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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2008, 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. *
* *
* 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, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
* MA 02110-1301, USA. *
* *
**************************************************************************/
/* end stub */
#include "angle/nanglestructure.h"
#include "triangulation/ntriangulation.h"
#include "file/nfile.h"
#include "utilities/xmlutils.h"
// Property IDs:
#define PROPID_FLAGS 1
namespace regina {
const unsigned long NAngleStructure::flagStrict = 1;
const unsigned long NAngleStructure::flagTaut = 2;
const unsigned long NAngleStructure::flagCalculatedType = 4;
NAngleStructure* NAngleStructure::clone() const {
NAngleStructure* ans = new NAngleStructure(triangulation,
dynamic_cast<NAngleStructureVector*>(vector->clone()));
ans->flags = flags;
return ans;
}
NRational NAngleStructure::getAngle(unsigned long tetIndex, int edgePair)
const {
const NLargeInteger& num = (*vector)[3 * tetIndex + edgePair];
const NLargeInteger& den =
(*vector)[3 * triangulation->getNumberOfTetrahedra()];
NLargeInteger gcd = den.gcd(num);
if (gcd < 0)
gcd.negate();
return NRational(num.divExact(gcd), den.divExact(gcd));
}
void NAngleStructure::writeTextShort(std::ostream& out) const {
unsigned long nTets = triangulation->getNumberOfTetrahedra();
unsigned j;
for (unsigned long tet = 0; tet < nTets; tet++) {
if (tet > 0)
out << " ; ";
for (j=0; j<3; j++) {
if (j > 0)
out << ' ';
out << getAngle(tet, j);
}
}
}
void NAngleStructure::writeToFile(NFile& out) const {
// Write the vector length.
unsigned vecLen = vector->size();
out.writeUInt(vecLen);
// Write all non-zero entries.
NLargeInteger entry;
for (unsigned i=0; i<vecLen; i++) {
entry = (*vector)[i];
if (entry != 0) {
out.writeInt(i);
out.writeLarge(entry);
}
}
out.writeInt(-1);
// Write properties.
std::streampos bookmark(0);
bookmark = out.writePropertyHeader(PROPID_FLAGS);
out.writeULong(flags);
out.writePropertyFooter(bookmark);
out.writeAllPropertiesFooter();
}
NAngleStructure* NAngleStructure::readFromFile(NFile& in,
NTriangulation* triangulation) {
// Read the vector length and make a new vector.
unsigned vecLen = in.readUInt();
NAngleStructureVector* vector = new NAngleStructureVector(vecLen);
// Read all non-zero vector entries.
int vecPos = in.readInt();
while (vecPos != -1) {
vector->setElement(vecPos, in.readLarge());
vecPos = in.readInt();
}
NAngleStructure* ans = new NAngleStructure(triangulation, vector);
// Read in properties.
in.readProperties(ans);
return ans;
}
void NAngleStructure::writeXMLData(std::ostream& out) const {
// Write the vector length.
unsigned vecLen = vector->size();
out << " <struct len=\"" << vecLen << "\"> ";
// Write the non-zero elements.
NLargeInteger entry;
for (unsigned i = 0; i < vecLen; i++) {
entry = (*vector)[i];
if (entry != 0)
out << i << ' ' << entry << ' ';
}
// Write properties.
out << regina::xml::xmlValueTag("flags", flags);
// Write the closing tag.
out << "</struct>\n";
}
void NAngleStructure::readIndividualProperty(NFile& infile, unsigned propType) {
if (propType == PROPID_FLAGS) {
flags = infile.readULong();
}
}
void NAngleStructure::calculateType() const {
unsigned long size = vector->size();
if (size == 1) {
// We have no tetrahedra at all; this angle structure is both
// strict and taut.
flags |= flagStrict;
flags |= flagTaut;
flags |= flagCalculatedType;
return;
}
bool taut = true;
bool strict = true;
// Run through the tetrahedra one by one.
const NLargeInteger& scale = (*vector)[size - 1];
unsigned long pair;
for (unsigned long base = 0; base < size - 1; base += 3) {
for (pair = 0; pair < 3; pair++) {
if ((*vector)[base + pair] == scale) {
// We have a pi; thus all three angles in this
// tetrahedron are pi or zero.
strict = false;
break;
} else if ((*vector)[base + pair] == NLargeInteger::zero)
strict = false;
else
taut = false;
}
if ((! strict) && (! taut))
break;
}
// Update the flags as appropriate.
if (strict)
flags |= flagStrict;
else
flags &= (~flagStrict);
if (taut)
flags |= flagTaut;
else
flags &= (~flagTaut);
flags |= flagCalculatedType;
}
} // namespace regina
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