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-- this function rotates a given array of Points using an origin
-- @param:
--      zPoints: Points (array of ZonePoints)
--      origin: Point
--      alpha: float (degree: 0° - 359°)
-- @return
--      zPoints: Points (array of ZonePoints)
function rotateZone(zPoints, origin, alpha)

    local index
    local value
    local newBearing = 0
    local bearing
    local distance

    alpha = math.fmod(math.floor(alpha), 360)

    if alpha == 0 then
        return zPoints
    end

    for index, value in pairs(zPoints) do
        -- Calculate distance and bearing between origin and point of zone
        distance, bearing = VectorToPointSafeToUseOniPhone(origin, zPoints[index])

        -- calculate new bearing
        if bearing + alpha >= 360 then
            newBearing = bearing + alpha - 360
        elseif bearing + alpha < 0 then
            newBearing = bearing + alpha + 360
        else
            newBearing = bearing + alpha
        end

        --set new lat and long value
        zPoints[index] = Wherigo.TranslatePoint(origin, distance, newBearing)
    end

    return zPoints
end
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