mirror of https://github.com/CGAL/cgal
148 lines
4.2 KiB
C++
148 lines
4.2 KiB
C++
// Copyright (c) 1997
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
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// Mostafa Ashraf <mostaphaashraf1996@gmail.com>
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#ifndef CGAL_DRAW_POLYGON_2_H
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#define CGAL_DRAW_POLYGON_2_H
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#include <CGAL/Qt/Basic_viewer.h>
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#include <CGAL/Graphics_scene.h>
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#include <CGAL/Graphics_scene_options.h>
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#include <CGAL/Polygon_2.h>
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#ifdef DOXYGEN_RUNNING
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namespace CGAL {
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/*!
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\ingroup PkgDrawPolygon2
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opens a new window and draws `ap`, an instance of the `CGAL::Polygon_2` class. A call to this function is blocking, that is the program continues as soon as the user closes the window. This function requires `CGAL_Qt6`, and is only available if the macro `CGAL_USE_BASIC_VIEWER` is defined.
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Linking with the cmake target `CGAL::CGAL_Basic_viewer` will link with `CGAL_Qt6` and add the definition `CGAL_USE_BASIC_VIEWER`.
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\tparam P an instance of the `CGAL::Polygon_2` class.
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\param ap the polygon to draw.
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*/
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template<class P>
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void draw(const P& ap);
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} /* namespace CGAL */
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#endif
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namespace CGAL {
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namespace draw_function_for_p2 {
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template <class P2, class GSOptions>
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void compute_elements(const P2& p2,
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CGAL::Graphics_scene &graphics_scene,
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const GSOptions& gso)
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{
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if (p2.is_empty())
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return;
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if (gso.are_faces_enabled())
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{
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if(gso.colored_face(p2, nullptr))
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{ graphics_scene.face_begin(gso.face_color(p2, nullptr)); }
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else
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{ graphics_scene.face_begin(); }
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}
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typename P2::Vertex_const_iterator prev=p2.vertices_end(); --prev;
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for (typename P2::Vertex_const_iterator i=p2.vertices_begin();
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i!=p2.vertices_end(); ++i)
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{
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if(gso.are_vertices_enabled() &&
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gso.draw_vertex(p2, i))
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{ // Add vertex
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if(gso.colored_vertex(p2, i))
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{ graphics_scene.add_point(*i, gso.vertex_color(p2, i)); }
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else
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{ graphics_scene.add_point(*i); }
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}
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if(gso.are_edges_enabled() &&
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gso.draw_edge(p2, prev))
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{ // Add edge with previous point
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if(gso.colored_edge(p2, prev))
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{ graphics_scene.add_segment(*prev, *i, gso.edge_color(p2, prev)); }
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else
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{ graphics_scene.add_segment(*prev, *i); }
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}
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if(gso.are_faces_enabled())
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{ graphics_scene.add_point_in_face(*i); } // Add point in face
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prev=i;
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}
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if (gso.are_faces_enabled())
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{ graphics_scene.face_end(); }
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}
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} // namespace draw_function_for_p2
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#define CGAL_P2_TYPE CGAL::Polygon_2<T, C>
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// Specializations of add_to_graphics_scene function
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template<class T, class C, class GSOptions>
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void add_to_graphics_scene(const CGAL_P2_TYPE& ap2,
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CGAL::Graphics_scene& graphics_scene,
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const GSOptions& gso)
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{ draw_function_for_p2::compute_elements(ap2, graphics_scene, gso); }
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template<class T, class C>
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void add_to_graphics_scene(const CGAL_P2_TYPE& ap2,
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CGAL::Graphics_scene &graphics_scene)
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{
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CGAL::Graphics_scene_options<CGAL_P2_TYPE,
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typename CGAL_P2_TYPE::Vertex_const_iterator,
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typename CGAL_P2_TYPE::Vertex_const_iterator,
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void*> gso;
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draw_function_for_p2::compute_elements(ap2, graphics_scene, gso);
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}
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#ifdef CGAL_USE_BASIC_VIEWER
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// Specialization of draw function.
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template <class T, class C>
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void draw(const CGAL_P2_TYPE &ap2,
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const char *title="Polygon_2 Basic Viewer")
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{
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CGAL::Graphics_scene buffer;
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add_to_graphics_scene(ap2, buffer);
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draw_graphics_scene(buffer, title);
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}
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template <class T, class C, class GSOptions>
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void draw(const CGAL_P2_TYPE &ap2,
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const GSOptions& gso,
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const char *title="Polygon_2 Basic Viewer")
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{
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CGAL::Graphics_scene buffer;
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add_to_graphics_scene(ap2, buffer, gso);
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draw_graphics_scene(buffer, title);
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}
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#endif // CGAL_USE_BASIC_VIEWER
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#undef CGAL_P2_TYPE
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} // End namespace CGAL
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#endif // CGAL_DRAW_POLYGON_2_H
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