Some custom map providers will not provide a maps for the entire world , but rather to a small area.

While there is a command line option to start marble to point to a location , it is not a feasible solution when requesting a non technical person to start with command line options (In addition to the need for asking a person to put files a directory)



Reproducible: Always

Steps to Reproduce:
1. take a dgml with a custom server that does not support world wide tiles
2. choose dgml in marble


Actual Results:  
no easy way to set the center location in the dgml.

Expected Results:  
an option to set center location in the dgml file.

From 79afd8a250b40ae76de950708a991c07b8a58853 Mon Sep 17 00:00:00 2001
From: boris <boris@bugs.local>
Date: Sat, 30 Jan 2016 13:17:09 +0200
Subject: [PATCH] lonlat from dgml

When loading a dgml file , a feature needed to center the map on a specific location.
usecase :
big boss need to see a map that will start on a custom tile server (which only show the city).
it is hard enough for an IT/dev person to ask him to download and unpack a theme file,
  asking him to run something from command line is asking for trouble.
---
 src/apps/marble-kde/KdeMainWindow.cpp              | 18 ++++++++
 src/apps/marble-kde/KdeMainWindow.h                |  1 +
 src/apps/marble-qt/QtMainWindow.cpp                | 22 +++++++++-
 src/apps/marble-qt/QtMainWindow.h                  |  1 +
 src/lib/marble/geodata/CMakeLists.txt              |  2 +
 .../geodata/handlers/dgml/DgmlCenterTagHandler.cpp | 48 ++++++++++++++++++++++
 .../geodata/handlers/dgml/DgmlCenterTagHandler.h   | 41 ++++++++++++++++++
 .../handlers/dgml/DgmlElementDictionary.cpp        |  1 +
 .../geodata/handlers/dgml/DgmlElementDictionary.h  |  1 +
 src/lib/marble/geodata/scene/GeoSceneMap.cpp       | 22 ++++++++++
 src/lib/marble/geodata/scene/GeoSceneMap.h         | 13 +++++-
 11 files changed, 168 insertions(+), 2 deletions(-)
 create mode 100644 src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.cpp
 create mode 100644 src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.h

diff --git a/src/apps/marble-kde/KdeMainWindow.cpp b/src/apps/marble-kde/KdeMainWindow.cpp
index c4fd3b1..932acf8 100644
--- a/src/apps/marble-kde/KdeMainWindow.cpp
+++ b/src/apps/marble-kde/KdeMainWindow.cpp
@@ -71,6 +71,9 @@ MainWindow::MainWindow( const QString& marbleDataPath, QWidget *parent )
 
     connect( marbleWidget(), SIGNAL(themeChanged(QString)),
             this, SLOT(setMapTitle()));
+    connect( marbleWidget(), SIGNAL(themeChanged(QString)),
+            this, SLOT(updateCenterFromTheme()));
+
 }
 
 MainWindow::~MainWindow()
@@ -97,6 +100,21 @@ void MainWindow::setMapTitle()
     }
 }
 
+void MainWindow::updateCenterFromTheme()
+{
+   //A scene provider may provide only a subset of the globe, use scene properties read from a dgml as a starting point
+   GeoSceneDocument * theme = m_controlView->marbleModel()->mapTheme(); 
+   if (theme) {
+       const GeoSceneMap* map =   theme->map();
+       if (map) {
+           const QVariantList lonLat = map->center();
+           if (! lonLat.empty()) {
+                m_controlView->marbleWidget()->centerOn( lonLat.at(0).toDouble(), lonLat.at(1).toDouble() );
+           }
+       }
+   }
+}
+
 void MainWindow::changeViewSize( QAction* action )
 {
     mDebug()<<size();
diff --git a/src/apps/marble-kde/KdeMainWindow.h b/src/apps/marble-kde/KdeMainWindow.h
index b961c6f..f0e45ac 100644
--- a/src/apps/marble-kde/KdeMainWindow.h
+++ b/src/apps/marble-kde/KdeMainWindow.h
@@ -41,6 +41,7 @@ class MainWindow : public KXmlGuiWindow
  public slots:
     void setMapTitle();
     void changeViewSize( QAction* );
+    void updateCenterFromTheme();
 
  protected:
     void closeEvent( QCloseEvent *event );
diff --git a/src/apps/marble-qt/QtMainWindow.cpp b/src/apps/marble-qt/QtMainWindow.cpp
index a0491a3..1535afc 100644
--- a/src/apps/marble-qt/QtMainWindow.cpp
+++ b/src/apps/marble-qt/QtMainWindow.cpp
@@ -65,6 +65,8 @@
 #include "NewBookmarkFolderDialog.h"
 #include "GeoSceneDocument.h"
 #include "GeoSceneHead.h"
+#include "GeoSceneMap.h"
+
 #include "GeoDataCoordinates.h"
 #include "GeoDataDocument.h"
 #include "GeoDataFolder.h"
@@ -219,6 +221,9 @@ MainWindow::MainWindow(const QString& marbleDataPath, const QVariantMap& cmdLine
              this, SLOT(updateMapEditButtonVisibility(QString)) );
     connect(m_controlView->marbleModel(), SIGNAL(themeChanged(QString)),
             this, SLOT(updateApplicationTitle(QString)));
+    connect(m_controlView->marbleModel(), SIGNAL(themeChanged(QString)),
+            this, SLOT(updateCenterFromTheme()));
+
     connect( m_controlView, SIGNAL(showMapWizard()), this, SLOT(showMapWizard()) );
     connect( m_controlView, SIGNAL(mapThemeDeleted()), this, SLOT(fallBackToDefaultTheme()) );
 
