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Add more checks to vector functions

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ShadowNinja 2013-10-30 15:38:13 -04:00
parent 1cbba877ff
commit fba2650e39
1 changed files with 25 additions and 14 deletions
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39
builtin/vector.lua
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@ -1,41 +1,46 @@
vector = {} vector = {}
local function assert_vector(v)
assert(type(v) == "table" and v.x and v.y and v.z, "Invalid vector")
end
function vector.new(a, b, c) function vector.new(a, b, c)
assert(a)
if type(a) == "table" then if type(a) == "table" then
assert(a.x and a.y and a.z, "Invalid vector passed to vector.new()")
return {x=a.x, y=a.y, z=a.z} return {x=a.x, y=a.y, z=a.z}
else elseif a then
assert(b and c) assert(b and c, "Invalid arguments for vector.new()")
return {x=a, y=b, z=c} return {x=a, y=b, z=c}
end end
return {x=0, y=0, z=0} return {x=0, y=0, z=0}
end end
function vector.equals(a, b) function vector.equals(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
return a.x == b.x and return a.x == b.x and
a.y == b.y and a.y == b.y and
a.z == b.z a.z == b.z
end end
function vector.length(v) function vector.length(v)
assert(v) assert_vector(v)
return math.hypot(v.x, math.hypot(v.y, v.z)) return math.hypot(v.x, math.hypot(v.y, v.z))
end end
function vector.normalize(v) function vector.normalize(v)
assert(v) assert_vector(v)
local len = vector.length(v) local len = vector.length(v)
if len == 0 then if len == 0 then
return vector.new() return {x=0, y=0, z=0}
else else
return vector.divide(v, len) return vector.divide(v, len)
end end
end end
function vector.round(v) function vector.round(v)
assert(v) assert_vector(v)
return { return {
x = math.floor(v.x + 0.5), x = math.floor(v.x + 0.5),
y = math.floor(v.y + 0.5), y = math.floor(v.y + 0.5),
@ -44,7 +49,8 @@ function vector.round(v)
end end
function vector.distance(a, b) function vector.distance(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
local x = a.x - b.x local x = a.x - b.x
local y = a.y - b.y local y = a.y - b.y
local z = a.z - b.z local z = a.z - b.z
@ -52,7 +58,8 @@ function vector.distance(a, b)
end end
function vector.direction(pos1, pos2) function vector.direction(pos1, pos2)
assert(pos1 and pos2) assert_vector(pos1)
assert_vector(pos2)
local x_raw = pos2.x - pos1.x local x_raw = pos2.x - pos1.x
local y_raw = pos2.y - pos1.y local y_raw = pos2.y - pos1.y
local z_raw = pos2.z - pos1.z local z_raw = pos2.z - pos1.z
@ -82,7 +89,8 @@ end
function vector.add(a, b) function vector.add(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
if type(b) == "table" then if type(b) == "table" then
return {x = a.x + b.x, return {x = a.x + b.x,
y = a.y + b.y, y = a.y + b.y,
@ -95,7 +103,8 @@ function vector.add(a, b)
end end
function vector.subtract(a, b) function vector.subtract(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
if type(b) == "table" then if type(b) == "table" then
return {x = a.x - b.x, return {x = a.x - b.x,
y = a.y - b.y, y = a.y - b.y,
@ -108,7 +117,8 @@ function vector.subtract(a, b)
end end
function vector.multiply(a, b) function vector.multiply(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
if type(b) == "table" then if type(b) == "table" then
return {x = a.x * b.x, return {x = a.x * b.x,
y = a.y * b.y, y = a.y * b.y,
@ -121,7 +131,8 @@ function vector.multiply(a, b)
end end
function vector.divide(a, b) function vector.divide(a, b)
assert(a and b) assert_vector(a)
assert_vector(b)
if type(b) == "table" then if type(b) == "table" then
return {x = a.x / b.x, return {x = a.x / b.x,
y = a.y / b.y, y = a.y / b.y,