#include "TStyle.h"
#include "TColor.h"
#include "TF2.h"
#include "TExec.h"
#include "TCanvas.h"

void Pal1() {
    gStyle->SetPalette(106, 0, 0.5);
}

void Pal2() {
    gStyle->SetPalette(75, 0, 0.5);
}

void multi() {
   TCanvas *c  = new TCanvas("c","c",0,0,1000,800);

   TF2 *f1 = new TF2("f1","0.1+(1-(x-2)*(x-2))*(1-(y-2)*(y-2))",1,3,1,3);
   TF2 *f2 = new TF2("f2","0.1+(2-(x-3)*(x-3))*(2-(y-3)*(y-3))",2,4,2,4);
 
   f1->SetLineWidth(1);
   f1->SetLineColor(kBlue);
   f2->SetLineWidth(1);
   f2->SetLineColor(kBlack);

   f1->Draw("surf2");
   TExec *ex1 = new TExec("ex1","Pal1();");
   ex1->Draw();
   f1->Draw("surf2 same");

   f2->Draw("surf2 same");
   TExec *ex2 = new TExec("ex2","Pal2();");
   ex2->Draw();
   f2->Draw("surf2 same");
}