Is it possible for Chart display two lines of limit ?

[acty]

Hi all ,

Is it possible for Chart display two lines of limit ?
Which is never changed by time .

Namely two lines come out immediately ,not gradually appear by loop.

For detail ,see attach file.

[mikeporter]

Well, you can write your code so it looks like that is what's happening...

The basic idea is to preload the plot with data containing just the limit line and then start passing in your datapoints. See the attached VI.

Mike...

[acty]

Thank you in advance !

but your vi can not meet this function that wave line start from 0.And yours start from 8.

This line of wave does not start from "0",.I want to it start from "0" to display wave .

For detail ,see attach files .

Thank you !

帖子被acty在05-07-2007 12:12 PM时编辑过了

[altenbach]

If the Y axis is always the same and does not autoscale, you could just overlay two horizontal lines from the decorations palette. 😮

[acty]

"If the Y axis is always the same and does not autoscale, you could just overlay two horizontal lines from the decorations palette."

But it does not auto to set the range of  two lines of limit  .

For example , sometimes ,set its range is from 10~15

                         or set 32~45 .

I want to it can auto set by program.

Thanks .

[LabViewGuruWannabe]

Howdy,

If you use a Waveform Graph, you can use cusors to do exactly what you want. For example, you can use one cusor for an upper limit, and another cursor for a lower limit. You can set these limits programatically, in case they change during the program run, and they are not affected by the data shown. You can also choose to show or hide the cursor list. Very convienient.

See pics for an example.

B-)

[acty]

Thank you for your help !

but I want  the display of data  to gradually come out on panel.

And Waveform Graph is display by get  array data.

It can't display point data gradually .Namely it can't display for real time .

Thanks .

帖子被acty在05-07-2007 07:51 PM时编辑过了

[LabViewGuruWannabe]

I have no idea what your program is supposed to do, but you can certainly have the waveform graph update continuously. You just have to play around with the array functions.

Where is your data coming from?

[mikeporter]

Here, try this one...

Mike...

[acty]

Thank you for your help !

But I still have a problem and need your help once again .

That is how to do and get the following function .

Automatically display value when cursor of mouse approach point of data "

For detail ,see attach file.

Thank you !

帖子被acty在05-07-2007 10:18 PM时编辑过了