Programatically focusing an XY graph

I am working on a GPS application where I am plotting positions found in an
XY graph. I've come sofar that I can see my trail and a dot of my current
position. I've been trying to readjust the xy graph such that my current
position stays in the middle and zooming is still possible. I've tried with
several property nodes, but didn't get it to work. help files also mention
that most properties cannot be changed at run-time (what other time, then?).
I am considering determining to only display points found within a certain
distance of the current point and have it auto-scale, but that would take
(unnecesary?) computing power. Any other suggestions?
Thanks!
Aart-Jan

thanks, dennis, I just figured it all out. I started with an outdated example from the NI library (XY Graph with Variable-Time X-axis) that got me started on a better understanding of the range property. Actually quite simple. Just select the x/yscale.range.maximum and .minimum properties. Get the current position values and sutract a constant value for minimum and add for maximum of the range. Great! Makes zooming also a breeze. Thanks anyways for following up
Aart-Jan

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Solved!
Go to Solution.

Actually, changing the focus alone did not trigger the event but I was able to then utilize the Empty Path/String function to drive a Value(Signaling) node for the control.
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i just figured out the answer to my own question... in the when new block instance trigger, there's an execute_query statement, and i simply put last_record statement after that...

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Attachments:
Vis_Graph.vi ‏45 KB

Best way to programatically re-size graphs?

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Blog for (mostly LabVIEW) programmers: Tips And Tricks

Hi,
Here's what I've used to do this;
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Regards,
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"CoastalMaineBird" wrote in message
news:[email protected]...
> I have a window that pops up, containing X-Y graphs, that are say, 600
> pixels wide.
>
> Under some circumstances, I want to reduce this to say, 400 pixels,
> and uncover a cluster of numeric displays occupying the other space.
>
> I would like to set the BOUNDS.WIDTH of the graph so that it extends
> right up to the POSITION.LEFT of the cluster.
>
> But I can't adjust the BOUNDS.WIDTH of the graph itself (that property
> is read-only).
>
> I can adjust the PLOT AREA.SIZE.WIDTH of the graph, which will affect
> the BOUNDS.WIDTH.
>
> But I can't use that for calculations, because I don't know the margin
> between the plot area and the graph bounds.
>
> I want it to work when the user re-sizes the window (All objects are
> scaled when window re-sizes). He may resize the window, close it,
> open it again and the size remains as he left it. That means I can't
> use absolute pixel values to move things around.
>
> I have thought of using decorations: a hidden rectangle that's the
> size of the small plot area, and another one that's the size of the
> large plot area. Then set the plot area's SIZE.WIDTH to the width of
> the small or large decoration. They decorations would scale along
> with everything else, and all would be OK.
>
>
> 1... Does anyone have a better / different idea?
>
> 2... If not, how should I get the reference to the decorations? They
> can't be named. Using the VI reference, I would have to pick out
> decorations #3 and #4 or something (there are other decorations
> already present). That just seems a bit fragile. How can I move
> these new ones to be #0, and #1 ??

Programatically focusing an XY graph

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