186 lines
4.2 KiB
Lua
186 lines
4.2 KiB
Lua
local vec2 = require "modules.vec2"
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local DBL_EPSILON = require("modules.constants").DBL_EPSILON
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local abs, sqrt = math.abs, math.sqrt
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describe("vec2:", function()
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it("creates an empty vector", function()
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local a = vec2()
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assert.is.equal(0, a.x)
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assert.is.equal(0, a.y)
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assert.is_true(a:is_vec2())
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assert.is_true(a:is_zero())
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end)
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it("creates a vector from a number", function()
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local a = vec2(3)
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assert.is.equal(3, a.x)
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assert.is.equal(3, a.y)
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end)
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it("creates a vector from numbers", function()
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local a = vec2(3, 5)
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assert.is.equal(3, a.x)
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assert.is.equal(5, a.y)
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end)
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it("creates a vector from a list", function()
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local a = vec2 { 3, 5 }
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assert.is.equal(3, a.x)
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assert.is.equal(5, a.y)
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end)
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it("creates a vector from a record", function()
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local a = vec2 { x=3, y=5 }
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assert.is.equal(3, a.x)
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assert.is.equal(5, a.y)
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end)
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it("clones a vector", function()
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local a = vec2(3, 5)
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local b = a:clone()
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assert.is.equal(a, b)
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end)
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it("adds a vector to another", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = vec2():add(a, b)
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local d = a + b
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assert.is.equal(10, c.x)
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assert.is.equal(9, c.y)
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assert.is.equal(c, d)
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end)
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it("subracts a vector from another", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = vec2():sub(a, b)
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local d = a - b
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assert.is.equal(-4, c.x)
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assert.is.equal( 1, c.y)
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assert.is.equal( c, d)
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end)
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it("multiplies a vector by a scale factor", function()
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local a = vec2(3, 5)
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local s = 2
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local c = vec2():scale(a, s)
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local d = a * s
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assert.is.equal(6, c.x)
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assert.is.equal(10, c.y)
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assert.is.equal(c, d)
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end)
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it("divides a vector by another vector", function()
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local a = vec2(3, 5)
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local s = vec2(2, 2)
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local c = vec2():div(a, s)
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local d = a / s
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assert.is.equal(1.5, c.x)
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assert.is.equal(2.5, c.y)
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assert.is.equal(c, d)
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end)
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it("inverts a vector", function()
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local a = vec2(3, -5)
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local b = -a
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assert.is.equal(-a.x, b.x)
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assert.is.equal(-a.y, b.y)
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end)
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it("gets the length of a vector", function()
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local a = vec2(3, 5)
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assert.is.equal(sqrt(34), a:len())
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end)
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it("gets the square length of a vector", function()
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local a = vec2(3, 5)
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assert.is.equal(34, a:len2())
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end)
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it("normalizes a vector", function()
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local a = vec2(3, 5)
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local b = vec2():normalize(a)
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assert.is_true(abs(b:len()-1) < DBL_EPSILON)
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end)
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it("trims the length of a vector", function()
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local a = vec2(3, 5)
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local b = vec2():trim(a, 0.5)
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assert.is_true(abs(b:len()-0.5) < DBL_EPSILON)
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end)
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it("gets the distance between two vectors", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = a:dist(b)
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assert.is.equal(sqrt(17), c)
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end)
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it("gets the square distance between two vectors", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = a:dist2(b)
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assert.is.equal(17, c)
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end)
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it("crosses two vectors", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = a:cross(b)
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assert.is.equal(-23, c)
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end)
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it("dots two vectors", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local c = a:dot(b)
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assert.is.equal(41, c)
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end)
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it("interpolates between two vectors", function()
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local a = vec2(3, 5)
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local b = vec2(7, 4)
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local s = 0.1
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local c = vec2():lerp(a, b, s)
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assert.is.equal(3.4, c.x)
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assert.is.equal(4.9, c.y)
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end)
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it("unpacks a vector", function()
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local a = vec2(3, 5)
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local x, y = a:unpack()
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assert.is.equal(3, x)
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assert.is.equal(5, y)
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end)
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it("rotates a vector", function()
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local a = vec2(3, 5)
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local b = vec2():rotate(a, math.pi)
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local c = vec2():rotate(b, -math.pi)
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assert.is_not.equal(a, b)
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assert.is.equal(a, c)
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end)
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it("converts between polar and cartesian coordinates", function()
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local a = vec2(3, 5)
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local r, t = a:to_polar()
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local b = vec2.from_cartesian(r, t)
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assert.is.equal(a.x, b.x)
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assert.is.equal(a.y, b.y)
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end)
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it("gets a perpendicular vector", function()
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local a = vec2(3, 5)
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local b = vec2():perpendicular(a)
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assert.is.equal(-5, b.x)
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assert.is.equal( 3, b.y)
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end)
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it("gets a string representation of a vector", function()
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local a = vec2()
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local b = a:to_string()
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assert.is.equal("(+0.000,+0.000)", b)
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end)
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end)
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