Added DEM data overview

src/GUI/gui.cpp

@@ -384,6 +384,9 @@ void GUI::createActions()
 	_downloadDEMAction->setEnabled(false);
 	_downloadDEMAction->setShortcut(DOWNLOAD_DEM_SHORTCUT);
 	connect(_downloadDEMAction, &QAction::triggered, this, &GUI::downloadDEM);
+	_showDEMTilesAction = new QAction(tr("Show local DEM tiles"));
+	_showDEMTilesAction->setMenuRole(QAction::NoRole);
+	connect(_showDEMTilesAction, &QAction::triggered, this, &GUI::showDEMTiles);
 
 	// Graph actions
 	_showGraphsAction = new QAction(QIcon(SHOW_GRAPHS_ICON), tr("Show graphs"),
@@ -595,7 +598,7 @@ void GUI::createMenus()
 	_poiMenu->addAction(_showPOIAction);
 
 	QMenu *demMenu = menuBar()->addMenu(tr("DEM"));
-	demMenu->addSeparator();
+	demMenu->addAction(_showDEMTilesAction);
 	demMenu->addAction(_downloadDEMAction);
 
 	QMenu *settingsMenu = menuBar()->addMenu(tr("&Settings"));
@@ -1730,6 +1733,14 @@ void GUI::demLoaded()
 	reloadFiles();
 }
 
+void GUI::showDEMTiles()
+{
+	_mapView->loadDEMs(DEM::tiles());
+
+	_fileActionGroup->setEnabled(true);
+	_reloadFileAction->setEnabled(false);
+}
+
 void GUI::updateStatusBarInfo()
 {
 	if (_files.count() == 0)

src/GUI/gui.h

@@ -76,6 +76,7 @@ private slots:
 	void openOptions();
 	void clearMapCache();
 	void downloadDEM();
+	void showDEMTiles();
 
 	void mapChanged(QAction *action);
 	void graphChanged(int);
@@ -234,6 +235,7 @@ private:
 	QAction *_showCoordinatesAction;
 	QAction *_openOptionsAction;
 	QAction *_downloadDEMAction;
+	QAction *_showDEMTilesAction;
 	QAction *_mapsEnd;
 	QAction *_poisEnd;
 

src/GUI/mapview.cpp

@@ -293,6 +293,23 @@ void MapView::loadMaps(const QList<MapAction *> &maps)
 	centerOn(contentCenter());
 }
 
+void MapView::loadDEMs(const QList<Area> &dems)
+{
+	int zoom = _map->zoom();
+
+	for (int i = 0; i < dems.size(); i++)
+		addArea(dems.at(i));
+
+	if (fitMapZoom() != zoom)
+		rescale();
+	else
+		updatePOIVisibility();
+
+	updateZValues(_areas);
+
+	centerOn(contentCenter());
+}
+
 int MapView::fitMapZoom() const
 {
 	RectC br = _tr | _rr | _wr | _ar;

src/GUI/mapview.h

@@ -52,6 +52,7 @@ public:
 
 	QList<PathItem *> loadData(const Data &data);
 	void loadMaps(const QList<MapAction*> &maps);
+	void loadDEMs(const QList<Area> &dems);
 
 	void setPalette(const Palette &palette);
 	void setPOI(POI *poi);

src/data/dem.cpp

@@ -15,6 +15,7 @@
 #include <QtMath>
 #include <QDir>
 #include <QFile>
+#include <QRegularExpression>
 #include <private/qzipreader_p.h>
 #include "common/rectc.h"
 #include "dem.h"
@@ -138,6 +139,36 @@ qreal DEM::elevation(const Coordinates &c)
 		return height(c, ba);
 }
 
+QList<Area> DEM::tiles()
+{
+	QDir dir(_dir);
+	QFileInfoList files(dir.entryInfoList(QDir::Files | QDir::Readable));
+	QRegularExpression re("([NS])([0-9]{2})([EW])([0-9]{3})");
+	QList<Area> list;
+
+	for (int i = 0; i < files.size(); i++) {
+		QString basename(files.at(i).baseName());
+		QRegularExpressionMatch match(re.match(basename));
+		if (!match.hasMatch())
+			continue;
+
+		int lat = match.captured(2).toInt();
+		int lon = match.captured(4).toInt();
+		if (match.captured(1) == "S")
+			lat = -lat;
+		if (match.captured(3) == "W")
+			lon = -lon;
+
+		Area area(RectC(Coordinates(lon, lat + 1), Coordinates(lon + 1, lat)));
+		area.setName(basename);
+		area.setDescription(files.at(i).canonicalFilePath());
+
+		list.append(area);
+	}
+
+	return list;
+}
+
 #ifndef QT_NO_DEBUG
 QDebug operator<<(QDebug dbg, const DEM::Tile &tile)
 {

src/data/dem.h

@@ -5,6 +5,7 @@
 #include <QCache>
 #include <QByteArray>
 #include "common/config.h"
+#include "area.h"
 
 class QString;
 class Coordinates;
@@ -37,6 +38,8 @@ public:
 	static void clearCache();
 	static qreal elevation(const Coordinates &c);
 
+	static QList<Area> tiles();
+
 private:
 	static QString fileName(const QString &baseName);