svgfile "sun_moon.svg";

automaton sun_moon:
  cont t der 1.0;

  location Day:
    initial;
    edge when t >= 12.0 do t := 0.0 goto Night;

  location Night:
    edge when t >= 12.0 do t := 0.0 goto Day;

  svgout id "sun" attr "visibility"
    value if Day: "visible" else "hidden" end;

  svgout id "moon" attr "visibility"
    value switch self:
      case Day:   "hidden"
      case Night: "visible"
    end;
end