Thank you for your comments.
It helps, but it's still not very clear to me.

I've added a few elements to the drawing to help me.
Image and code (a bit messy) attached.





-- 
Kurtz le pirate
Compagnie de la Banquise

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Attachments:
Download 'code.tgz.gz' (3 KB) Download 'drawing_bezier_spline.png' (54 KB)

Preview of image 'drawing_bezier_spline.png'