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    QuatTrackBall::QuatTrackBall(const Vec3f& _centre,
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    QuatTrackBall::QuatTrackBall(const Vec3f& _centre,
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			 float _eye_dist,
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			 float _eye_dist,
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			 unsigned _width,
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			 unsigned _width,
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			 unsigned _height):
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			 unsigned _height):
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	centre(_centre), width(_width), height(_height),
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	centre(_centre), width(_width), height(_height),
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	scale(0.5*_eye_dist), eye_dist(_eye_dist)
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	eye_dist(_eye_dist)
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	{
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	{
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	// This size should really be based on the distance from the center of
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	// This size should really be based on the distance from the center of
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	// rotation to the point on the object underneath the mouse.  That
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	// rotation to the point on the object underneath the mouse.  That
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	// point would then track the mouse as closely as possible.  This is a
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	// point would then track the mouse as closely as possible.  This is a
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	// simple example, though, so that is left as an exercise.
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	// simple example, though, so that is left as an exercise.
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	do_spin();
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	do_spin();
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    }
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    }
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    void QuatTrackBall::pan(const Vec2f& new_v)
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    void QuatTrackBall::pan(const Vec2f& new_v)
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    {
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    {
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	trans += (new_v - last_pos) * Vec2f(scale[0], scale[1]);
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	trans += (new_v - last_pos) * Vec2f(eye_dist);
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    }
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    }
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    void QuatTrackBall::zoom(const Vec2f& new_v)
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    void QuatTrackBall::zoom(const Vec2f& new_v)
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    {
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    {
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	eye_dist += (new_v[1] - last_pos[1]) * scale[2];
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	eye_dist += (new_v[1] - last_pos[1]) * eye_dist;
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	eye_dist = max(eye_dist, 0.01f);
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	eye_dist = max(eye_dist, 0.01f);
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    }
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    }
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    void QuatTrackBall::calcRotation(const Vec2f& new_pos)
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    void QuatTrackBall::calcRotation(const Vec2f& new_pos)
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    {
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    {