140 lines
3.7 KiB
C++
140 lines
3.7 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: https://github.com/CGAL/cgal/blob/v5.1/Polygon/include/CGAL/draw_polygon_2.h $
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// $Id: draw_polygon_2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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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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#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_qt.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_Qt5, and is only available if the flag CGAL_USE_BASIC_VIEWER is defined at compile time.
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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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#ifdef CGAL_USE_BASIC_VIEWER
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#include <CGAL/Polygon_2.h>
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#include <CGAL/Random.h>
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namespace CGAL
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{
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// Viewer class for Polygon_2
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template<class P2>
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class SimplePolygon2ViewerQt : public Basic_viewer_qt
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{
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typedef Basic_viewer_qt Base;
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typedef typename P2::Point_2 Point;
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public:
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/// Construct the viewer.
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/// @param ap2 the polygon to view
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/// @param title the title of the window
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SimplePolygon2ViewerQt(QWidget* parent, const P2& ap2,
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const char* title="Basic Polygon_2 Viewer") :
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// First draw: vertices; edges, faces; multi-color; no inverse normal
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Base(parent, title, true, true, true, false, false),
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p2(ap2)
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{
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compute_elements();
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}
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protected:
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void compute_elements()
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{
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clear();
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if (p2.is_empty()) return;
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Point prev=p2.vertex(p2.size()-1);
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CGAL::Color c(75,160,255);
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face_begin(c);
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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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add_point(*i); // Add vertex
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add_segment(prev, *i); // Add segment with previous point
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add_point_in_face(*i); // Add point in face
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prev=*i;
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}
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face_end();
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}
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virtual void keyPressEvent(QKeyEvent *e)
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{
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// Test key pressed:
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// const ::Qt::KeyboardModifiers modifiers = e->modifiers();
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// if ((e->key()==Qt::Key_PageUp) && (modifiers==Qt::NoButton)) { ... }
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// Call: * compute_elements() if the model changed, followed by
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// * redraw() if some viewing parameters changed that implies some
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// modifications of the buffers
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// (eg. type of normal, color/mono)
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// * update() just to update the drawing
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// Call the base method to process others/classicals key
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Base::keyPressEvent(e);
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}
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protected:
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const P2& p2;
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};
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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::Polygon_2<T, C>& ap2,
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const char* title="Polygon_2 Basic Viewer")
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{
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#if defined(CGAL_TEST_SUITE)
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bool cgal_test_suite=true;
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#else
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bool cgal_test_suite=qEnvironmentVariableIsSet("CGAL_TEST_SUITE");
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#endif
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if (!cgal_test_suite)
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{
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int argc=1;
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const char* argv[2]={"t2_viewer","\0"};
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QApplication app(argc,const_cast<char**>(argv));
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SimplePolygon2ViewerQt<CGAL::Polygon_2<T, C> >
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mainwindow(app.activeWindow(), ap2, title);
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mainwindow.show();
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app.exec();
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}
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}
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} // End namespace CGAL
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#endif // CGAL_USE_BASIC_VIEWER
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#endif // CGAL_DRAW_POLYGON_2_H
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