XY graph - Cursor List

Hi,
i have a problem with the display of the cursor text. I am using the property node cursor-list to draw the lines including also the text of the cursor. Attached is a screenshot how I build this property. Unfortunately the text is invisible and I have to drag the label to the appropriate position. When I rerun the VI everything is fine and the label is drawn correctly. Now my question: Is there a special order how these properties have to be written?
Thanks for your response.
Best Regards,
Joachim
Attachments:
cursor.png ‏6 KB

Hi,
the justification of the x shell be most right - the y-position is well - but when I change the x position, it has no influence. When the cursor is align most right I have to use the minus-values to bring it more left. I have attached an example of the problem again.
Best Regards,
Joachim
Attachments:
cursor_test.vi ‏22 KB

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How to clear a cursor list without clearing the first row??

Hi all, good to see ya ...
I'm having this problem , that i'm using the first row ín a cursor list as a cursor in another graph. The rest of the rows are used as test sets i can add. So when finnish with the tests if some was set, i have to delete or clear the cursorlist(but only the tests and not the first wich is the pointcursor) byy using the graphs cursor list proberty node ' Crsr.List ' and initialising it as showed in picture 1.
Picture 2 shows the cursor list with some test and the cursor name (point cursor) and properties at top. These properties are directly copied to another graph cursor list also at the top and there the point cursor is used as the cursor. The tests are also copied to the other graph cursor list, but when deleting the tests by 'clear button' all data are cleared also the point cursor. That is my problem.
so the question is, how can i clear a cursor list without clearing the first raw and its proberties. any suggestions would be much help for me.
Regards
Zamzam
HFZ
Attachments:
Cursor Palette Front panel.JPG ‏25 KB
cursor paletteA.JPG ‏66 KB
Cursor paletteB.JPG ‏77 KB

Zamzam
The cursor list is just an array so you can delete the elements that you don't want.
David
Message Edited by David Crawford on 06-15-2006 12:46 PM
Attachments:
Delete Cursors.jpg ‏8 KB

A Cursor List Control for the HomeBoyz

I wanted a Cursor List Control for use with a Waveform Graph, but I couldn't find one anywhere in the Controls Palette. So during a busy morning of data gathering, I took about an hour to write one by hand. [Since I'm getting to be pretty good at LabVIEW, I reckon I can bill about $250/hr for this stuff, so y'all appreciate your free software.]
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Attachments:
Cursor_List.vi ‏40 KB

Dennis,
I followed your instructions..
It works..!!!

XY graph cursor legend in another VI

Hi,
I have a XY graph on my main VI. On the main VI there is little space for the cursor legend so I would like to move it into a separate frontpanel that can be popped up on demand. I managed to use the graphs reference to get all information about the cursors using the 'cursor list' property. However I would prefer to use the original cursor legend control since it already provides all the features I need. Is there a way to do this without copying all the graph data over to the second VI? I'm using LV8.21
thanks
klaus
Message Edited by KlausS on 06-13-2007 01:43 AM

I'm quite sure it's not possible to split a control over multiple front panels.
Another possibility would be to use the original cursor legend placing it in the least bad position and show/hide it by means of the Cursor Palette Visible property.
You wouldn't be allowed to move it, though.
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Cursor List Property - error 1077

Hello
I'm trying to programatically create cursors in the Waveform Graph. I want to have as many cursors as plots in the graph. See the attached VI. And now the weird thing: when I decrement number of plots, everything is OK - plots are shown, cursors are created. But when I increment them - I get "Error 1077 - Invalid property value." from the Cursor List Property Node.
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Attachments:
CursorList.vi ‏29 KB

Thanks to your reply, TiTou, I've came with another workaround - if you put wait (for example 10 ms) into the sequence struct on my VI's front panel, it works. And this lead me tothe best solution yet - update graph using Value property:
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Attachments:
cursors.png ‏39 KB

X-y graph cursor moving

I have an application that uses cursors to "zoom" onto user-selected portions of a waveform that can be acquired at different sample rates. Everything works fine except I cannot keep my cursors on the same portion of the graph when I change the sample rate. Everything else works fine. I've tried everything I can think of and what I've seen posted here: saving the cursor list before I change the sample rate then re-inserting it after the scope refreshes, saving the x locations in shift registers, functional globals, etc. This is extremely confusing. I save the cursor positions in an ini file and can program them into the cursor list with no problem when I start the application, but can't do it internally in the program! Why do the cursor x values change and how can I solve it?
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7.1.1/2000
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I think I got it .... but don't ask me how. I was setting the XScale.Offset/Mulitiplier/Maximum properties after I reset the cursors. If I reset the properties before I reset the cursors it seems to be working. I'm stumped for an explanation. The cursors don't care what the scaling factors are, do they? I thought x position 55.5 usec should be 55. 5 usec regardless of multiplier and array size.
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How to force waveform graph cursors to show Y value on more than one plot?

