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$.geom = (function()
{
    var s32 = Math.sqrt(3)/2;

    function Position(s, ring, i)
    {
        var x, y;
        switch (s)
        {
        case 1: x =  ring   - i/2;  y =        - i; break;
        case 2: x =  ring/2 - i;    y =  -ring    ; break;
        case 3: x = -ring/2 - i/2;  y =  -ring + i; break;
        case 4: x = -ring   + i/2;  y =        + i; break;
        case 5: x = -ring/2 + i;    y =   ring    ; break;
        case 0: x =  ring/2 + i/2;  y =   ring - i; break;
        }

 	var d = x*x + y*y*3/4;
	if (d - x > 395.75)
           return;

        return [ x, y*s32 ];
    }

    var map = $.map;
    var geom = new Array(1440);
    geom[map[0]] = [ 0, 0 ];
    var cnt = 1;
    for (var ring=1; ring<24; ring++)
    {
        for (var s=0; s<6; s++)
        {
            for (var i=1; i<=ring; i++)
            {
                var pos = Position(s, ring, i);
                if (pos===undefined)
                    continue;

                geom[map[cnt++]] = pos;
            }
        }
    }

    geom[map[1438]] = [ 7, -22*s32 ];
    geom[map[1439]] = [ 7,  22*s32 ];

    return geom;
})();

$.dist = function(i, j)
{
    var dx = $.geom[i][0]-$.geom[j][0];
    var dy = $.geom[i][1]-$.geom[j][1];

    return Math.sqrt(dx*dx + dy*dy);
}

$.conv = 0.1111;