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594 jab 1 
/* ----------------------------------------------------------------------- *
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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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#include "gel_glu.h"
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#include "GLViewController.h"
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#include "../CGLA/Mat3x3f.h"
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using namespace std;
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using namespace CGLA;
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namespace GLGraphics
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{
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  void GLViewController::reset_projection()
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  {
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    glMatrixMode(GL_PROJECTION);
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    glLoadIdentity();
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    gluPerspective(FOV_DEG, aspect, znear, zfar);
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    glMatrixMode(GL_MODELVIEW);
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  }
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  GLViewController::GLViewController(int _WINX, int _WINY, const CGLA::Vec3f& centre, float rad)
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    : FOV_DEG(53),
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      WINX(_WINX), WINY(_WINY),
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      aspect(WINX/float(WINY)),
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      button_down(false),
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      spin(false),
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      ball(centre, rad, WINX, WINY)
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  {
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    znear = 0.01f*rad;
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    zfar  = 3*rad;
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    reset_projection();
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  }
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  void GLViewController::grab_ball(TrackBallAction action, const CGLA::Vec2i& pos)
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  {
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    ball.grab_ball(action,pos);
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    if(action==ZOOM_ACTION)
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      set_near_and_far();
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    spin = false;
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    button_down = true;
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    last_action = action;
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  }
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  void GLViewController::roll_ball(const CGLA::Vec2i& pos)
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  {
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    static Vec2i old_pos = pos;
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    Vec2f dir = Vec2f(pos-old_pos);
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    float len = dir.length();
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    if (len < TINY)
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      return;
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    ball.roll_ball(pos);
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    if(last_action==ZOOM_ACTION)
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      set_near_and_far();
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    spin = len>=1.1f;
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    old_pos = pos;
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  }
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  void GLViewController::release_ball()
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  {
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    ball.release_ball();
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    if(last_action==ZOOM_ACTION)
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      set_near_and_far();
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  }
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  bool GLViewController::try_spin()
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  {
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    if(spin && !ball.is_grabbed())
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    {
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      ball.do_spin();
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      return true;
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    }
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    return false;
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  }
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  void GLViewController::set_gl_modelview()
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  {
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    ball.set_gl_modelview();
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  }
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  void GLViewController::reshape(int W, int H)
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  {
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    WINX = W;
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    WINY = H;
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    aspect = WINX/static_cast<float>(WINY);
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    glViewport(0,0,WINX,WINY);
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    reset_projection();
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    ball.set_screen_window(WINX, WINY);
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  }
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424 jrf 99 
  void GLViewController::set_near_and_far()
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  {
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    float rad = ball.get_eye_dist();
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    znear = 0.01f*rad;
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    zfar = 3*rad;
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    reset_projection();
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  }
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623 jerf 107 
  void GLViewController::set_view_param(const Vec3f& e, const Vec3f& c, const Vec3f& u)
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  {
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    // native viewing direction is the negative z-axis
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    // while right is the x-axis and up is the y-axis
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    Vec3f view = c - e;
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    float eye_dist = length(view);
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    view /= eye_dist;
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    Vec3f right = normalize(cross(view, u));
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    Vec3f up = cross(right, view);
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    Mat3x3f rot(right, up, -view);
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    rot = transpose(rot); // since matrix is row-major
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    // convert the change-of-basis matrix to a quaternion
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    Quatf qrot;
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    qrot.make_rot(rot);
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    set_rotation(qrot);
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    set_centre(c);
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    set_eye_dist(eye_dist);
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  }
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  bool GLViewController::load(std::ifstream& ifs)
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  {
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    if(ifs)
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    {
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      ifs.read(reinterpret_cast<char*>(this), sizeof(GLViewController));
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      reset_projection();
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      ball.set_screen_window(WINX, WINY);
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      return true;
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    }
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    return false;
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  }
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  bool GLViewController::save(std::ofstream& ofs) const
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  {
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    if(ofs)
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    {
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      ofs.write(reinterpret_cast<const char*>(this), sizeof(GLViewController));
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      return true;
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    }
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    return false;
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   }
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}