XY graph zoom problem

Hello,
There is a issue when you zoom in using a XY graph. Say you have a two points one at 0,0 and another at 10000,10. If you zoom in to say point 5000,5 the centre point the line will be way off nowhere near where it should be crossing. I was wondering if anyone knows a fix for this problem?
Thanks

I agree that this does not look right, but is probably due to limitations in the math used. Once you zoom into the area of iterest, the position of the line actually changes as a function of zoom level. (for example, the 5000 crossing of the line is at 5.00, then at 5.015, then at 5.16). I am sure the accuracy it could be improved, but maybe at a cost of performance.
It should definitely be investigated.
LabVIEW Champion . Do more with less code and in less time .

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XY Graph Cursor Problem in Labview 7.1.1?

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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).
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it would be difficult to post complete code so i m posting the important part of my code related to this zoom problem.
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Hi mimages!
Thank you for posting.
Based on your description, the camcorder will need to be examined by a technician at our Factory Service Center. To start this process, you'll need to complete a Repair Request on our website.
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

Is there any way to help aid this annoying wallpaper zoom problem?

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Attachments:
worldmap.zip ‏364 KB

The problem isn't with the notifier mechanism (although that code can be simplified). The problem is with the way you're calculating the new ranges and increments. When the calculations are done the proportions of the graph are not kept consistent, thereby causing a stretching of the "figure". Also, you are not putting a limit on the XScale.Increment and YScale.Increment such as when you hit the max/min scale ranges. This means that you can continue to "zoom out", with no chance in the scale, but the increment values keep increasing. This throws off the calculations when you try to "zoom back in".
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Hi Jonni,
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Regards
JamesC
NIUK and Ireland
Attachments:
Use Axis range as zoom.vi ‏15 KB

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Message Edited by Kalman on 06-19-2008 01:58 AM
Attachments:
graph_range_problem2.vi ‏24 KB

Frederik,
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hope this helps,
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CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.
Attachments:
Scaling.vi ‏25 KB

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There's no dignity in begging for kudos. Do it for the karma.

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There's no dignity in begging for kudos. Do it for the karma.

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Normally I would be happy to help you, but after several years of trying to help here, I've decided not to contribute anymore because of the piss-poor way in which this site is being administered.
Others are still helping, but more may leave if things don't improve. May I recommend devshed or javaranch?
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http://www.javaranch.com/
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XY graph zoom problem

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