#include <iostream>
using namespace std;
void polyLineRefresh(Int_t n=5)
{
  TCanvas *c1 = new TCanvas("c1","PolyLine3D",200,20,700,700);

  TPad *p1 = new TPad("p1","p1",0.1,0.1,0.9,0.9,0,4,1);

   //http://root.cern.ch/root/html/TView.html#TView:CreateView
   TView *view = TView::CreateView(1);
   //view = TView::CreateView(1);
   view->SetRange(-48,-48,-48,48,48,48);
   view->RotateView(90.0,0.0);


   TPolyLine3D *test = new TPolyLine3D(n);
   int col=1;
   test->SetLineColor(col);

   float r=10.0,x,y,z=0,theta;
   theta=0.0;
   string input;

   for(int i=0;i<n+1;i++){
      //cout << theta << endl;
      x=r*cos(theta); y=r*sin(theta); test->SetPoint(i,x,y,z);
      theta += 3.14159*2/n;  

      test->Draw();
      c1->Update();
      //input=Getline("type <i> increment color: ");
      cout << "type <i> and then <return> to increment color: ";
      cin >> input;
      if(input=="i"){
         col++;
	 test->SetLineColor(col);
      }
   }

}