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