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symlog.cxx File Reference

Detailed Description

This ROOT 7 example shows how to use symlog scale on RAxis See discussion on forum https://root-forum.cern.ch/t/symlog-scale-for-plotting/ for more details.

/*************************************************************************
* Copyright (C) 1995-2021, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#include "ROOT/RCanvas.hxx"
#include "ROOT/RFrameTitle.hxx"
#include "ROOT/RFrame.hxx"
#include "ROOT/RMarker.hxx"
using namespace ROOT::Experimental;
auto symlog_style = RStyle::Parse("frame { margins_left: 0.1; }"
"title { margin: 0.01; height: 0.1; }"
"marker { onframe: true; clipping: true; }"
".group1 { marker_style: 8; marker_color: blue; }"
".group2 { marker_style: 8; marker_color: orange; }");
void symlog()
{
// Create a canvas to be displayed.
auto canvas = RCanvas::Create("Drawing with symlog");
auto pads = canvas->Divide(1, 3);
// first pad with linear scales
auto frame1 = pads[0][0]->AddFrame();
frame1->drawAxes = true;
frame1->x.min = -40;
frame1->x.max = 1040;
frame1->x.title = "x linear";
frame1->x.title.SetCenter();
frame1->y.log = 10.;
frame1->y.min = 1;
frame1->y.max = 1e4;
frame1->y.title = "y log";
frame1->y.title.SetCenter();
pads[0][0]->Draw<RFrameTitle>("linear scale");
// second pad with log scales, negative values missing
auto frame2 = pads[0][1]->AddFrame();
frame2->drawAxes = true;
frame2->x.log = 10.;
frame2->x.min = 0.05;
frame2->x.max = 1.2e3;
frame2->x.title = "x log";
frame2->x.title.SetCenter();
frame2->y.log = 10.;
frame2->y.min = 1;
frame2->y.max = 1e4;
frame2->y.title = "y log";
frame2->y.title.SetCenter();
pads[0][1]->Draw<RFrameTitle>("log scale, missing points");
// third pad with symlog scales
auto frame3 = pads[0][2]->AddFrame();
frame3->drawAxes = true;
// configure symlog scale with 10 for linear range, rest will be logarithmic, including negative
frame3->x.symlog = 10.; // boundary inside which linear scale will be used
frame3->x.min = -10;
frame3->x.max = 1.2e3;
frame3->x.title = "x symlog";
frame3->x.title.SetCenter();
frame3->y.log = 10.;
frame3->y.min = 1;
frame3->y.max = 1e4;
frame3->y.title = "y log";
frame3->y.title.SetCenter();
pads[0][2]->Draw<RFrameTitle>("symlog scale");
for (int n=0;n<100;n++) {
auto x1 = TMath::Power(10, gRandom->Uniform(1, 2.9));
auto y1 = TMath::Power(10, gRandom->Uniform(1, 1.9));
if (n % 27 == 0) { x1 = 100; y1 *= 100; }
RPadPos pm{RPadLength::User(x1), RPadLength::User(y1)};
pads[0][0]->Draw<RMarker>(pm)->SetCssClass("group1");
pads[0][1]->Draw<RMarker>(pm)->SetCssClass("group1");
pads[0][2]->Draw<RMarker>(pm)->SetCssClass("group1");
}
for (int n=0;n<75;n++) {
auto x2 = gRandom->Uniform(-5., 5.);
auto y2 = TMath::Power(10, gRandom->Uniform(2.2, 3.7));
RPadPos pm{RPadLength::User(x2), RPadLength::User(y2)};
pads[0][0]->Draw<RMarker>(pm)->SetCssClass("group2");
pads[0][1]->Draw<RMarker>(pm)->SetCssClass("group2");
pads[0][2]->Draw<RMarker>(pm)->SetCssClass("group2");
}
canvas->UseStyle(symlog_style);
canvas->SetSize(500, 900);
canvas->Show();
}
static const double x2[5]
static const double x1[5]
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
virtual Double_t Uniform(Double_t x1=1)
Returns a uniform deviate on the interval (0, x1).
Definition: TRandom.cxx:672
const Int_t n
Definition: legend1.C:16
RModel Parse(std::string filename)
Parser function for translatng Keras .h5 model into a RModel object.
LongDouble_t Power(LongDouble_t x, LongDouble_t y)
Definition: TMath.h:685
Date
2021-05-26
Warning
This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
Author
Sergey Linev s.lin.nosp@m.ev@g.nosp@m.si.de

Definition in file symlog.cxx.