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/**
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* @file GLViewController.h
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* @brief Class for setting view transform.
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*/
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/* ----------------------------------------------------------------------- *
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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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#ifndef __GLGRAPHICS_GLVIEWCONTROLLER_H__
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#define __GLGRAPHICS_GLVIEWCONTROLLER_H__
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#include <fstream>
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#include "QuatTrackBall.h"
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namespace GLGraphics
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{
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/** The GLViewController is a more high level component than a trackball.
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The idea behind GLViewController is to handle setting up the projection
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and changing the viewport when the window is reshaped. Basically the raw
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mouse position and related info is sent to the view controller which takes
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care of the rest.
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*/
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class GLViewController
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{
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float FOV_DEG;
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int WINX, WINY;
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float znear, zfar;
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float aspect;
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bool button_down;
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TrackBallAction last_action;
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bool spin;
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QuatTrackBall ball;
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public:
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GLViewController();
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/** Constructor which accepts the window dimensions as well as the world center and the
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radius which should be construed as the distance to the observer */
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GLViewController(int _WINX, int _WINY,
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const CGLA::Vec3f& _centre, float _rad);
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/// Grab ball takes an action and a mouse position.
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void grab_ball(TrackBallAction action, const CGLA::Vec2i& pos);
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/// Roll virtual trackball (pass just mouse position).
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void roll_ball(const CGLA::Vec2i& pos);
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/// Release the virtual trackball
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void release_ball();
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/// Try to spind the trackball - called from idle.
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bool try_spin();
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/// Setup GL modelview matrix.
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void set_gl_modelview();
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/// Reset projection. Called initially, when window size has changed or when user zooms.
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void reset_projection();
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/// Reshape window.
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void reshape(int W, int H);
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/// Set near and far planes.
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void set_near_and_far();
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/// Set centre of ball.
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void set_centre(const CGLA::Vec3f& c)
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{
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ball.set_centre(c);
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}
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/// Set rotation of ball.
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void set_rotation(const CGLA::Quatf& qrot)
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{
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ball.set_rotation(qrot);
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}
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/// Set eye distance.
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void set_eye_dist(float rad)
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{
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ball.set_eye_dist(rad);
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set_near_and_far();
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}
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/// Returns eye distance
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float get_eye_dist() const
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{
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return ball.get_eye_dist();
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}
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/// Get viewing parameters: eye, centre, up
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void get_view_param(CGLA::Vec3f& e, CGLA::Vec3f& c, CGLA::Vec3f& u) const
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{
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ball.get_view_param(e,c,u);
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}
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/// Set viewing parameters: eye centre, up
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void set_view_param(const CGLA::Vec3f& e, const CGLA::Vec3f& c, const CGLA::Vec3f& u);
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/// Load trackball from stream
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bool load(std::ifstream&);
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/// Save trackball to stream.
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bool save(std::ofstream&) const;
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};
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}
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#endif
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