State of the Geodata

State of the GeoData T Gridel 06-07.11.2010 | Marble Sprint

Agenda
Design Goals
Tour of the Classes
Serialisation
Model/View
Uses
Todo

GeoData Classes
Modelled after KML spec
http://code.google.com/intl/de/apis/kml/documentation/kmlreference.html
Copy-on-write features (shared data)
Data in Private D-Pointer
Copy Ctor copies Private D-Pointer
Setters trigger a deep copy of the Private
Tree features
Document
Folder
Feature
First topic – Current topic – Third Topic

Class Hierarchy

Features
Common Properties
Name
Description
Visibility
Style...
Placemarks add:
Geometry
Coordinates
Containers add:
List of Features

Geometries
Live through a Placemark
Rendered with GeometryLayer
Recursive parsing of GeoDatadocument
Rendering with GeoPainter

Styles
Limited equivalent of Qt styling
Needs marble extensions?

Serialisation
GeoDataParser API
GeoDataParser parser( GeoData_UNKNOWN );
QFile file( filename );
file.open( QIODevice::ReadOnly );
GeoDocument* document = parser.releaseDocument();
GeoDataParser Internals
GeoTagHandler and GeoStackItem
GeoTagHandler::QualifiedName qName( name().toString(), namespaceUri().toString() );
GeoStackItem stackItem( qName, 0 );
if ( const GeoTagHandler* handler = GeoTagHandler::recognizes( qName )) {
stackItem.assignNode( handler->parse( *this ));
}

Model/View
GeoDataTreeModel
Encapsulates a GeoDataDocument
Provides the Tree model for interested views
Proxies for filtered Lists (todo)
Limited use outside generic views
Model/View is signals/slots for update notification
View inherits widget, we need Layers or custom observers (PlacemarkLayout...)
Model::data() and ModelIndex suffer leaking interface syndrome

Uses (I): FileManager
Write parsing code
Serialise into a GeoDataDocument
Append to list of files
Show in a List
Enjoy ;)

Uses (II): PositionProvider
Write Position Providers
Enable Position Tracking
Store positions in a geometry
Display with GeometryLayer
Enjoy ;)

Uses (III): Routing
Write Routing query backend
Store result in a GeoDataDocument
Wrap into Routing Layer
Enjoy ;)

Todo
Use for Vector maps (Pnt files) and clean VectorMap and GeoPolygon
Full Potential of GeoPainter
Use a ProxyModel to clean the PlacemarkModel
Cure the Model diarrhea
UI for files/placemarks/visibility
Improve GeometryLayer performance
2D culling filter
Federate file loading (route restore/casual file)
Use GeoData in your pet Use Case

Thanks! techbase.kde.org/Projects/Marble/GeoData

State of the Geodata

by Marble Virtual Globe

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