Intensity Map: Can I overlay a asterix or a symbol over a cloud of data points ?

[winterishere8]

All

I have an intensity map where I display the clouds based on a spectrum. I'd like to display an "asterix" or any kind of symbol on the middle of the cloud or anywere on the cloud based on some calculations that I do. I've seen people do it on LabWINDOWS, I am not very sure how to achieve this in Labview. Any suggestions/help ? Please see attachment. That must have the cloud, but without the symbol.

[jasonhill]

You could create a cursor on the intensity graph and set its position programatically with a Cursor.Position property node.

[winterishere8]

I forgot to mention one thing. The number of clouds is in the form of a 13 x 13 matrix. So I would require one symbol for every cloud. Is there an elegant way other than using 169 cursors ?

[jasonhill]

What?  You don't want 169 cursors?

I do know that LV8 added annotations and their properties are an array of clusters.  But I have not played with it enough to figure out an elegant way to do what you ask.  I feel like it should be possible, but am uncertain of the details.

[Ben]

"Any suggestions/help ? "

Suggestion only! No time to devlop example.

Invoke Node >>> Get image

Stick that in a picture control.

Insert as many symbols as you want.

Ben

[falkpl]

Another simple method is to overlay a transparent (background) array over the intensity map the size and dimensions of this grid can be programatically set: ie 13x13 where the width and height of each cell is uniform), make this an array of strings and when you write to a cell you will get the overlayed charachers such as *.  There is a performance hit when you overlay controls but PC are fast so unless you want to do this with video imagery it should not be a big problem.  The Picture control does provide your most elegant solution but can be a little tricky to calculate possition (width, height, top, right bottom, left, origin .... why so many conventions?).

Paul

[Ben]

"

The Picture control does provide your most elegant solution but can be a little tricky to calculate possition (width, height, top, right bottom, left, origin .... why so many conventions?).

"

I do not know if I would say it was elegant.

Flexible, Challenging, CPU intensive, Lacking UI functionality...

Yes!

Ben

[falkpl]

Here is a very quick overlay example.  It assumes a "*" as a marker and has no logic and uses a static grid size 10x10.  I hope monitor resolution scaling will not screw things up (I grouped the controls to minimize this.

Paul

[jasonhill]

Hey, don't knock cursors.  Cursors are pretty quick.  ~45ms on my machine (LV8, XP, P4, 3.79GHz).  Coding for them is not terribly complex, either.  See attached example. 

[winterishere8]

Jason

Your method is simple and cool. Sorry to have undermined it earlier. I've modified your code so it would work with mine. Thanks a lot.