Hi Thomas
What you need is the way to convert PixmapID of TCanvas to Drawable_t
id,
that TPutImage can be feed with.
I'll try to provide this in a couple of hours, I have to attend some
meeting right now, Sorry.
----
Best regards
Valeri
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch] On
> Behalf Of Thomas Bretz
> Sent: Tuesday, May 04, 2004 9:13 AM
> To: Rene Brun
> Cc: Thomas Bretz; roottalk@pcroot.cern.ch
> Subject: Re: [ROOT] gVirtualX->PutImage and TCanvas
>
> Hi Rene,
>
> yes, I know. I more or less graped the code I did from there. However
I
> need a fast and direct access without intermediate scaling steps or
> similar. I want to make 100% sure, that I get exactly the bitmap I got
> from my CCD on the screen and I want to render as direct as possible
> into the bitmap data. Converting 8bit data into doubles and back does
> for sure not fullfill the requirements.
>
> Thanks anyhow,
> Thomas.
>
> On Tue, 4 May 2004, Rene Brun
> wrote:
>
> > Hi Thomas,
> >
> > You will find below a short example illustrating the TASImage class.
> > You can change teh filling of the buffer at your will.
> >
> > Rene Brun
> >
> > void test()
> > {
> > gSystem->Load("libASImage");
> > TCanvas *c=new TCanvas;
> > double buf[100*100];
> > for (int j=0; j<100*100; j++)
> > buf[j]=j;
> >
> > TASImage *i = new TASImage("image",buf,100, 100);
> > i->Draw();
> > }
> >
> >
> >
> > Thomas Bretz wrote:
> > >
> > > Hi,
> > >
> > > with the (very simple) attached class I try to display a gray
scaled
> > > bitmap in a canvas. It doesn't work. Can somebody explain me, what
I'm
> > > doing wrong?
> > >
> > > (I'm developing this class, because I need a really fast access to
the
> > > screen - 25fps - which I think I won't get with the big overgead
of
> > > TASImage)
> > >
> > > Thanks in advance,
> > > Thomas.
> > >
> > >
------------------------------------------------------------------------
--
> ------
> > > Name: MImage2.cc
> > > MImage2.cc Type: unspecified type (APPLICATION/octet-stream)
> > > Encoding: BASE64
> > >
> > > Name: MImage2.h
> > > MImage2.h Type: unspecified type (APPLICATION/octet-stream)
> > > Encoding: BASE64
> > >
> > >
------------------------------------------------------------------------
--
> ------
> > > void test()
> > > {
> > > TCanvas *c=new TCanvas;
> > >
> > > MImage2 *i = new MImage2(100, 100);
> > >
> > > byte buf[100*100];
> > >
> > > for (int j=0; j<100*100; j++)
> > > buf[j]=j;
> > >
> > > i->DrawImg(buf);
> > > i->Draw();
> > > }
> >
>
> -----
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