// test.C

TGraph *tg=0;

void scan(bool rescan)
{
	if(rescan) {
		tg->Set(10); // mimicing what my much larger macro does
		tg->SetPoint(0,0.0,1.0);
		tg->SetPoint(1,1.0,1.0);
		tg->SetPoint(2,1.0,0.0);
		tg->SetPoint(3,-1.0,1.0);
		tg->SetPoint(4,0.0,-1.0);
		tg->Set(5); // mimicing what my much larger macro does
		tg->Draw("ALP");
	} else {
		tg->Set(10); // mimicing what my much larger macro does
		tg->SetPoint(0,0.0,1.0);
		tg->SetPoint(1,1.0,2.0);
		tg->SetPoint(2,2.0,3.0);
		tg->SetPoint(3,3.0,4.0);
		tg->SetPoint(4,4.0,5.0);
		tg->Set(5); // mimicing what my much larger macro does
	}
}

void test()
{
	gEnv->SetValue("Canvas.ShowEditor",1);

	tg = new TGraph(2); // 2 is # points (changed in scan())
	scan(false);
	tg->Draw("ALP");
	c1->Selected(c1,c1->FindObject(tg),1);
}