geomview_stream.h

很多二维 三维几何计算算法 C++ 类库

// Copyright (c) 1997,1998,1999,2000,2001  Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.3-branch/Geomview/include/CGAL/IO/Geomview_stream.h $
// $Id: Geomview_stream.h 28567 2006-02-16 14:30:13Z lsaboret $
// 
//
// Author(s)     : Andreas Fabri, Sylvain Pion

#ifndef CGAL_GEOMVIEW_STREAM_H
#define CGAL_GEOMVIEW_STREAM_H

#include <CGAL/basic.h>
#include <CGAL/Bbox_2.h>
#include <CGAL/Bbox_3.h>
#include <CGAL/IO/Color.h>
#include <CGAL/IO/Ostream_iterator.h>

#include <map>
#include <vector>
#include <utility>
#include <string>
#include <iterator>
#include <algorithm>

CGAL_BEGIN_NAMESPACE

class Geomview_stream {
public:
    Geomview_stream(const Bbox_3 &bbox = Bbox_3(0,0,0, 1,1,1),
		    const char *machine = NULL,
		    const char *login = NULL);

    ~Geomview_stream();

    Geomview_stream &operator<<(const Color &c);
    Geomview_stream &operator<<(const std::string & s);
    Geomview_stream &operator<<(int i);
    Geomview_stream &operator<<(unsigned int i);
    Geomview_stream &operator<<(long i);
    Geomview_stream &operator<<(unsigned long i);
    Geomview_stream &operator<<(double d);

    template < class InputIterator >
    void
    draw_triangles(InputIterator begin, InputIterator end);

    Geomview_stream &operator>>(char *expr);

    void clear();
    void look_recenter();

    void set_bg_color(const Color &c);

    Color get_vertex_color() const;
    Color get_edge_color() const;
    Color get_face_color() const;

    Color set_vertex_color(const Color&);
    Color set_edge_color(const Color&);
    Color set_face_color(const Color&);

    double vcr() const;
    double vcg() const;
    double vcb() const;

    double ecr() const;
    double ecg() const;
    double ecb() const;

    double fcr() const;
    double fcg() const;
    double fcb() const;

    double get_vertex_radius() const
    {
	return radius;
    }
    double set_vertex_radius(double r)
    {
	std::swap(r, radius);
	return r;
    }

    int get_line_width() const
    {
	return line_width;
    }
    int set_line_width(int w)
    {
	std::swap(w, line_width);
        return w;
    }

    bool set_wired(bool b)
    {
	std::swap(b, wired_flag);
	return b;
    }
    bool get_wired() const
    {
	return wired_flag;
    }

    bool set_echo(bool b)
    {
	std::swap(b, echo_flag);
	return b;
    }
    bool get_echo() const
    {
	return echo_flag;
    }

    bool set_raw(bool b)
    {
	std::swap(b, raw_flag);
	return b;
    }
    bool get_raw() const
    {
	return raw_flag;
    }

    bool set_trace(bool b)
    {
	std::swap(b, trace_flag);
	return b;
    }
    bool get_trace() const
    {
	return trace_flag;
    }

    void trace(const std::string s) const
    {
        if (get_trace())
            std::cerr << s;
    }
    void trace(double d) const
    {
        if (get_trace())
            std::cerr << d << ' ';
    }
    void trace(int i) const
    {
        if (get_trace())
            std::cerr << i << ' ';
    }
    void trace(unsigned int i) const
    {
        if (get_trace())
            std::cerr << i << ' ';
    }

    bool set_binary_mode(bool b = true)
    {
	std::swap(b, binary_flag);
	return b;
    }
    bool set_ascii_mode(bool b = true)
    {
	return !set_binary_mode(!b);
    }
    bool get_binary_mode() const
    {
	return binary_flag;
    }
    bool get_ascii_mode() const
    {
	return !binary_flag;
    }

    std::string get_new_id(const std::string & s);

    const Bbox_3 & get_bbox()
    {
	return bb;
    }

    void pickplane()
    {
        pickplane(get_bbox());
    }

    static char* nth(char* s, int count);
    static void parse_point(const char* pickpoint,
		     double &x, double &y, double &z, double &w);
private:
    void setup_geomview(const char *machine, const char *login);
    void frame(const Bbox_3 &bbox);
    void pickplane(const Bbox_3 &bbox);

    Bbox_3 bb;
    Color vertex_color, edge_color, face_color;
    bool wired_flag;  // decides if we draw surfaces or edges.
    bool echo_flag;   // decides if we echo the point we get back to Geomview.
    bool raw_flag;    // decides if we output footers and headers.
    bool trace_flag;  // makes operator<<() write a trace on cerr.
    bool binary_flag; // makes operator<<() write binary format
    int line_width;   // width of edges
    double radius;    // radius of vertices
    int in, out;      // file descriptors for input and output pipes
    int pid;          // the geomview process identification
    std::map<std::string, int> id; // used to get a unique ID per type.
};

// Factorize code for Point_2 and Point_3.
template < class FT >
void
output_point(Geomview_stream &gv, const FT &x, const FT &y, const FT &z)
{
    bool ascii_bak = true; // the initialization value shuts up the compiler.
    if (!gv.get_raw()) {
    	ascii_bak = gv.set_ascii_mode();
    	gv << "(geometry " << gv.get_new_id("P")
       	   << " {appearance {linewidth 5 material {edgecolor "
           << gv.vcr() << gv.vcg() << gv.vcb() << "}}{SKEL 1 1 ";
    }

    gv << CGAL::to_double(x) << CGAL::to_double(y) << CGAL::to_double(z);

    if (!gv.get_raw()) {
        gv << "1 0\n}})";
    	gv.set_ascii_mode(ascii_bak);
    }
}

#if defined CGAL_POINT_2_H && \
   !defined CGAL_GV_OUT_POINT_2_H
#define CGAL_GV_OUT_POINT_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Point_2<R> &p)
{
    typename R::FT zero(0);
    output_point(gv, p.x(), p.y(), zero);
    return gv;
}
#endif

#if defined CGAL_POINT_3_H && \
   !defined CGAL_GV_OUT_POINT_3_H
#define CGAL_GV_OUT_POINT_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Point_3<R> &p)
{
    output_point(gv, p.x(), p.y(), p.z());
    return gv;
}
#endif

// The following code is the same for Segment_2 and Segment_3.
template < class Segment >
void
output_segment(Geomview_stream &gv, const Segment &segment)
{
    bool ascii_bak = gv.set_ascii_mode();
    gv << "(geometry " << gv.get_new_id("Seg")
       << " {appearance {linewidth "
       << gv.get_line_width() << "}{VECT "
       << 1 <<  2 << 1    // 1 polyline, two vertices, 1 color
       << 2               // the first polyline contains 2 vertices
       << 1;              // and it has 1 color

    // here are start and end points
    bool raw_bak = gv.set_raw(true);
    gv << segment.source() << segment.target();
    gv.set_raw(raw_bak);

    // and the color of the segment and its opaqueness
    gv << gv.ecr() << gv.ecg() << gv.ecb() << 1.0 << "}})";
    gv.set_ascii_mode(ascii_bak);
}

#if defined CGAL_SEGMENT_2_H && \
   !defined CGAL_GV_OUT_SEGMENT_2_H
#define CGAL_GV_OUT_SEGMENT_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Segment_2<R> &segment)
{