{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "d711e30d",
   "metadata": {},
   "source": [
    "# hist016_TH1_different_scales_canvas\n",
    "The second histogram is drawn in a transparent pad\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Rene Brun  \n",
    "<i><small>This notebook tutorial was automatically generated with <a href= \"https://github.com/root-project/root/blob/master/documentation/doxygen/converttonotebook.py\">ROOTBOOK-izer</a> from the macro found in the ROOT repository  on Tuesday, May 19, 2026 at 08:12 PM.</small></i>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8d3ba6c1",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "TCanvas *c1 = new TCanvas(\"c1\", \"transparent pad\", 200, 10, 700, 500);\n",
    "TPad *pad1 = new TPad(\"pad1\", \"\", 0, 0, 1, 1);\n",
    "TPad *pad2 = new TPad(\"pad2\", \"\", 0, 0, 1, 1);\n",
    "pad2->SetFillStyle(4000); // will be transparent\n",
    "pad1->Draw();\n",
    "pad1->cd();\n",
    "\n",
    "TH1F *h1 = new TH1F(\"h1\", \"h1\", 100, -3, 3);\n",
    "TH1F *h2 = new TH1F(\"h2\", \"h2\", 100, -3, 3);\n",
    "TRandom r;\n",
    "for (Int_t i = 0; i < 100000; i++) {\n",
    "   Double_t x1 = r.Gaus(-1, 0.5);\n",
    "   Double_t x2 = r.Gaus(1, 1.5);\n",
    "   if (i < 1000)\n",
    "      h1->Fill(x1);\n",
    "   h2->Fill(x2);\n",
    "}\n",
    "h1->Draw();\n",
    "pad1->Update(); // this will force the generation of the \"stats\" box\n",
    "TPaveStats *ps1 = (TPaveStats *)h1->GetListOfFunctions()->FindObject(\"stats\");\n",
    "ps1->SetX1NDC(0.4);\n",
    "ps1->SetX2NDC(0.6);\n",
    "pad1->Modified();\n",
    "c1->cd();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4e019779",
   "metadata": {},
   "source": [
    "compute the pad range with suitable margins"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c9c1d007",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "Double_t ymin = 0;\n",
    "Double_t ymax = 2000;\n",
    "Double_t dy = (ymax - ymin) / 0.8; // 10 per cent margins top and bottom\n",
    "Double_t xmin = -3;\n",
    "Double_t xmax = 3;\n",
    "Double_t dx = (xmax - xmin) / 0.8; // 10 per cent margins left and right\n",
    "pad2->Range(xmin - 0.1 * dx, ymin - 0.1 * dy, xmax + 0.1 * dx, ymax + 0.1 * dy);\n",
    "pad2->Draw();\n",
    "pad2->cd();\n",
    "h2->SetLineColor(kRed);\n",
    "h2->Draw(\"][sames\");\n",
    "pad2->Update();\n",
    "TPaveStats *ps2 = (TPaveStats *)h2->GetListOfFunctions()->FindObject(\"stats\");\n",
    "ps2->SetX1NDC(0.65);\n",
    "ps2->SetX2NDC(0.85);\n",
    "ps2->SetTextColor(kRed);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "481d1756",
   "metadata": {},
   "source": [
    "draw axis on the right side of the pad"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5466443b",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "TGaxis *axis = new TGaxis(xmax, ymin, xmax, ymax, ymin, ymax, 50510, \"+L\");\n",
    "axis->SetLabelColor(kRed);\n",
    "axis->Draw();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fc77d238",
   "metadata": {},
   "source": [
    "Draw all canvases "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f1cb8459",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "gROOT->GetListOfCanvases()->Draw()"
   ]
  }
 ],
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