Subversion Repositories gelsvn

#ifdef WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include "GLViewController.h"

using namespace std;
using namespace CGLA;

namespace Graphics
{
    
        void GLViewController::reset_projection()
        {
                glMatrixMode(GL_PROJECTION);
                glLoadIdentity();
                gluPerspective(FOV_DEG, aspect, znear, zfar);
                glMatrixMode(GL_MODELVIEW);
        }

        GLViewController::GLViewController(int _WINX, int _WINY,
                                                                         const CGLA::Vec3f& _centre, float _rad):
                FOV_DEG(53),
                FOV_RAD((FOV_DEG*M_PI)/180.0f),
                WINX(_WINX), WINY(_WINY), 
                aspect(WINX/WINY),
                centre(_centre), rad(_rad),
                button_down(false),
                spin(false)
        {
                float view_dist = rad/sin(FOV_RAD/2.0f);
                ball = new TrackBall(centre, view_dist, WINX, WINY);
                znear = view_dist - rad;
                zfar  = view_dist + rad;

                reset_projection();
        }

        void GLViewController::grab_ball(TrackBallAction action, 
                                                                                                                                         const CGLA::Vec2i& pos)
        {
                ball->grab_ball(action,pos);
                if(action==ZOOM_ACTION)
                        set_near_and_far();

                spin = false;
                button_down = true;
                last_action = action;
                old_pos     = pos;
        }

        void GLViewController::roll_ball(const CGLA::Vec2i& pos)
        {
                ball->roll_ball(pos);
                if(last_action==ZOOM_ACTION)
                        set_near_and_far();
                Vec2f dir = Vec2f(pos-old_pos);
                spin = dir.length()>=1.1f;
                old_pos = pos;  
        }


        void GLViewController::release_ball()
        {
                ball->release_ball();
                if(last_action==ZOOM_ACTION)
                        set_near_and_far();
        }

        bool GLViewController::try_spin()
        {
                if(spin && !ball->is_grabbed()) 
                        {
                                ball->do_spin();
                                return true;
                        }
                return false;
        }
        
        void GLViewController::set_gl_modelview()
        {
                ball->set_gl_modelview();
        }


        void GLViewController::reshape(int W, int H)
        {
                WINX = W;
                WINY = H;
                aspect = WINX/static_cast<float>(WINY);
                glViewport(0,0,WINX,WINY);
                reset_projection();
                ball->set_screen_window(WINX, WINY);
        }       

        void GLViewController::set_near_and_far()
        {               
                Vec3f eye, centre, up;
                ball->get_view_param(eye, centre, up);
                float len = (eye-centre).length();
                znear = max(0.01f*rad, len-rad);
                zfar = len+rad; 
                reset_projection();
        }

        bool GLViewController::load(std::ifstream& ifs)
        {
                if(ifs)
                        {
                                TrackBall* ball_tmp = ball;
                                ifs.read(reinterpret_cast<char*>(this),
                                                                 sizeof(GLViewController));             
                                ball = ball_tmp;
                                ifs.read(reinterpret_cast<char*>(ball),sizeof(TrackBall));              
                                reset_projection();
                                ball->set_screen_window(WINX, WINY);
                                return true;
                        }
                return false;
        }
        bool GLViewController::save(std::ofstream& ofs) const
        {
                if(ofs)
                        {
                                ofs.write(reinterpret_cast<const char*>(this),
                                                                        sizeof(GLViewController));
                                ofs.write(reinterpret_cast<const char*>(ball),sizeof(TrackBall));
                                return true;
                        }
                return false;
        }

}