zoom a plot

Community matplotlib-users
1

Hi, I use matplotlib to create a png file, then display it in a web browser. All works fine. Now I want to zoom the plot. What I can think of is:

  1. Get coordinates (x1, y1), (x2, y2) of the image when user makes an area selection on the image;

  2. Convert (x1, y1), (x2, y2) to the real values matplotlib was plotting;

  3. Request matplotlib to create a new png file using the updated area values.

Could anybody please let me know how to accomplish step 2?

Many thanks,

Tom

2

I don’t think you’ll get acceptable performance out of that workflow.

I recommend looking into the webagg backend: http://matplotlib.org/users/whats_new.html#webagg-backend

···

On Mon, Sep 15, 2014 at 8:38 AM, Xiaobo Yang <xiaobo.yang@…287…> wrote:

Hi, I use matplotlib to create a png file, then display it in a web browser. All works fine. Now I want to zoom the plot. What I can think of is:

  1. Get coordinates (x1, y1), (x2, y2) of the image when user makes an area selection on the image;
  1. Convert (x1, y1), (x2, y2) to the real values matplotlib was plotting;
  1. Request matplotlib to create a new png file using the updated area values.

Could anybody please let me know how to accomplish step 2?

Many thanks,

Tom

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3

Thank you for your quick answer. I understand the performance issue you
mentioned. For now it is only a proof of concept.

I just figured out how to do it in theory by using
figure.subplot.left|right|bottom|top plus a few other settings.

I'll certainly look at the webagg backend. Are there any examples available?

···

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4

Yes. They are on the same webpage to which I linked earlier.

http://matplotlib.org/search.html?q=codex+webagg&check_keywords=yes&area=default

···

On Mon, Sep 15, 2014 at 9:28 AM, Tom Young <xiaobo.yang@…287…> wrote:

Thank you for your quick answer. I understand the performance issue you

mentioned. For now it is only a proof of concept.

I just figured out how to do it in theory by using

figure.subplot.left|right|bottom|top plus a few other settings.

I’ll certainly look at the webagg backend. Are there any examples available?

–

View this message in context: http://matplotlib.1069221.n5.nabble.com/zoom-a-plot-tp43952p43954.html

Sent from the matplotlib - users mailing list archive at Nabble.com.

Want excitement?

Manually upgrade your production database.

When you want reliability, choose Perforce

Perforce version control. Predictably reliable.

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