IJ/macros/FloodFillTool.txt

   var floodType = call("ij.Prefs.get", "tool.flood", "8-connected");
   var alt = 8;

    macro "Flood Fill Tool -C037B21P085373b75d0L4d1aL3135L4050L6166D57D77D68D09D94Da7C123Da5La9abLb6bc" {
        setupUndo();
        getCursorLoc(x, y, z, flags);
       if (flags&alt!=0)
          setColor(getValue("color.background"));
        floodFill(x, y, floodType);
     }

  macro 'Flood Fill Tool Options...' {
      Dialog.create("Flood Fill Tool");
      Dialog.addChoice("Flood Type:", newArray("4-connected", "8-connected"), floodType);
      Dialog.show();
      floodType = Dialog.getChoice();
      call("ij.Prefs.set", "tool.flood", floodType);
  }