forked from Mirrorlandia_minetest/minetest
442 lines
16 KiB
Lua
442 lines
16 KiB
Lua
_G.vector = {}
|
|
dofile("builtin/common/vector.lua")
|
|
|
|
describe("vector", function()
|
|
describe("new()", function()
|
|
it("constructs", function()
|
|
assert.same({x = 0, y = 0, z = 0}, vector.new())
|
|
assert.same({x = 1, y = 2, z = 3}, vector.new(1, 2, 3))
|
|
assert.same({x = 3, y = 2, z = 1}, vector.new({x = 3, y = 2, z = 1}))
|
|
|
|
assert.is_true(vector.check(vector.new()))
|
|
assert.is_true(vector.check(vector.new(1, 2, 3)))
|
|
assert.is_true(vector.check(vector.new({x = 3, y = 2, z = 1})))
|
|
|
|
local input = vector.new({ x = 3, y = 2, z = 1 })
|
|
local output = vector.new(input)
|
|
assert.same(input, output)
|
|
assert.equal(input, output)
|
|
assert.is_false(rawequal(input, output))
|
|
assert.equal(input, input:new())
|
|
end)
|
|
|
|
it("throws on invalid input", function()
|
|
assert.has.errors(function()
|
|
vector.new({ x = 3 })
|
|
end)
|
|
|
|
assert.has.errors(function()
|
|
vector.new({ d = 3 })
|
|
end)
|
|
end)
|
|
end)
|
|
|
|
it("indexes", function()
|
|
local some_vector = vector.new(24, 42, 13)
|
|
assert.equal(24, some_vector[1])
|
|
assert.equal(24, some_vector.x)
|
|
assert.equal(42, some_vector[2])
|
|
assert.equal(42, some_vector.y)
|
|
assert.equal(13, some_vector[3])
|
|
assert.equal(13, some_vector.z)
|
|
|
|
some_vector[1] = 100
|
|
assert.equal(100, some_vector.x)
|
|
some_vector.x = 101
|
|
assert.equal(101, some_vector[1])
|
|
|
|
some_vector[2] = 100
|
|
assert.equal(100, some_vector.y)
|
|
some_vector.y = 102
|
|
assert.equal(102, some_vector[2])
|
|
|
|
some_vector[3] = 100
|
|
assert.equal(100, some_vector.z)
|
|
some_vector.z = 103
|
|
assert.equal(103, some_vector[3])
|
|
end)
|
|
|
|
it("direction()", function()
|
|
local a = vector.new(1, 0, 0)
|
|
local b = vector.new(1, 42, 0)
|
|
assert.equal(vector.new(0, 1, 0), vector.direction(a, b))
|
|
assert.equal(vector.new(0, 1, 0), a:direction(b))
|
|
end)
|
|
|
|
it("distance()", function()
|
|
local a = vector.new(1, 0, 0)
|
|
local b = vector.new(3, 42, 9)
|
|
assert.is_true(math.abs(43 - vector.distance(a, b)) < 1.0e-12)
|
|
assert.is_true(math.abs(43 - a:distance(b)) < 1.0e-12)
|
|
assert.equal(0, vector.distance(a, a))
|
|
assert.equal(0, b:distance(b))
|
|
end)
|
|
|
|
it("length()", function()
|
|
local a = vector.new(0, 0, -23)
|
|
assert.equal(0, vector.length(vector.new()))
|
|
assert.equal(23, vector.length(a))
|
|
assert.equal(23, a:length())
|
|
end)
|
|
|
|
it("normalize()", function()
|
|
local a = vector.new(0, 0, -23)
|
|
assert.equal(vector.new(0, 0, -1), vector.normalize(a))
|
|
assert.equal(vector.new(0, 0, -1), a:normalize())
|
|
assert.equal(vector.new(), vector.normalize(vector.new()))
|
|
end)
|
|
|
|
it("floor()", function()
|
|
local a = vector.new(0.1, 0.9, -0.5)
|
|
