[Marble-devel] marble plugin capabilities (correct Url for the drawing video)

Torsten Rahn tackat at t-online.de
Tue May 29 10:21:49 UTC 2012

Just a small correction regarding the annotation video:

On Dienstag, 29. Mai 2012 12:14:17 Torsten Rahn wrote:
> Hi David,
> On Dienstag, 29. Mai 2012 09:54:33 David Delbecq wrote:
> Yes, this is possible. We had a project even inside Marble which created a
> prototype for this kind of functionality.
> See
> http://www.youtube.com/watch?v=hTKc546-gjQ

This wasn't the video I meant to show. The correct Url is:


This shows a polygon and placemark dynamically created by the user inside 

> The source code for this project is located here (currently disabled from
> compilation so it might require some minor code changes to get it compiling
> again):
> marble/src/plugins/render/osmannotate/
> > We plan to store data in kml file, with additionnal
> > information in a <ExtendedData> + custom xml namespace. Does marble
> > provide a way to expose this information to our application / let our
> > application create or edit those, or will we have to handle ourself the
> > load / save process of our kml files?
> The Marble library provides basic support for KML loading: This includes
> all the basic KML elements (Documents, Placemarks, Geometries, Styles,
> ExtendedData),  - except for fancy stuff such as Animations/Tours, 3D
> Models / COLLADA files and GroundOverlays which are not implemented yet.
> You can check the capabilities by importing a KML file using the normal
> Marble Virtual Globe client. If it displays your KML file fine then the
> library will do as well.
> You can load the KML files via a single API call into Marble's model:
> http://techbase.kde.org/Projects/Marble/Runners/Parse
> Internally Marble's whole data structure is modelled after KML, so you can
> also access the objects loaded into the model via C++ code. And you can
> even create new ones via C++:
> http://techbase.kde.org/Projects/Marble/Runners/DisplayGeoDataPlacemark
> > - Can the component be used "off
> > screen" for pure rendering work (generate pictures out of kml files) ? -
> Yes, this should be possible. If you just use "MarbleMap" (that is the
> class that is used by MarbleWidget to draw the map) then everything is
> completely "off-screen" in every kind of sense.
> > Is there a qt-jambi version of the librairy?
> There is an initial version of Qt Jambi bindings but these are certainly
> outdated:
> http://old.qt-jambi.org/marble-map-widget-as-a-generator-example/
> http://qt.gitorious.org/qt-jambi/old-community-
> repo/blobs/bd785bd6117760fc862ac282dbe99bdfea01971f/examples/generator/marb
> le/scripts/build.xml
> Getting these to work will certainly require some work. Note that most
> developers in the Marble community use Marble's C++ framework, so the
> existing support for bindings such as Python, Jambi, etc. is very much
> experimental.
> > - Is there some "benchmark" application based on marble that would help
> > us decide of computers we plan to use are fast enough to render marble
> > datas?
> There is no benchmark suite that would cover all features of Marble.  But
> in doubt you could try to simply install the Marble application on your
> target system for a quick survey.
> Usually for Desktop PCs there should be no problem with performance.
> For embedded hardware it depends:
> Marble doesn't make use of OpenGL yet. Instead it renders everything in
> software. This has the advantage that it renders everything equally on
> every kind of hardware that supports Qt. But this also means that on weak
> embedded hardware running the globe projection might be heavy on your
> hardware and might lead to relatively bad performance.
> Instead you might want to use Marble's Mercator projection which delivers
> excellent speed for map themes that use mercator-based tile data (such as
> OpenStreetMap, Google  Maps, Nokia Maps, etc.). If you want to target
> embedded hardware you might want to have a look at the optimizations we do
> for our ARM based Marble Nokia N900 packages.
> For a general overview of the features or Marble Virtual Globe (which are
> also supported by the library) please have a look at
> http://www.slideshare.net/marbleglobe/marble-virtual-globe-13-factsheet-
> english
> For an overview about Marble's library please have a look at:
> http://www.slideshare.net/marbleglobe/marble-for-developers-factsheet
> Finally I'd like to point out that there is community support as well as
> commercial support available for Marble:
> http://edu.kde.org/marble/support.php
> Best Regards,
> Torsten
> > Thank you,
> > 
> > David Delbecq
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