On Tue, May 31, 2011 at 1:43 PM, Michal Čihař michal@cihar.com wrote:
Hi
Dne Tue, 31 May 2011 00:12:31 +0200 Tyron Madlener tyronx@gmail.com napsal(a):
I've added now a first version of my planned realtime charting on the status page in the 'Query statistics'-Tab (click on "Realtime chart"). You can check it out at http://demo.phpmyadmin.net/gsoc-tyron
Currently it aggregates the average queries per second by making an ajax request every 2-2.5 seconds (2 seconds + time for one ajax request). Since it is using the differential of the status var 'questions' it takes some seconds to display a line.
For the chart I'm currently using Highcharts because it allows realtime data, animates beautifully, is really small (1 file, 77kb minified) and has a export to png/pdf/jpg plugin (6.4kb minified) which however uses a highcharts.com server for the conversion.
Depending on external service is not something I would like to see.
Some radical suggestion in this regard: What about removing the included pChart and instead using a client-side charting library? I know for some part its bad since a student wrote a whole lot of code for it just last year, but looking at some requirements for phpmyadmin (no file storage, limited possibilities for data recording, panning/zooming, realtime updates) a server-side charting library offers much less possibilities compared to a client side-one. And if we'd use highcharts it would save us like 16 files and 750kb (well most of it is that dejavu font). I think it would be pretty easy to replace actually. Instead of the graph, the server-code would just need to send the already generated chart data hidden in the document and then we add a bit of js code to display the chart. Some code from chart.lib.php is probably reusable.
There has been lot of discussion what to use and we stick with sever side solution because it did allow saving of the images (what might be not that useful for server stats, while is definitely useful when drawing chart from query results) and does not require javascript (though this is less and less important nowadays).
Indeed. Since gis visualizations need to be saved I moved on to generate them on the server side. I'm writing the SVG tags accordingly and for the browser that does not support SVG (IE version <9) I am using the GD library to generate PNG images. On the client side I use jQuery SVG for zooming and panning, to give a better user experience. So with this solution, even without the JS support one can view the SVG image, while someone with JS support gets better user experience.
However for realtime charts, server side solution will indeed perform worse. And there is also need for some client side graphics library for spatial extensions, so I'd like to see one client side library used for both drawing spatial data and for charting.
Whether it will be possible to replace pChart or not later, that's IMHO different question (mostly depending on usable way of exporting charts out of client side solution).
-- Michal Čihař | http://cihar.com | http://blog.cihar.com
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