In the view IGT Navigation Tool Calibration of plugin org.mitk.gui.qt.igttracking you can set a tooltip manually. However, in the popup window only integer values are supported. Setting double or at least float values would make more sense to be able to set tool tips with sub-millimeter accuracy.
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This can be changed in the class QmitkInteractivTransformationWidget of the module IGTUI. The problem there is, that QSliders are used to modify the tooltip. By default, QSliders only support integers. The UI is the only problem, the data structures (mitk::Vector3D in this case) already support double precision. See line 128 of QmitkInteractivTransformationWidget.cpp for example.
We can remove the QSliders and only use spin boxes instead. Or: Ideas how to use QSliders with float/doubles might be found here:
https://stackoverflow.com/questions/19003369/how-to-make-a-qslider-change-with-double-values
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