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local std_dev = active:get_property("std-dev").value
touch_point(centerx - dim - std_dev, centery)
mrg:listen(Mrg.DRAG, function(ev)
if ev.type == Mrg.DRAG_MOTION then
local x = active:get_property("std-dev").value
x = x - ev.delta_x
if x < 0 then x = 0 end
active:set_property("std-dev", GObject.Value(GObject.Type.DOUBLE, x))
ev:stop_propagate();
end
end)
cr:new_path()
cr:arc(centerx, centery, std_dev, 0, 3.14152 * 2)
contrasty_stroke()
cr:arc(centerx, centery, std_dev * 2, 0, 3.14152 * 2)
contrasty_stroke()
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