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util = {
dim = function(dir)
if dir == 'x' then
return 'width'
elseif dir == 'y' then
return 'height'
else
if STRICT then error('dir '..dir) end
end
end,
dirToXY = function(dir)
if dir == 'up' or dir == 'down' then
return 'y'
elseif dir == 'left' or dir == 'right' then
return 'x'
else
error('bad direction')
end
end,
dirToPosNeg = function(dir)
if dir == 'up' or dir == 'left' then
return -1
elseif dir == 'down' or dir == 'right' then
return 1
else
error('bad direction')
end
end
}
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