@mattab opened this Issue on August 7th 2012 Member

Currently, for users to generate graphs with unicode characters (japanese, chinese, arabic, etc.) users need to [http://piwik.org/faq/how-to-install/#faq_142
upload on their server the unitfont.ttf as explained in this faq]

Obviously this is not user friendly.. it's not even explained in the UI, so users will have to browse the FAQ or doc to find out.

Instead we could:

  • if the unifont is not found in the expected path, and if the user is using the UI in any language we know needs unifont, display in General Settings a little warning / notice message explaining that the font is needed.
  • the first time the unifont is needed to generate a static graph, in the language it is known to be required:
    • if there is no right permission in the folder to put the font
      piwik/plugins/ImageGraph/fonts/unifont.ttf we could write in tmp/assets/unifont.ttf
    • if still no permission, cancel
    • we could then attempt to download the font from the piwik server or the official original server (if it is mirrored?)
    • The request to download should handle redirect ie. $followDepth = 3 or so
    • if the download fails, set a flag
    • Do we retry downloading later, or fail once and do not try again, ie. generate the graph with the default font?

See related code to refactor a bit: https://github.com/piwik/piwik/blob/master/plugins/ImageGraph/API.php#L110

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