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// Copyright (c) 2018-2022 GeometryFactory (France)
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/BGL/include/CGAL/draw_face_graph.h $
// $Id: include/CGAL/draw_face_graph.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
// Laurent Rineau <laurent.rineau@cgal.org>
// Mostafa Ashraf <mostaphaashraf1996@gmail.com>
#ifndef CGAL_DRAW_FACE_GRAPH_H
#define CGAL_DRAW_FACE_GRAPH_H
#include <CGAL/Graphics_scene.h>
#include <CGAL/Graphics_scene_options.h>
#include <CGAL/Dynamic_property_map.h>
#include <CGAL/Random.h>
#include <CGAL/boost/graph/helpers.h>
namespace CGAL {
namespace draw_function_for_FG {
template <typename FG, typename GSOptions>
void compute_elements(const FG &fg,
CGAL::Graphics_scene &graphics_scene,
const GSOptions &gs_options)
{
using Point=typename boost::property_map_value<FG, CGAL::vertex_point_t>::type;
using Kernel = typename CGAL::Kernel_traits<Point>::Kernel;
using Vector = typename Kernel::Vector_3;
auto vnormals = get(CGAL::dynamic_vertex_property_t<Vector>(), fg);
auto point_pmap = get(CGAL::vertex_point, fg);
for (auto v : vertices(fg))
{
Vector n(NULL_VECTOR);
int i = 0;
for (auto h : halfedges_around_target(halfedge(v, fg), fg))
{
if (!is_border(h, fg))
{
Vector ni = CGAL::cross_product(
Vector(get(point_pmap, source(h, fg)),
get(point_pmap, target(h, fg))),
Vector(get(point_pmap, target(h, fg)),
get(point_pmap, target(next(h, fg), fg))));
if (ni!=NULL_VECTOR)
{
n += ni;
++i;
}
}
}
put(vnormals, v, n / i);
}
if (gs_options.are_faces_enabled())
{
for (auto fh : faces(fg))
{
if (fh != boost::graph_traits<FG>::null_face() && // face exists
gs_options.draw_face(fg, fh)) // face is drawn
{
if(gs_options.colored_face(fg, fh)) // face is colored
{ graphics_scene.face_begin(gs_options.face_color(fg, fh)); }
else
{ graphics_scene.face_begin(); }
auto hd = halfedge(fh, fg);
const auto first_hd = hd;
do
{
auto v = source(hd, fg);
graphics_scene.add_point_in_face(get(point_pmap, v), get(vnormals, v));
hd = next(hd, fg);
}
while (hd != first_hd);
graphics_scene.face_end();
}
}
}
if(gs_options.are_edges_enabled())
{
for (auto e : edges(fg))
{
if(gs_options.colored_edge(fg, e)) // edge is colored
{
graphics_scene.add_segment(get(point_pmap, source(halfedge(e, fg), fg)),
get(point_pmap, target(halfedge(e, fg), fg)),
gs_options.edge_color(fg, e));
}
else
{
graphics_scene.add_segment(get(point_pmap, source(halfedge(e, fg), fg)),
get(point_pmap, target(halfedge(e, fg), fg)));
}
}
}
if(gs_options.are_vertices_enabled())
{
for (auto v : vertices(fg))
{
if(gs_options.colored_vertex(fg, v)) // vertex is colored
{
graphics_scene.add_point(get(point_pmap, v),
gs_options.vertex_color(fg, v));
}
else
{
graphics_scene.add_point(get(point_pmap, v));
}
}
}
}
} // draw_function_for_FG
template <class FG, class GSOptions>
void add_to_graphics_scene_for_fg(const FG &fg,
CGAL::Graphics_scene &graphics_scene,
const GSOptions &gs_options)
{
draw_function_for_FG::compute_elements(fg, graphics_scene, gs_options);
}
template <class FG>
void add_to_graphics_scene_for_fg(const FG &fg,
CGAL::Graphics_scene &graphics_scene)
{
Graphics_scene_options<FG,
typename boost::graph_traits<FG>::vertex_descriptor,
typename boost::graph_traits<FG>::edge_descriptor,
typename boost::graph_traits<FG>::face_descriptor>
gs_options;
gs_options.colored_face = [](const FG&,
typename boost::graph_traits<FG>::face_descriptor) -> bool
{ return true; };
gs_options.face_color = [] (const FG&,
typename boost::graph_traits<FG>::face_descriptor fh) -> CGAL::IO::Color
{
if (fh==boost::graph_traits<FG>::null_face())
{ return CGAL::IO::Color(100, 125, 200); }
return get_random_color(CGAL::get_default_random());
};
add_to_graphics_scene_for_fg(fg, graphics_scene, gs_options);
}
} // End namespace CGAL
#endif // CGAL_DRAW_SURFACE_MESH_H
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