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#ifndef GFXARCBALL_INCLUDED // -*- C++ -*-
#define GFXARCBALL_INCLUDED
#if !defined(__GNUC__)
# pragma once
#endif
/************************************************************************
Arcball rotation control.
$Id: arcball.h 427 2004-09-27 04:45:31Z garland $
************************************************************************/
#include "baseball.h"
namespace gfx
{
class Arcball : public Baseball
{
private:
Vec2 ball_ctr;
double ball_radius;
Quat q_now, q_down, q_drag; // Quaternions describing rotation
Vec3 v_from, v_to; //
bool is_dragging;
protected:
Vec3 proj_to_sphere(const Vec2&);
void update();
public:
Arcball();
virtual void update_animation();
virtual bool mouse_down(int *where, int which);
virtual bool mouse_up(int *where, int which);
virtual bool mouse_drag(int *where, int *last, int which);
virtual void apply_transform();
virtual void get_transform(Vec3 & c, Vec3 &t, Quat & q);
virtual void set_transform(const Vec3 & c, const Vec3 & t, const Quat & q);
virtual void write(std::ostream&);
virtual void read(std::istream&);
};
} // namespace gfx
// GFXARCBALL_INCLUDED
#endif
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