@@ -1626,6 +1631,22 @@ void MainWindow::updateApplicationTitle(const QString&)
     }
 }
 
+void MainWindow::updateCenterFromTheme()
+{
+   //A scene provider may provide only a subset of the globe, use scene properties read from a dgml as a starting point
+   GeoSceneDocument * theme = m_controlView->marbleModel()->mapTheme(); 
+   if (theme) {
+       const GeoSceneMap* map =   theme->map();
+       if (map) {
+           const QVariantList lonLat = map->center();
+           if (! lonLat.empty()) {
+                qDebug() << __FUNCTION__ << " lonlat:" << QString::number(lonLat.at(0).toDouble()) << "," << QString::number(lonLat.at(1).toDouble()) ;
+                m_controlView->marbleWidget()->centerOn( lonLat.at(0).toDouble(), lonLat.at(1).toDouble() );
+           }
+      }
+   }
+}
+
 void MainWindow::showMapWizard()
 {
     QPointer<MapWizard> mapWizard = new MapWizard();
@@ -1686,5 +1707,4 @@ void MainWindow::changeViewSize( QAction* action )
         m_savedSize.setHeight( -1 );
     }
 }
-
 #include "moc_QtMainWindow.cpp"
diff --git a/src/apps/marble-qt/QtMainWindow.h b/src/apps/marble-qt/QtMainWindow.h
index ff82641..430edb8 100644
--- a/src/apps/marble-qt/QtMainWindow.h
+++ b/src/apps/marble-qt/QtMainWindow.h
@@ -85,6 +85,7 @@ private Q_SLOTS:
     void  changeRecordingState();
 
     void  updateApplicationTitle(const QString&);
+    void  updateCenterFromTheme();
 
     // File Menu
     void  openFile();
diff --git a/src/lib/marble/geodata/CMakeLists.txt b/src/lib/marble/geodata/CMakeLists.txt
index fe0a919..20e73a1 100644
--- a/src/lib/marble/geodata/CMakeLists.txt
+++ b/src/lib/marble/geodata/CMakeLists.txt
@@ -143,6 +143,7 @@ SET ( geodata_handlers_dgml_SRCS
         geodata/handlers/dgml/DgmlThemeTagHandler.h
         geodata/handlers/dgml/DgmlSettingsTagHandler.h
         geodata/handlers/dgml/DgmlDescriptionTagHandler.h
+       geodata/handlers/dgml/DgmlCenterTagHandler.h
         geodata/handlers/dgml/DgmlBrushTagHandler.cpp
         geodata/handlers/dgml/DgmlSectionTagHandler.h
         geodata/handlers/dgml/DgmlTextureTagHandler.h
@@ -162,6 +163,7 @@ SET ( geodata_handlers_dgml_SRCS
         geodata/handlers/dgml/DgmlTileSizeTagHandler.cpp
         geodata/handlers/dgml/DgmlTextureTagHandler.cpp
         geodata/handlers/dgml/DgmlPenTagHandler.cpp
+        geodata/handlers/dgml/DgmlCenterTagHandler.cpp
         geodata/handlers/dgml/DgmlDescriptionTagHandler.cpp
         geodata/handlers/dgml/DgmlElementDictionary.h
         geodata/handlers/dgml/DgmlIconTagHandler.cpp
diff --git a/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.cpp b/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.cpp
new file mode 100644
index 0000000..8289709
--- /dev/null
+++ b/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.cpp
@@ -0,0 +1,48 @@
+/*
+    Copyright (C) 2015 Boris Shtrasman
+
+    This file is part of the KDE project
+
+    This library is free software you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    aint with this library see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "DgmlCenterTagHandler.h"
+
+#include "DgmlElementDictionary.h"
+#include "GeoParser.h"
+#include "GeoSceneMap.h"
+
+namespace Marble
+{
+namespace dgml
+{
+DGML_DEFINE_TAG_HANDLER(Center)
+
+GeoNode* DgmlCenterTagHandler::parse(GeoParser& parser) const
+{
+    // Check whether the tag is valid
+    Q_ASSERT(parser.isStartElement() && parser.isValidElement(dgmlTag_Center));
+
+    // Checking for parent item
+    GeoStackItem parentItem = parser.parentElement();
+    if (parentItem.represents(dgmlTag_Map))
+        parentItem.nodeAs<GeoSceneMap>()->setCenter( parser.readElementText().trimmed() );
+
+    return 0;
+}
+
+}
+}
diff --git a/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.h b/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.h
new file mode 100644
index 0000000..1605a74
--- /dev/null
+++ b/src/lib/marble/geodata/handlers/dgml/DgmlCenterTagHandler.h
@@ -0,0 +1,41 @@
+/*
+    Copyright (C) 2015 Boris Shtrasman
+
+    This file is part of the KDE project
+
+    This library is free software you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    aint with this library see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef MARBLE_DGML_CENTERTAGHANDLER_H
+#define MARBLE_DGML_CENTERTAGHANDLER_H
+
+#include "GeoTagHandler.h"
+
+namespace Marble
+{
+namespace dgml
+{
+
+class DgmlCenterTagHandler : public GeoTagHandler
+{
+public:
+    virtual GeoNode* parse(GeoParser&) const;
+};
+
+}
+}
+
+#endif
diff --git a/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.cpp b/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.cpp
index 96d26e3..0a83b71 100644
--- a/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.cpp
+++ b/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.cpp
@@ -34,6 +34,7 @@ const char* dgmlTag_Available = "available";
 const char* dgmlTag_Blending = "blending";
 const char* dgmlTag_Brush = "brush";
 const char* dgmlTag_Color = "color";
+const char* dgmlTag_Center = "center";
 const char* dgmlTag_CustomPlugin = "customplugin";
 const char* dgmlTag_Dem = "dem";
 const char* dgmlTag_Description = "description";
diff --git a/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.h b/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.h
index b08c3c3..1fedaf1 100644
--- a/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.h
+++ b/src/lib/marble/geodata/handlers/dgml/DgmlElementDictionary.h
@@ -36,6 +36,7 @@ namespace dgml
     extern  const char* dgmlTag_Available;
     extern  const char* dgmlTag_Blending;
     extern  const char* dgmlTag_Brush;
+    extern  const char* dgmlTag_Center;
     extern  const char* dgmlTag_Color;
     extern  const char* dgmlTag_CustomPlugin;
     extern  const char* dgmlTag_Dem;
diff --git a/src/lib/marble/geodata/scene/GeoSceneMap.cpp b/src/lib/marble/geodata/scene/GeoSceneMap.cpp
index 9b4966e..7c49508 100644
--- a/src/lib/marble/geodata/scene/GeoSceneMap.cpp
+++ b/src/lib/marble/geodata/scene/GeoSceneMap.cpp
@@ -26,6 +26,8 @@
 #include "GeoSceneFilter.h"
 #include "DgmlAuxillaryDictionary.h"
 