Hello
Is it possible to show more than one Y value on waveform graph cursors?
Thanks in advance.
Pawel

Hi Dennis
That is correct, on graph woth multiple plots I want to display multiple Y values of plots at the same X value.
I know I can use property node to access cursor list etc. and this is how I have done it, but my question was rather if it is possible to force the cursor legend to display more than one Y value (as a native display). As a default it displays one value and you can choose which plot you want to stick to, but it would be a great feature to have possibility to expand cursor legend to display more than one value.
The question has nice consequences. If it was possible, you could use a property node to export image of the graph, control sizes, or even simple "copy" data from the popup menu. Otherwise we need to "artificially" glue the exter
nal controls displaying Y values if we want to export pictures, etc.
But since you did not answer that I supose it is not possible, as I thought.
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How do I get an event-based response to a graph cursor change?

I want to respond to the user moving a cursor on a data (X-Y) graph. (LV 7.0)
What I really want is an event called "Graph.Cursor.Value Change", which would supply me with the new coordinates, but I see no such event.
If I use the MOUSE MOVE event to trigger obtaining the cursor values, it does not give me an event, until the cursor has stopped moving, the button is up, and the mouse moves off the cursor line.
Sure, I could use a TIMEOUT event, and read it every 100 mSec, but I don't like the time lag.
What I did was to set a flag TRUE on Graph.MouseDown and FALSE on Graph.MouseUp. I then choose an event timeout of 10 mSec or -1, depending on that flag.
That works, but is there a more direct way that I'm missing?
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Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

No, unfortunately there is not.
To code around this limitation, I typically use the timeout event in a more complex way as follows:
The timeout is wired to a shift register that is initialized with "-1" (no timeout). The value from the shift register then crosses the event structure and feeds to the shift register on the right in almost all event cases.
I add two special event cases:
(1) "graph-mouse down" puts a small number (e.g. 10ms) in the right timeout shift register
(2) "graph-mouse up" puts again a -1 in the right timeout shift register
(x) All other event cases (incl. timeout) wire the current timeout straight across to the right shift register.
The timeout event contains the logic to read the graph cursors and associated actions.
This way there is normally infinite timeout. Once the mouse goes down on the graph, the timeout executes at relatively rapid succession until the mouse is raised again. At which point everything quiets down.
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Graph Cursor Controls

On the graph cursor control (the 4 sectioned diamond that appears withthe cursor legend) I'm wondering what the top and bottom diamond do if anything. The left and right ones are simple enough (forward or back one sample) but the top and bottom ones don't seem to do anything from what I can tell. Are they just for decoration?
Solved!
Go to Solution.

Dan,
I never noticed that before but you're right, in a multi plot graph the up/down diamonds will attach the cursor to a different plot. I never noticed before because I usually change my cursor style so as to not show the horizontal line (just shows the vertical stripe for the cursor).

XY Graph cursor Error

Hello
This error was found, when I started using LabView 8, with my old LabView 6.1 VI's.
I have encountered a minor error on my Graph display. I noticed my Y-Scale numbers go negative, if I Press and Hold my Graph cursor, while I am moving it.
I run this same test using New LV 8 XY Graph and numbers do not go negative, but they surely flicker a lot + numbers still change some.
Have you noticed this before? Is there some new property I need to set up, to make my LabView 6.1 Graph stable? Is this known bug or am I just doing something wrong?
Here is VI for your testing. My LabView 8 version is 8.0.0.4005.
Just run it and while moving yellow cursor (press+hold+move), after 1-2 seconds of holding something happens.
Yours
Kari
Attachments:
Cursor Test.vi ‏84 KB

Hello Karik.
I experience the exact same problem in the application I'm programming.
The only solution I have come up with is having the cursors Y-axis
centered in the visible area of the graph.
However this is really bad because there is will create a smal "hole"
in the cursor bar, it looks awfull. I think this is a bug in lv8 since
in lv7.1 I could tie down the y-axis to like -10000 or something and
the problem would not appear.
Hope NI fixes this problem really really soon.
//Andreas

Xy graph cursor blinks

Hi All,
I have an xy graph and i cud find that the graph cursor always seems to blink....
I never had such a problem before...
Anybody knows solution for this
Thanks in advance

Hi,
I attached the screen shot and example VI for you.You can right click on the Curosr tool and select snap to cursor.MAy be you can send me the screen shot of your VI ,so can see what going on.
Regards.
Syed.
Attachments:
gengraph.llb ‏32 KB
XY.JPG ‏170 KB

