Tree

Display the Tree data structures

Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Monday, September 21, 2020 at 10:41 AM.

In [1]:
TCanvas* c1 = new TCanvas("c1","Tree Data Structure",200,10,750,940);
c1->Range(0,-0.1,1,1.15);

gBenchmark->Start("tree");

Int_t branchcolor = 26;
Int_t leafcolor   = 30;
Int_t basketcolor = 42;
Int_t offsetcolor = 43;
TPaveLabel* title = new TPaveLabel(.3,1.05,.8,1.13,c1->GetTitle());
title->SetFillColor(16);
title->Draw();
TPaveText* treePave = new TPaveText(.01,.75,.15,1.00);
treePave->SetFillColor(18);
treePave->SetTextAlign(12);
TText *tnt = treePave->AddText("Tree");
tnt->SetTextAlign(22);
tnt->SetTextSize(0.030);
treePave->AddText("fScanField");
treePave->AddText("fMaxEventLoop");
treePave->AddText("fMaxVirtualSize");
treePave->AddText("fEntries");
treePave->AddText("fDimension");
treePave->AddText("fSelectedRows");
treePave->Draw();
TPavesText* farm = new TPavesText(.01,1.02,.15,1.1,9,"tr");
TText *tfarm = farm->AddText("CHAIN");
tfarm->SetTextSize(0.024);
farm->AddText("Collection");
farm->AddText("of Trees");
farm->Draw();
TLine* llink = new TLine(.15,.92,.80,.92);
llink->SetLineWidth(2);
llink->SetLineColor(1);
llink->Draw();
llink->DrawLine(.21,.87,.21,.275);
llink->DrawLine(.23,.87,.23,.375);
llink->DrawLine(.25,.87,.25,.805);
llink->DrawLine(.41,.25,.41,-.025);
llink->DrawLine(.43,.25,.43,.075);
llink->DrawLine(.45,.25,.45,.175);
TPaveLabel* branch0 = new TPaveLabel(.20,.87,.35,.97,"Branch 0");
branch0->SetTextSize(0.35);
branch0->SetFillColor(branchcolor);
branch0->Draw();
TPaveLabel* branch1 = new TPaveLabel(.40,.87,.55,.97,"Branch 1");
branch1->SetTextSize(0.35);
branch1->SetFillColor(branchcolor);
branch1->Draw();
TPaveLabel* branch2 = new TPaveLabel(.60,.87,.75,.97,"Branch 2");
branch2->SetTextSize(0.35);
branch2->SetFillColor(branchcolor);
branch2->Draw();
TPaveLabel* branch3 = new TPaveLabel(.80,.87,.95,.97,"Branch 3");
branch3->SetTextSize(0.35);
branch3->SetFillColor(branchcolor);
branch3->Draw();
TPaveLabel* leaf0 = new TPaveLabel(.4,.78,.5,.83,"Leaf 0");
leaf0->SetFillColor(leafcolor);
leaf0->Draw();
TPaveLabel* leaf1 = new TPaveLabel(.6,.78,.7,.83,"Leaf 1");
leaf1->SetFillColor(leafcolor);
leaf1->Draw();
TPaveLabel* leaf2 = new TPaveLabel(.8,.78,.9,.83,"Leaf 2");
leaf2->SetFillColor(leafcolor);
leaf2->Draw();
TPaveText* firstevent = new TPaveText(.4,.35,.9,.4);
firstevent->AddText("First event of each basket");
firstevent->AddText("Array of fMaxBaskets Integers");
firstevent->SetFillColor(basketcolor);
firstevent->Draw();
TPaveLabel* basket0 = new TPaveLabel(.4,.25,.5,.3,"Basket 0");
basket0->SetFillColor(basketcolor);
basket0->Draw();
TPaveLabel* basket1 = new TPaveLabel(.6,.25,.7,.3,"Basket 1");
basket1->SetFillColor(basketcolor);
basket1->Draw();
TPaveLabel* basket2 = new TPaveLabel(.8,.25,.9,.3,"Basket 2");
basket2->SetFillColor(basketcolor);
basket2->Draw();

