For my topic (Hiveplot implementation). I made one new layout called RTRectLineLayout. That takes angle in parameter and draw your line with angle about origin (0,0).

Should I add this implementation to Roassal ?

Few screens about :

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Here, one example of code : 

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I created two constructors with vertical and horizontal angle.

What do you think about it ?

If you want, how can I commit this ?

Thank you,

Cheers,

Jonathan.