Wrap X & Y on a screen area that is actually smaller than the phone screen

Zombiebrains

Hi all

Quick question?

Can you in Gamesalad Wrap X/Y on a part of the game screen or will it only work on the whole screen.

I'm only asking as I have a graphic of an arcade machine over my main play area and the screen that the action appears is only x/y big so was wondering if my asteroid style game will work correctly if the visible game screen area can have the correct Warp x and Wrap y?

I currently have the whole iphone screen as wrap x and wrap y.

Thanks in advance

slowcut

Hi, the wrap behavior will only work for the whole screen, in your case you have to rebuild a custom wrap x/y behavior manually... but this will be no big deal. Build it once, and add the rules to a group and add this group to your custom behaviors and then use it for all your actors by dragging it to them from the custom behavior list

Zombiebrains

lol how do i create a customer x & y behaviour?

Hi, the wrap behavior will only work for the whole screen, in your case you have to rebuild a custom wrap x/y behavior manually... but this will be no big deal. Build it once, and add the rules to a group and add this group to your custom behaviors and then use it for all your actors by dragging it to them from the custom behavior list

Hi Slowcut again!

Your always to my rescue!

lol how do i create a custom x & y behaviour?

slowcut

There are a lot of ways... use your imagination...
For example create separate attributes for left/right/up/down limits and set their values to your virtual screen borders, and if actors position x > right limit, change x position to left limit and vice versa, do the same for y axis and up/down limits...
There you go

Zombiebrains

lol sounds complicated

I get the setting up the attributes for right, left,up & down...but how would it know say, if the ship went off screen at x position 300 it would know where to come in from the left...how would it know how high it was in the y axis?

slowcut

In every rule you can record the x and y position and transfer it to the opposite side of the screen, you can also compare the positions to the relation of the middle of the screen and transfer it, to get a real wrap behavior if your movements are not only in a straight horizontal and vertical direction

Zombiebrains

ok, thanks Slowcut...will give it a go

Thank you for your help as always

slowcut

For example, your virtual screensize is 512x512 and you are developing for iPad portrait (768x1024) and your virtual screen is in the middle of the real screen
Left limit: 768/2-512/2 = 128
Right limit: 768/2+512/2 = 640
Upper limit: 1024/2 + 512/2 = 768
Lower limit: 1024/2 -512/2 = 256

Rule: if self.positionX. > right limit
- change self.positionX to left limit
- change self.PositionY to 1024/2-(self.PositionY-512)

if your actor leaves screen at x: 640, y: 600 it will be moved to x: 128, y: 424
If it leaves at x: 640, y: 300 it returns at x: 128, y: 724

Adapt this for X< left limit and Y > upper limit and Y < lower limit

quantumsheep

That's some great advice from slowcut.

Personally, I like to use physical borders. For example I have four actors, labelled left, right, top, bottom.

These are placed outside the main screen, a little distance off from their respective edges.

In each 'enemy' I have the rules:

If you collide with right actor, move to the left side of the screen (coordinates).
If you collide with left actor, mover to right side of the screen (coordinates).

And so on.

The trick is to make sure when they hit an actor, not to place them so they immediately hit the opposite actor (which is why I place them a little away from the edges!)

My game, DotMatrixx uses this for the enemy movement/placing - it's free if you have a Mac: https://itunes.apple.com/gb/app/dotmatrixx/id481691880?mt=12



Hope that helps!

QS =D

Zombiebrains

Hi Slowcut and Quantumsheep.

That's great advice from both of you. I will try and get the game working now and it was bugging me as I've left the project alone for ages as just couldn't get the thing working properly.

Thank u both for your advice and time...