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-/*
- * camera.cc -- ePiX::camera functions
- *
- * This file is part of ePiX, a C++ library for creating high-quality
- * figures in LaTeX
- *
- * Version 1.1.21
- * Last Change: September 22, 2007
- */
-
-/*
- * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
- * Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
- * Department of Mathematics and Computer Science
- * College of the Holy Cross
- * Worcester, MA, 01610-2395, USA
- */
-
-/*
- * ePiX is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * ePiX is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
- * License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with ePiX; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <cmath>
-
-#include "errors.h"
-#include "constants.h"
-
-#include "pairs.h"
-#include "triples.h"
-#include "frame.h"
-
-#include "functions.h"
-
-#include "halfspace.h"
-
-#include "lens.h"
-#include "camera.h"
-
-namespace ePiX {
-
- // Need to initialize frame argument for Apple gcc; otherwise cam()
- // gets null vectors in frame()...
- Camera::Camera()
- : the_viewpt(P(0,0,EPIX_INFTY)), the_target(P(0,0,0)),
- the_orient(frame(E_1, E_2, E_3)),
- the_distance(EPIX_INFTY), the_clip_range(MIN_CLIP),
- the_filter(Neutral()), the_lens(new Perspective()) { }
-
- // viewpt, target, orient
- Camera::Camera(const P& vpt)
- : the_viewpt(vpt), the_target(P(0,0,0)), the_clip_range(MIN_CLIP),
- the_filter(Neutral())
- {
- if (the_viewpt == P(0,0,0))
- {
- epix_warning("Cannot initialize Camera at Origin, using (0, 0, oo)");
- the_viewpt = P(0, 0, EPIX_INFTY);
- }
- P viewer(the_viewpt - the_target);
- the_distance = norm(viewer);
-
- viewer *= recip(norm(viewer));
-
- // viewer is "eye", if possible E_3 is "sky"
- P tmp_sea(E_3*viewer);
-
- if (norm(tmp_sea) < EPIX_EPSILON) // we're on the "z-axis through vpt"
- tmp_sea = E_1;
-
- // eye*sea = sky
- the_orient = frame(tmp_sea, viewer*tmp_sea, viewer);
- adjust();
-
- the_lens = new Perspective();
- }
-
-
- Camera::Camera(const Camera& cam)
- : the_viewpt(cam.the_viewpt), the_target(cam.the_target),
- the_orient(cam.the_orient), the_distance(cam.the_distance),
- the_clip_range(cam.the_clip_range), the_filter(cam.the_filter),
- the_lens(cam.the_lens->clone()) { }
-
- Camera& Camera::operator= (const Camera& cam)
- {
- Lens* tmp_lens(cam.the_lens->clone());
- the_lens = tmp_lens;
-
- the_viewpt = cam.the_viewpt;
- the_target = cam.the_target;
- the_orient =cam.the_orient;
- the_distance = cam.the_distance;
- the_clip_range = cam.the_distance;
-
- the_filter = cam.the_filter;
-
- return *this;
- }
-
- Camera::~Camera()
- {
- delete the_lens;
- }
-
- // rotate up/down
- Camera& Camera::tilt(double angle)
- {
- the_orient.rot1(-angle);
- the_target = the_viewpt + (-the_distance)*the_orient.eye();
- return *this;
- }
-
- // rotate left/right
- Camera& Camera::pan(double angle)
- {
- the_orient.rot2(-angle);
- the_target = the_viewpt + (-the_distance)*the_orient.eye();
- return *this;
- }
-
- // rotate about viewing axis
- Camera& Camera::roll(double angle)
- {
- the_orient.rot3(-angle); // target unchanged
- return *this;
- }
-
- // fix target, move viewpt radially along eye()
- Camera& Camera::range(double d)
- {
- if (d == 0)
- d = EPIX_INFTY;
-
- the_distance = d;
- the_viewpt = the_target + d*the_orient.eye();
-
- return *this;
- }
-
- // fix viewpt, move target radially along eye()
- Camera& Camera::focus(double d)
- {
- if (d == 0)
- d = EPIX_INFTY;
-
- the_distance = d;
- the_target = the_viewpt - d*the_orient.eye();
-
- return *this;
- }
-
- // clip everything behind this
- Camera& Camera::clip_range(double dist)
- {
- the_clip_range = (dist < MIN_CLIP ? MIN_CLIP : dist);
- return *this;
- }
-
- // fix target, set viewpt
- Camera& Camera::at(const P& vpt)
- {
- the_viewpt = vpt;
- adjust();
-
- return *this;
- }
-
- // fix viewpt, set target
- Camera& Camera::look_at(const P& tgt)
- {
- the_target = tgt;
- adjust();
-
- return *this;
- }
-
- Camera& Camera::at(double x1, double x2, double x3)
- {
- the_viewpt = P(x1, x2, x3);
- adjust();
-
- return *this;
- }
-
- // fix viewpt, set target
- Camera& Camera::look_at(double x1, double x2, double x3)
- {
- the_target = P(x1, x2, x3);
- adjust();
-
- return *this;
- }
-
- Camera& Camera::filter(const Color& filter)
- {
- the_filter=filter;
- return *this;
- }
-
- Camera& Camera::perspective()
- {
- delete the_lens;
- the_lens = new Perspective;
- return *this;
- }
-
- Camera& Camera::orthog()
- {
- delete the_lens;
- the_lens = new Orthog;
- return *this;
- }
-
- Camera& Camera::fisheye()
- {
- delete the_lens;
- the_lens = new Fisheye;
- return *this;
- }
-
- Camera& Camera::bubble()
- {
- delete the_lens;
- the_lens = new Bubble;
- return *this;
- }
-
- Color Camera::operator() (const Color& in_color) const
- {
- Color temp = the_filter;
- return temp.filter(in_color);
- }
-
- // lens interface
- pair Camera::operator() (const P& arg) const
- {
- return (*the_lens)(arg, the_orient, the_viewpt, the_distance);
- }
-
- bool Camera::is_linear() const
- {
- return (*the_lens).is_linear();
- }
-
- bool Camera::needs_clip() const
- {
- return (*the_lens).needs_clip();
- }
-
-
- halfspace Camera::clip_plane() const
- {
- const P N(-the_orient.eye());
- return halfspace(the_viewpt + the_clip_range*N, N);
- }
-
- P Camera::eye() const
- {
- return the_orient.eye();
- }
-
- P Camera::viewpt() const
- {
- return the_viewpt;
- }
-
- // private function
- void Camera::adjust()
- {
- P temp(the_target - the_viewpt);
- the_distance = norm(temp);
-
- if (the_distance < EPIX_EPSILON)
- {
- epix_warning("Cannot make viewpoint and target the same, no action");
- return;
- }
-
- // else
- temp *= -1.0/the_distance; // reverse direction
-
- double z_ht(temp|E_3);
-
- // too close to "z-axis" through target?
- if (sqrt((1-z_ht)*(1+z_ht)) < EPIX_EPSILON)
- {
- if (z_ht >= 0)
- the_orient = frame();
-
- else // z_ht < 0
- the_orient = frame(-E_1, E_2, -E_3);
- }
-
- else // far enough from axis
- the_orient = frame(P(-temp.x2(), temp.x1(), 0), E_3, temp);
- }
-
-
- Camera& cam()
- {
- static Camera* the_camera(new Camera());
- return *the_camera;
- }
-
- Camera& camera(cam());
-
-} // end of namespace