{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "3e7a578e",
   "metadata": {},
   "source": [
    "# hist003_TH1_draw\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Rene Brun, Giacomo Parolini  \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 08:11 PM.</small></i>"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "bdd749c8",
   "metadata": {},
   "source": [
    "Create and fill the histogram.\n",
    "See hist002_TH1_fillrandom_userfunc.C for more information about this section."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "00d2b941",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "auto *form1 = new TFormula(\"form1\", \"abs(sin(x)/x)\");\n",
    "double rangeMin = 0.0;\n",
    "double rangeMax = 10.0;\n",
    "auto *sqroot = new TF1(\"sqroot\", \"x*gaus(0) + [3]*form1\", rangeMin, rangeMax);\n",
    "sqroot->SetLineColor(4);\n",
    "sqroot->SetLineWidth(6);\n",
    "sqroot->SetParameters(10.0, 4.0, 1.0, 20.0);\n",
    "\n",
    "int nBins = 200;\n",
    "auto *h1d = new TH1D(\"h1d\", \"Test random numbers\", nBins, rangeMin, rangeMax);\n",
    "\n",
    "h1d->FillRandom(\"sqroot\", 10000);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1aed5b23",
   "metadata": {},
   "source": [
    "Create a canvas and draw the histogram"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "dc0f2608",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "int topX = 200;\n",
    "int topY = 10;\n",
    "int width = 700;\n",
    "int height = 900;\n",
    "auto *c1 = new TCanvas(\"c1\", \"The FillRandom example\", topX, topY, width, height);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ec3ec885",
   "metadata": {},
   "source": [
    "Split the canvas into two sections to plot both the function and the histogram\n",
    "The TPad's constructor accepts the relative coordinates (0 to 1) of the pad's boundaries"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2e3bdbe0",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "auto *pad1 = new TPad(\"pad1\", \"The pad with the function\", 0.05, 0.50, 0.95, 0.95);\n",
    "auto *pad2 = new TPad(\"pad2\", \"The pad with the histogram\", 0.05, 0.05, 0.95, 0.45);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1bf9c682",
   "metadata": {},
   "source": [
    "Draw the two pads"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e8dfcd9e",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad1->Draw();\n",
    "pad2->Draw();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "11dfa91a",
   "metadata": {},
   "source": [
    "Select pad1 to draw the next objects into"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "79886b3d",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad1->cd();\n",
    "pad1->SetGridx();\n",
    "pad1->SetGridy();\n",
    "pad1->GetFrame()->SetBorderMode(-1);\n",
    "pad1->GetFrame()->SetBorderSize(5);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b295a995",
   "metadata": {},
   "source": [
    "Draw the function in pad1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "1aebf1b8",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "sqroot->Draw();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b675c070",
   "metadata": {},
   "source": [
    "Add a label to the function.\n",
    "TPaveLabel's constructor accepts the pixel coordinates and the label string."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "a46c9990",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "auto *lfunction = new TPaveLabel(5, 39, 9.8, 46, \"The sqroot function\");\n",
    "lfunction->Draw();\n",
    "c1->Update();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "59866d5d",
   "metadata": {},
   "source": [
    "Select pad2 to draw the next objects into"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7726a821",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad2->cd();\n",
    "pad2->GetFrame()->SetBorderMode(-1);\n",
    "pad2->GetFrame()->SetBorderSize(5);\n",
    "\n",
    "h1d->SetFillColor(45);\n",
    "h1d->Draw();\n",
    "c1->Update();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4699ec12",
   "metadata": {},
   "source": [
    "Draw all canvases "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "fb6b8c5a",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "gROOT->GetListOfCanvases()->Draw()"
   ]
  }
 ],
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