[Marble-devel] Re: Rotate marble widget map

Torsten Rahn tackat at t-online.de
Wed Jun 29 11:12:46 CEST 2011

On Thursday, 30. June 2011 09:57:22 Julien Nicolas wrote:
> Hi!
> I am using marble widget to develop an application and I would like to
> know if it's currently possible to rotate the map in order to make it
> head up instead of north up?
> And if it's possible how to do this?

I think it should still be possible - but only with the spherical projection. 
IIRC there was a MarbleMap::rotateBy method at one point which took three 
parameters. For whatever reasons it seems to be gone.

But you can take the rotateBy method that takes a Quaternion: You just need to 
add the third angle: 

    Quaternion  rotPhi( 1.0, deltaLat / 180.0, 0.0, 0.0 );
    Quaternion  rotTheta( 1.0, 0.0, deltaLon / 180.0, 0.0 );
    Quaternion  rotPsi( 1.0, 0.0, 0.0, orientation );

and multiply the axis with rotPsi. For the flat maps the implementation for 
this is still missing.


> Thanks a lot for your help
> Cordially,

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