CGAL 6.1 - CGAL Basic Viewer

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Basic_viewer/draw_surface_mesh_small_faces.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/measure.h>
#include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
#include <iostream>
#include <string>
#include <cassert>
#include <CGAL/draw_surface_mesh.h>
typedef CGAL::Simple_cartesian<double> K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef Mesh::Vertex_index vertex_descriptor;
typedef Mesh::Face_index face_descriptor;
typedef K::FT FT;
template<class SM>
struct Graphics_scene_options_small_faces:
public CGAL::Graphics_scene_options<SM,
typename boost::graph_traits<SM>::vertex_descriptor,
typename boost::graph_traits<SM>::edge_descriptor,
typename boost::graph_traits<SM>::face_descriptor>
{
using Base=CGAL::Graphics_scene_options<SM,
typename boost::graph_traits<SM>::vertex_descriptor,
typename boost::graph_traits<SM>::edge_descriptor,
typename boost::graph_traits<SM>::face_descriptor>;
Graphics_scene_options_small_faces(const SM& sm): Base(), m_sm(sm)
{
std::optional<typename SM::template Property_map<face_descriptor, FT>> faces_size
= sm.template property_map<face_descriptor, FT>("f:size");
m_with_size = faces_size.has_value();
if(!m_with_size)
{ return; }
m_min_size=faces_size.value()[*(sm.faces().begin())];
m_max_size=m_min_size;
FT cur_size;
for (typename SM::Face_range::iterator f=sm.faces().begin(); f!=sm.faces().end(); ++f)
{
cur_size=faces_size.value()[*f];
if (cur_size<m_min_size) m_min_size=cur_size;
if (cur_size>m_max_size) m_max_size=cur_size;
}
this->face_color=[this](const SM& sm,
typename boost::graph_traits<SM>::face_descriptor fh) -> CGAL::IO::Color
{ return this->get_face_color(sm, fh); };
this->colored_face = [](const SM&,
typename boost::graph_traits<SM>::face_descriptor) -> bool
{ return true; };
}
CGAL::IO::Color get_face_color(const SM& sm,
typename boost::graph_traits<SM>::face_descriptor fh)
{
// Default color of faces
CGAL::IO::Color c(75,160,255);
if(!m_with_size) { return c; }
// Compare the size of the face with the % m_threshold
std::optional<typename SM::template Property_map<face_descriptor, FT>> faces_size
= sm.template property_map<face_descriptor, FT>("f:size");
assert(faces_size.has_value());
// If the face is small, color it in red.
if (get(faces_size.value(), fh)<m_min_size + ((m_max_size - m_min_size) / (100 - m_threshold)))
{ return CGAL::IO::Color(255,20,20); }
return c; // Default color
}
const SM& m_sm;
bool m_with_size;
FT m_min_size, m_max_size;
unsigned int m_threshold=85; // 85%
};
int main(int argc, char* argv[])
{
const std::string filename = (argc>1) ? argv[1] : CGAL::data_file_path("meshes/elephant.off");
Mesh sm;
if(!CGAL::IO::read_polygon_mesh(filename, sm))
{
std::cerr << "Invalid input file: " << filename << std::endl;
return EXIT_FAILURE;
}
CGAL::Polygon_mesh_processing::triangulate_faces(sm);
Mesh::Property_map<face_descriptor, FT> faces_size;
bool created;
std::tie(faces_size, created)=sm.add_property_map<face_descriptor, FT>("f:size",0.);
assert(created);
for(face_descriptor fd : sm.faces())
{ faces_size[fd]=CGAL::Polygon_mesh_processing::face_area(fd, sm); }
Graphics_scene_options_small_faces gsosm(sm);
CGAL::Graphics_scene gs;
add_to_graphics_scene(sm, gs, gsosm);
#ifdef CGAL_USE_BASIC_VIEWER
CGAL::Qt::QApplication_and_basic_viewer app(gs, "Small faces");
if(app)
{
app.basic_viewer().on_key_pressed=
[&sm, &gsosm, &gs] (QKeyEvent* e, CGAL::Qt::Basic_viewer* basic_viewer) -> bool
{
const ::Qt::KeyboardModifiers modifiers = e->modifiers();
if ((e->key() == ::Qt::Key_I) && (modifiers == ::Qt::NoButton))
{
gsosm.m_threshold+=5;
if(gsosm.m_threshold>100) { gsosm.m_threshold=100; }
basic_viewer->displayMessage
(QString("Small faces threshold=%1.").arg(gsosm.m_threshold));
gs.clear();
add_to_graphics_scene(sm, gs, gsosm);
basic_viewer->redraw();
}
else if ((e->key() == ::Qt::Key_D) && (modifiers == ::Qt::NoButton))
{
if(gsosm.m_threshold<5) { gsosm.m_threshold=0; }
else { gsosm.m_threshold-=5; }
basic_viewer->displayMessage
(QString("Small faces threshold=%1.").arg(gsosm.m_threshold));
gs.clear();
add_to_graphics_scene(sm, gs, gsosm);
basic_viewer->redraw();
}
else
{
// Return false will call the base method to process others/classicals key
return false;
}
return true;
};
// Here we add shortcut descriptions
app.basic_viewer().setKeyDescription(::Qt::Key_I, "Increase threshold for small faces");
app.basic_viewer().setKeyDescription(::Qt::Key_D, "Decrease threshold for small faces");
// Then we run the app
app.run();
}
#endif
sm.remove_property_map(faces_size);
return EXIT_SUCCESS;
}
CGAL::Graphics_scene
The class Graphics_scene stores points, segments, triangles, rays, and lines.
Definition: Graphics_scene.h:10
CGAL::Graphics_scene::clear
void clear()
clears the scene, i.e., removes all points, segments, triangles, and text.
CGAL::IO::Color
CGAL::Qt::Basic_viewer
The class Basic_viewer is a Qt widget based on QGLViewer that allows to visualize 3D elements: points...
Definition: Basic_viewer.h:13
CGAL::Qt::QApplication_and_basic_viewer
The class QApplication_and_basic_viewer regroups a Basic_viewer and Qt QApplication.
Definition: Basic_viewer.h:214
CGAL::Surface_mesh
add_to_graphics_scene
void add_to_graphics_scene(const SM &sm, CGAL::Graphics_scene &gs, const GSOptions &gso)
CGAL::Graphics_scene_options
The class Graphics_scene_options is used to tune the way that the cells of a given data structure of ...
Definition: Graphics_scene_options.h:28
CGAL::Simple_cartesian