Update spring solver

test/mock.luau

@@ -256,6 +256,40 @@ local Vector2 = { __type = "Vector2" } :: any do
     end
 end
 
+local Vector3 = { __type = "Vector3" } :: any do
+    local function new(x, y, z)
+        return setmetatable({ X = x, Y = y, Z = z }, Vector3)
+    end
+
+    function Vector3.new(x, y, z)
+        return new(x or 0, y or 0, z or 0)
+    end
+
+    function Vector3.__add(a, b)
+        return new(a.X + b.X, a.Y + b.Y, a.Z + b.Z)
+    end
+
+    function Vector3.__sub(a, b)
+        return new(a.X - b.X, a.Y - b.Y, a.Z - b.Z)
+    end
+
+    function Vector3.__mul(a, b)
+        return new(a.X * b, a.Y * b, a.Z * b)
+    end
+
+    function Vector3.__unm(v)
+        return new(-v.X, -v.Y, -v.Z)
+    end
+
+    function Vector3.__eq(a, b)
+        return a.X == b.X and a.Y == b.Y
+    end
+
+    function Vector3.__index(v)
+        return (v.X^2 + v.Y^2 + v.Z^2)^0.5
+    end
+end
+
 local UDim2 = { __type = "UDim2" } :: any do
     function UDim2.new(sx, ox, sy, oy)
         return table_to_proxy(setmetatable({ x = { scale = sx, offset = ox }, y = { scale = sy, offset = oy } }, UDim2))
@@ -294,8 +328,8 @@ return {
     Signal = Signal,
     Instance = Instance :: typeof(Instance),
     Color3 = Color3 :: typeof(Color3),
-    Vector3 = Vector3 :: typeof(Vector3),
     Vector2 = Vector2 :: typeof(Vector2),
+    Vector3 = Vector3 :: typeof(Vector3),
     UDim2 = UDim2 :: typeof(UDim2),
     Enum = Enum :: typeof(Enum),
     typeof = typeof :: typeof(typeof)

test/spring-test.luau

@@ -0,0 +1,71 @@
+local vide = require "src/init"
+local testkit = require("test/testkit")
+
+local program_time = os.clock()
+
+local function step(): number
+    local FPS = 60
+    local DT = 1/FPS
+
+    repeat until os.clock() - program_time >= DT
+    program_time += DT
+    return DT
+end
+
+local function main()
+    local source = vide.source
+    local spring = vide.spring
+    local watch = vide.watch
+
+    local TERMINAL_HEIGHT = 73 --* REDUCE IF BAR DOES NOT FIT IN TERMINAL
+    local MIN_ALPHA = 0.3
+    local MAX_ALPHA = 0.7
+
+    local MIN = TERMINAL_HEIGHT * MIN_ALPHA
+    local MAX = TERMINAL_HEIGHT * MAX_ALPHA
+    local OFFSET = TERMINAL_HEIGHT - MAX
+
+    local BLOCK = "█"
+
+    local function remainder_to_block(x)
+        return
+            if x > 7/8 then "█"
+            elseif x > 6/8 then "▇"
+            elseif x > 5/8 then "▆"
+            elseif x > 4/8 then "▅"
+            elseif x > 3/8 then "▄"
+            elseif x > 2/8 then "▃"
+            elseif x > 1/8 then "▂"
+            else "▁"
+    end
+
+    local value = source(MAX)
+    local sprung = spring(value, 1, 0.3)
+
+    watch(function()
+        local v = sprung()
+        local fv = math.floor(v)
+        local reset = "\27[H\27[2J" -- ANSI clear terminal
+        local offset = string.rep("\n", MAX - fv + OFFSET)
+        local bar = testkit.color.gray(remainder_to_block(v - fv) .. "\n" .. string.rep(BLOCK .. "\n", fv))
+        print(reset .. offset .. bar)
+    end)
+
+    local elapsed = 0
+    repeat local dt = step()
+        vide.step(dt)
+
+        local T = 3
+        elapsed += dt
+        while elapsed >= T do
+            elapsed -= T
+            value(value() == MAX and MIN or MAX)
+        end
+
+    until false
+end
+
+main()
+
+
+

test/tests.luau

@@ -1240,7 +1240,7 @@ TEST("spring()", function()
         input(1)
         vide.step(0.05)
         CHECK(output() ~= input()) -- check spring is moving
-        vide.step(6) -- spring finished, should be internally removed from queue
+        vide.step(10) -- spring finished, should be internally removed from queue
         CHECK(output() == input()) -- check spring is at target
 
         local count = -1
@@ -1250,13 +1250,13 @@ TEST("spring()", function()
         end)
 
         vide.step(1) -- attempt to cause another spring update
-        CHECK(count == 1) -- check no update occurs as spring is finished
+        CHECK(count == 0) -- check no update occurs as spring is finished
         --
 
         gc() -- perform full gc
         input(2) -- spring should be re-added to spring queue
         vide.step(0) -- process spring queue
-        CHECK(count == 2) -- check spring was rescheduled correctly
+        CHECK(count == 1) -- check spring was rescheduled correctly
     end
 end)