Scratch
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#1 2011-10-24 12:28:14
please help with layers
Here is the game i'm working on
http://scratch.mit.edu/projects/kodarr/2062825
My problem is i want whoever has the lowest y position to be in front. then each other sprite to fall in order depending on their y position.
Example
Player y pos = -100
Enemy1 y pos = -120
Enemy2 y pos = -90
Enemy3 y pos = -150
in this example I would want Enemy 3 in first layer, Enemy1 in second, Player in third, and Enemy 2 in fourth.
In scratch the only way i know how to do that is to bring to front then move back x layers. This causes blinking of sprites when they overlap since it will show it bringing to front.
Can anyone tell me where I'm going wrong here or point me to a game that does this.
Thank you. and I know i had a post before similar to this but I couldn't figure out how to delete it and figured maybe the subject of it was why no one would help.
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#3 2011-10-24 19:37:41
- AtomicBawm3
- Scratcher
- Registered: 2009-06-27
- Posts: 1000+
Re: please help with layers
You can skip the go to front and it might work then...
Here's a method you could try:
My method I made in the last 5 minutes.
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#5 2011-10-25 11:50:15
Re: please help with layers
this doesn't check what layer they are on in my example there are more than 2 sprites each needing to be on the proper layer especially if more than 2 are colliding at a time.
How would i do it if 3 or even 4 of them are colliding all at the same time. How are you sure which sprites collision code will run first to note which layer they are moving to and how do you tell what their current layer is?
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#6 2011-10-25 15:11:41
Re: please help with layers
Got it working with 2 sprites heres the code i have. Haven't yet had the chance to test with 3 sprites.
Start of program all sprites need to be sent to front in order of their y position. Send higher y positions forward first.
and set the sprite layers according to the order you initially sorted them.
then have a forever loop broadcasting sortsprites
on the player and on each sprite you need to check
if touching another sprite
if sprite1layer>sprite2layer and sprite2>sprite1y
go back 1 layers
change sprite1layer by -1
change sprite2layer by 1
else
if sprite2layer>sprite1layer and sprite1y>sprite2y
go back -1 layers
change sprite1layer by 1
change sprite2layer by -1
Like I said this works for 2 sprites but I think adding the 3rd sprite will kill the way I'm sorting the inital 2 sprites so may need to rework that. Is there an easier way than this or is this the way it needs done? seems like a lot of computing and running that code way too often.
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#7 2011-10-26 12:38:02
Re: please help with layers
My logic seems to be a bit off. When I add a second enemy so there are 3 sprites it works only about 1/5 of the time. heres what i have any ideas how to modify this will help.
On player sprite
When green flag is pressed
broadcast all front and wait
When I recieve all front
set Enemy2Layer to 3
broadcast E2front and wait
set Enemy1Layer to 2
broadcast E1front and wait
set PlayerLayer to 1
broadcast Pfront and wait
When I recieve Pfront
go to front
When I recieve sortsprite
if touching enemy1
if enemy1layer>playerlayer and playerypos>enemy1ypos
go back 1 layers
change enemy1layer by -1
change playerlayer by 1
broadcast Layercheck
else
if enemy1layer<playerlayer and playerypos<enemy1ypos
go back -1 layers
change enemy1layer by 1
change playerlayer by -1
broadcast Layercheck
if touching enemy2
if enemy2layer>playerlayer and playerypos>enemy2ypos
go back 1 layers
change enemy2layer by -1
change playerlayer by 1
broadcast Layercheck
else
if enemy2layer<playerlayer and playerypos<enemy2ypos
go back -1 layers
change enemy2layer by 1
change playerlayer by -1
broadcast Layercheck
Layercheck is just seeing if any 2 values of layer variables are equal and if so it changes both by 1 up or down. This is just so all 3 sprites don't end up with the same number.
ex: if enemy1layer = player layer and playerypos>enemy1ypos
change enemy1layer by -1
change playerlayer by 1
go back 1 layers
sortsprite is being broadcasted over and over
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