Don Gagne
8 years ago
10 changed files with 293 additions and 34 deletions
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/****************************************************************************
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* |
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* (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
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* |
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* QGroundControl is licensed according to the terms in the file |
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* COPYING.md in the root of the source code directory. |
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* |
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****************************************************************************/ |
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#include "Terrain.h" |
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#include <QUrl> |
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#include <QUrlQuery> |
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#include <QNetworkRequest> |
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#include <QNetworkProxy> |
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#include <QNetworkReply> |
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#include <QJsonDocument> |
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#include <QJsonObject> |
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#include <QJsonArray> |
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ElevationProvider::ElevationProvider(QObject* parent) |
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: QObject(parent) |
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{ |
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} |
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bool ElevationProvider::queryTerrainData(const QList<QGeoCoordinate>& coordinates) |
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{ |
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if (_state != State::Idle || coordinates.length() == 0) { |
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return false; |
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} |
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QUrlQuery query; |
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QString points = ""; |
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for (const auto& coordinate : coordinates) { |
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points += QString::number(coordinate.latitude(), 'f', 10) + "," |
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+ QString::number(coordinate.longitude(), 'f', 10) + ","; |
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} |
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points = points.mid(0, points.length() - 1); // remove the last ','
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query.addQueryItem(QStringLiteral("points"), points); |
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QUrl url(QStringLiteral("https://api.airmap.com/elevation/stage/srtm1/ele")); |
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url.setQuery(query); |
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QNetworkRequest request(url); |
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QNetworkProxy tProxy; |
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tProxy.setType(QNetworkProxy::DefaultProxy); |
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_networkManager.setProxy(tProxy); |
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QNetworkReply* networkReply = _networkManager.get(request); |
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if (!networkReply) { |
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return false; |
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} |
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connect(networkReply, &QNetworkReply::finished, this, &ElevationProvider::_requestFinished); |
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_state = State::Downloading; |
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return true; |
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} |
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void ElevationProvider::_requestFinished() |
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{ |
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QNetworkReply* reply = qobject_cast<QNetworkReply*>(QObject::sender()); |
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QList<float> altitudes; |
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_state = State::Idle; |
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// When an error occurs we still end up here
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if (reply->error() != QNetworkReply::NoError) { |
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QByteArray responseBytes = reply->readAll(); |
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QJsonParseError parseError; |
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QJsonDocument responseJson = QJsonDocument::fromJson(responseBytes, &parseError); |
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qDebug() << responseJson; |
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emit terrainData(false, altitudes); |
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return; |
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} |
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QByteArray responseBytes = reply->readAll(); |
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QJsonParseError parseError; |
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QJsonDocument responseJson = QJsonDocument::fromJson(responseBytes, &parseError); |
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if (parseError.error != QJsonParseError::NoError) { |
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emit terrainData(false, altitudes); |
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return; |
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} |
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QJsonObject rootObject = responseJson.object(); |
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QString status = rootObject["status"].toString(); |
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if (status == "success") { |
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const QJsonArray& dataArray = rootObject["data"].toArray(); |
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for (int i = 0; i < dataArray.count(); i++) { |
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altitudes.push_back(dataArray[i].toDouble()); |
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} |
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emit terrainData(true, altitudes); |
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} |
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emit terrainData(false, altitudes); |
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} |
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@ -0,0 +1,55 @@ |
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/****************************************************************************
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* |
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* (c) 2017 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
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* |
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* QGroundControl is licensed according to the terms in the file |
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* COPYING.md in the root of the source code directory. |
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* |
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****************************************************************************/ |
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#pragma once |
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#include <QObject> |
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#include <QGeoCoordinate> |
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#include <QNetworkAccessManager> |
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/* usage example:
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ElevationProvider *p = new ElevationProvider(); |
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QList<QGeoCoordinate> coordinates; |
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QGeoCoordinate c(47.379243, 8.548265); |
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coordinates.push_back(c); |
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c.setLatitude(c.latitude()+0.01); |
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coordinates.push_back(c); |
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p->queryTerrainData(coordinates); |
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*/ |
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class ElevationProvider : public QObject |
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{ |
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Q_OBJECT |
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public: |
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ElevationProvider(QObject* parent = NULL); |
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/**
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* Async elevation query for a list of lon,lat coordinates. When the query is done, the terrainData() signal |
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* is emitted. |
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* @param coordinates |
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* @return true on success |
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*/ |
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bool queryTerrainData(const QList<QGeoCoordinate>& coordinates); |
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signals: |
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void terrainData(bool success, QList<float> altitudes); |
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private slots: |
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void _requestFinished(); |
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private: |
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enum class State { |
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Idle, |
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Downloading, |
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}; |
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State _state = State::Idle; |
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QNetworkAccessManager _networkManager; |
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}; |
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