1 --[[ builtin/vector.lua ]]--
3 local function wrap(op, body_wrapper, ...)
4 return loadstring("return function(a, b) " .. body_wrapper(op, ...) .. "end")()
7 local function arith_mt(...)
9 __add = wrap("+", ...),
10 __sub = wrap("-", ...),
11 __mul = wrap("*", ...),
12 __div = wrap("/", ...),
13 __mod = wrap("%", ...),
19 local mt_vec2 = arith_mt(function(op)
21 if type(b) == "number" then
22 return vec2(a.x ]] .. op.. [[ b, a.y ]] .. op .. [[ b)
24 return vec2(a.x ]] .. op.. [[ b.x, a.y ]] .. op.. [[ b.y)
29 function mt_vec2:__neg()
30 return vec2(-self.x, -self.y)
33 function mt_vec2:__len()
34 return math.sqrt(self.x ^ 2 + self.y ^ 2)
37 function mt_vec2:__tostring()
38 return "(" .. self.x .. ", " .. self.y .. ")"
42 validate = function(self)
43 assert(type(self.x) == "number")
44 assert(type(self.y) == "number")
52 if type(a) == "number" then
60 setmetatable(o, mt_vec2)
66 local mt_vec3 = arith_mt(function(op)
68 if type(b) == "number" then
69 return vec3(a.x ]] .. op.. [[ b, a.y ]] .. op .. [[ b, a.z ]] .. op .. [[ b)
71 return vec3(a.x ]] .. op.. [[ b.x, a.y ]] .. op.. [[ b.y, a.z ]] .. op.. [[ b.z)
76 function mt_vec3:__neg()
77 return vec3(-self.x, -self.y, -self.z)
80 function mt_vec3:__len()
81 return math.sqrt(self.x ^ 2 + self.y ^ 2 + self.z ^ 2)
84 function mt_vec3:__tostring()
85 return "(" .. self.x .. ", " .. self.y .. ", " .. self.z .. ")"
89 validate = function(self)
90 assert(type(self.x) == "number")
91 assert(type(self.y) == "number")
92 assert(type(self.z) == "number")
97 function vec3(a, b, c)
100 if type(a) == "number" then
110 setmetatable(o, mt_vec3)
116 local mt_box = arith_mt(function(op)
117 return "return box(a.min " .. op .. " b, a.max " .. op .. " b)"
120 function mt_box:__neg()
121 return box(-self.min, -self.max)
124 function mt_box:__tostring()
125 return "[" .. self.min .. "; " .. self.max .. "]"
129 contains = function(a, b)
130 if type(b) == "number" or b.x then
131 return a.min <= b and a.max >= b
133 return a.min <= b.min and a.max >= b.max
136 validate = function(self)
137 if type(self.min) == "number" then
138 assert(type(self.max) == "number")
140 assert(not self.min.z == not self.max.z)
150 if type(a) == "number" or a.x then
158 setmetatable(o, mt_box)