2.5.6 Region sample

Function region fill the area between 2 curves. It support gradient filling if 2 colors per curve is specified. Also it can fill only the region y1<y<y2 if style ‘i’ is used. The sample code is:

int sample(mglGraph *gr)
{
  mglData y;  mgls_prepare1d(&y);
  mglData y1 = y.SubData(-1,1), y2 = y.SubData(-1,2); gr->SetOrigin(0,0,0);
  gr->SubPlot(2,2,0,"");  gr->Title("Region plot (default)");
  gr->Box();  gr->Region(y1,y2);  gr->Plot(y1,"k2");  gr->Plot(y2,"k2");

  gr->SubPlot(2,2,1,"");  gr->Title("2 colors");
  gr->Box();  gr->Region(y1,y2,"yr"); gr->Plot(y1,"k2");  gr->Plot(y2,"k2");

  gr->SubPlot(2,2,2,"");  gr->Title("'!' style");
  gr->Box();  gr->Region(y1,y2,"!");  gr->Plot(y1,"k2");  gr->Plot(y2,"k2");

  gr->SubPlot(2,2,3,"");  gr->Title("'i' style");
  gr->Box();  gr->Region(y1,y2,"ir"); gr->Plot(y1,"k2");  gr->Plot(y2,"k2");
  return 0;
}

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