PNG from HTML5 Canvas

[Hermann Stern]

I use Python 3.3 to generate html pages like the one here:

http://www.obermatt.com/en/index/new-zealand-stock-exchange-nzsx-50-nz50cap/top-10-stocks-2014-02-07.html

Now I would like to use pyPNG to generate a PNG from the table in this page (e.g. from the table Top 10: Value Investment Strategy). It contains div elements (the horizontal bars). How would I go about this using Python only?

[David Jones]

Basically, you don't do this using Python only, and you don't do it using PyPNG.

There are many ways of doing this, I am not expert in any of them, but
you probably want something like webkit2png:

http://www.paulhammond.org/webkit2png/

WebKit is the partly Apple-developed open source library that lies
behind the HTML rendering of the Safari browser. Webkit2png uses the
same library to render to a PNG file.

Another approach might be to use Selenium:
http://stackoverflow.com/a/6282203/242457

Selenium is basically a way of programming a real web browser. It's
often used for testing webapps, and scraping data of hard-to-get
websites.


Oh hold on, do you want a screenshot of that table? Or do you want a
graph drawn using the data in the table? Above, I assumed you wanted a
screenshot, but then I just realised it's possible you want something
else entirely.

Cheers,
drj

[Hermann J. Stern]

David

You are right. Screen Shots are not exactly what I want. I want to
generate high resolution graphs with html5 commands. So a canvas
element would convert into a the same graphic in the PNG file.
Ideally, the whole thing would happen in Python 3.

Hermann

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