#include "axis.h"
#include "TCanvas.h"
#include "TStyle.h"
#include "TH1.h"
#include "TRandom.h"
#include "TGaxis.h"
#include "TExec.h"


//TGaxis* axis = nullptr;
/*
void draw_axis()
{
	axis = new TGaxis(gPad->GetUxmax(), gPad->GetUymin(),
		gPad->GetUxmax(), gPad->GetUymax(), 0, 11000, 510, "+L");
	axis->SetLineColor(kRed);
	axis->SetLabelColor(kRed);
	//axis->Draw();
}
*/

void twoscales()
{
	TCanvas* c1 = new TCanvas("c1", "hists with different scales", 600, 400);

	// creat/fill draw h1
	gStyle->SetOptStat(kFALSE);
	TH1F* h1 = new TH1F("h1", "my histogram", 100, -3, 3);
	for (int i = 0; i < 10000; ++i)
		h1->Fill(gRandom->Gaus(0, 1));
	h1->Draw();
	c1->Update();

	// creat hint1 filled with the bins integral of h1
	TH1F* hint1 = new TH1F("hint1", "h1 bins integral", 100, -3, 3);
	Float_t sum = 0;
	for (int i = 1; i <= 100; i++)
	{
		sum += h1->GetBinContent(i);
		hint1->SetBinContent(i, sum);
	}

	// scale hint1 to the pad coordinates
	Float_t rightmax = 1.1 * hint1->GetMaximum();
	Float_t scale = gPad->GetUymax() / rightmax;
	hint1->SetLineColor(kRed);
	hint1->Scale(scale);
	hint1->Draw("same");
//	axis = new TGaxis();
//	TExec* draw_axis = new TExec("draw_axis", "draw_axis()");
//	draw_axis->Draw();
	c1->Update();

	// draw an axis on the right side
	TGaxis* axis = new TGaxis(gPad->GetUxmax(), gPad->GetUymin(), 
		gPad->GetUxmax(), gPad->GetUymax(), 0, rightmax, 510, "+L");
	axis->SetLineColor(kRed);
	axis->SetLabelColor(kRed);
	axis->Draw();
	c1->Update();
}