[PyQt] Need help to create graph node and movable slider as shown in the image.

[tabish-->]

http://www.nabble.com/file/p24655601/shotgun1.jpg 
http://www.nabble.com/file/p24655601/houdini.jpg 

Please help me out how can i proceed in developing these features.
the colored slide bar and the node graph.
please help i am stuck.
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