Chart plot in the form of decimal numbers

Hello all,
I am facing a severe problem regarding the plot using charts.I am, plotting some data on charts(charts only,plot style will be like impulses) and whatever the data on the charts the corresponding amplitude should be pasted as text on the below picture indicator exactly at the corresponding position.Can anybody give me an idea please?
Thanks and regards,
srikrishnaNF
Attachments:
finaltest_FP.png ‏4 KB

Hi smercurio_fc,
I wonder whether the charts are also having cursors in your labview version.Which version of labview you are using?I am unable to put text on chart and you are talking about the cursors on chart which are not in my labview version 8.5.Thats why i am using labview picture indicator atleast i could display the value as text on it.Please tell me if you got some other idea.
Thanks and regards,
srikrishnaNF

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"Nina" a ecrit dans le message news:
[email protected]..
> I would like to read a text file in which the decimal numbers are
> using dots instead of commas. Is there a way of converting this in
> labVIEW, or how can I get the program to enterpret the figures in the
> correct way?
>
> The program doest enterpret my figures from the text file in the
> correct way since the numbers contain dots instea
d of commas. Is there
> a way to fix this in labVIEW, or do I have to change the files before
> reading them in the program? Thanks beforehend!

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Hello all.
Just read my signature first, it might explain a lot. I do not intend to compete with Darren and I don't think this "nugget" (at least it supposed to be one) will amaze any of the LV veterans and this forum is rich of them. But maybe it will bring some new ideas to some of you or maybe it will be useful for some LV beginners (like me). It is very likely, my code will have some lapses, but please be gentle pointing that out to me. If you feel a need, you can always optimize the code and develope it further. Just don't forget to share!
So back to the point.
I am developing a project using LV. In my program there is a waveform chart which has to show 4 plots. Depending on the length of the X Scale, it sometimes gets hard to see the plots clearly because of their density.So I decided that I need a tool, which would zoom the chart in. And this is what I have came up with after a few "Google" searches to check which part of the bike is already invented and also a bit of programming by myself.
Maybe you guys (at least the veterans) know the BetterVIEW Consulting LV example where they have implemented the Mouse Over effect. So a part of their example has been used in this tool and part of the credit must go to them. I thank them a lot
This tool uses a cluster and its property of visibility to show/hide the cluster depending on if the current position of the mouse cursor is in the desired range or not. The program also gets the image of the chart and returns the subset of the image. The subset is taken for the area arounf the mouse cursor. So if you move the mouse, the zoomed in area will also chage in response. After that, the subset of the image is zoomed in for better view.
The user might chage the zoom factor during the execution. Also it is possible to turn the zoom option On or Off if you don't wish to see it for the moment.
This is how the front panel looks like:
And this is the image of the block diagram (see the attached files for the vi, the VI Snippet tool distorts the code too much, so I haven't added it):
I haven't found anything the same in the forum. Yet I'm a newbie here and I don't have that much experience surfing it. If it wouldn't be something new (in the forum, not necessarily to some of you personally), just ignore the thread. I hope this was worth your time and your attention.
Good coding
Message Edited by Giedrius.S on 02-11-2010 12:46 PM
While evaluating my code please have in mind that I am a LV novice. Therefore sometimes my code might violate some coding rules that I have to learn about myself. But how else could I do that...
Chart zoom with "Mouse Over" effect
Attachments:
Zoom.vi ‏198 KB
Mouse_pos.vi ‏20 KB
Check_pos.vi ‏18 KB

Very nice Giedrius.
It takes guts to "step up to the chalk board" so I will do what i can to give you some ideas to think about. This is similar to the type of feedback I offer durring our in-house code reviews.
1) The floating property nodes outside the loop are not sequenced by wires so they could execute after the loop starts. Sometimes this could cause weird errors. Seq with the error cluster.
2) Property nodes can be re-sized so you can apply more than one property setting in the same call. Property node have to execute in the UI thread (which is single threaded) so using a single nodes will force a single context switch rather than one for each.
3) Setting the same property repeatedly in a loop just burns CPU. THe Scale min for both X an Y can be moved outside the loop ?
4) THe Wait Until Next ms" function does not get used in any of my code. It is not a way to get a fixed wait but rather a random wait. If you code completes 1 ms after the next multiple, the delay is double less 1 ms. If you have multiple loops using them and it f the delay for each are not unique prime numbers, then the "Wait until next ms multiple" is a good (cough cough) way of getting them all to wake up at the same time and fight for the CPU.
5)An Event Struture to monitor mouse enter/leave and mouse move (this would have to be a sepearte loop) is easier on the CPU than polling.
6) Is that math in the case to handle the Chart position on the FP? If so then using the property nodes for the chart to find its postion will let you code adapt to GUI changes.
7) Right to left wires are not well recieved.
8) A Bundle by Name is prefered over a "Bundle" since it is self documenting. I know the Picture function so I can see that is the rectangle you are specifying but reader not famliar with that function would not be able to "READ" the code without poking at it.
9) THe event structure would also help with setting the Zoom factor. Only poke it when you have to.
That is all that comes to mind at the moment.
Again thank you!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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Chart plot in the form of decimal numbers

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