global testedCells = [];

function getObstacleArea(obs)
{
    var area = 1;
    for (var cell in getCellsAroundCell(obs, 1))
    {
        if (isObstacle(cell) && !inArray(testedCells, cell)) {
            push(testedCells, cell);
            area += getObstacleArea(cell);
        }
    }
    return area;
}

function getCellsAroundCell(cell, scope)
{
    var x = getCellX(cell);
    var y = getCellY(cell);
    var cells = [];
    for (var i = -scope; i <= scope; i++)
        for (var j = -scope; j <= scope; j++)
            if (i != 0 and j != 0)
                push(cells, getCellFromXY(x + i, y + j));
    return cells;
}