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Knowners is a semantic visualization plugin, produced by FakePress and Art is Open Source. It is meant as a large-scale part of your wordpress interaface, where you can host a beautiful interactive graph that shows the semantic structure of your blog. Full HTML5 and Canvas support. Interaction.
Knowners is not a widget, but rather a wordpress extension that you can call in your theme templates.
This new version works directly on POSTS and the network visualization is built automatically using tags.
As with the other versions, follow these steps to install the plugin:
 unzip the archive in your wordpress plugin folder (you should obtain a ?knowners? directoty containing a bunch of files) go to your WordPress dashboard, to the section ?Plugins? identify the ?knowners? plugin in the list and click ?Activate? insert the PHP command knowners_render_posts() in your templates wherever you wish to display your POST-based visualization insert the PHP command knowners_render_links() in your templates wherever you wish to display your LINKS-based visualization you?re set! 
remember that the plugin is designed to occupy a large area: displaying it in a small div or other HTML container might not come out too nice.
The plugin automatically fills all the container it has been placed into.
The Knowners functions can be called anywhere in your theme and will take up all the space of the container in which they are called.
Please note that this plugin is designed to occupy lots of space: you will get awful results if you call it in smaller ones.
Please check out the plugin website for an example of its usage, so that you can get the feel of what you can achieve and please check back real soon for the updates, including the improved editing facilities and navigation tools.

knowners

Knowners is a semantic visualization plugin, produced by FakePress and Art is Open Source.

sohel razzaque

This plugin will added to your wordPress side a nice and easy pie chart.you can change pie chart total area width,single pie chart area width,total area background colour,pie chart circle text colour and also change text colour & other setting from “pie_chart” menu in dashboard. This plugin will enable pie chart your wordpress theme. You can embed pie chart via shortcode in everywhere you want, even in theme files .
Shortcodes
shortcode in dashboard page/post/widgets
[pie_chart_list category=”category come to post*”]
shortcode in theme page
*post category and attribute category are same
<h4>Plugin Features</h4>
<ul>
<li>you can change pie chart total area width</li>
<li>you can change single pie width</li>
<li>you can change background colour</li>
<li>you can change pie chart circle text colour</li>
<li>you can change pie chart text colour</li>
<li>you can add category in your pie chart</li>
</ul>

sr-piechart-wp

Easily create and manage  a piechart .Get a Fancy jQuery Pie Chart with a simple shortcode

knowners vs sr-piechart-wp