+#include <GeoDataCoordinates.h>
+
 namespace Marble
 {
 
@@ -50,6 +52,8 @@ class GeoSceneMapPrivate
         return GeoSceneTypes::GeoSceneMapType;
     }
 
+    QVariantList  m_center;
+
     /// The vector holding all the sections in the legend.
     /// (We want to preserve the order and don't care 
     /// much about speed here), so we don't use a hash
@@ -166,6 +170,24 @@ void GeoSceneMap::addFilter( GeoSceneFilter* filter )
     }
 }
 
+QVariantList GeoSceneMap::center() const
+{
+  return d->m_center;
+}
+
+void GeoSceneMap::setCenter(const QString & coordinatesString)
+{
+  bool success = false;
+  const GeoDataCoordinates coordinates = GeoDataCoordinates::fromString(coordinatesString, success);
+
+  if ( success ) {
+      QVariantList lonLat;
+      lonLat << QVariant( coordinates.longitude(GeoDataCoordinates::Degree) )
+             << QVariant( coordinates.latitude(GeoDataCoordinates::Degree) );
+      d->m_center = lonLat;
+  }
+}
+
 GeoSceneFilter* GeoSceneMap::filter( const QString& name )
 {
     GeoSceneFilter* filter = 0;
diff --git a/src/lib/marble/geodata/scene/GeoSceneMap.h b/src/lib/marble/geodata/scene/GeoSceneMap.h
index 42db5b4..f01b387 100644
--- a/src/lib/marble/geodata/scene/GeoSceneMap.h
+++ b/src/lib/marble/geodata/scene/GeoSceneMap.h
@@ -25,6 +25,7 @@
 #include <QColor>
 #include <QString>
 #include <QVector>
+#include <QVariant>
 
 #include <geodata_export.h>
 
@@ -64,7 +65,17 @@ class GEODATA_EXPORT GeoSceneMap : public GeoNode
      * @param  section  The new layer
      */
     void addLayer( GeoSceneLayer* );
-
+    /**
+     * @ brief Set starting center with lon lat cooredinates
+     * used if a scene downloadUrl do not handle elements in other locations
+     */
+    void setCenter(const QString & coordinateString);
+    /**
+     * @breif Get starting center with cooredinates
+     * used if a scene downloadUrl do not handle elements in other locations
+     * return A QVariantList of lon lat as specified in the dgml
+     */
+    QVariantList center() const;
     /**
      * @brief  Return a layer by its name
      * @param  name  The name of the layer
-- 
2.7.0