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Handle Special Road Alerts

Handle special road alerts

This tutorial shows how to handle special road alerts.

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All special road alerts are zone alerts representing a zone with special road condition.

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void AlertObserver::onAlertInfoUpdated(const tn::drive::models::v1::AlertInfo& alertInfo)
{
    const auto& aheadAlerts = alertInfo.alerts_ahead;
    for (const auto& alert : aheadAlerts.zone_alerts)
    {
        // following types are special road alerts:
        // tn::drive::models::v1::AlertType::Ferry
        // tn::drive::models::v1::AlertType::Tunnel
        // tn::drive::models::v1::AlertType::Overpass
        // tn::drive::models::v1::AlertType::Underpass
        // tn::drive::models::v1::AlertType::SpeedBumper
        // tn::drive::models::v1::AlertType::Unpaved
        const auto type = alert.basic.type;

        // each alert item has a unique identifier, can be used to match alert updates
        const auto id = alert.basic.id;

        if (alert.basic.distance_to_vehicle == 0)
        {
            // vehicle has entered the zone
            // get distance along road between zone begin location and current vehicle location
            const auto pastDistance = alert.zone.past_distance;
        }

        showAlertIconOnMap(id, type, alert.zone.begin, alert.zone.end);
    }
}