/**
 * @class Abstract pathfinder
 * @param {int} toX Target X coord
 * @param {int} toY Target Y coord
 * @param {function} passableCallback Callback to determine map passability
 * @param {object} [options]
 * @param {int} [options.topology=8]
 */
ROT.Path = function(toX, toY, passableCallback, options) {
	this._toX = toX;
	this._toY = toY;
	this._fromX = null;
	this._fromY = null;
	this._passableCallback = passableCallback;
	this._options = {
		topology: 8
	}
	for (var p in options) { this._options[p] = options[p]; }

	this._dirs = ROT.DIRS[this._options.topology];
}

/**
 * Compute a path from a given point
 * @param {int} fromX
 * @param {int} fromY
 * @param {function} callback Will be called for every path item with arguments "x" and "y"
 */
ROT.Path.prototype.compute = function(fromX, fromY, callback) {
}

ROT.Path.prototype._getNeighbors = function(cx, cy) {
	var result = [];
	for (var i=0;i<this._dirs.length;i++) {
		var dir = this._dirs[i];
		var x = cx + dir[0];
		var y = cy + dir[1];
		
		if (!this._passableCallback(x, y)) { continue; }
		result.push([x, y]);
	}
	
	return result;
}