Dear authors of ROOT,
I feel uncomfortable when I compare the code of TTRAP::SetPointss() with
the one of TGTRA::SetPoints(). As I understand, a TGTRA must become a TTRAP
when the angle "twist" is set to 0. A first look at the code of the 2
routines show that it is not the case. A second look indicates that may be
it is not wrong, because the author of TTRAP::Setpoints() look at the angle
theta from the middle in z of the shape, but the author of
TGTRA::SetPoints() look at the angle theta from the bottom of the shape.
Hence the appearance of factors 2 in the code of TGTRA::SetPoints().
But what really worries me is the fact that in TTRAP::SetPoints()
Tan(theta) appears everywhere, and in the code of TGTRA::SetPoints()
Sin(theta) appears everywhere.
I do not see how this difference in the views of the presumably different
authors of the 2 methods could change a Tan into a Sin ?
Could a specialist of this part of ROOT have a look at it ?
Thanks very much.
F.X. Gentit
DAPNIA/SPP CEN Saclay
tel : 01 69 08 30 38 fax : 01 69 08 64 28
web : http://home.cern.ch/~gentit/
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