37 lines
539 B
Lua
37 lines
539 B
Lua
local m = {}
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local function rext(a, i)
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i = i - 1
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local v = a[i]
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if v then
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return i, v
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end
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end
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function m.ipairs_rev(a)
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return rext, a, (#a + 1)
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end
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function m.between(x, a, b)
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return a <= x and x <= b
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end
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function m.inside(px, py, x, y, w, h)
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return m.between(px, x, x+w) and
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m.between(py, y, y+h)
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end
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function m.add_entity(a, x)
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table.insert(a, x)
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x.idx = #a
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end
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function m.del_entity(a, x)
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table.remove(a, x)
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for i, v in ipairs(a) do
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v.idx = i
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end
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end
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return m
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