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-- Invert all cell states in the current selection.
-- Author: Andrew Trevorrow (andrew@trevorrow.com), Mar 2016.
local g = golly()
local gp = require "gplus"
-- re-assigning inner loop functions results in a 10% speed up
local setcell = g.setcell
local getcell = g.getcell
local r = gp.rect(g.getselrect())
if r.empty then g.exit("There is no selection.") end
-- local t1 = os.clock()
local oldsecs = os.clock()
local maxstate = g.numstates() - 1
for row = r.top, r.bottom do
-- if large selection then give some indication of progress
local newsecs = os.clock()
if newsecs - oldsecs >= 1.0 then
oldsecs = newsecs
g.update()
end
for col = r.left, r.right do
setcell(col, row, maxstate - getcell(col, row))
end
end
if not r.visible() then g.fitsel() end
-- g.show(""..(os.clock()-t1))
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