add gs

RCCService2018/content/LuaPackages/OtterImpl/createSingleMotor.lua

@@ -0,0 +1,84 @@
+local RunService = game:GetService("RunService")
+
+local createSignal = require(script.Parent.createSignal)
+
+local SingleMotor = {}
+SingleMotor.prototype = {}
+SingleMotor.__index = SingleMotor.prototype
+
+local function createSingleMotor(initialValue)
+	assert(typeof(initialValue) == "number")
+
+	local self = {
+		__goal = nil,
+		__state = {
+			value = initialValue,
+			complete = true,
+		},
+		__onComplete = createSignal(),
+		__onStep = createSignal(),
+	}
+
+	setmetatable(self, SingleMotor)
+
+	return self
+end
+
+function SingleMotor.prototype:start()
+	self.__connection = RunService.RenderStepped:Connect(function(dt)
+		self:step(dt)
+	end)
+end
+
+function SingleMotor.prototype:stop()
+	if self.__connection ~= nil then
+		self.__connection:Disconnect()
+	end
+end
+
+function SingleMotor.prototype:step(dt)
+	assert(typeof(dt) == "number")
+
+	if self.__state.complete then
+		return
+	end
+
+	if self.__goal == nil then
+		return
+	end
+
+	local newState = self.__goal:step(self.__state, dt)
+
+	if newState ~= nil then
+		self.__state = newState
+	end
+
+	self.__onStep:fire(self.__state.value)
+
+	if self.__state.complete then
+		self.__onComplete:fire(self.__state.value)
+	end
+end
+
+function SingleMotor.prototype:setGoal(goal)
+	self.__goal = goal
+	self.__state.complete = false
+end
+
+function SingleMotor.prototype:onStep(callback)
+	assert(typeof(callback) == "function")
+
+	return self.__onStep:subscribe(callback)
+end
+
+function SingleMotor.prototype:onComplete(callback)
+	assert(typeof(callback) == "function")
+
+	return self.__onComplete:subscribe(callback)
+end
+
+function SingleMotor.prototype:destroy()
+	self:stop()
+end
+
+return createSingleMotor