add layer that displays points of interest from a .osm file

TODO: draw different icons

main.cpp

@@ -28,7 +28,7 @@ int main(int argc, char *argv[])
     MainWidget w;
 
     if (QApplication::arguments().count() > 1) {
-        w.loadGpx(QApplication::arguments().at(1));
+        w.loadFile(QApplication::arguments().at(1));
     }
 
     QObject::connect(&w, SIGNAL(close()), &a, SLOT(quit()));

mainwidget.cpp

@@ -28,6 +28,7 @@
 #include "gpslayer.h"
 #include "gpxlayer.h"
 #include "markerlayer.h"
+#include "poilayer.h"
 #include "timelayer.h"
 
 #include <QtCore/QDir>
@@ -88,12 +89,16 @@ MainWidget::~MainWidget()
 {
 }
 
-void MainWidget::loadGpx(const QString &fileName)
+void MainWidget::loadFile(const QString &fileName)
 {
     if (fileName.endsWith(".gpx")) {
         AbstractLayer *l = new GpxLayer(m_map);
         l->load(fileName);
         m_map->addLayer(l, 2, "GPS-Track");
+    } else if (fileName.endsWith(".osm")) {
+        AbstractLayer *l = new PoiLayer(m_map);
+        l->load(fileName);
+        m_map->addLayer(l, 3, "Points Of Interest");
     }
 }
 

mainwidget.h

@@ -36,7 +36,7 @@ public:
     MainWidget(QWidget *parent = 0);
     ~MainWidget();
 
-    void loadGpx(const QString &fileName);
+    void loadFile(const QString &fileName);
 
 signals:
     void close();

poilayer.cpp

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2010  Niels Kummerfeldt <niels.kummerfeldt@tu-harburg.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA
+ */
+
+#include "poilayer.h"
+
+#include "mapwidget.h"
+#include "projection.h"
+
+#include <QtCore/QFile>
+#include <QtXml/QXmlStreamReader>
+
+PoiLayer::PoiLayer(MapWidget *map) :
+    AbstractLayer(map),
+    m_points(),
+    m_pointsOnScreen(),
+    m_icons(),
+    m_pointsOffset(0, 0)
+{
+}
+
+void PoiLayer::load(const QString &filename)
+{
+    QFile file(filename);
+    if (file.open(QIODevice::ReadOnly)) {
+        QXmlStreamReader xml(&file);
+
+        QStringList categories;
+        categories << "highway";
+        categories << "traffic_calming";
+        categories << "barrier";
+        categories << "waterway";
+        categories << "railway";
+        categories << "aeroway";
+        categories << "aerialway";
+        categories << "power";
+        categories << "man_made";
+        categories << "leisure";
+        categories << "amenity";
+        categories << "office";
+        categories << "shop";
+        categories << "craft";
+        categories << "emergency";
+        categories << "tourism";
+        categories << "historic";
+        categories << "landuse";
+        categories << "military";
+        categories << "natural";
+        categories << "geological";
+        categories << "sport";
+
+        QHash<QString, QString> tags;
+        QPointF pos;
+        while (!xml.atEnd()) {
+            xml.readNext();
+            if (xml.isStartElement()) {
+                if (xml.name() == "node") {
+                    float lat = xml.attributes().value("lat").toString().toFloat();
+                    float lon = xml.attributes().value("lon").toString().toFloat();
+
+                    pos = QPointF(Projection::lon2rawx(lon), Projection::lat2rawy(lat));
+                } else if (xml.name() == "tag") {
+                    tags.insert(xml.attributes().value("k").toString(), 
+                                xml.attributes().value("v").toString());
+                }
+            } else if (xml.isEndElement()) {
+                if (xml.name() == "node") {
+                    foreach (const QString &c, categories) {
+                        QString t = tags.value(c, "");
+                        if (!t.isEmpty()) {
+                            m_points << pos;
+                            m_icons << t;
+                            break;
+                        }
+                    }
+                    tags.clear();
+                }
+            }
+        }
+        zoom(0);
+    }
+}
+
+void PoiLayer::zoom(int level)
+{
+    if (m_points.count() > 1) {
+        int scale = 1 << level;
+        m_pointsOnScreen.clear();
+        m_pointsOffset = map()->raw2screen(m_points.first().x(), m_points.first().y(), scale);
+        m_pointsOnScreen << QPoint(0, 0);
+        for (int i = 1; i < m_points.count(); ++i) {
+            QPointF p = m_points.at(i);
+            m_pointsOnScreen << map()->raw2screen(p.x(), p.y(), scale) - m_pointsOffset;
+        }
+    }
+}
+
+void PoiLayer::pan(const QPoint &move)
+{
+    m_pointsOffset += move;
+}
+
+void PoiLayer::paint(QPainter *painter)
+{
+    QPoint p;
+    for (int i = 0; i < m_pointsOnScreen.count(); ++i) {
+        p = m_pointsOnScreen.at(i);
+        painter->drawEllipse(p + m_pointsOffset, 5, 5);
+    }
+}
+

poilayer.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2010  Niels Kummerfeldt <niels.kummerfeldt@tu-harburg.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA
+ */
+
+#ifndef POI_LAYER_H
+#define POI_LAYER_H
+
+#include "abstractlayer.h"
+
+#include <QtGui/QPainter>
+
+class PoiLayer : public AbstractLayer
+{
+    Q_OBJECT
+public:
+    PoiLayer(MapWidget *map);
+
+    virtual void load(const QString &filename);
+    virtual void zoom(int level);
+    virtual void pan(const QPoint &move);
+
+protected:
+    virtual void paint(QPainter *painter);
+
+private:
+    QList<QPointF> m_points;
+    QList<QPoint> m_pointsOnScreen;
+    QStringList m_icons;
+    QPoint m_pointsOffset;
+
+};
+
+#endif // POI_LAYER_H