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/**
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* @file QuatTrackBall.h
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* @brief Quaternion based track ball.
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*/
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/* ----------------------------------------------------------------------- *
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* This file is part of GEL, http://www.imm.dtu.dk/GEL
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* Copyright (C) the authors and DTU Informatics
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* For license and list of authors, see ../../doc/intro.pdf
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* ----------------------------------------------------------------------- */
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#ifndef __GLGRAPHICS_TrackBall_H__
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#define __GLGRAPHICS_TrackBall_H__
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#include "../CGLA/Vec2i.h"
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#include "../CGLA/Vec2f.h"
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#include "../CGLA/Vec3f.h"
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#include "../CGLA/Vec3Hf.h"
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#include "../CGLA/Quatf.h"
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namespace GLGraphics
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{
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enum TrackBallAction
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{
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NO_ACTION = 0,
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ROTATE_ACTION,
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PAN_ACTION,
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ZOOM_ACTION
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};
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/** \brief This class represents a virtual tracball.
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Use it in GLUT, FLTK or other OpenGL programs to allow the user to
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spin the model being rendered. It needs work to be used with non-GL
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apps since it calls GL API functions. */
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class QuatTrackBall
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{
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CGLA::Vec3f centre;
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CGLA::Vec2i screen_centre;
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unsigned width, height;
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CGLA::Quatf qrot;
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CGLA::Quatf qinc;
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CGLA::Vec2f trans;
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float scale;
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float ballsize;
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float eye_dist;
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CGLA::Vec2f last_pos;
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TrackBallAction current_action;
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void rotate(const CGLA::Vec2f&);
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void pan(const CGLA::Vec2f&);
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void zoom(const CGLA::Vec2f&);
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void calcRotation(const CGLA::Vec2f&);
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float projectToSphere(const CGLA::Vec2f&);
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CGLA::Vec2f scalePoint(const CGLA::Vec2i&) const;
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void set_position(const CGLA::Vec2f&);
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public:
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/** First constructor argument is the point we look at.
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The second argument is the distance to eye point.
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The third is the scaling factor
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the last two arguments are the window dimensions. */
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QuatTrackBall(const CGLA::Vec3f&, float, unsigned, unsigned);
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/// Set window dimensions.
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void set_screen_window(unsigned _width, unsigned _height)
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{
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width = _width;
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height = _height;
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screen_centre[0] = static_cast<int>(width/2.0f);
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screen_centre[1] = static_cast<int>(height/2.0f);
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}
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/// set the centre point of rotation
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void set_centre(const CGLA::Vec3f& _centre)
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{
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centre = _centre;
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}
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void set_screen_centre(const CGLA::Vec2i& _screen_centre)
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{
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screen_centre[0] = _screen_centre[0];
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screen_centre[1] = height - _screen_centre[1];
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}
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const CGLA::Quatf& get_rotation() const
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{
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return qrot;
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}
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void set_rotation(const CGLA::Quatf& _qrot)
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{
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qrot = _qrot;
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}
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void set_eye_dist(float _eye_dist)
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{
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eye_dist = _eye_dist;
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}
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float get_eye_dist() const
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{
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return eye_dist;
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}
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/// Call GL to set up viewing.
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void set_gl_modelview() const;
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/** Spin. used both to spin while button is pressed and if the ball is just
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spinning while program is idling. */
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void do_spin();
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bool is_spinning() const;
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/// Zeroes the rotation value - makes everything stop.
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void stop_spin();
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/// Call this function to start action when mouse button is pressed
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void grab_ball(TrackBallAction,const CGLA::Vec2i&);
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/// Call this function to perform action when user drags mouse
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void roll_ball(const CGLA::Vec2i&);
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/// Call this function to stop action when mouse is released.
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void release_ball()
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{
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current_action = NO_ACTION;
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}
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/// Returns true if the ball is `grabbed' and not released yet.
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bool is_grabbed() const
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{
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if(current_action == NO_ACTION)
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return false;
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return true;
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}
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void get_view_param(CGLA::Vec3f& eye,
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CGLA::Vec3f& _centre, CGLA::Vec3f& up) const;
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TrackBallAction get_current_action()
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{
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return current_action;
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}
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};
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}
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#endif
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