Waveform graph x scrollbar in LV7.0?

LV7.0. Why does the Waveform Graph have a Show Scrollbar property if the scrollbar is not active?
Thanks.

No, it's the correct way
Are you zooming in on the x axis like this? You also need to have data on the plot in order for the control to be active...
CTA, CLA, MTFBWY
Attachments:
Untitled 4 Front Panel _2012-06-20_17-40-14.png ‏16 KB
Untitled 4 Front Panel _2012-06-20_17-40-32.png ‏14 KB

Similar Messages

How do I change the width of the x-scrollbar for a waveform graph?

I have a LV7.1 application that contains a waveform graph and must be usable on several PC with widely varying screen resolutions. I have decided to position and scale the front panel objects programatically, including the graph itself. The appearance of the graph is satisfactory on all screens, except for the x-scrollbar. The width of the x-scrollbar does not change when I change the size of the graph. I cannot figure out how to change the width of the scrollbar programatically to match the adjusted size of the graph. Any suggestions?
Regards,
Chris

Chris,
I don't think that you can change the width of the x axis scroll bar programatically. One thing you could do though is create your own scrollbar and change it's properties as your program runs. I wrote a quick example of how you could do this and I've attached it to this thread.
I hope this helps,
Justin D.
Applications Engineer
National Instruments
Attachments:
ChangeXScrollbar.vi ‏116 KB

Has anyone "zoomed in" on a portion of a waveform graph?

Has anyone ever used two cursors to zoom in on a portion of a waveform graph?
I've seen that newer Oscilloscopes offer features to do this both horizontally and vertically.
See the attached jpg for an example of what I'm trying to do. It is from Google Finance. Notice the area circled in red. The two cursors define the portion of the waveform to be displayed on the main graph. There is also a scrollbar beneath them which allows the user to quickly move the zoomed-in area across the graph- I would love to have that functionality on the LabVIEW graphs.
My first thought is that I can do this using mostly property nodes. Not sure on vertical zooming scrolling the horizontal zoom- I'm thinking maybe this would best be done using scrollbars which are not part of the graph itself.
Any ideas or comments?
Thanks,
Dave
Attachments:
deleteme.jpg ‏38 KB

Cursor position is available in Labview via a property node. You can also set about every chart property with property nodes. I have used this many times. Here is a trick. If you have two cursors, Make separate arrays of the x and y positions. Then use the "Array max&min" to sort them. This will make your program independent of the cursor sequence.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Can a waveform graph's display parameters be changed in an exe from outside that exe?

Hi all,
I have a kind of strange Q to post here:
I've got a quite stable test execution system still based on LV 7.11. Amoung others it has a waveform graph that shows curves for different test measurements. All be done in the exe, mostly via Refnums of that graph and property nodes in subVIs that (re-)configure the graph to show the respective signals, descriptions, scales etc. Worked fine for many months, if not years.
This morning I got a call from production floor that they got strange displays. Turned out that some of the properties of that graph became misconfigured, Example: X-sxale is now at autoscaling and the x-scrollbar is invisible. So I got a black bar when displaying ~350 s of ECG data instead of ~5 s. This never happened before and happened similar on at least two (independent) machines. They only share a mySQL-database, some shared folders on the LAN to store results, a LAN-based printer and a common source for an ini-file for test configuration.
They also had problems printing the test reports this morning.
Is there any configuration outside of my exe (for LV runtime?) that could have coused this?
Greetings from Germany!
Uwe

Coq Rouge wrote:
Have the computers been updated with some new software? Like windows service packs, new virus scanner etc
Hi Uwe,
I have to side with Coq Rouge on this Q.
It is possible to "reach-out and touch" if VI server is enabled on those machines but the possibility of malcious code finding the invokations required to pull that off.... unless you have a competitor that has you in their gun sights .... are remote.
There have been a couple of posting here where people have noticed odd things happening with window focus etc. In my case it seems like Windows is clcikcing my mouse for me. I have only seen this on teh Windows XP machine that I allow to get updates.
I believe the system logs should record signs of updates etc. The machines affected should be chcked.
I admit the above is of little use, but maybe it can inspire you.
Trying to help,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How can I get the cursor value from a waveform graph

Is there a way to get the value of cursor position on the waveform graph so mathematical calculations be performed on those values. We can see the value in cursor legend, but can we extract those values for future calculations in the block diagram somehow.

Right-click on the waveform graph icon. Select Create>Property Node>Cursor>Cursor Position. That spits out a a xy cluster for the current cursor position.
If you have more than one cursor, you can either set up a loop and set the Active Cursor property node (right click the property node and select "Change to Write") or you can pull everything you ever wanted to know about every cursor with the Cursor List property node.

How to get the data from a waveform graph?

