var groundChar = '.', bodyChar = 'o', headChar = '@';

var xMin = 0, xMax = 80, yMin = 0, yMax = 25;

var GRID_CENTER = {x: Math.floor((xMax - xMin)/2),
           y: Math.floor((yMax - yMin)/2) };

var headLoc = GRID_CENTER;
var body = [];

var bodyLength = 4;

var UP = 'u', DOWN = 'd',
    LEFT = 'l', RIGHT = 'r';

var direction = RIGHT;

var numLoc = undefined;

var tickTimeout = 500;