60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
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# ifndef SR_TRACKBALL_H
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# define SR_TRACKBALL_H
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/** \file sr_trackball.h
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* trackball manipulation
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*/
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# include "sr_vec.h"
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# include "sr_quat.h"
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class SrMat;
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/*! \class SrTrackball sr_trackball.h
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\brief trackball manipulation
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SrTrackball maintains a rotation with methods implementing a
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trackball-like manipulations, and etc. */
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class SrTrackball
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{ public :
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SrQuat rotation; //!< current rotation
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SrQuat last_spin;
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public :
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/*! Initialize the trackball with the default parameters, see init(). */
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SrTrackball ();
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/*! Copy constructor. */
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SrTrackball ( const SrTrackball& t );
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/*! Set the parameters to their default values, which is a null rotation. */
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void init ();
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/*! Set m to be the equivalent transformation matrix. A reference to m
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is returned. */
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SrMat& get_mat ( SrMat& m ) const;
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/*! Gets the rotation induced by a mouse displacement,
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according to the trackball metaphor. Window coordinates must be
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normalized in [-1,1]x[-1,1]. */
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static void get_spin_from_mouse_motion ( float lwinx, float lwiny, float winx, float winy, SrQuat& spin );
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/*! Accumulates the rotation induced by a mouse displacement,
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according to the trackball metaphor. Window coordinates must be
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normalized in [-1,1]x[-1,1]. */
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void increment_from_mouse_motion ( float lwinx, float lwiny, float winx, float winy );
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/*! Accumulates the rotation with the given quaternion (left-multiplied) */
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void increment_rotation ( const SrQuat& spin );
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/*! Outputs trackball data for inspection. */
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friend SrOutput& operator<< ( SrOutput& out, const SrTrackball& tb );
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};
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//================================ End of File =================================================
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# endif // SR_TRACKBALL_H
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