Zooming in on a graph

Hello,
Does BI Publisher allow for graphs to be zoomed in to a fixed amount along the Y-Axis? For Instance, If Graph A's Y-axis goes from 0 to 100, would I be able to make the graph's appearance show from 80 to 100 so the line graph is more readable? My theory is that a statement needs to be put in the XSL code. Can someone give me an example or a way to solve this problem?

To use this, you should add this line into the XML of the graph, to do this double click the graph image and go to the Web tab, then add this line in after the line starting <Graph

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How to record and plot only the zoomed portion of a Graph or Chart?

I'm using LabVIEW 8.6 and have problem plotting only zoomed part of a graph or chart onto other. Please help.

Sorry, your VI makes absolutely no sense. First you slowly generate chart data, then you write it to a file, read it back from a file, do some exceedingly elaborate while loop that could be done with almost no code at all, then chart all data at once again. The stop button in the while loop makes no sense, because the while loop executes so fast that it is not possible to actually stop it while it is running, only if the button has already been pressed during the first FOR loop.
What is the purpose of the two arrays? They don't seem to serve any purpose. Why are you getting the array size with every iteration of the loop? Once, right before the loop should be enough. Index array is resizable, so only one instance is enough. Instead, array to cluster is probably all you need.
The sequence structure is only needed because you write, and then immediately read from the file. All you probably need is to write to the file and wire the 2D array to the seconds structure. Now we have a data dependency and the sequence structure is no longer needed.
Can you tell us a little more how you are zooming. Do you want to zoom any of the two graphs and automatically zoom the other accordingly?
As it currently stands, only the first chart gets data, so zooming the other one seems useless. Once the second chart has data, the VI stops and you can't do much either programmatically. Please explain how you are zooming.
LabVIEW Champion . Do more with less code and in less time .

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

Adding zoom facility in bar graph

Hello,
I want to add zoom in my bar graph so that i can "zoom in" and "zoom out" my graph. This zoom facility is provided in "Jfreecharts". I want to use it in Oracle graphs. I have seen attributes of "zoomFactor" and "zoomDirection" in Graph.dtd but i don't able to use them in graph.xml.
can anybody help me in this matter.
Thanks in advance
Waseem

Use the insert a Shape tool.
Yvan KOENIG (from FRANCE lundi 8 juin 2009 12:19:55)

Moving cursor to Zoomed Position in waveform graph

Hello
I have 2 cursors in my waveform graph and I would like to have the cursors move to the zoomed in position of the graph when I zoom in or out of the graph. Could some please tell me how to do it. Thankyou in advance
Regards
Pratheek
Solved!
Go to Solution.
Attachments:
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
Regards
Pratheek
Attachments:
Capture.PNG ‏18 KB

"Zoom" functionnality on a graph ?

Hi All,
I have a simple report with a chart and our users have the possibility to see this report on two differents screens (small and big).
No automatic zoom (like powerpoint or SVG) is possible actually ...
so I create 2 reports, one with a small graph and small fonts, small labels ... and the second with a bigger graph with bigger fonts...
Do you think it is possible to have this zoom functionality within the same report ? and to adapt my graph size to the screen used for the display ...
Soufyen.
Message was edited by: soufyen ben

Ashwin,
no it is not working automatically without clicking on a button.
I think my pb is more a javascript pb ... I have to calculate the "virtual" screen size to switch ffom a report to another.
The concept is that we have 6 screens, 5 screen (about 100cm) are divided in four and the last one is full display.
So, in every part of the divided screens we display a report then with the cockpit tool we choose one report to be display on the full screen and in this case we have to make the report bigger.
I heard that there is an SAP tool for this called "Cockpit management" in SEM (transaction UMC_CPM_STRAT) and maybe this tool can manage the zoom function but I do not found any documentation.
soufyen.

Questions about decimation and zoom in graphs

I am currently developing an application in which the size of the signals I have to display in different graphs is quite large (8 Mbs of DBLs, for example). I was thinking about reducing the amount of memory used when I found a document at National Instruments Developer Zone (http://zone.ni.com/devzone/conceptd.nsf/webmain/6A56C174EABA7BBD86256E58005D9712?opendocument), and inside that paper there was a paragrpah, "Fast Data Display with Decimation", that was perfectly suitable to me.
However, there is a drawback. If the user uses the zoom tools inside the Graph Palette to enlarge the decimated signal, and I do not take care of that situation in some way, doing so will result in an incorrect view since he will not be worki
ng with the original signal. Through events I am not able to know when the user has specifically zoomed the signal, not only touched the graph, so here are the questions: does anyone know a way to detect when the user has used the Graph Palette or the other items of the Waveform graph as the Scale Legend, for example? In general, is there a way that you can reduce the amount of points showed in a graph and still work with zooming tools without problems?
Thanks in advance and have a nice day,
spj

The things you say in your comment are right. In fact, that was what I had to do to fix the problem. Let me explain myself a little further.
I needed to reduce the memory, so I decimated the signal. To take care of the zoom bussiness, in my Diagram Block I put an event case to warn me when the mouse left the graph in order to do exactly what you have mentioned: with the original signal and the new limits, being aware of the x-multiplier, re-decimate the signal if necessary.
But that is when my problem arises. I am not able to distinguish when the user is really zooming the signal or merely touching the graph, without zooming anything. Now you can see the reason of my questions.
Thanks for your interest, Joe, and have a nice day,
spj

Slow Zoom In/Out in XY Graph

I am experiencing very slow zoom in/zoom out in XY Graph. Each action takes roughly 5 seconds. Is this normal?
The anti-aliased is not On. I am not using dash lines.
Can someone shed some light here?

