[Marble-devel] Review Request 118751: Spherical interpolation methods in GeoDataCoordinates

[Commit Hook]

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This review has been submitted with commit 76fed5d77e20a42f23c327b2a2e3f4a1cf36d147 by Dennis Nienhüser to branch master.

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On June 15, 2014, 11:18 a.m., Dennis Nienhüser wrote:
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> https://git.reviewboard.kde.org/r/118751/
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> (Updated June 15, 2014, 11:18 a.m.)
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> 
> Review request for Marble and Torsten Rahn.
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> Repository: marble
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> Description
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> - adds a method slerp() to GeoDataCoordinates for spherical linear interpolation. Merely a convenience one for the existing Quaternion::slerp()
> - adds a method squad() to GeoDataCoordinates for spherical spline interpolation. Based on the work of Ken Shoemake, implemented according to Erik B. Dam, Martin Koch, Martin Lillholm. Quaternions, Interpolation and Animation, page 51, http://web.mit.edu/2.998/www/QuaternionReport1.pdf
> - adds an example in examples/cpp/squad-interpolation which picks nearby cities from Marble's internal city database at random and interpolates paths between them. See screenshot and the video at http://nienhueser.de/marble/marble-squad-interpolation.html (plays in your browser)
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> squad will become useful to animate the camera path in KML Tour playback.
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> Food for thoughts/discussion:
> - Is the current signature GeoDataCoordinates::squad(GC a, b, c, double t) better than a static one GeoDataCoordinates::squad(GC a, b, c, d, double t)?
> - Shall we move it elsewhere? Imho GeoDataCoordinates is a better fit than e.g. MarblePhysics or GeoDataLineString
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> 
> Diffs
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>   examples/cpp/CMakeLists.txt f7075cc 
>   examples/cpp/squad-interpolation/CMakeLists.txt PRE-CREATION 
>   examples/cpp/squad-interpolation/squad-interpolation.h PRE-CREATION 
>   examples/cpp/squad-interpolation/squad-interpolation.cpp PRE-CREATION 
>   src/lib/marble/geodata/data/GeoDataCoordinates.h 89fba28 
>   src/lib/marble/geodata/data/GeoDataCoordinates.cpp 2d2c117 
>   src/lib/marble/geodata/data/GeoDataCoordinates_p.h 2d81e5e 
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> Diff: https://git.reviewboard.kde.org/r/118751/diff/
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> Testing
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> File Attachments
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> squad example
>   https://git.reviewboard.kde.org/media/uploaded/files/2014/06/14/2c98d4b4-129f-4da6-905e-a5b0eb938aa4__marble-squad-interpolation-1.png
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> Thanks,
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> Dennis Nienhüser
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