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Kml reader can read country data (Note: this is not a general reader!)

This commit is contained in:
denizdiktas 2023-06-24 12:21:09 +03:00
parent ffca6656b4
commit 520083fd31
3 changed files with 119 additions and 127 deletions
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94
Arrangement_on_surface_2/demo/earth/Kml_reader.cpp
View File

@ -1,5 +1,99 @@
#include "Kml_reader.h"
#include <iostream>
#include <qfile.h>
#include <qxmlstream.h>
Kml::Placemarks Kml::read(const std::string& file_name)
{
Placemarks placemarks;
Placemark placemark;
LinearRing lring;
QFile file(file_name.c_str());
if (file.open(QIODevice::ReadOnly))
{
QXmlStreamReader xmlReader;
xmlReader.setDevice(&file);
xmlReader.readNext();
// Reading from the file
while (!xmlReader.isEndDocument())
{
QString name = xmlReader.name().toString();
if (xmlReader.isStartElement())
{
if (name == "Placemark")
{
placemark = Placemark{};
}
else if (name == "Polygon")
{
lring = LinearRing{};
}
else if (name == "LinearRing")
{
}
else if (name == "coordinates")
{
xmlReader.readNext();
auto str = xmlReader.text().toString();
auto node_strs = str.split(" ");
for (const auto& node_str : node_strs)
{
if (node_str.isEmpty())
continue;
auto coord_strs = node_str.split(",");
const auto lon = coord_strs[0].toDouble();
const auto lat = coord_strs[1].toDouble();
lring.nodes.push_back(Node{ lon, lat });
}
}
else if (name == "SimpleData")
{
auto attributes = xmlReader.attributes();
auto attr_name = attributes[0].name().toString();
auto attr_value = attributes[0].value().toString();
if ((attr_name == "name") && (attr_value == "name"))
{
xmlReader.readNext();
placemark.name = xmlReader.text().toString().toStdString();;
}
}
}
else if (xmlReader.isEndElement())
{
if (name == "Placemark")
{
placemarks.push_back(std::move(placemark));
}
else if (name == "Polygon")
{
placemark.polygons.push_back(std::move(lring));
}
else if (name == "LinearRing")
{
}
else if (name == "coordinates")
{
// no need to do anything here: the coordinates are read above!
}
}
xmlReader.readNext();
}
if (xmlReader.hasError())
{
std::cout << "XML error: " << xmlReader.errorString().data() << std::endl;
}
}
return placemarks;
}

20
Arrangement_on_surface_2/demo/earth/Kml_reader.h
View File

@ -9,7 +9,27 @@
class Kml
{
public:
struct Node
{
double lon, lat;
};
struct LinearRing
{
std::vector<Node> nodes;
};
struct Placemark
{
std::vector<LinearRing> polygons;
std::string name;
};
using Placemarks = std::vector<Placemark>;
static Placemarks read(const std::string& file_name);
};

132
Arrangement_on_surface_2/demo/earth/Main_widget.cpp
View File

@ -7,6 +7,7 @@
#include <QMouseEvent>
#include "Kml_reader.h"
#include "Geodesic_arcs.h"
#include "Tools.h"
@ -105,137 +106,14 @@ void Main_widget::timerEvent(QTimerEvent*)
update();
}
#include <qfile.h>
#include <qiodevice.h>
#include <QJsonArray.h>
#include <qjsonobject.h>
#include <QJsonParseError>
#include <qstring.h>
#include <QtXml/qdom.h>
#include <qxmlstream.h>
namespace {
struct Node
{
double lon, lat;
};
struct LinearRing
{
std::vector<Node> nodes;
};
struct MultiGeometry
{
std::vector<LinearRing> polygons;
};
struct Placemark
{
MultiGeometry geometry;
std::string name;
};
}
void Main_widget::initializeGL()
{
QString file_name("C:/work/gsoc2023/data/world_countries.kml");
{
std::vector<Placemark> placemarks;
Placemark placemark;
MultiGeometry mgeometry;
LinearRing lring;
QFile file(file_name);
if (file.open(QIODevice::ReadOnly))
{
QXmlStreamReader xmlReader;
xmlReader.setDevice(&file);
xmlReader.readNext();
// Reading from the file
while (!xmlReader.isEndDocument())
{
QString name = xmlReader.name().toString();
if (xmlReader.isStartElement())
{
if (name == "Placemark")
{
placemark = Placemark{};
}
else if (name == "MultiGeometry")
{
mgeometry = MultiGeometry{};
}
else if (name == "LinearRing")
{
lring = LinearRing{};
}
else if (name == "coordinates")
{
xmlReader.readNext();
auto str = xmlReader.text().toString();
auto node_strs = str.split(" ");
for (const auto& node_str : node_strs)
{
if (node_str.isEmpty())
continue;
auto coord_strs = node_str.split(",");
const auto lon = coord_strs[0].toDouble();
const auto lat = coord_strs[1].toDouble();
lring.nodes.push_back(Node{ lon, lat });
}
}
else if (name == "SimpleData")
{
auto attributes = xmlReader.attributes();
auto attr_name = attributes[0].name().toString();
auto attr_value = attributes[0].value().toString();
if ((attr_name == "name") && (attr_value == "name"))
{
xmlReader.readNext();
placemark.name = xmlReader.text().toString().toStdString();;
}
}
}
else if (xmlReader.isEndElement())
{
if (name == "Placemark")
{
placemarks.push_back(std::move(placemark));
}
else if (name == "MultiGeometry")
{
placemark.geometry = std::move(mgeometry);
}
else if (name == "LinearRing")
{
mgeometry.polygons.push_back(std::move(lring));
}
else if (name == "coordinates")
{
// no need to do anything here: the coordinates are read above!
}
}
xmlReader.readNext();
}
if (xmlReader.hasError())
{
std::cout << "XML error: " << xmlReader.errorString().data() << std::endl;
}
}
const auto file_name = "C:/work/gsoc2023/data/world_countries.kml";
auto countries = Kml::read(file_name);
}
initializeOpenGLFunctions();