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.
Lynn

Adf Dvt bar graph zoom/scrolling to given zoom level

Hi,
I am developing a dashboard, where I need a functionality with bar graph, that will zoom bar graph at particular zoom level while loading.
Please help me, How can I pass zoom level to bar graph to zoom in at loading time?
Thanks,
Jassi

Thanks Vlad for response,
<dvt:barGraph id="barGraph" subType="BAR_VERT_STACK" shortDesc="Query Result Graph"
tabularData="#{demo.graphTabularDate}" seriesRolloverBehavior="RB_HIGHLIGHT"
animationOnDisplay="auto" animationOnDataChange="alphaFade"
dynamicResize="DYNAMIC_SIZE" imageFormat="AUTO" visualEffects="AUTO"
binding="#{demo.graph}">
<dvt:o1Axis scrolling="on" /> 
<dvt:legendArea scrolling="asNeeded" automaticPlacement="AP_NEVER" position="LAP_RIGHT" />
<dvt:o1TickLabel tickLabelSkipMode="TLS_AUTOMATIC"/>
</dvt:barGraph>

Zooming out in example "Simple Graph" does not work.

In Measurement Studio, VC++, the feature "Zooming out" does not work. I only can zoom in a graph by drawing a rectangle with the left mouse button.

There isn't a built in "zoom out" functionality with the graph. There are several zoom modes of the graph, but if you want to zoom out, say with a right click or a key press, you would have to implement it yourself as it is not built-in.
Best Regards,
Chris Matthews
Measurement Studio Support Manager

How to re-autoscale a XY Graph after manual zooming?

Hello,
i have a dialog-window that shows an XY-graph. Using the "Graph Palette" i can zoom into the displayed graph.
But how can i return to the original displayed graph after using the zoom/move functions?
Thx
Solved!
Go to Solution.

Hi One,
graph axis is controlled by the axis properties as described in the help.
Read the help for "Scale Fit"…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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

Labview Graph Palette Taking Outputs

Hi,
is there any way to take the output of Labview Graph Palette i.e. when I zoom in can i access the minimum and maximum values of the zoomed in scales.
What I am trying to do is scanning a square and displaying data on an intensity graph. SoI wanted to add a feature which enables me to zoom in on the graph then take the values of the new scales and scan the zoomed in area again in the instrument.
So, is this possible?
Thanks,
Yatin

In LV8.5 (not sure about 8.2) you get "scale change" events, so with an
event structure you get new ranges every time they change.
In <LV8.5 the only option is to poll the range properties of the graph.
Regards,
Wiebe.

How to use the Zoom for Pocket PC 2003?

I try to use the LabVIEW7.1 PDA module zoom feature in my Pocket PC 2003. But I can not make it works right. For example, if I try to zoom to rectangle, the graph does not draw in the selected rectangle.
I attached my code.
Attachments:
sin.vi ‏48 KB

Hello,
I have taken a look at your vi and believe I understand your problem. The vi works if you allow the sine wave to draw to completion and then zoom in on a certain part of the graph. You cannot zoom while the graph is still drawing because the Zoom button click is not registered. Your program is looping inside the case structure for the run button so it does not see that the zoom button is pressed.
Also, I see that when you click Zoom and then draw the sine wave, the wave is not drawn inside the selected area. The graph goes back to its default values. This behavior is because the x and y max and min are set inside the graph properties. Whether this is set by autoscaling or by setting the max and min in the graph properties page, these values overwrite the zoom rectangle values. In LabVIEW for the PC you can set max and min values programmatically through property nodes. However, property nodes are currently not supported in LabVIEW for PDA. So, unfortunately there is no current way to programmatically change the values so that the sine wave is drawn inside the selected zoom region.
Thanks,
Caroline
National Instruments
Thanks,
Caroline Tipton
Data Management Product Manager
National Instruments

Cursor Misalignment in Intensity Graph (LV6.1)

Howdy.
I have an Intensity Graph, with a 2D array of data (about 300x300) and a cursor. The cursor is locked to the plot, which for intensity graphs, means that the cursor is drawn at the lower left corner of the pixel that is being addressed.
Most of the time this works fine. However, sometimes, the cursor is drawn as being located at one pixel, but the values reported for the cursor are in fact a neighbor (usually the one to the right). The zoom level of the graph is such that a given pixel is larger than a screen pixel (about 3-5 times), so I wouldn't think that it was an aliasing problem, but the problem does go away if I zoom in a little further.
Has anyone else seen this? Does anyone have a fix?

I don't have a repeatable set of conditions that lead to this problem, so I don't have a demo vi that exhibits it.
As to unlocking the cursor, I think that in an intensity plot that is more confusing; the location and value reported for a cursor position are shifted half a pixel down and half left with respect to the way the plot is filled in. In other words, say we have a 10x10 plot shown in 100x100 pixel window. Each intensity value is 10 pixels wide. The axis values line up on the boundaries of these pixels. When the cursor is within half a unit (5 pixels) of the crossing point of these axes, that is, near the intersection of boundaries of four adjacent pixels, the value reported is the pixel location and value in the upper right of these four pixels. This means that with an unlocked cursor, I can be positioning it over (visually) the lower left pixel, but selecting the upper right. In fact 3/4 of any given pixel's visual representation is actually going to select some other pixel. So I've locked the cursor to remove that uncertainty; now it is supposed to be always in the lower left corner of the pixel selected.

Zooming in on a graph

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