Zooming out stepwise in graph

When zooming in a Labview graph control several times I would like to unzoom in the same steps I zoomed in, eg if I zoom-in in 3 steps I want to zoom out in 3 steps.The built-in unzoom only zooms out to maximum scale, so I guess this has to be done programatically. Has anybody tried this and can provide me with an example in LV 7.1?

Check out the attached. 'Begin time' and 'End time' are user controls; the user can zoom
with either the normal graph control or by manually entering times into the tstamp controls.
'Undo zoom' works back through the queue.
Hope this helps.
Matt
Attachments:
zoom-images.zip ‏35 KB
zoom_queue.vi ‏53 KB

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As an approxmation use the number of points plotted equal to the number of pixels in the width of the plot area (for a line plot). If you feed the graph more points than it has pixels to display them, the code internal to the graph has to manipulate that data to determine where to place each pixel. When you drop a new XY graph on the front panel it has 250x250 pixels. When I stretched one to fill my screen I had 1580x862. So X-axis arrays larger than a few hundred to about two thousand elements will result in some data manipulation by the graph.
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Zoom in or out of the graph while VI is running

Hi All,
Currently I have a popup subVI that contains multiple plots of collected data for the user to view. When the user clicks the "Stop" button on the subVI, this subVI will close. So I have the plotting section of the program in a while loop. I believe this is the reason why I was not able to use the graph palette to zoom in and zoom out right? Should I just leave he plotting section out of the while loop then?
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Go to Solution.

Place the property node inside a case structure and enable it when the iteration terminal is "1". (not zero!)
And please place a small wait inside your loop, there is no reason it should spin that fast. (Since the data never changes in your example, the entire graph terminal and inner loops belong outside the main while loop. However, I assume that your real application is different )
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Place the property node inside a case structure and enable it when the iteration terminal is "1". (not zero!)
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Read_CSV_Files.llb ‏546 KB
CSV_Test_data_1.csv ‏8 KB

Hello,
I am able to zoom in and out freely in the program that you have attached using LabVIEW 7.1. It sounds like you may have a corrupt instance of LabVIEW on your machine.
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Regards,
P.J.
National Instruments

Set scale values when zoom out

Hi!
I have a XY Graph and I want it to have three different scale ranges depending on a case structure. So, for example, if it's case 1, I have the xy graph X.minimum = 1,234 and xy graph X.maximum = 10,789 and so on.
I want to be able to zoom the graph but then when I zoom out to see all the points, I want it to have the same range I defined. I have the autoscale turned off and when I do the zoom out, it shows me different minumum and maximum values....
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Hello Zephirus,
When you ask a zoom out, write the scale value that you define, using a property node. To get it, right click on the XY graphe terminal, in the diagram, then select Create >> Property node >> X (or Y) Scale >> Range then All elements, or just the elements you need to coerce.
Let me know you progression,
Message Edité par Mathieu R. le 11-14-2006 02:52 PM
.mrLeft{float:left} .mrInfo{border-left:solid 1px #989898;font-size:x-small;color:#989898}
Mathieu R.
  CTD - Certified TestStand Developer / Développeur TestStand Certifié
  CLAD - Certified LabVIEW Associate Developer
Attachments:
PropScaleXY.JPG ‏7 KB

Moving cursor to Zoomed Position in waveform graph

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Solved!
Go to Solution.
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Failure Device.vi ‏89 KB

HI Mike
Thanks for the reply. When I apply the logic to reposition the cursor in the scale range event only one cursor is moving to the zoomed in position. The other cursor remains out of graph scale. I tried to repeat the same logc but it didn't work. Could you please tell me how to get the 2nd cursor also in to the scale range. Sorry i'm fairly new to labview. I have attached the pic of what I tried. Thankyou in advance
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Use the insert a Shape tool.
Yvan KOENIG (from FRANCE lundi 8 juin 2009 12:19:55)

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That looks like a Moiré pattern. Did you scan the image?
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Hi aefulcher,
It sounds like you had the external display set to mirror the internal display so the resolution(s) were changed to match each other.
OS X: How to use multiple displays with your Mac in Mountain Lion and earlier
http://support.apple.com/kb/ht5019
Check if the current resolution matches your screen's natiive resolution.
Thank you for visiting Apple Support Communities.
Nubz

Firefox box around zoomed out images issue w/ (xf86-video-intel)

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After doing some more research I have narrowed this down to being an issue with xf86-video-intel. The problem does not happen if I use the xf86-video-vesa driver. I have filed a bug report at https://bugzilla.mozilla.org/show_bug.cgi?id=468366
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Bug reported, anyone thing I need to add anything else?
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Using scroll wheel with modifier key to zoom out is not working

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The default key for scrolling zoom is not Command but Control. To change this, go to System Preferences —> Universal Access and click on the Seeing tab. In the Zoom pane, click on the Options button, and in the sheet that drops down, select the text box at the bottom, highlight the character there, then press the modifier key you prefer.
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Default FullZoom Level extension:
https://addons.mozilla.org/en-US/firefox/addon/6965

Zooming out stepwise in graph

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