[OpenLayers-Users] How to display polygon length dimensions

[summer7310]

Hello all,
        I draw a polygon or a regular polygon,but when finish draw it .I
want to display the dimension of every polygon length,just like this 
<http://osgeo-org.1560.x6.nabble.com/file/n5069252/QQ%E6%88%AA%E5%9B%BE20130729104659.png> 
if any body know how to do it ,thank you very much.



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