Hi,
do TCanvas::Paint() instead of TCanvas::Update().
To display it use:
TCanvas::Flush();
(maybe you have to call TCanvas::FeedbackMode(kFALSE) before Paint())
Thomas.
Valeriy Onuchin wrote:
> Hi Paolo,
> as far as I understood you would like to set your own procedure
> when to display content of canvas. A solution would be creation
> class MyCanvas derived from TCanvas with PaintModified() overloaded, e.g
>
> void MyCanvas::PaintModified()
> {
> if (!gReadyToShow) return;
> else TCanvas::PaintModified();
> }
>
> and put MyCanvas objects into TRootEmbeddedCanvases instead of TCanvases
> Calling TCanvas::Update will not display canvas untill gReadyToShow flag is set on.
>
> Regards. Valeriy
>
>
> Hi Valeriy,
>
> no, I meant only to prepare the TRootEmbedded canvas in memory in the final
> form as I see it on screen but without displaying it.
>
> Paolo
>
> On Monday 23 June 2003 10:12, you wrote:
>
>> Hi Paolo,
>>not clear for me "fill completely the picture in memory ".
>>Does it mean a picture of the whole of "Display Window"?
>>
>>Regards. Valeriy
>>
>>
>>>Hi all,
>>>
>>>I would like to hear your opinion about the following ideas.
>>>
>>>In my program I built a Display Window which is essentially composed by a
>>>matrix of TRootEmbeddedCanvas. In every Embedded Canvas is painted an
>>>histogram. Now I would like to fill completely the picture in memory to
>>>display it only when it is needed: the effect should be of a "ready to
>>>see" picture appearing on the screen. I know that TRootEmbeddedCanvas
>>>creates a TGCanvas in which a TCanvas is created, and that a TCanvas is
>>>built using "double buffer" tecnique, but I can't figure out how I can
>>>achieve the "ready to see" effect (perhaps using TPad::CopyPixmaps()?).
>>>
>>>Just for example I attach my present code.
>>>Thanks,
>>>
>>>Paolo
>>>
>>>
>>>/************************************************************************
>>>*** TC_ScrollingTabFrame.cpp - description -------------------
>>> begin : Thu May 8 2003
>>> copyright : (C) 2003 by Paolo ADRAGNA
>>> email : paolo.adragna@pi.infn.it
>>>
>>>*************************************************************************
>>>**/
>>>
>>>/************************************************************************
>>>*** *
>>> * * This program is free software; you can redistribute it and/or
>>>modify * * it under the terms of the GNU General Public License as
>>>published by * * the Free Software Foundation; either version 2 of the
>>>License, or * * (at your option) any later version.
>>> * *
>>> *
>>>*************************************************************************
>>>**/
>>>
>>>#include "TC_ScrollingTabFrame.h"
>>>#include "TC_CanvasUpdateAsynch.h"
>>>
>>>ClassImp(TC_ScrollingTabFrame)
>>>
>>>TC_ScrollingTabFrame::TC_ScrollingTabFrame() :
>>>TGCanvas(GetViewPort(),700,650) {}
>>>
>>>TC_ScrollingTabFrame::TC_ScrollingTabFrame(TGTab * tab, char *grp, char *
>>>nam, Int_t id_, Int_t nhs, TH1 *hist[], char *options[], char
>>>*Poptions[]) : TGCanvas(tab,550,650)
>>>{
>>>
>>> status = 0;
>>> group = new TString(grp);
>>> name = new TString(nam);
>>> id = id_;
>>>
>>> // Make a new tab explicitly building it, instead of calling Add in
>>>order to add a ScrollingTabFrame
>>> tab->AddFrame(new TGTabElement(tab, new TGString(nam), 50, 20,
>>>tab->GetDefaultGC().GetGC(),
>>>tab->GetDefaultFontStruct()),
>>> 0);
>>>
>>> fFrame = new TGCompositeFrame(GetViewPort(), 60, 20);
