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/*
* arrow_data.cc -- ePiX arrow class
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.2.0-2
* Last Change: September 26, 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <list>
#include <cmath>
#include "triples.h"
#include "functions.h"
#include "camera.h"
#include "edge_data.h"
#include "path_data.h"
#include "clipping.h"
#include "arrow_style.h"
#include "pen_data.h"
#include "paint_style.h"
#include "halfspace.h"
#include "pen_line.h"
#include "pen_arrow.h"
#include "screen_data.h"
#include "screen.h"
#include "active_screen.h"
#include "arrow_data.h"
namespace ePiX {
arrow_data::arrow_data(const std::vector<P>& pv, const P& base, const P& tip,
double scale)
: m_base(base), m_tip(tip), m_scale(scale),
m_head_seen(!the_clip_box().clips(m_tip))
{
for (unsigned int i=0; i<pv.size()-1; ++i)
m_shaft.push_back(edge3d(pv.at(i), pv.at(i+1), true));
the_clip_box().clip_path(m_shaft);
}
arrow_data& arrow_data::clip_to(const halfspace& knife)
{
knife.clip_path(m_shaft);
if (knife.clips(m_tip))
m_head_seen = false;
return *this;
}
void arrow_data::photo(screen& scr, const Camera& mycam,
const pen_data& line, const pen_data& under) const
{
arrow_data tmp_data(*this);
if (mycam.needs_clip())
tmp_data.clip_to(mycam.clip_plane());
std::list<edge2d> edges;
for (std::list<edge3d>::const_iterator p=tmp_data.m_shaft.begin();
p != tmp_data.m_shaft.end(); ++p)
{
edge2d tmp(mycam((*p).tail()), mycam((*p).head()), (*p).is_seen());
if (!tmp.is_null()) // endpoints not equal
edges.push_back(tmp);
}
// draw shaft
scr.m_screen->add_tile(pen_line(line.seen_through(mycam),
under.seen_through(mycam), edges));
// and arrowhead
if (m_head_seen)
{
const P dir(m_tip-m_base);
const P to_cam(mycam.viewpt()-m_base);
const double sin_th(norm(dir*to_cam)/(norm(dir)*norm(to_cam)));
scr.m_screen->add_tile(pen_arrow(mycam(m_base), mycam(m_tip),
line.seen_through(mycam),
under.seen_through(mycam),
m_scale, sin_th, m_head_seen));
}
}
void arrow_data::draw() const
{
photo(*active_screen(), cam(),
the_paint_style().line_pen(), the_paint_style().base_pen());
}
void arrow_data::draw(const pen_data& p1, const pen_data& p2) const
{
photo(*active_screen(), cam(), p1, p2);
}
} // end of namespace
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