assert.equal(vector.new(0, 0, -1), vector.floor(a))
|
|
assert.equal(vector.new(0, 0, -1), a:floor())
|
|
end)
|
|
|
|
it("round()", function()
|
|
local a = vector.new(0.1, 0.9, -0.5)
|
|
assert.equal(vector.new(0, 1, -1), vector.round(a))
|
|
assert.equal(vector.new(0, 1, -1), a:round())
|
|
end)
|
|
|
|
it("apply()", function()
|
|
local i = 0
|
|
local f = function(x)
|
|
i = i + 1
|
|
return x + i
|
|
end
|
|
local a = vector.new(0.1, 0.9, -0.5)
|
|
assert.equal(vector.new(1, 1, 0), vector.apply(a, math.ceil))
|
|
assert.equal(vector.new(1, 1, 0), a:apply(math.ceil))
|
|
assert.equal(vector.new(0.1, 0.9, 0.5), vector.apply(a, math.abs))
|
|
assert.equal(vector.new(0.1, 0.9, 0.5), a:apply(math.abs))
|
|
assert.equal(vector.new(1.1, 2.9, 2.5), vector.apply(a, f))
|
|
assert.equal(vector.new(4.1, 5.9, 5.5), a:apply(f))
|
|
end)
|
|
|
|
it("equals()", function()
|
|
local function assertE(a, b)
|
|
assert.is_true(vector.equals(a, b))
|
|
end
|
|
local function assertNE(a, b)
|
|
assert.is_false(vector.equals(a, b))
|
|
end
|
|
|
|
assertE({x = 0, y = 0, z = 0}, {x = 0, y = 0, z = 0})
|
|
assertE({x = -1, y = 0, z = 1}, {x = -1, y = 0, z = 1})
|
|
assertE({x = -1, y = 0, z = 1}, vector.new(-1, 0, 1))
|
|
local a = {x = 2, y = 4, z = -10}
|
|
assertE(a, a)
|
|
assertNE({x = -1, y = 0, z = 1}, a)
|
|
|
|
assert.equal(vector.new(1, 2, 3), vector.new(1, 2, 3))
|
|
assert.is_true(vector.new(1, 2, 3):equals(vector.new(1, 2, 3)))
|
|
assert.not_equal(vector.new(1, 2, 3), vector.new(1, 2, 4))
|
|
assert.is_true(vector.new(1, 2, 3) == vector.new(1, 2, 3))
|
|
assert.is_false(vector.new(1, 2, 3) == vector.new(1, 3, 3))
|
|
end)
|
|
|
|
it("metatable is same", function()
|
|
local a = vector.new()
|
|
local b = vector.new(1, 2, 3)
|
|
|
|
assert.equal(true, vector.check(a))
|
|
assert.equal(true, vector.check(b))
|
|
|
|
assert.equal(vector.metatable, getmetatable(a))
|
|
assert.equal(vector.metatable, getmetatable(b))
|
|
assert.equal(vector.metatable, a.metatable)
|
|
end)
|
|
|
|
it("sort()", function()
|
|
local a = vector.new(1, 2, 3)
|
|
local b = vector.new(0.5, 232, -2)
|
|
local sorted = {vector.new(0.5, 2, -2), vector.new(1, 232, 3)}
|
|
assert.same(sorted, {vector.sort(a, b)})
|
|
assert.same(sorted, {a:sort(b)})
|
|
end)
|
|
|
|
it("angle()", function()
|
|
assert.equal(math.pi, vector.angle(vector.new(-1, -2, -3), vector.new(1, 2, 3)))
|
|
assert.equal(math.pi/2, vector.new(0, 1, 0):angle(vector.new(1, 0, 0)))
|
|
end)
|
|
|
|
it("dot()", function()
|
|
assert.equal(-14, vector.dot(vector.new(-1, -2, -3), vector.new(1, 2, 3)))
|
|
assert.equal(0, vector.new():dot(vector.new(1, 2, 3)))
|
|
end)
|
|
|
|
it("cross()", function()
|
|
local a = vector.new(-1, -2, 0)
|
|
local b = vector.new(1, 2, 3)
|
|
assert.equal(vector.new(-6, 3, 0), vector.cross(a, b))
|
|
assert.equal(vector.new(-6, 3, 0), a:cross(b))
|
|
end)
