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"source": [
"# surfaces\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Rene Brun \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:37 PM."
]
},
{
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"id": "19bbd8c0",
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"TCanvas *c1 = new TCanvas(\"c1\", \"Surfaces Drawing Options\", 200, 10, 700, 900);\n",
"TPaveText *title = new TPaveText(.2, 0.96, .8, .995);\n",
"title->AddText(\"Examples of Surface options\");\n",
"title->Draw();\n",
"\n",
"TPad *pad1 = new TPad(\"pad1\", \"Gouraud shading\", 0.03, 0.50, 0.98, 0.95);\n",
"TPad *pad2 = new TPad(\"pad2\", \"Color mesh\", 0.03, 0.02, 0.98, 0.48);\n",
"pad1->Draw();\n",
"pad2->Draw();"
]
},
{
"cell_type": "markdown",
"id": "0d128b1e",
"metadata": {},
"source": [
"We generate a 2-D function"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "c00f044c",
"metadata": {
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"execution": {
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"shell.execute_reply": "2026-05-19T20:37:30.862712Z"
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"source": [
"TF2 *f2 = new TF2(\"f2\", \"x**2 + y**2 - x**3 -8*x*y**4\", -1, 1.2, -1.5, 1.5);\n",
"f2->SetContour(48);\n",
"f2->SetFillColor(45);"
]
},
{
"cell_type": "markdown",
"id": "162d534b",
"metadata": {},
"source": [
"Draw this function in pad1 with Gouraud shading option"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "f5be1381",
"metadata": {
"collapsed": false,
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"shell.execute_reply": "2026-05-19T20:37:31.074772Z"
}
},
"outputs": [],
"source": [
"pad1->cd();\n",
"pad1->SetPhi(-80);\n",
"pad1->SetLogz();\n",
"f2->Draw(\"surf4\");"
]
},
{
"cell_type": "markdown",
"id": "009779f1",
"metadata": {},
"source": [
"Draw this function in pad2 with color mesh option"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "2365c6ee",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:37:31.290708Z"
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"outputs": [],
"source": [
"pad2->cd();\n",
"pad2->SetTheta(25);\n",
"pad2->SetPhi(-110);\n",
"pad2->SetLogz();\n",
"f2->SetLineWidth(1);\n",
"f2->SetLineColor(5);\n",
"f2->Draw(\"surf1\");"
]
},
{
"cell_type": "markdown",
"id": "c757d299",
"metadata": {},
"source": [
"add axis titles. The titles are set on the intermediate\n",
"histogram used for visualisation. We must force this histogram\n",
"to be created, then force the redrawing of the two pads"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "c401f439",
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"shell.execute_reply": "2026-05-19T20:37:31.685146Z"
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"pad2->Update();\n",
"f2->GetHistogram()->GetXaxis()->SetTitle(\"x title\");\n",
"f2->GetHistogram()->GetYaxis()->SetTitle(\"y title\");\n",
"f2->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);\n",
"f2->GetHistogram()->GetYaxis()->SetTitleOffset(1.4);\n",
"pad1->Modified();\n",
"pad2->Modified();"
]
},
{
"cell_type": "markdown",
"id": "ebd63342",
"metadata": {},
"source": [
"Draw all canvases "
]
},
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"source": [
"gROOT->GetListOfCanvases()->Draw()"
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