Isometric: Mouse to map

    /**
     * Find the index of the tile at given position.
     * Result is -1 if the point is outside map.
     *
     * @param   Point       A point in world coordinates.
     * @return  An Int containing the index of the tile at this coordinate. -1 if no tile were found.
     */
    public function getIndexFromPoint(Point:FlxPoint):Int
    {
        //Calculate corrected mouse position
        var x0 = Point.x - heightInTiles * _scaledTileWidth * 0.5 - x;
        var y0 = Point.y - y - _scaledTileHeight;

        //Calculate coordinates
        var floatrow = y0 / _scaledTileDepth - x0 / _scaledTileWidth;
        var floatcol = y0 / _scaledTileDepth + x0 / _scaledTileWidth;

        if (floatrow < 0 || floatcol < 0)
            return -1;

        var col = Std.int(floatcol);
        var row = Std.int(floatrow);

        //Check if the coordinates are valid
        if (row >= heightInTiles || col >= widthInTiles)
            return -1;

        //Finally compute the index
        return row * widthInTiles + col;
    }