How to draw an irregular polygon ?

Hi ..
the question looks simple...but maybe isn't it as it sounds..
I want to draw an irregular shape.. as this :
IMAGE2D

I would like to know it there are an object and the methods in oreder to to build an irregular shape.
How can I tesselete an irregular shape in two dimensions

If You have any suggestion please tell me something about it..
I'm a bit confused about tesselletion in this case.

Thanks in advance





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How to draw an irregular polygon ?