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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2025, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include "subcomplex/snappedtwosphere.h"
#include "subcomplex/snappedball.h"
#include "triangulation/dim3.h"
namespace regina {
std::unique_ptr<SnappedTwoSphere> SnappedTwoSphere::recognise(
Tetrahedron<3>* tet1, Tetrahedron<3>* tet2) {
std::unique_ptr<SnappedBall> ball[2];
if (! (ball[0] = SnappedBall::recognise(tet1)))
return nullptr;
if (! (ball[1] = SnappedBall::recognise(tet2)))
return nullptr;
if (tet1->edge(ball[0]->equatorEdge()) !=
tet2->edge(ball[1]->equatorEdge()))
return nullptr;
// This is it.
//
// Note: we cannot use make_unique here, since the class
// constructor is private.
return std::unique_ptr<SnappedTwoSphere>(new SnappedTwoSphere(
*ball[0], *ball[1]));
}
std::unique_ptr<SnappedTwoSphere> SnappedTwoSphere::recognise(
const SnappedBall& ball1, const SnappedBall& ball2) {
if (ball1.tetrahedron()->edge(ball1.equatorEdge()) !=
ball2.tetrahedron()->edge(ball2.equatorEdge()))
return nullptr;
// This is it.
//
// Note: we cannot use make_unique here, since the class
// constructor is private.
return std::unique_ptr<SnappedTwoSphere>(new SnappedTwoSphere(
ball1, ball2));
}
void SnappedTwoSphere::writeTextShort(std::ostream& out) const {
out << "Snapped 2-sphere, equator ";
for (int i = 0; i < 2; ++i) {
if (i == 1)
out << " = ";
int e = ball_[i].equatorEdge();
out << ball_[i].tetrahedron()->index() << " ("
<< Edge<3>::edgeVertex[e][0] << Edge<3>::edgeVertex[e][1] << ')';
}
}
} // namespace regina
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