Hellow!
I have a waveform graph which has the experiment signal, so how can i do to save the X,Y data in a file?
thanks!
Mike

Hii,
You can store the data as shown in the vi, just use the signal data by converting it into the numeric form and give it instead of random data.
Hope this will help.
Thanks,
Nishant
Message Edited by Nishant on 04-16-2006 11:21 PM
Attachments:
file write.vi ‏31 KB

Data acquisition and waveform graph plot

Dear All
My signal is out put of current transformer which is 2v dc. I succesfully configure usb 1208fs with labview8.2. Now I want to plot my input signal on the waveform graph in frequency vs amplitude(db). Can any one guide me how can i plot my data?

Hi,
Could you strip the VISA stuff and re-post your VI so I could run it and see where is the difference coming from. A few observations though
1. Always try to wire from left to right and top to bottom so that your block diagram code is readable.
2. A waveform graph gets completely redrawn everytime you give it soem data ao it is typically used outside any loops. If you want to display a waveform inside a loop, it is better to use waveform chart.
Regards,
Ankita

Using a waveform graph, how to get all recorded data graphed?

I record data from 6 channels using DAQmx with simulated channels and write to measurement file. Then using read from measurement file, and waveform graph, I am trying to graph the data that has been recorded. I am only getting a small amount graphed. The same graph appears whether I have let the measure and record program run for 1 minute or for ten minutes. It also displays a time at the end of the graph that is in the future. What am I doing wrong? Please help.
Hillis Pratt, Jr.

I am attaching the two VIs I have been trying to use. I started with examples from NI and didn't go far from that. Any assistance would be appreciated.
Attachments:
Measure and Record Six Voltages with Express1.vi ‏119 KB
Graph Measurement Files1.vi ‏89 KB

How do I Get the value from a mouse click - on a waveform graph?

If I have made a plot into a Waveform Graph and later want to do a zoom of my data
(Not zoom into the Waveform Graph, but regenerate the data). How do I read the mouse
coordinate if I click on the graph window. I know how to put up the horiz and vert
cursors but don't know how to just read the mouse click. I would really like to
follow the windows standard that identifys a rectangle by clicking and draging and then
be able to read the corners of the rectangle. Thanks, Rick
PS: Using Labview 6i

I would recommend to 'translate' your graph in a picture and dislay it in a picture control (see picture examples in LV6).
Once you did it, pictures have an extremely useful property called Mouse that returns the mouse coordinates and click events when you place the cursor on the picture.
By this you can re-arrange the graph on picture appearance.
There are also other methods such as using a Window's API that returns the mouse position referred to the whole screen window, but I believe this would be much more difficult to implement.
Let me know if this was clear and if you need an example vi.
Good luck,
Alberto

Get a waveform graph to stop plotting after a given time period

I am doing a research project looking at the effects of modifying visual feedback on a person's current force output. I have a waveform graph that plots the target force level they are trying to match (specified by me) and next to it a second plot showing their current force output (in real time). I am trying to make a condition where the current force output plot (or really the whole waveform graph) stops plotting after a 10 s time period, but can't seem to get it to work. It either plots for the whole trial, or does not plot at all. Is there a way to put a timer on a waveform graph in order to tell it to stop plotting after a specified time period?
Thanks!

Hi again,
I have tried to open the .vi you sent, but I have version 8.2 (yours is in version 8.5) and cannot open it. Is there a way for you to tave the.vi so that it can be opened with earlier versions of the program?
I have attatched my .vi to this message as well.
Attachments:
bimanual combined with metronome_conds.vi ‏174 KB

How to change the waveform-type inside of the waveform graph from int to double?

Hello,
attached you find a vi with two waveform-graphs.
When i rightclick them and select "create constant" then it creates the constant.
The difference between the two graphs is, that one creates a double-array inside the constant and the other graph creates an int-array inside
The question is: Where can i change inside of the int-graph that it also creates a double-array in the constant?
(Problem is that all double-waveforms send into this graph are changed to int and rounded in the display)
Thanks for the help
Attachments:
waveform.vi ‏27 KB

The datatype of a chart or graph is determined by the last thing you wired to it. By default, they are simple doubles or arrays of doubles. My guess is that you first wired a waveform with an integer data type to the graph. It should switch automatically to a double waveform graph if you wire a waveform which contains double data to it. If it does not, that is probably a bug. If you have a VI in this state, please post it and I will report it to R&D.
Thanks!
This account is no longer active. Contact ShadesOfGray for current posts and information.

