Solved
Pourquoi dans le fichier attaché ConvexHull({A,B,C,D}) retourne un polygone erroné ?
Files:
EnvConv.ggb
The same problem 
Pourquoi dans le fichier attaché ConvexHull({A,B,C,D}) retourne un polygone erroné ?
newly an update problem
move A
exact, bien attrapé
et pourtant j'avais "secoué" la figure de R-W
an update problem mean this is normal ?
When I look to this bug as black-box, then I see the following statements (in the attachment)
Workaround (with small difference between A and the corner of Convex-Hull)
if you zoom with the mouse then the problem disappear
Thanks, yes I see this (now) too.
Spekulation:
Moving A with the mouse follows a pixel unit.
This unit changes with the zoom.
This means that A can no longer be manually set to f with sufficient accuracy (?).
In this version this can be done with a new button.
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Another question is: what is the possible path or area of C.
But I think for the developer the hints in this version are good enough and far more than usual.
Thanks, we've add a new algorithm for v525 which should work better
v525 online
Thanks, Its works!
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