#include "TCanvas.h"
#include "TH1.h"
#include "TGraph.h"
#include "TAxis.h"
#include "TGaxis.h"

//This program reads data from the table2.txt file and plot the fourth and sixth colomn as x and y


void ReverseYAxis (TGraph *g);

void Astro () {

    //TGraph *g = new TGraph("/Users/kumakenkoji/Desktop/table3.txt", "%*s %*s %*s %lg %*s %lg");

    // Fake graph because I do not have /Users/kumakenkoji/Desktop/table3.txt
    TGraph *g = new TGraph();
    g->SetPoint(1,2.,3.);
    g->SetPoint(2,20.,30.);
    g->SetPoint(3,200.,300.);

    TCanvas *c1 = new TCanvas ("c1", "canvas1", 200,10,600,400);


    g->GetYaxis()->SetTitle("V mag");
    g->GetXaxis()->SetTitle("B-V");

    g-> Draw("A*");
    ReverseYAxis(g);

}

// reverse Yaxis

void ReverseYAxis (TGraph *g)
{

    //Remove the current axis
    g->GetYaxis()->SetLabelOffset(999);
    g->GetYaxis()->SetTickLength(0);


     //Redraw the new axis
    gPad->Update();
    TGaxis *newaxis = new TGaxis(gPad->GetUxmin(),
                                 gPad->GetUymax(),
                                 gPad->GetUxmin()-0.001,
                                 gPad->GetUymin(),
                                 g->GetYaxis()->GetXmin(),
                                 g->GetYaxis()->GetXmax(),
                                 510,"+");
    newaxis->SetLabelOffset(-0.03);
    newaxis->Draw();

}