GLGraphics::QuatTrackBall Class Reference

This class represents a virtual tracball. More...

#include <QuatTrackBall.h>

List of all members.

Public Member Functions
	QuatTrackBall (const CGLA::Vec3f &, float, unsigned, unsigned)
void	set_screen_window (unsigned _width, unsigned _height)
	Set window dimensions.
void	set_centre (const CGLA::Vec3f &_centre)
	set the centre point of rotation
void	set_screen_centre (const CGLA::Vec2i &_screen_centre)
const CGLA::Quatf &	get_rotation () const
void	set_rotation (const CGLA::Quatf &_qrot)
void	set_eye_dist (float _eye_dist)
float	get_eye_dist () const
void	set_gl_modelview () const
	Call GL to set up viewing.
void	do_spin ()
bool	is_spinning () const
void	stop_spin ()
	Zeroes the rotation value - makes everything stop.
void	grab_ball (TrackBallAction, const CGLA::Vec2i &)
	Call this function to start action when mouse button is pressed.
void	roll_ball (const CGLA::Vec2i &)
	Call this function to perform action when user drags mouse.
void	release_ball ()
	Call this function to stop action when mouse is released.
bool	is_grabbed () const
	Returns true if the ball is `grabbed' and not released yet.
void	get_view_param (CGLA::Vec3f &eye, CGLA::Vec3f &_centre, CGLA::Vec3f &up) const
TrackBallAction	get_current_action ()

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Detailed Description

This class represents a virtual tracball.

Use it in GLUT, FLTK or other OpenGL programs to allow the user to spin the model being rendered. It needs work to be used with non-GL apps since it calls GL API functions.

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Constructor & Destructor Documentation

GLGraphics::QuatTrackBall::QuatTrackBall	(	const CGLA::Vec3f &	_centre,
		float	_eye_dist,
		unsigned	_width,
		unsigned	_height
	)

First constructor argument is the point we look at. The second argument is the distance to eye point. The third is the scaling factor the last two arguments are the window dimensions.

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Member Function Documentation

void GLGraphics::QuatTrackBall::do_spin

(

)

Spin. used both to spin while button is pressed and if the ball is just spinning while program is idling.

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The documentation for this class was generated from the following files:

• /Users/jab/Documents/Teaching/02585/GEL2_and_demos/GEL/src/GLGraphics/QuatTrackBall.h
• /Users/jab/Documents/Teaching/02585/GEL2_and_demos/GEL/src/GLGraphics/QuatTrackBall.cpp