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/****************************************************************************
*
* (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
*
* QGroundControl is licensed according to the terms in the file
* COPYING.md in the root of the source code directory.
*
****************************************************************************/
#include "Terrain.h"
#include <QUrl>
#include <QUrlQuery>
#include <QNetworkRequest>
#include <QNetworkProxy>
#include <QNetworkReply>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
ElevationProvider::ElevationProvider(QObject* parent)
: QObject(parent)
{
}
bool ElevationProvider::queryTerrainData(const QList<QGeoCoordinate>& coordinates)
{
if (_state != State::Idle || coordinates.length() == 0) {
return false;
}
QUrlQuery query;
QString points = "";
for (const auto& coordinate : coordinates) {
points += QString::number(coordinate.latitude(), 'f', 10) + ","
+ QString::number(coordinate.longitude(), 'f', 10) + ",";
}
points = points.mid(0, points.length() - 1); // remove the last ','
query.addQueryItem(QStringLiteral("points"), points);
QUrl url(QStringLiteral("https://api.airmap.com/elevation/stage/srtm1/ele"));
url.setQuery(query);
QNetworkRequest request(url);
QNetworkProxy tProxy;
tProxy.setType(QNetworkProxy::DefaultProxy);
_networkManager.setProxy(tProxy);
QNetworkReply* networkReply = _networkManager.get(request);
if (!networkReply) {
return false;
}
connect(networkReply, &QNetworkReply::finished, this, &ElevationProvider::_requestFinished);
_state = State::Downloading;
return true;
}
void ElevationProvider::_requestFinished()
{
QNetworkReply* reply = qobject_cast<QNetworkReply*>(QObject::sender());
QList<float> altitudes;
_state = State::Idle;
// When an error occurs we still end up here
if (reply->error() != QNetworkReply::NoError) {
QByteArray responseBytes = reply->readAll();
QJsonParseError parseError;
QJsonDocument responseJson = QJsonDocument::fromJson(responseBytes, &parseError);
qDebug() << responseJson;
emit terrainData(false, altitudes);
return;
}
QByteArray responseBytes = reply->readAll();
QJsonParseError parseError;
QJsonDocument responseJson = QJsonDocument::fromJson(responseBytes, &parseError);
if (parseError.error != QJsonParseError::NoError) {
emit terrainData(false, altitudes);
return;
}
QJsonObject rootObject = responseJson.object();
QString status = rootObject["status"].toString();
if (status == "success") {
const QJsonArray& dataArray = rootObject["data"].toArray();
for (int i = 0; i < dataArray.count(); i++) {
altitudes.push_back(dataArray[i].toDouble());
}
emit terrainData(true, altitudes);
}
emit terrainData(false, altitudes);
}