The setup consists of two game objects.

The invisible trigger. Contains:
  • A Collision object component. The Type is set to TRIGGER. A box Shape is added to the components.
The bunny. Contains:
  • A Sprite component with the bunny image.
  • A Collision object component. It has Type set to DYNAMIC. A sphere Shape matching the sprite image is added to the components.
  • A Script component that animates the bunny’s position and reacts to physics messages when interacting with the trigger.



function init(self)
	local pos = go.get_position() -- <1>
	go.animate(".", "position.x", go.PLAYBACK_LOOP_PINGPONG, pos.x + 600, go.EASING_INOUTSINE, 6)

function on_message(self, message_id, message, sender)
	if message_id == hash("trigger_response") then -- <2>
		if message.enter then -- <3>"#sprite", "disable") -- <4>
		else"#sprite", "enable") -- <5>

1. Get the current position, then animate the position's x component
   looping in a ping-pong manner against an offset of 600.
2. The physics engine has detected that this game object contains
   collision object components that have collided with a trigger.
3. The `message` data table contains a field `enter` that is set
   to `true` when the trigger event signals that the trigger shape
   was entered. On exiting the trigger, this field is `false`.
4. Disable the sprite when the trigger is entered
5. Enable the sprite again on exit.

If you want to play with these examples, you can get the project on Github.

Do you want to see more examples? Why not write a few yourself and submit a pull request? We love contributions.