Hello all,

I'm currently making an isometric game using tiles based off of Shaun Spalding's isometric game rendering tutorial. I have the system down, I just can't seem to find a good way to handle collisions. It seems that any object I place into the room goes wherever it feels like. With an adjustment of 1 pixel throwing the object across the room.

Here is the macros script:

function macros(){
    #macro MAP_W 64
    #macro MAP_H 120
    #macro TILE_W 32
    #macro TILE_H 16
    #macro SCREEN_W 1024
    #macro SCREEN_H 1920

    enum TILE{
        SPRITE = 0,
        Z = 1
    }
}

Here is the ScreenToTileX and ScreenToTileY script:

function ScreenToTileX(){
    var _screenX = argument0 - (SCREEN_W * 0.5);
    var _screenY = argument1 - (SCREEN_H * 0.25);
    return floor((_screenX / (TILE_W * 0.5)   _screenY / (TILE_H * 0.5) ) * 0.5);
}

function ScreenToTileY(){
    var _screenX = argument0 - (SCREEN_W * 0.5);
    var _screenY = argument1 - (SCREEN_H * 0.25);
    return floor((_screenY / (TILE_H * 0.5) - (_screenX / (TILE_W * 0.5)))*0.5);
}

Here is the TileToScreenX and TileToScreenY script:

function TileToScreenX(){
    var _tX = argument0;
    var _tY = argument1;
    return ((_tX - _tY) * (TILE_W * 0.5))   (SCREEN_W * 0.5);

}


function TileToScreenY(){
    var _tX = argument0;
    var _tY = argument1;
    return ((_tX   _tY) * (TILE_H * 0.5))   (SCREEN_H * 0.25);

}

Any help in just understanding how I would program like collisions and stuff would be greatly appreciated, thank you!