|
|
|
|
it("offset()", function()
|
|
assert.same({x = 41, y = 52, z = 63}, vector.offset(vector.new(1, 2, 3), 40, 50, 60))
|
|
assert.equal(vector.new(41, 52, 63), vector.offset(vector.new(1, 2, 3), 40, 50, 60))
|
|
assert.equal(vector.new(41, 52, 63), vector.new(1, 2, 3):offset(40, 50, 60))
|
|
end)
|
|
|
|
it("is()", function()
|
|
local some_table1 = {foo = 13, [42] = 1, "bar", 2}
|
|
local some_table2 = {1, 2, 3}
|
|
local some_table3 = {x = 1, 2, 3}
|
|
local some_table4 = {1, 2, z = 3}
|
|
local old = {x = 1, y = 2, z = 3}
|
|
local real = vector.new(1, 2, 3)
|
|
|
|
assert.is_false(vector.check(nil))
|
|
assert.is_false(vector.check(1))
|
|
assert.is_false(vector.check(true))
|
|
assert.is_false(vector.check("foo"))
|
|
assert.is_false(vector.check(some_table1))
|
|
assert.is_false(vector.check(some_table2))
|
|
assert.is_false(vector.check(some_table3))
|
|
assert.is_false(vector.check(some_table4))
|
|
assert.is_false(vector.check(old))
|
|
assert.is_true(vector.check(real))
|
|
assert.is_true(real:check())
|
|
end)
|
|
|
|
it("global pairs", function()
|
|
local out = {}
|
|
local vec = vector.new(10, 20, 30)
|
|
for k, v in pairs(vec) do
|
|
out[k] = v
|
|
end
|
|
assert.same({x = 10, y = 20, z = 30}, out)
|
|
end)
|
|
|
|
it("abusing works", function()
|
|
local v = vector.new(1, 2, 3)
|
|
v.a = 1
|
|
assert.equal(1, v.a)
|
|
|
|
local a_is_there = false
|
|
for key, value in pairs(v) do
|
|
if key == "a" then
|
|
a_is_there = true
|
|
assert.equal(value, 1)
|
|
break
|
|
end
|
|
end
|
|
assert.is_true(a_is_there)
|
|
end)
|
|
|
|
it("add()", function()
|
|
local a = vector.new(1, 2, 3)
|
|
local b = vector.new(1, 4, 3)
|
|
local c = vector.new(2, 6, 6)
|
|
assert.equal(c, vector.add(a, {x = 1, y = 4, z = 3}))
|
|
assert.equal(c, vector.add(a, b))
|
|
assert.equal(c, a:add(b))
|
|
assert.equal(c, a + b)
|
|
assert.equal(c, b + a)
|
|
end)
|
|
|
|
it("subtract()", function()
|
|
local a = vector.new(1, 2, 3)
|
|
local b = vector.new(2, 4, 3)
|
|
local c = vector.new(-1, -2, 0)
|
|
assert.equal(c, vector.subtract(a, {x = 2, y = 4, z = 3}))
|
|
assert.equal(c, vector.subtract(a, b))
|
|
assert.equal(c, a:subtract(b))
|
|
assert.equal(c, a - b)
|
|
assert.equal(c, -b + a)
|
|
end)
|
|
|
|
it("multiply()", function()
|
|
local a = vector.new(1, 2, 3)
|
|
local b = vector.new(2, 4, 3)
|
|
local c = vector.new(2, 8, 9)
|
|
local s = 2
|
|
local d = vector.new(2, 4, 6)
|
|
assert.equal(c, vector.multiply(a, {x = 2, y = 4, z = 3}))
|
|
assert.equal(c, vector.multiply(a, b))
|
|
assert.equal(d, vector.multiply(a, s))
|
|
assert.equal(d, a:multiply(s))
|
|
assert.equal(d, a * s)
|
|
assert.equal(d, s * a)
|
|
assert.equal(-a, -1 * a)
|
|
end)
|
|
|
|
it("divide()", function()
|
|
local a = vector.new(1, 2, 3)
|
|
local b = vector.new(2, 4, 3)
|
|
local c = vector.new(0.5, 0.5, 1)
|
|
local s = 2