XY graph cursor position bug

I have reproduced the bug mentioned here:
http://forums.lavag.org/Graph-Cursor-XY-Position-Bug-t1366.html&gopid=40859#entry40859
I've reproduced this bug (?) in Labview 8.5, with an XY graph doing
much the same as Jack. The attached zip file contains a stripped down
version of my program (originally written by my coworker, Andrew
MacDonald). Run "RENA3 Data Viewer.vi" and follow the instructions.
As Jack said, changing Cursor.PosX to Cursor.Index solves the problem.
I did not find this bug mentioned anywhere other than the above link.
Fraser
Attachments:
XY Graph Cursor Bug.zip ‏142 KB

Hi Karla,
Sorry if that wasn't as obvious as I thought! :-) Hopefully the attached image makes it clear. On the front panel, 'Cursor Channel' is inputted. This is directly wired to Histogram.Cursor.PosX. Immediately following, Histogram.Cursor.PosX is read and wired to the front panel indicator 'Cursor.Cursor Position:Cursor X'. There is always a difference of 15 or 16 between the two values. If there was no bug, these two values should be identical! I can only conclude that Labview is doing something funny...
As I mentioned before, changing Cursor.PosX to Cursor.Index fixes the problem.
A bit of background: my FWHM function outputs the peak channel, and the cursor is supposed to go through the peak so you can have a visual check that it is analyzing the right peak. I noticed that the line would never go through the peak; the line would always have an offset. After wasting a couple of hours, it became clear that I was wiring the correct value into 'Cursor.PosX', but something was going wrong beyond that.
Cheers,
Fraser
Message Edited by fjharris on 01-25-2008 11:34 AM
Message Edited by fjharris on 01-25-2008 11:36 AM
Attachments:
Labview Bug.png ‏27 KB

XY Graph Cursor Problem in Labview 7.1.1?

Hallo,
I am using Labview 7.1.1 and I am facing one problem with XY graph cursor. If I am moving cursor in one graph, I am expecting same movement in another Graph. But when I move cursor in Graph1, cursor in second graph moves but not to exact X value of Graph1.
Property of Cursor in both graphs must be "Lock to Plot"
If any body knows about this please let me know ASAP. I am attaching example VI for your reference.
Thanks,
Sashi
Attachments:
XY Graph Cursor Problem.vi ‏101 KB

It's a curious effect. Probably the floating point coordinate is sensitive to the exact pixel alignment (I mean that this would not happen if we had for example 1 pixel per point in the X direction).
Anyway, if you use Cursor Index instead (which is an integer) the behaviour is as expected.
Paolo
Paolo
LV 7.0, 7.1, 8.0.1, 2011

Mixed Signal Graph: Cursor Position Property for Multi-Plot Cursor

I'm working 6 waveforms on 3 different plot areas in a mixed signal graph in LV2009. When I try to pull the Cursor.PosY property from my cursor (in which Watch All Plots is True, and is set to Multi-Plot in the graph properties), it returns the value of only the first plot in the cluster of waveforms fed into the graph. I've tried changing the active plot, active plot area, nothing changes. I am able to retrieve each value via the cursor legend, but I cannot pull each of those values into another portion of my program. Also, I noticed that when setting events in an event structure, any events relating to a cursor drag aren't present as they are in a waveform graph. My workaround is to create an indicator for the Cursor.PosX property and monitor when that value changes, but I feel there should be an easier way. Any help is appreciated.
Thank you in advance!

Jeanius,
I am not quite sure why the cursor pos in the Wavegraph reference does not change when you change the active plot, but if you grab a reference to the specific cursor and then change the active plot things you receive the expected behavior.
Ben J.
National Instruments
Applications Engineer
Attachments:
MODDEDmixed graph cursor ex.vi ‏41 KB

Qucik Graph Cursor Legend Questions

Hi all,
I have a couple of quick questions regarding my graph cursor legend:
1. Is it possible to move the position of the cursor legend during runtime? I cannot seem to drag it around the graph?
2. Can I hide/remove the cursor mover? This is not needed and is for this vi as I need to be able to manually drag the cursors only.
I am accessing the cursor legend during runtime through a right-click and selecting "visable items:.
Thanks,
Jack

Hi please check Using Cursor Legend in this link if it is helpful
http://zone.ni.com/reference/en-XX/help/371361J-01/lvconcepts/customizing_graphs_and_charts/
Sorry i don't know exact answer for questions, But did you try property node of Cursor.
-To access it, right click the graph indicator in Black Diagram and go to create>>Property Node>>Cursor.
-Lot of options regarding cursor available there, you can make selected property to write or change the parameter. and check this for help on cursor properties
http://zone.ni.com/reference/en-XX/help/371361J-01/lvprop/cursor_p/
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

XY graph - Cursor List

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