How do I create alert indicator sprite in screen?

The player is always on the screen(1280x720) and the layout size is 5000,5000. There are enemies ships that are inside the layout, but not on screen. How do I make an alert indicator sprite that indicates that a enemy ship is coming towards the player?

Here is a image example:

https://www.dropbox.com/s/wb7ooall7d2kl ... .png?dl=0#

Thanks in advance

You could set a boolean on the enemy, and if your game logic triggers the enemy to go towards the player, set the boolean.

And looping through the enemies you could have an indicator appear if the boolean is set.

How do I keep the indicator inside the window?

Create a layer for the UI and set its parallax to 0,0. Add the alert sprite to that layer and set its visibility to false. When the alert is triggered, have it set the sprite's visibility to true.

https://www.scirra.com/tutorials/353/of ... indicators

ramones Thank you so much it work, thanks everyone!