|
|
local d = vector.new(0.5, 1, 1.5)
|
|
assert.equal(c, vector.divide(a, {x = 2, y = 4, z = 3}))
|
|
assert.equal(c, vector.divide(a, b))
|
|
assert.equal(d, vector.divide(a, s))
|
|
assert.equal(d, a:divide(s))
|
|
assert.equal(d, a / s)
|
|
assert.equal(d, 1/s * a)
|
|
assert.equal(-a, a / -1)
|
|
end)
|
|
|
|
it("to_string()", function()
|
|
local v = vector.new(1, 2, 3.14)
|
|
assert.same("(1, 2, 3.14)", vector.to_string(v))
|
|
assert.same("(1, 2, 3.14)", v:to_string())
|
|
assert.same("(1, 2, 3.14)", tostring(v))
|
|
end)
|
|
|
|
it("from_string()", function()
|
|
local v = vector.new(1, 2, 3.14)
|
|
assert.same({v, 13}, {vector.from_string("(1, 2, 3.14)")})
|
|
assert.same({v, 12}, {vector.from_string("(1,2 ,3.14)")})
|
|
assert.same({v, 12}, {vector.from_string("(1,2,3.14,)")})
|
|
assert.same({v, 11}, {vector.from_string("(1 2 3.14)")})
|
|
assert.same({v, 15}, {vector.from_string("( 1, 2, 3.14 )")})
|
|
assert.same({v, 15}, {vector.from_string(" ( 1, 2, 3.14) ")})
|
|
assert.same({vector.new(), 8}, {vector.from_string("(0,0,0) ( 1, 2, 3.14) ")})
|
|
assert.same({v, 22}, {vector.from_string("(0,0,0) ( 1, 2, 3.14) ", 8)})
|
|
assert.same({v, 22}, {vector.from_string("(0,0,0) ( 1, 2, 3.14) ", 9)})
|
|
assert.same(nil, vector.from_string("nothing"))
|
|
end)
|
|
|
|
-- This function is needed because of floating point imprecision.
|
|
local function almost_equal(a, b)
|
|
if type(a) == "number" then
|
|
return math.abs(a - b) < 0.00000000001
|
|
end
|
|
return vector.distance(a, b) < 0.000000000001
|
|
end
|
|
|
|
describe("rotate_around_axis()", function()
|
|
it("rotates", function()
|
|
assert.True(almost_equal({x = -1, y = 0, z = 0},
|
|
vector.rotate_around_axis({x = 1, y = 0, z = 0}, {x = 0, y = 1, z = 0}, math.pi)))
|
|
assert.True(almost_equal({x = 0, y = 1, z = 0},
|
|
vector.rotate_around_axis({x = 0, y = 0, z = 1}, {x = 1, y = 0, z = 0}, math.pi / 2)))
|
|
assert.True(almost_equal({x = 4, y = 1, z = 1},
|
|
vector.rotate_around_axis({x = 4, y = 1, z = 1}, {x = 4, y = 1, z = 1}, math.pi / 6)))
|
|
end)
|
|
it("keeps distance to axis", function()
|
|
local rotate1 = {x = 1, y = 3, z = 1}
|
|
local axis1 = {x = 1, y = 3, z = 2}
|
|
local rotated1 = vector.rotate_around_axis(rotate1, axis1, math.pi / 13)
|
|
assert.True(almost_equal(vector.distance(axis1, rotate1), vector.distance(axis1, rotated1)))
|
|
local rotate2 = {x = 1, y = 1, z = 3}
|
|
local axis2 = {x = 2, y = 6, z = 100}
|
|
local rotated2 = vector.rotate_around_axis(rotate2, axis2, math.pi / 23)
|
|
assert.True(almost_equal(vector.distance(axis2, rotate2), vector.distance(axis2, rotated2)))
|
|
local rotate3 = {x = 1, y = -1, z = 3}
|
|
local axis3 = {x = 2, y = 6, z = 100}
|
|
local rotated3 = vector.rotate_around_axis(rotate3, axis3, math.pi / 2)
|
|
assert.True(almost_equal(vector.distance(axis3, rotate3), vector.distance(axis3, rotated3)))
