Export a png about pyobsplot HOT 11 CLOSED

PNG export would indeed be really useful, but it is much harder to implement than SVG export, because you need a complete HTML renderer (such as a browser) to convert to a bitmap image file.

Maybe I'll try to see how other libraries implement this.

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Observable use this. Happy to try adding a function to pyobsplot-js if you think that would make sense

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Oh I didn't know about this, it seems really promising ! Where did you see that Observable uses it ?

If you want to try to integrate it in pyobsplot, of course don't hesitate. Maybe the difficulty will be to make it work in both the jsdom and widget renderers, but it is definitely worth a try.

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Great - I'll give that a go. It was mentioned in a discussion here.

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This was unfortunately the case for html-to-image "but it is much harder to implement than SVG export, because you need a complete HTML renderer (such as a browser) to convert to a bitmap image file.". In Observable notebooks the figure has already been rendered in the browser so export to png via html-to-image is possible.

I've had a look at what other visualisation libraries do and they all appear to take a similar approach as described here. A simple approach that worked but proved limited was using the python package html2image. The issue I had was getting the correct width and height. If the html just contains an SVG tag then there's no issue we can grab the width and height attributes. However, if there is a title/legend/caption etc. then the height will be too small.

Bokeh has an implementation to dynamically get the width and height which we could try and borrow when the figure is a HTML object (export_to_png and dynamically estimate width & height )?

Not ideal, there would also need to be an additional docs section similar to this.

Let me know what you think

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