Property node (last mouse position) -> output screen coordinates.
I've got two errors that don't make a whole lot of sense to me (I haven't worked with event structures before): "event data node contains unwired or bad terminal" and "event structure one or more event cases have no events defined". This second one seems strange since I don't actually want anything to happen if there's no mouse click. The first one seems to refer to the element box on the left hand side of the event structure.
The above is my lastest attmpt at sorting this problem and as far as I can see it should work. whatever about the errors, am I even taking the right approach with this? I'd have thought image cordinates would be a common enough thing but search the boards here, it would appear not...
Kinda stumped here. Any help is much appreciated.
Message Edited by RoBoTzRaWsUm on 04-14-2009 08:34 AM
Solved!
Go to Solution.

Hello RoBoTzRaWsUm,
I have taken a look at your VI, which has been taking a correct approach to the data you are looking for. As you are using and event structure, you should be looking for an event to occur. When using a Property Node, you are trying read an attribute of a control. However, in an Event Structure, I believe you should be using an Invoke Node. An Invoke Node allows your to read an event or write a method with the Control Class in LabVIEW.
1. Place down and Invoke Node from the Functions Palette in 'Programming'->'Application Control'
2. Wire your Image Control reference to it
3. Click Method, and select 'Get Last Event'
4. Right click on 'Which Events' and 'Create Constant'. Make the constant '1' in the array
5. Read the 'Coordinates' Cluster from the left hand side of the Event Case by right clicking and 'Create Indicator'
You will find a piece of example code attached.
Regards
George T.
Applications Engineering Specialist
National Instruments UK and Ireland
Attachments:
UKSupportMouseClick.vi ‏39 KB

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