reading coordinates of jpeg of map

[Raybeee1]

I going to load a jpeg of a map an I need labview to report the coordinates when I click on a position of the map, anybody have any Ideas

thanks

[LV_Pro]

If you are using a version of LabVIEW with events you can create an event structure that responds to the "mouse up" event and returns the coordinates. You will have to do some housekeeping to keep track of where your image is displayed and how that relates to the mouse coordinates.


Putnam Monroe
Certified LabVIEW Developer
North Shore Technology, Inc.

[npoling]

If you create a property node for the picture, there is a 'mouse' property which is a cluster. That cluster contains the position cordinates.

[chilly_charly]

Nice to have somebody interested in maps.
There are three property nodes that will be usefull here :
the mouse position x, y, the origin Ox, Oy and the zoom factor Z.
The coordinates X, Y on the map, relative to the upper left corner, can be calculated using the equation :
X = Z*(x + Ox) and Y = Z*(y + Oy).
Then you'll have to determine the correspondance between X, Y and the actual geographical coordinates of the map position.
I did something like that, but the application is not yet finished.

CC

[LV_Pro]

here is another "kluged" example of one possible way. It isn't the cleanest, neatest vi I've ever made (not the worst either!)


Putnam Monroe

[Raybeee1]

sorry LV_Pro, I have 7.0, not 7.1

[LV_Pro]

here it is saved as 7.0

Putnam Monroe

[LV_Pro]

I didn't notice until I had sent it, but it is quite a bit larger in 7.0 than in 7.1, hmmm?!


PM

[Marce]

Hello,

And talking about maps, I'm looking for a function where the first click on an image creates a dynamic arrow that follows the cursor to anywhere it goes on the map. The second click pans the image using the distance and direction defined by the two clicks. Any ideas?

CC: I am interested in maps too but I've been so busy with other programs lately that I even forgot to answer your email of a few months ago.

Thanks,

Marce

[chilly_charly]

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Marce wrote:...CC: I am interested in maps too but I've been so busy with other programs lately that I even forgot to answer your email of a few months ago.

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At least, you are still alive ! 😄 I didn't solve my orthorectification problem, but now I'm less in a hurry ! May be we could reactivate this old thread ?

CC