Hongquan Niu wrote:
>
> Hi, Rooters,
>
> I have three questions:
>
> 1. I basicly can follow the example to call CERNLIB routines,
> but now I am dealing with complex type in fortran, for example
> complex*16 wwerf(Z), and I am wondering how should I declare
> wwerf in CERNfunctions.h.
>
wwerf is not a very long Fortran function. Making the interface
with your code depends mainly on how you deal with complex*16 in your
C++ code. I assume you already have a class Complex somewhere.
I think that interfacing with fortran will be a mess. It might be
faster to reimplement the wwerf code in C++!
> 2. I have a class which has member functions in the format like
> Double_t myclass::funcs(Double_t *x,Double_t *par), I want to
> have a methord to draw this function, but since it is not
> pure function, how can I acheive this?
>
The TF1 class expects an argument of the type
Double_t funcs(Double_t *x, Double_t *par)
You should call your class member function from this C static function.
> 3. Can I include a picture, for example in gif format, in an
> existing canvas?
>
This facility has been implemented and never announced. The reason is
that a good implementation requires to be able to :
- grow/shring the pad containing the image (like XV is doing).
The current implementation does not allow that.
- get the image on Postscript.
If you want to try, you can do the following:
{
TCanvas *c1 = new TCanvas("c1","gif image",10,10,600,500);
c1->SetFillStyle(3101);
//the trick is to create a TNamed object with
// a name gifxxxx where xxxx is 3101,3102... up to 3199
// a title containing the name of the gif file
//and to add this named object to the list of "special" Root objects
TNamed *gif = new TNamed("gif3101","mypict.gif");
gROOT->GetListOfSpecials()->Add(gif);
//now draw a histogram on top of the background gif image
hpx->Draw();
}
Rene Brun
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