DonLakeFlyer
7 years ago
22 changed files with 454 additions and 158 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 "KMLFileHelper.h" |
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#include <QFile> |
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QDomDocument KMLFileHelper::loadFile(const QString& kmlFile, QString& errorString) |
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{ |
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QFile file(kmlFile); |
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errorString.clear(); |
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if (!file.exists()) { |
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errorString = tr("File not found: %1").arg(kmlFile); |
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return QDomDocument(); |
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} |
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if (!file.open(QIODevice::ReadOnly)) { |
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errorString = tr("Unable to open file: %1 error: $%2").arg(kmlFile).arg(file.errorString()); |
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return QDomDocument(); |
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} |
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QDomDocument doc; |
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QString errorMessage; |
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int errorLine; |
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if (!doc.setContent(&file, &errorMessage, &errorLine)) { |
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errorString = tr("Unable to parse KML file: %1 error: %2 line: %3").arg(kmlFile).arg(errorMessage).arg(errorLine); |
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return QDomDocument(); |
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} |
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return doc; |
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} |
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QVariantList KMLFileHelper::determineFileContents(const QString& kmlFile) |
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{ |
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QString errorString; |
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KMLFileContents fileContents = determineFileContents(kmlFile, errorString); |
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QVariantList varList; |
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varList.append(QVariant::fromValue(fileContents)); |
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varList.append(QVariant::fromValue(errorString)); |
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return varList; |
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} |
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KMLFileHelper::KMLFileContents KMLFileHelper::determineFileContents(const QString& kmlFile, QString& errorString) |
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{ |
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QDomDocument domDocument = KMLFileHelper::loadFile(kmlFile, errorString); |
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if (!errorString.isEmpty()) { |
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return Error; |
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} |
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QDomNodeList rgNodes = domDocument.elementsByTagName("Polygon"); |
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if (rgNodes.count()) { |
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return Polygon; |
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} |
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rgNodes = domDocument.elementsByTagName("LineString"); |
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if (rgNodes.count()) { |
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return Polyline; |
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} |
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errorString = tr("No known type found in KML file."); |
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return Error; |
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} |
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bool KMLFileHelper::loadPolygonFromFile(const QString& kmlFile, QList<QGeoCoordinate>& vertices, QString& errorString) |
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{ |
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errorString.clear(); |
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vertices.clear(); |
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QDomDocument domDocument = KMLFileHelper::loadFile(kmlFile, errorString); |
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if (!errorString.isEmpty()) { |
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return false; |
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} |
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QDomNodeList rgNodes = domDocument.elementsByTagName("Polygon"); |
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if (rgNodes.count() == 0) { |
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errorString = tr("Unable to find Polygon node in KML"); |
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return false; |
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} |
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QDomNode coordinatesNode = rgNodes.item(0).namedItem("outerBoundaryIs").namedItem("LinearRing").namedItem("coordinates"); |
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if (coordinatesNode.isNull()) { |
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errorString = tr("Internal error: Unable to find coordinates node in KML"); |
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return false; |
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} |
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QString coordinatesString = coordinatesNode.toElement().text().simplified(); |
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QStringList rgCoordinateStrings = coordinatesString.split(" "); |
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QList<QGeoCoordinate> rgCoords; |
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for (int i=0; i<rgCoordinateStrings.count()-1; i++) { |
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QString coordinateString = rgCoordinateStrings[i]; |
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QStringList rgValueStrings = coordinateString.split(","); |
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QGeoCoordinate coord; |
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coord.setLongitude(rgValueStrings[0].toDouble()); |
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coord.setLatitude(rgValueStrings[1].toDouble()); |
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rgCoords.append(coord); |
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} |
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// Determine winding, reverse if needed
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double sum = 0; |
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for (int i=0; i<rgCoords.count(); i++) { |
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QGeoCoordinate coord1 = rgCoords[i]; |
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QGeoCoordinate coord2 = (i == rgCoords.count() - 1) ? rgCoords[0] : rgCoords[i+1]; |
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sum += (coord2.longitude() - coord1.longitude()) * (coord2.latitude() + coord1.latitude()); |
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} |
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bool reverse = sum < 0.0; |
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if (reverse) { |
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QList<QGeoCoordinate> rgReversed; |
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for (int i=0; i<rgCoords.count(); i++) { |
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rgReversed.prepend(rgCoords[i]); |
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} |
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rgCoords = rgReversed; |
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} |
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vertices = rgCoords; |
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return true; |
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} |
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bool KMLFileHelper::loadPolylineFromFile(const QString& kmlFile, QList<QGeoCoordinate>& coords, QString& errorString) |
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{ |
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errorString.clear(); |
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coords.clear(); |
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QDomDocument domDocument = KMLFileHelper::loadFile(kmlFile, errorString); |
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if (!errorString.isEmpty()) { |
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return false; |
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} |
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QDomNodeList rgNodes = domDocument.elementsByTagName("LineString"); |
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if (rgNodes.count() == 0) { |
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errorString = tr("Unable to find LineString node in KML"); |
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return false; |
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} |
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QDomNode coordinatesNode = rgNodes.item(0).namedItem("coordinates"); |
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if (coordinatesNode.isNull()) { |
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errorString = tr("Internal error: Unable to find coordinates node in KML"); |
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return false; |
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} |
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QString coordinatesString = coordinatesNode.toElement().text().simplified(); |
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QStringList rgCoordinateStrings = coordinatesString.split(" "); |
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QList<QGeoCoordinate> rgCoords; |
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for (int i=0; i<rgCoordinateStrings.count()-1; i++) { |
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QString coordinateString = rgCoordinateStrings[i]; |
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QStringList rgValueStrings = coordinateString.split(","); |
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QGeoCoordinate coord; |
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coord.setLongitude(rgValueStrings[0].toDouble()); |
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coord.setLatitude(rgValueStrings[1].toDouble()); |
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rgCoords.append(coord); |
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} |
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coords = rgCoords; |
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return true; |
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} |
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@ -0,0 +1,37 @@
@@ -0,0 +1,37 @@
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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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#pragma once |
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#include <QObject> |
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#include <QDomDocument> |
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#include <QList> |
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#include <QGeoCoordinate> |
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/// The QGCMapPolygon class provides a polygon which can be displayed on a map using a map visuals control.
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/// It maintains a representation of the polygon on QVariantList and QmlObjectListModel format.
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class KMLFileHelper : public QObject |
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{ |
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Q_OBJECT |
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public: |
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enum KMLFileContents { |
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Polygon, |
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Polyline, |
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Error |
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}; |
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Q_ENUM(KMLFileContents) |
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Q_INVOKABLE static QVariantList determineFileContents(const QString& kmlFile); |
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static KMLFileContents determineFileContents(const QString& kmlFile, QString& errorString); |
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static QDomDocument loadFile(const QString& kmlFile, QString& errorString); |
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static bool loadPolygonFromFile(const QString& kmlFile, QList<QGeoCoordinate>& vertices, QString& errorString); |
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static bool loadPolylineFromFile(const QString& kmlFile, QList<QGeoCoordinate>& coords, QString& errorString); |
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}; |
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