On 12 Jun 98 at 14:48, Rutger van der Eijk wrote:
> 3) TELTU seems to be implemented as a normal cylinder, not as a
> cylinder with elliptical cross section.
Just an idea:
1. Rename the TTUBE class to TELSTU (may be ?)
2. Change the ctor of class:
TTUBE::TTUBE(Text_t *name, Text_t *title, Text_t *material, Float_t rmin, Float_t rmax, Float_t dz
,Float_t aspect=1)
adding one extra parameter as above:
3. Add one extra data member and one method:
i.e instead of
class TTUBE : public TShape {
protected:
Float_t fRmin; // inside radius
Float_t fRmax; // outside raduis
....
[snip]
....
}
class TELTU : public TShape {
protected:
Float_t fRmin; // inside the ellipse semi-axis in X
Float_t fRmax; // outside the ellipse semi-axis in X
Float_t fAspectRatio; // defines (the ellipse semi-axis in Y)/(the ellipse semi-axis in X)
....
[snip]
....
public:
....
[snip]
....
virtual void SetAspectRatio(Float_t factor=1)(fAspectRatio = factor;}
virtual Float_t GetAspectRatio()(return fAspectRatio;}
....
[snip]
....
}
3. Change two lines of the method void TTUBE::SetPoints(Float_t *buff):
instead of:
buff[indx+6*n] = buff[indx] = fRmin * fSiTab[j];
write:
buff[indx+6*n] = buff[indx] = fAspectRatio*fRmin * fSiTab[j];
afterwards this class will be able to draw all kind of elliptic
tube (the cylindrical one included too).
I've tried and it works very well.
The corrections sent to ROOT team. In theory the same
could be done for all "cylindrical" classes ike
TPCone TCone, TCons etc and even for TSphe
(for TSphe two aspect rations should be introduced to draw ellipsoids).
Hope this helps,
Valery
=================================================================
Dr. Valeri Faine (Fine)
------------------- Phone: +1 516 344 7806
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Dr. Valery Fine Telex : 911621 dubna su
-----------
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