GLGraphics::SimpleTrackBall Class Reference

Simple trackball class. More...

#include <SimpleTrackBall.h>

List of all members.

Public Member Functions
	SimpleTrackBall (const CGLA::Vec3f &_center, float _r)
void	gl_view () const
void	get_view (CGLA::Vec3f &c, CGLA::Vec3f &e, CGLA::Vec3f &u)
void	up_axis (char up)
void	farther ()
void	closer ()
void	roll (int x, int y)
void	set_center (const CGLA::Vec3f &_center)

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Detailed Description

Simple trackball class.

Use it to let the mouse movement control the viewing transformation.

Typical usage: Construct the trackball as a global variable. Call the roll function from the GLUT mouse motion callback. Setup an idle callback which only calls glutPostRedisplay and call gl_view from the display function to set up the view transform.

Deficiencies: This trackball has many shortcomings. For instance you cannot pan but only zoom and rotate. Go fix those problems!

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Constructor & Destructor Documentation

GLGraphics::SimpleTrackBall::SimpleTrackBall	(	const CGLA::Vec3f &	_center,
		float	_r
	)		[inline]

Constructor. Call with the distance to the center.

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Member Function Documentation

void GLGraphics::SimpleTrackBall::closer

(

)

[inline]

Move closer. Typically called from the keyboard callback

void GLGraphics::SimpleTrackBall::farther

(

)

[inline]

Move away. Typically called from the keyboard callback

void GLGraphics::SimpleTrackBall::gl_view

(

)

const

Callthis to set up OpenGL viewing matrix. It will also clear the view matrix.

Call this to set up OpenGL viewing matrix. It will also clear the view matrix.

void GLGraphics::SimpleTrackBall::roll	(	int	x,
		int	y
	)

Roll ball. Call with the x,y coordinates. This function is typically called from GLUT's mouse motion callback.

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