[Solved]How do I Move an Object in Layer Depends on Y axis?

I have a sprite which have 3 frame colored red,blue and green.

Green one is top of the layer

Red one is the middle of the layer

Blue one is bottom of the layer

I want to do this; pick sprite instance which Y axis > the other instances y axis,move that instance which is picked in front of the other instances on layer.

Edit : I solved the problem using 'For each ordered' loop.

Sort object instances by Y co-ordinate:

+ For each Sprite order by Sprite.Y ascending

-> Sprite: send to front

That works. But it is a bit 'the old way'. It can be done faster today, with loops (in the background) optimised by C2 code.

First give the Sprite an instance variable, lets say 'Yposition'

Top-level event

or system > condition > Trigger Once While true (when you want to do it only once)

or system > condition > Every Tick (when you want to do it continues)

_______Action > Sprite > Set value > 'Yposition' = Self.Y (this loops (optimised) trough the sprites and sets the instance variable for each)

_______Action > System > Sort Z order > object = Sprite ... Instance variable = 'Yposition' (this will set the Z order for (another optimised loop) each sprite based on Y, nicely packing the indexes)

99Instances2Go Oh,thank you!