>>> fFrame->SetLayoutManager(new TGMatrixLayout(fFrame,0,2,10));
>>> SetContainer(fFrame);
>>>
>>> TStyle *myStyle = (TStyle*) gROOT->FindObject("Plain1");
>>> if(myStyle)
>>> {
>>> myStyle->cd();
>>> }
>>> else
>>> {
>>> printf("Warning. Style Plain1 not founded\n");
>>> }
>>>
>>> int i;
>>> for (i=0;i<nhs;i++)
>>> {
>>> char *s = new char[30];
>>> sprintf(s,"%s_%i",nam,i);
>>> TRootEmbeddedCanvas *fECanvas = new
>>>TRootEmbeddedCanvas(s,fFrame,300,250);
>>> ecanvas.push_back(fECanvas);
>>> TCanvas *c = fECanvas->GetCanvas();
>>> if(strcmp(Poptions[i],"Logy") == 0) c->SetLogy();
>>> c->cd();
>>> c->AddExec("Popuppad","TC_ScrollingTabFrame::PopUpPad()");
>>> hist[i]->Draw(options[i]);
>>> AddFrame(fECanvas);
>>> }
>>>
>>>}
>>>
>>>TC_ScrollingTabFrame::~TC_ScrollingTabFrame()
>>>{
>>> for(int i=0; i<(int)ecanvas.size(); i++)
>>> {
>>> delete ecanvas[i];
>>> }
>>> delete fFrame;
>>>}
>>>
>>>void TC_ScrollingTabFrame::PopUpPad()
>>>{
>>> int event = gPad->GetEvent();
>>> if(event == 61)
>>> {
>>> TObject *select = gPad->GetSelected();
>>> if (!select) return;
>>> // For a TH1 the selectd object is a TFrame, not the TH1
>>> // So we must select it
>>> if (!select->InheritsFrom("TH1"))
>>>{
>>> TList *primitives = gPad->GetListOfPrimitives();
>>> TListIter next(primitives);
>>> TObject *to;
>>> while ((to=next()))
>>> {
>>> if(to->InheritsFrom("TH1")) {select = to;}
>>> }
>>>}
>>> if (select->InheritsFrom("TH1"))
>>>{
>>> Int_t logy = gPad->GetLogy();
>>> TH1 *h = (TH1*)gROOT->FindObject(select->GetName());
>>> char *name = new char[100];
>>> sprintf(name,"padCanvas%s",h->GetName());
>>> TCanvas *canvas = new TCanvas(name,h->GetTitle(),600,400);
>>> new TC_CanvasUpdateAsynch(canvas,(Long_t)2000);
>>> sprintf(name,"padPad%s",h->GetName());
>>> TPad *p = new TPad(name,h->GetTitle(),0.05,0.05,0.95,0.95);
>>> if(logy) p->SetLogy();
>>> p->Draw();
>>> p->cd();
>>> file://TStyle *myStyle = new TStyle("Plain2","Generic");
>>> file://myStyle->SetTitleFont(42);
>>> if(select->InheritsFrom("TH2F"))
>>> {
>>> file://myStyle->SetOptStat(10);
>>> TStyle *myStyle = (TStyle*) gROOT->FindObject("PlainPopup2");
>>> if(myStyle)
>>>{
>>> myStyle->cd();
>>>}
>>> else
>>>{
>>> printf("Warning. Style PlainPopup2 not founded\n");
>>>}
>>> h->Draw("lego2");
>>> }
>>> else
>>> {
>>> file://myStyle->SetOptStat(111111);
>>> TStyle *myStyle = (TStyle*) gROOT->FindObject("PlainPopup1");
>>> if(myStyle)
>>>{
>>> myStyle->cd();
>>>}
>>> else
>>>{
>>> printf("Warning. Style PlainPopup1 not founded\n");
>>>}
>>> h->Draw("hist");
>>> }
>>>
>>>}
>>> }
>>>}
>>>
>>>void TC_ScrollingTabFrame::SetVisibleFlag(bool flag)
>>>{
>>> status = GetSelectedFlag();
>>> if (flag) { status = DW_SELECTED | DW_VISIBLE; }
>>>}
>>>
>>>void TC_ScrollingTabFrame::SetSelectedFlag(bool flag)
>>>{
>>> status = 0;
>>> SetVisibleFlag(flag);
>>>}
>>>
>>>Bool_t TC_ScrollingTabFrame::ProcessMessage(Long_t msg, Long_t parm1,
>>>Long_t parm2)
>>>{
>>> return TGCanvas::ProcessMessage(msg,parm1,parm2);
>>>}
>>>
>>>void TC_ScrollingTabFrame::Update()
>>>{
>>>
>>> if((!GetVisibleFlag()) || (ecanvas.size()<=0) ) {return;}
>>>
>>> TStyle *myStyle = (TStyle*) gROOT->FindObject("Plain1");
>>> if(myStyle)
>>> {
>>> myStyle->cd();
>>> }
>>> else
>>> {
>>> printf("Warning. Style Plain1 not founded\n");
>>> }
>>> for(int i=0; i<(int)ecanvas.size(); i++)
>>> {
>>> TCanvas *c = ecanvas[i]->GetCanvas();
>>> c->Modified();
>>> c->Update();
>>> }
>>>}
>
>
>
>
>
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:12 MET