blob: 452e6d5508521df36ab2765012563647d03512a9 (
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local M = {}
function M.copy(t)
local c = {}
for k,v in pairs(t) do
c[k] = v
end
return c
end
function M.deepcopy(t)
local copied = {}
local function dc(t)
if not copied[t] then
local c = {}
copied[t] = c
for k,v in pairs(t) do
if type(v) == 'table' then
v = dc(v)
end
c[k] = v
end
end
return copied[t]
end
return dc(t)
end
function M.rot(a, x, y)
return x*math.cos(a) - y*math.sin(a), x*math.sin(a) + y*math.cos(a)
end
function M.magnitude(v)
local s = 0
for _, a in ipairs(v) do
s = s + a*a
end
return math.sqrt(s)
end
return M
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