I would like to see the time in a waveform graph (real-time)

i need the x-axis of the waveform graph to show real time (from the computer clock). I have made a program with all the example. He read and log data when the chosen time has elapsed. the program work's well...but i dont't know why the x-axis blink every time he draw a point
i can see two x-axis in the same time.
i give you a picture of one of a part of my program, i hope someone can help me
Attachments:
my_software.JPG ‏128 KB

Hi,
I tried to reproduce what you were getting by building a simple VI but I havent had much luck (I have attached the VI).
Could you post your code so that I can take a look at it?
Feroz P
National Instruments
Attachments:
Graph.vi ‏39 KB

Transition measurement vi cursors displayed in waveform graph are moving outside of scale

Using a waveform graph to display pressure over time. I wanted to be able to calculate the fall time of the pressure over time so I'm using the Transition Measurement vi. I copied exactly what was in the example for transition measurement inside help and it is correctly determining the falling transition time but I am having a problem with the cursors on the waveform graph. I should be seeing a set of green vertical cursors marking out the fall start time and fall end time like in the picture I've attached (capture2) like in the example. The problem is they both always start at 3.43 (capture1) and after each sample period they increment by one (4.34, 5.34, 6.34) The come right out of the bundle from the transition measurement output as those numbers. The period of the signal I'm interested in is always less than 2 seconds, so I never see the vertical cursors.
I've tried substituting my daq signal with a sine wave generator and it does the same thing.
The block diagram is in the first capture
also I would be interested in finding out exactly how the numbers wired to the active cursor property of the property node for a waveform graph relate back to the actual cursors on the graph. Are they just automatically numbered starting with 0 from the top-down?
Wayland
Solved!
Go to Solution.
Attachments:
Capture.PNG ‏44 KB
Capture1.PNG ‏7 KB
Capture2.PNG ‏29 KB

Hi Wayland,
The reason the cursors are always apparent in the example VI for the Transition Measurement.vi, is because the signal being generated is always resetting. So, the signal resets to a 'new' signal for the cursors to go over and therefore always remain in the somewhat same location. The Waveform Graph is also configured in such a way that it will not move or continue to show new data coming in, the data cursors have moved onto. So in your case, you will want to right click the graph and make sure "Ignore Time Stamp" is not checked/selected. This will make it so the graph keeps up with your incoming data and the cursors. You can check this in the example file by removing the True Constant going to the waveform generator and changing the time stamp option previously mentioned.
In order to view the available cursors and their numbered position, you can right click on the Waveform Graph and select properties. In the properties window there is a Cursors tab, inside this tab at the top is a drop down menu that lists all of available cursors, indexed starting with 0 at the top.
-Jake B.

How do I change the data used by a Waveform graph dependent upon which tab window is active?

Hi,
First I want to say thank you in advanced!! Let me describe the situation a little bit. My front panel VI (see attachment) has a tab control and on each tab window I have an intensity chart with a free-drag cursor. Below the tab control window I am trying to display either the row or the column of data where the cursor is located, I can do this for each intensity chart individually. I am trying to clean the block diagram up a little bit and instead of using 4 Waveform Graphs, I want to use only one, can the data that is displayed in the wave form graph is associated with which page is active on the Tab Control. Can this be done? And how can I do it?
Thank you again,
~Daniel DeWitte
Solved!
Go to Solution.
Attachments:
Changing Waveform graph data.JPG ‏123 KB

Simply wire the tab terminal to a case structure that switches the data going to the graph terminal
(sorry,posting by phone, cannot look at your code...)
LabVIEW Champion . Do more with less code and in less time .

Memory leak in Waveform Graph?

Either thier is a huge memory leak in the waveform graph or I am really doing something wrong.
I created an example app with a waveform graph and a button the contructor looks as follows:
Form1(void)
InitializeComponent();
vals = gcnew array<double>(60000) ;
for (int i=0; i<60000; i++)
vals[i]=Math:in(Math:: PI*2*60/6000.0*i) ;
and the click event looks like this:
System::Void button1_Click(System:: Object^ sender, System::EventArgs^ e)
this->waveformGraph1->Plots->Clear() ;
NationalInstruments::UI::WaveformPlot^ plot = gcnew NationalInstruments::UI::WaveformPlot(xAxis1, yAxis1) ;
plot->PlotY(vals) ;
plot->LineColor = Color::Red ;
this->waveformGraph1->Plots->Add(plot) ;
every time I click the button the memory used on my system goes up by about 10 MB. I tried this also with using this->waveformGraph1->PlotY(vals) and the memory usage stays solid as a rock.
Am I doing something wrong or what is causing the leak so I can work around it, my program plots 4 arrays of this size on one graph per test result.

The plot uses some unmanaged resources (gdi objects and other handles), which is why it implements IDisposible. Because of the GC, resource cleanup is not deterministic, clean up occurs when the GC deems it necessary. Calling delete (which based on C++/CLI syntax) ultimately ends up calling Dispose and this forces the object to release any handles it might have immedietly. See the documentation for the .NET Dispose pattern for more information.
If you don't call delete, what would end up happening is that eventually at some point in the application, the GC would fire and cleanup all the objects and handles and you would see a drop in the applications memory footprint, but you would need to run the application for a while before that might happen. In a long application run, things would end up stabilizing.
Bilal Durrani
NI

Waveform graph x scrollbar in LV7.0?

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