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Grid Movement Checking

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  • Is there a simple way to check to see if any spaces around an object are empty and move to that space; and if they aren't have the two objects swap positions.

    I'm trying to do this on a grid system using an Array and the object themselves have a grid behavior to make movement easier.

  • kinda a tall order.

    the long answer:

    ---------------------{array alighnment}--------------------------------

    you need to align everything to a grid, something like 64x64

    then set a value 'Tx' (so tile x position) and 'Ty' for your object

    always set those value to

    Tx: round(.x/64)

    Ty: round(.y/64)

    this will give you your x and y position in your array.

    have a similar process for all your objects (maybe just put them all in a family so you only have to do this once?)

    -------------------------- {Moving}------------------------------------

    always,

    for each object:

    • >set position array ('Tx','Ty'+1<-(or whatever),2)too object .uid

    then when an object want to move in a given direction

    check that spaces Z2 position, if that position is equal to 0, go ahead and move.

    but if its not

    • >add parameter: value at array position (the tile being checked,z2)
    • >add parameter: oject value'Tx'
    • >add parameter: object value'Ty'
    • >call a function "swap" forgetting objects(this is just to make sure the program forgets the current object)
    • > move to space ( it will be clear, because the funtcion will have taken care of that.)

    on function "swap"

    object uid = 'paramiter 1'

            -> move to( parameter 2, parameter 3)

    ------------------------------{checking}--------------------------------

    as far as checking the fastest method(in terms of cpu speed) is manually so:

    is position at array(Tx+1, ty,2)

    however this can be time consuming to write, and a little messy to read.

    so the other method is to check using Modulo [ the symbol %](for and extended explanation go to Tulamide's little corner)

    but for or purposes it will be calling a loop 4 time's and checking the value of:

    .Tx + ((loop-2)%2)

    so -1,0,1,0

    .Ty + ((loop-1)%2)

    so 0,-1,0,1

    -----------------------------

    so in you script it would look like

    on loop "check"

    array position((.Tx + ((loop-2)%2),(.Ty + ((loop-1)%2),2)=0

          than do the stuff we talked about.

    --------------------(Replacing only if it has too)--------------------

    so i take it you want the object to only replace something if thats the only thing it can do?

    this would be a mater of how you organize you events.

    when the objects ready to move, set another value in it like 'moveme'

    to 1

    for each object     

    value 'moveme' = 1:

       - call loop "blank search"

    on loop "black search"

    - preform the search mention above and if something matches what its checking.

       -> move the object

       -> set object 'moveme' to 0

    than another event after the first (beacuse its after the first, it will only happen if the value move is still equal to 0)

    for each object     

    value 'moveme' = 1:

       - call loop "swap search"

    on loop "swap search"

    - preform the search mention above and if something matches what its checking.

       -> do the paramiter switching function thing

       -> move the object

       -> set object 'moveme' to 0

         

    _______________________________________________________________________       

    for some more advance moving and checking in arrays

    Array A*

    you can ignore the actual A* part, and just look at how it checks,

    ______________________________________________________________________

    I just did this of the top of my head, it should work, but i would need to see your specific case to know for sure.

    --------------------------------------------------------

    so the short answer too your question :

    "Is there a simple way to check to see if any spaces around an object are empty and move to that space; and if they aren't have the two objects swap positions. "

    ...no..

    (unless somebody made a plugin)

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  • Wow. Thank you for that. I honestly did think that it was a simple problem. I'll give this a shot.

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