Fons Rademakers writes:
> Hi Pasha,
>
> the answer is scope. In the function example the TPaveLabel pel
> is deleted as soon as the function returns (stack variable goes out
> of scope and dtor deletes it from canvas). Use new to create TPaveLabel.
>
Hi Fons,
suppose that I have a complex object, say , drift chamber, drawing of which
requires ~10**5 graphics primitives to be put on the screen (hits, wires...)
- CDF central drift chamber for example has 3*10**4 wires:
class DRIFT_CHAMBER : public TObject {
...
void Draw (Option_t* opt);
...
};
DRIFT_CHAMBER DriftChamber;
How it is possible to draw a DriftChamber thing on the screen w/o allocating
dynamically an object per graphics primitive, but having
DRIFT_CHAMBER::Draw method drawing all of them?
Some time ago we ran into a problem with having object per primitive with OpenGL,
where there is a limit on the number of objects to be put into selection stack...
Thanks a lot, Pasha.
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