|
|
end)
|
|
it("rotates back", function()
|
|
local rotate1 = {x = 1, y = 3, z = 1}
|
|
local axis1 = {x = 1, y = 3, z = 2}
|
|
local rotated1 = vector.rotate_around_axis(rotate1, axis1, math.pi / 13)
|
|
rotated1 = vector.rotate_around_axis(rotated1, axis1, -math.pi / 13)
|
|
assert.True(almost_equal(rotate1, rotated1))
|
|
local rotate2 = {x = 1, y = 1, z = 3}
|
|
local axis2 = {x = 2, y = 6, z = 100}
|
|
local rotated2 = vector.rotate_around_axis(rotate2, axis2, math.pi / 23)
|
|
rotated2 = vector.rotate_around_axis(rotated2, axis2, -math.pi / 23)
|
|
assert.True(almost_equal(rotate2, rotated2))
|
|
local rotate3 = {x = 1, y = -1, z = 3}
|
|
local axis3 = {x = 2, y = 6, z = 100}
|
|
local rotated3 = vector.rotate_around_axis(rotate3, axis3, math.pi / 2)
|
|
rotated3 = vector.rotate_around_axis(rotated3, axis3, -math.pi / 2)
|
|
assert.True(almost_equal(rotate3, rotated3))
|
|
end)
|
|
it("is right handed", function()
|
|
local v_before1 = {x = 0, y = 1, z = -1}
|
|
local v_after1 = vector.rotate_around_axis(v_before1, {x = 1, y = 0, z = 0}, math.pi / 4)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after1, v_before1)), {x = 1, y = 0, z = 0}))
|
|
|
|
local v_before2 = {x = 0, y = 3, z = 4}
|
|
local v_after2 = vector.rotate_around_axis(v_before2, {x = 1, y = 0, z = 0}, 2 * math.pi / 5)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after2, v_before2)), {x = 1, y = 0, z = 0}))
|
|
|
|
local v_before3 = {x = 1, y = 0, z = -1}
|
|
local v_after3 = vector.rotate_around_axis(v_before3, {x = 0, y = 1, z = 0}, math.pi / 4)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after3, v_before3)), {x = 0, y = 1, z = 0}))
|
|
|
|
local v_before4 = {x = 3, y = 0, z = 4}
|
|
local v_after4 = vector.rotate_around_axis(v_before4, {x = 0, y = 1, z = 0}, 2 * math.pi / 5)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after4, v_before4)), {x = 0, y = 1, z = 0}))
|
|
|
|
local v_before5 = {x = 1, y = -1, z = 0}
|
|
local v_after5 = vector.rotate_around_axis(v_before5, {x = 0, y = 0, z = 1}, math.pi / 4)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after5, v_before5)), {x = 0, y = 0, z = 1}))
|
|
|
|
local v_before6 = {x = 3, y = 4, z = 0}
|
|
local v_after6 = vector.rotate_around_axis(v_before6, {x = 0, y = 0, z = 1}, 2 * math.pi / 5)
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after6, v_before6)), {x = 0, y = 0, z = 1}))
|
|
end)
|
|
end)
|
|
|
|
describe("rotate()", function()
|
|
it("rotates", function()
|
|
assert.True(almost_equal({x = -1, y = 0, z = 0},
|
|
vector.rotate({x = 1, y = 0, z = 0}, {x = 0, y = math.pi, z = 0})))
|
|
assert.True(almost_equal({x = 0, y = -1, z = 0},
|
|
vector.rotate({x = 1, y = 0, z = 0}, {x = 0, y = 0, z = math.pi / 2})))
|
|
assert.True(almost_equal({x = 1, y = 0, z = 0},
|
|
vector.rotate({x = 1, y = 0, z = 0}, {x = math.pi / 123, y = 0, z = 0})))
