#include "TCanvas.h"
#include "TView.h"
#include "TPad.h"
#include "TH1D.h"
#include "TPolyLine3D.h"


void easy2()
{
	// create two diffrent objects to be displayed - a polyline and a histogram
	double x[6] = {-14.37, 14.37, +25.53,     0., -25.53, -14.37};
	double y[6] = {-11.11, -11.11,     0., +25.53,     0., -11.11};
	double z[6] = {0, 0, 0, 0, 0, 0};
	TPolyLine3D *det1 = new TPolyLine3D(6, z, x, y);

	TH1D* det2 = new TH1D("det1", "det1", 100, 0, 1);

	// create a canvas with pads
	TCanvas *c = new TCanvas();
	c->Divide(2, 2);

	// 1. user decides to display the polyline in pad 3
	c->cd(3);
	TView *view;
	view = TView::CreateView(1, 0, 0);
	view->SetRange(-10, -35, -21, 50, 35, 35);
	view->SetPerspective();
	det1->Draw();

	// 2. user changes his mind and displays the histogram in pad3
	c->Clear("d"); // to clear the contents of pads
	c->cd(3);
	det2->Draw();

	// 3. users again decides to display the polyline
	c->Clear("d");
	c->cd(3);
	det1->Draw(); // here we get the problem

	printf("OK, finishing\n");
}