3.5.5 Area sample

Function area fill the area between curve and axis plane. It support gradient filling if 2 colors per curve is specified. The sample code is:

int sample(mglGraph *gr)
{
  mglData y;  mgls_prepare1d(&y); gr->SetOrigin(0,0,0);
  gr->SubPlot(2,2,0,"");  gr->Title("Area plot (default)");
  gr->Box();  gr->Area(y);

  gr->SubPlot(2,2,1,"");  gr->Title("2 colors");
  gr->Box();  gr->Area(y,"cbgGyr");

  gr->SubPlot(2,2,2,"");  gr->Title("'!' style");
  gr->Box();  gr->Area(y,"!");

  gr->SubPlot(2,2,3); gr->Title("3d variant");
  gr->Rotate(50,60);  gr->Box();
  mglData yc(30), xc(30), z(30);  z.Modify("2*x-1");
  yc.Modify("sin(pi*(2*x-1))"); xc.Modify("cos(pi*2*x-pi)");
  gr->Area(xc,yc,z,"r");
  yc.Modify("-sin(pi*(2*x-1))");  gr->Area(xc,yc,z,"b#");
  return 0;
}