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"source": [
"# hist026_THStack_color_scheme\n",
"In this example, the color scheme with six colors is used.\n",
"It also shows that the grayscale version is an acceptable alternative.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Olivier Couet \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:12 PM."
]
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"outputs": [],
"source": [
"auto c1 = new TCanvas();\n",
"auto hs = new THStack(\"hs\", \"Stacked 1D histograms colored using 6-colors scheme\");"
]
},
{
"cell_type": "markdown",
"id": "a50c5065",
"metadata": {},
"source": [
"Create six 1-d histograms and add them in the stack"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "815502d7",
"metadata": {
"collapsed": false,
"execution": {
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"source": [
"auto h1st = new TH1F(\"h1st\", \"A\", 100, -4, 4);\n",
"h1st->FillRandom(\"gaus\", 20000);\n",
"h1st->SetFillColor(kP6Blue);\n",
"hs->Add(h1st);\n",
"\n",
"auto h2st = new TH1F(\"h2st\", \"B\", 100, -4, 4);\n",
"h2st->FillRandom(\"gaus\", 15000);\n",
"h2st->SetFillColor(kP6Yellow);\n",
"hs->Add(h2st);\n",
"\n",
"auto h3st = new TH1F(\"h3st\", \"C\", 100, -4, 4);\n",
"h3st->FillRandom(\"gaus\", 10000);\n",
"h3st->SetFillColor(kP6Red);\n",
"hs->Add(h3st);\n",
"\n",
"auto h4st = new TH1F(\"h4st\", \"D\", 100, -4, 4);\n",
"h4st->FillRandom(\"gaus\", 10000);\n",
"h4st->SetFillColor(kP6Grape);\n",
"hs->Add(h4st);\n",
"\n",
"auto h5st = new TH1F(\"h5st\", \"E\", 100, -4, 4);\n",
"h5st->FillRandom(\"gaus\", 10000);\n",
"h5st->SetFillColor(kP6Gray);\n",
"hs->Add(h5st);\n",
"\n",
"auto h6st = new TH1F(\"h6st\", \"F\", 100, -4, 4);\n",
"h6st->FillRandom(\"gaus\", 10000);\n",
"h6st->SetFillColor(kP6Violet);\n",
"hs->Add(h6st);"
]
},
{
"cell_type": "markdown",
"id": "c6aef18c",
"metadata": {},
"source": [
"draw the stack with colors"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "4b2d26bc",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:12:33.132618Z"
}
},
"outputs": [],
"source": [
"hs->Draw();\n",
"TLegend *l = gPad->BuildLegend(.8, .55, 1., .9, \"\", \"F\");\n",
"l->SetLineWidth(0);\n",
"l->SetFillStyle(0);"
]
},
{
"cell_type": "markdown",
"id": "59a527a5",
"metadata": {},
"source": [
"draw the stack using gray-scale"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "677fddb8",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:12:33.145395Z",
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"shell.execute_reply": "2026-05-19T20:12:33.348717Z"
}
},
"outputs": [],
"source": [
"auto c2 = new TCanvas();\n",
"c2->SetGrayscale();\n",
"hs->Draw();\n",
"l->Draw();"
]
},
{
"cell_type": "markdown",
"id": "00da9c16",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "d4604b75",
"metadata": {
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