|
|
end)
|
|
it("is counterclockwise", function()
|
|
local v_before1 = {x = 0, y = 1, z = -1}
|
|
local v_after1 = vector.rotate(v_before1, {x = math.pi / 4, y = 0, z = 0})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after1, v_before1)), {x = 1, y = 0, z = 0}))
|
|
|
|
local v_before2 = {x = 0, y = 3, z = 4}
|
|
local v_after2 = vector.rotate(v_before2, {x = 2 * math.pi / 5, y = 0, z = 0})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after2, v_before2)), {x = 1, y = 0, z = 0}))
|
|
|
|
local v_before3 = {x = 1, y = 0, z = -1}
|
|
local v_after3 = vector.rotate(v_before3, {x = 0, y = math.pi / 4, z = 0})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after3, v_before3)), {x = 0, y = 1, z = 0}))
|
|
|
|
local v_before4 = {x = 3, y = 0, z = 4}
|
|
local v_after4 = vector.rotate(v_before4, {x = 0, y = 2 * math.pi / 5, z = 0})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after4, v_before4)), {x = 0, y = 1, z = 0}))
|
|
|
|
local v_before5 = {x = 1, y = -1, z = 0}
|
|
local v_after5 = vector.rotate(v_before5, {x = 0, y = 0, z = math.pi / 4})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after5, v_before5)), {x = 0, y = 0, z = 1}))
|
|
|
|
local v_before6 = {x = 3, y = 4, z = 0}
|
|
local v_after6 = vector.rotate(v_before6, {x = 0, y = 0, z = 2 * math.pi / 5})
|
|
assert.True(almost_equal(vector.normalize(vector.cross(v_after6, v_before6)), {x = 0, y = 0, z = 1}))
|
|
end)
|
|
end)
|
|
|
|
it("dir_to_rotation()", function()
|
|
-- Comparing rotations (pitch, yaw, roll) is hard because of certain ambiguities,
|
|
-- e.g. (pi, 0, pi) looks exactly the same as (0, pi, 0)
|
|
-- So instead we convert the rotation back to vectors and compare these.
|
|
local function forward_at_rot(rot)
|
|
return vector.rotate(vector.new(0, 0, 1), rot)
|
|
end
|
|
local function up_at_rot(rot)
|
|
return vector.rotate(vector.new(0, 1, 0), rot)
|
|
end
|
|
local rot1 = vector.dir_to_rotation({x = 1, y = 0, z = 0}, {x = 0, y = 1, z = 0})
|
|
assert.True(almost_equal({x = 1, y = 0, z = 0}, forward_at_rot(rot1)))
|
|
assert.True(almost_equal({x = 0, y = 1, z = 0}, up_at_rot(rot1)))
|
|
local rot2 = vector.dir_to_rotation({x = 1, y = 1, z = 0}, {x = 0, y = 0, z = 1})
|
|
assert.True(almost_equal({x = 1/math.sqrt(2), y = 1/math.sqrt(2), z = 0}, forward_at_rot(rot2)))
|
|
assert.True(almost_equal({x = 0, y = 0, z = 1}, up_at_rot(rot2)))
|
|
for i = 1, 1000 do
|
|
local rand_vec = vector.new(math.random(), math.random(), math.random())
|
|
if vector.length(rand_vec) ~= 0 then
|
|
local rot_1 = vector.dir_to_rotation(rand_vec)
|
|
local rot_2 = {
|
|
x = math.atan2(rand_vec.y, math.sqrt(rand_vec.z * rand_vec.z + rand_vec.x * rand_vec.x)),
|
|
y = -math.atan2(rand_vec.x, rand_vec.z),
|
|
z = 0
|
|
}
|
|
assert.True(almost_equal(rot_1, rot_2))
|
|
end
|
|
end
|
|
|
|
end)
|
|
end)
|