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/*
* pen_arrow.cc -- ePiX::pen_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 <ahwang -at- holycross -dot- edu>
* 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 <sstream>
#include <list> // for arrow shaft cropping
#include "pairs.h"
#include "affine.h"
#include "screen_mask.h"
#include "length.h"
#include "edge_data.h"
#include "Color.h"
#include "arrow_style.h"
#include "label_style.h"
#include "marker_style.h" // for bbox marker
#include "format.h"
#include "picture_data.h"
#include "picture.h"
#include "tile.h"
#include "pen_arrow.h"
namespace ePiX {
pen_arrow::pen_arrow(const pair& tail, const pair& head,
const pen_data& line, const pen_data& base,
double scale, double sin_th, bool head_seen)
: m_shaft(tail, head, true), m_line(line), m_base(base),
m_scale(scale), m_shorten(sin_th), m_head_seen(head_seen),
m_style(the_arrowhead_style()) { }
pen_arrow* pen_arrow::clone() const
{
return new pen_arrow(*this);
}
pen_arrow& pen_arrow::map_by(const affine& f)
{
m_shaft = edge2d(f(m_shaft.tail()), f(m_shaft.head()), m_shaft.is_seen());
return *this;
}
pen_arrow& pen_arrow::crop_to(const screen_mask& M)
{
// update head visibility; never re-mark as visible
if (M.crops(m_shaft.head()))
m_head_seen = false;
// screen masks are convex, so we're cropped iff an end is cropped
if (M.crops(m_shaft.head()) || M.crops(m_shaft.tail()))
{
std::list<edge2d> shaft;
shaft.push_back(m_shaft);
M.crop_path(shaft);
// search for visible segment; will find no more than one
bool still_seen(false);
for (std::list<edge2d>::const_iterator ep = shaft.begin();
ep != shaft.end(); ++ep)
if ((*ep).is_seen())
{
still_seen = true;
m_shaft = *ep;
}
if (!still_seen)
{
m_head_seen = false;
m_shaft.seen(false);
}
}
return *this;
}
bool pen_arrow::is_empty() const
{
return !(m_head_seen && m_shaft.is_seen()) || m_line.color().is_unset();
}
/*
*
* 1: base, 2: foot, 3: tip, 4: ear_right, 5: ear_left
*
5
...
......... .....
.........1 2.....3
......... .....
...
4
* <-height->
*
* <--> inset (fraction of height)
*
*/
std::string pen_arrow::print_to(const format& fmt,
const std::string& len) const
{
if (is_empty())
return "";
// else
std::stringstream obuf;
if (m_shaft.tail() == m_shaft.head()) // draw a ddot
{
label_state my_state(the_label_style());
my_state.text_color(m_line.color());
obuf << fmt.print_mark(m_shaft.tail(), pair(0,0),
DDOT, the_mark_size(), my_state, len);
}
else
{
const pair head(m_shaft.head());
const double stretch(length("1pt").to(len).magnitude());
pair dir(head - m_shaft.tail());
double dist(norm(dir));
const pair unit_dir((stretch/dist)*dir);
const pair unit_perp(J(unit_dir));
const double wd(m_scale*m_style.width());
const double ht(m_style.ratio()*wd*m_shorten);
const pair base(head - ht*unit_dir);
const pair foot(head - (1-m_style.inset())*ht*unit_dir);
const pair ear_left(base + wd*unit_perp);
const pair ear_right(base - wd*unit_perp);
std::list<edge2d> bd;
bd.push_back(edge2d(foot, ear_right, true));
bd.push_back(edge2d(ear_right, head, true));
bd.push_back(edge2d(head, ear_left, true));
bd.push_back(edge2d(ear_left, foot, true));
obuf << fmt.print_fill(bd, pair(0,0), m_line.color(), m_line, len);
}
return obuf.str();
}
void pen_arrow::add_to_palette() const
{
if (!is_empty())
the_picture().add_to_palette(m_line.color())
.add_to_palette(m_base.color());
}
} // end of namespace
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