Dear Devs -- I am currently converting the transformation methods in the QGIS Georeferencer to plain C. So far, I have been able to extract and convert the projective and Helmert transformations.
However, the code for the affine transformation seems incomplete. Looking here: https://github.com/qgis/QGIS/trunk/src/plugins/georeferencer/qgsleastsquares.cpp I find this method: void QgsLeastSquares::affine() It computes a 6x6 transformation matrix but stops there. In analogy to "QgsLeastSquares::helmert()", I _think_ the next step should be to extract the rotation, scaling, translation and shearing vectors using "gsl_vector_get()". It seems to me that "QgsLeastSquares::affine()" has been abandoned code for a while and that the affine transformation is now delegated to gdal_warp(?). Does anyone here still remember how to extract the affine components from the 6x6 matrix? I have done some extensive searching on the web but came up empty. Any pointers would be greatly appreciated. Cheers, Ben _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
