AWS Documentation » Amazon Lumberyard » User Guide » Creating and Customizing Game User Interfaces » Animating the UI » Scripted Tweener Entity System » Tweener Lua Script

Tweener Lua Script

You must have a minimum set of code to play an animation in the Scripted Entity Tweener system. As described in Tweener Sample Level, you add this code to a Lua script. You can copy and paste the code into a text file, and then change the file name extension to .lua. You use this script as part of a Lua script component. For more information about Lua script components, see Adding Lua Scripts to Component Entities.

In the following example, the entity's opacity is linearly tweened to 0.5 over 5 seconds.

local AnimateUiEntity = 
{
	Properties =
	{
		ToAnimate = {default = EntityId()},
	},
}
function AnimateUiEntity:OnActivate()
	self.tickBusHandler = TickBus.Connect(self)
	self.ScriptedEntityTweener = require("Scripts.ScriptedEntityTweener.ScriptedEntityTweener")
end

function AnimateUiEntity:OnTick(deltaTime, timePoint)
	self.tickBusHandler:Disconnect()
	self.ScriptedEntityTweener:StartAnimation
	{
		id = self.Properties.ToAnimate,
		duration = 5.0,
		["opacity"] = 0.5,
	}
end
function AnimateUiEntity:OnDeactivate()
	self.ScriptedEntityTweener:OnDeactivate()
end
return AnimateUiEntity

The following example shows a full call with all the default parameters. In this example, the entity moves to the ["x"] and ["y"] positions indicated in the code over the duration of 5 seconds.

self.ScriptedEntityTweener:StartAnimation
	{
		id = self.Properties.ToAnimate,
		duration = 5.0,
		["x"] = 150, ["y"] = 200,
		timeIntoTween = 0, -- Start tween some seconds in
		easeMethod = ScriptedEntityTweenerEasingMethod_Linear,
		easeType = ScriptedEntityTweenerEasingType_In,
		delay = 0,
		timesToPlay = 1,
		isFrom = false,
		isPlayingBackward = false,
		uuid = Uuid.Create(),
		--onComplete = function() Debug.Log("Called when this animation is done") end
		--onUpdate = function(currentValue, currentProgressPercent) Debug.Log("Called when this animation updates") end
		--onLoop = function() Debug.Log("Looped animation”) end
	}

For the parameter descriptions, see Tweener Supported Components.