TPaveText* offset = new TPaveText(.55,.15,.9,.2);
offset->AddText("Offset of events in fBuffer");
offset->AddText("Array of fEventOffsetLen Integers");
offset->AddText("(if variable length structure)");
offset->SetFillColor(offsetcolor);
offset->Draw();
TPaveText* buffer = new TPaveText(.55,.05,.9,.1);
buffer->AddText("Basket buffer");
buffer->AddText("Array of fBasketSize chars");
buffer->SetFillColor(offsetcolor);
buffer->Draw();
TPaveText* zipbuffer = new TPaveText(.55,-.05,.75,.0);
zipbuffer->AddText("Basket compressed buffer");
zipbuffer->AddText("(if compression)");
zipbuffer->SetFillColor(offsetcolor);
zipbuffer->Draw();
TArrow* ar1 = new TArrow();
ar1->SetLineWidth(2);
ar1->SetLineColor(1);
ar1->SetFillStyle(1001);
ar1->SetFillColor(1);
ar1->DrawArrow(.21,.275,.39,.275,0.015,"|>");
ar1->DrawArrow(.23,.375,.39,.375,0.015,"|>");
ar1->DrawArrow(.25,.805,.39,.805,0.015,"|>");
ar1->DrawArrow(.50,.805,.59,.805,0.015,"|>");
ar1->DrawArrow(.70,.805,.79,.805,0.015,"|>");
ar1->DrawArrow(.50,.275,.59,.275,0.015,"|>");
ar1->DrawArrow(.70,.275,.79,.275,0.015,"|>");
ar1->DrawArrow(.45,.175,.54,.175,0.015,"|>");
ar1->DrawArrow(.43,.075,.54,.075,0.015,"|>");
ar1->DrawArrow(.41,-.025,.54,-.025,0.015,"|>");
TLine* ldot = new TLine(.95,.92,.99,.92);
ldot->SetLineStyle(3);
ldot->Draw();
ldot->DrawLine(.9,.805,.99,.805);
ldot->DrawLine(.9,.275,.99,.275);
ldot->DrawLine(.55,.05,.55,0);
ldot->DrawLine(.9,.05,.75,0);
TText* pname = new TText(.46,.21,"fEventOffset");
pname->SetTextFont(72);
pname->SetTextSize(0.018);
pname->Draw();
pname->DrawText(.44,.11,"fBuffer");
pname->DrawText(.42,.01,"fZipBuffer");
pname->DrawText(.26,.84,"fLeaves = TObjArray of TLeaf");
pname->DrawText(.24,.40,"fBasketEvent");
pname->DrawText(.22,.31,"fBaskets = TObjArray of TBasket");
pname->DrawText(.20,1.0,"fBranches = TObjArray of TBranch");
TPaveText* ntleaf = new TPaveText(0.30,.42,.62,.73);
ntleaf->SetTextSize(0.014);
ntleaf->SetFillColor(leafcolor);
ntleaf->SetTextAlign(12);
ntleaf->AddText("fLen: number of fixed elements");
ntleaf->AddText("fLenType: number of bytes of data type");
ntleaf->AddText("fOffset: relative to Leaf0-fAddress");
ntleaf->AddText("fNbytesIO: number of bytes used for I/O");
ntleaf->AddText("fIsPointer: True if pointer");
ntleaf->AddText("fIsRange: True if leaf has a range");
ntleaf->AddText("fIsUnsigned: True if unsigned");
ntleaf->AddText("*fLeafCount: points to Leaf counter");
ntleaf->AddText(" ");
ntleaf->AddLine(0,0,0,0);
ntleaf->AddText("fName = Leaf name");
ntleaf->AddText("fTitle = Leaf type (see Type codes)");
ntleaf->Draw();
TPaveText* type = new TPaveText(.65,.42,.95,.73);
type->SetTextAlign(12);
type->SetFillColor(leafcolor);
type->AddText(" ");
type->AddText("C : a character string");
type->AddText("B : an 8 bit signed integer");
type->AddText("b : an 8 bit unsigned integer");
type->AddText("S : a 16 bit signed short integer");
type->AddText("s : a 16 bit unsigned short integer");
type->AddText("I : a 32 bit signed integer");
type->AddText("i : a 32 bit unsigned integer");
type->AddText("F : a 32 bit floating point");
type->AddText("f : a 24 bit truncated float");
type->AddText("D : a 64 bit floating point");
type->AddText("d : a 24 bit truncated double");
type->AddText("TXXXX : a class name TXXXX");
type->Draw();
TPaveLabel* typecode = new TPaveLabel(.7,.71,.9,.75,"fType codes");
typecode->SetFillColor(leafcolor);
typecode->Draw();
ldot->DrawLine(.4,.78,.30,.73);
ldot->DrawLine(.5,.78,.62,.73);
TPaveText* ntbasket = new TPaveText(0.02,-0.07,0.35,.25);
ntbasket->SetFillColor(basketcolor);
ntbasket->SetTextSize(0.014);
ntbasket->SetTextAlign(12);
ntbasket->AddText("fNbytes: Size of compressed Basket");
ntbasket->AddText("fObjLen: Size of uncompressed Basket");
ntbasket->AddText("fDatime: Date/Time when written to store");
ntbasket->AddText("fKeylen: Number of bytes for the key");
ntbasket->AddText("fCycle : Cycle number");
ntbasket->AddText("fSeekKey: Pointer to Basket on file");
ntbasket->AddText("fSeekPdir: Pointer to directory on file");
ntbasket->AddText("fClassName: 'TBasket'");
ntbasket->AddText("fName: Branch name");
ntbasket->AddText("fTitle: TreePave name");
ntbasket->AddText(" ");
ntbasket->AddLine(0,0,0,0);
ntbasket->AddText("fNevBuf: Number of events in Basket");
ntbasket->AddText("fLast: pointer to last used byte in Basket");
ntbasket->Draw();
ldot->DrawLine(.4,.3,0.02,0.25);
ldot->DrawLine(.5,.25,0.35,-.07);
ldot->DrawLine(.5,.3,0.35,0.25);
TPaveText* ntbranch = new TPaveText(0.02,0.40,0.18,0.68);
ntbranch->SetFillColor(branchcolor);
ntbranch->SetTextSize(0.015);
ntbranch->SetTextAlign(12);
ntbranch->AddText("fBasketSize");
ntbranch->AddText("fEventOffsetLen");
ntbranch->AddText("fMaxBaskets");
ntbranch->AddText("fEntries");
ntbranch->AddText("fAddress of Leaf0");
ntbranch->AddText(" ");
ntbranch->AddLine(0,0,0,0);
ntbranch->AddText("fName: Branchname");
ntbranch->AddText("fTitle: leaflist");
ntbranch->Draw();
ldot->DrawLine(.2,.97,.02,.68);
ldot->DrawLine(.35,.97,.18,.68);
ldot->DrawLine(.35,.87,.18,.40);
TPavesText* basketstore = new TPavesText(.8,-0.088,0.952,-0.0035,7,"tr");
basketstore->SetFillColor(28);
basketstore->AddText("Baskets");
basketstore->AddText("Stores");
basketstore->Draw();
c1->Update();

gBenchmark->Show("treePave");

Draw all canvases

In [2]:
gROOT->GetListOfCanvases()->Draw()