Lefi,
You can use the Draw Line.vi to create a series of lines corresponding to the crosshairs. The line style and thickness can be changed using the "pen" input the vi. I tetsed this out a bit and attached a screenshot of the front panel and block diagram. I got it pretty close but an extra line seems to be there and i'm not sure why. I'm sure you can figure that part out:)
The event case captures a user mouse move event for the picture indicator, the coordinates of the cursor are in the event node but need to be converted to be relative to the picture indicator, therefore the subtraction (this may be where I was off a bit). The new coords are input to the Move Pen.vi in order to set the current pen position to the mouse position. Thsi way the center of the crosshairs will be on the cursor.
Hope this works for you.
Dan
