class A
{
	private:
	TGraph *pG[10];
	int     iG;
	TMultiGraph *pMG;
	TCanvas *c1;
		
	public:
	A();
	void d1(double shift);
};

A::A()
{
	c1 = new TCanvas();
	c1->SetFillColor(10);
	pMG = new TMultiGraph();
	iG  = 0;
}

void A::d1(double shift)
{
   if(iG == 10) return;
   
	double x[10],y[10];
	int i;
	for(i = 0; i < 10; ++i)
	{
	   x[i] = (double)i;
	   y[i] = x[i] + shift;
	}
	pG[iG] = new TGraph(10,x,y);
	pG[iG]->SetFillColor(iG);
	pMG->Add(pG[iG],"L");
	pMG->Draw("A");
	iG++;
	c1->Update();
}