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shape.cxx
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shape.cxx
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// yass: Yet Another Soma Solver
// Copyright (C) 2021 Mark R. Rubin aka "thanks4opensource"
//
// This file is part of yass.
//
// The yass 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 3 of
// the License, or (at your option) any later version.
//
// The yass 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
// (LICENSE.txt) along with the yass program. If not, see
// <https://www.gnu.org/licenses/gpl.html>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <limits>
#include "rotators.hxx"
#include "signature.hxx"
#include "shape.hxx"
namespace soma {
// Public ======================================================================
Shape::Shape(
unsigned number_of_cubicles)
:
#ifdef SOMA_STD_SET_UNORDERED
// pre-allocate hash table for efficiency
_solutions_sets{SignatureSet(1<<14),
SignatureSet(1<<14),
SignatureSet(1<<14),
SignatureSet(1<<14),
SignatureSet(1<<14),
SignatureSet(1<<14),
SignatureSet(1<<14)},
#endif
_num_cubicles(number_of_cubicles)
#ifdef SOMA_STATISTICS
,
_statuses_uniques {0},
_statuses_duplicates{0}
#endif
{}
// See shape.hxx
void Shape::reset()
{
_symmetries .clear();
_rotators_mirrorers.clear();
_solutions .clear();
_solution_ps .clear();
_solution_ns .clear();
for (SignatureSet &solutions : _solutions_sets)
solutions.clear();
for (Shape *child : _children)
delete child;
_children.clear();
for (Cubicle &cubicle : _cubicles) {
cubicle.occupant = 0 ;
cubicle.parent = &cubicle ;
cubicle.status = Cubicle::Status::UNSET;
}
} // reset()
// See shape.hxx
bool Shape::read(
std::istream &input ,
std::ostream *errors)
{
unsigned x ,
y = 0 ,
z = 0 ,
max_x = 0 ,
max_y = 0 ,
cubicle_ndx = 0 ;
bool z_pending = false, // to handle multiple blank lines ...
started = false , // ... between Z layers
blank ; // to separate Z layers
std::string line ; // input text
while (std::getline(input, line)) {
// truncate line if/at comment character
std::string::size_type special;
if ((special = line.find("#")) != std::string::npos)
line = line.substr(0, special);
// Comment and/or pure whitespace lines also count as blank
if (line.empty())
blank = true;
else if ((special = line.find_first_not_of("\t ")) == std::string::npos)
blank = true;
else
blank = false;
// New Z layer, handling of multiple blank lines
if (blank) {
if (!started) continue;
y = 0 ;
z_pending = true;
continue ;
}
started = true;
// Beginning of new Z layer
if (z_pending) {
z += 1 ;
z_pending = false;
}
// Z layer consisting of multiple Y slices
x = 0;
for (char const &letter : line) {
if (letter == '\t') {
*errors << "Illegal tab character in file"
<< std::endl;
return false;
}
// shape cubicle or empty space
if (letter != '.' && letter != ' ') {
if (cubicle_ndx < NUMBER_OF_CUBICLES) {
_cubicles[cubicle_ndx](x, y, z);
_cubicles[cubicle_ndx].parent = &_cubicles[cubicle_ndx];
_cubicles[cubicle_ndx].in_child = false ;
set_cubicle_piece(_cubicles[cubicle_ndx], letter);
}
++cubicle_ndx;
}
if (x > max_x) max_x = x;
++x;
}
if (y > max_y) max_y = y;
++y;
}
if (cubicle_ndx != NUMBER_OF_CUBICLES) {
if (errors)
*errors << "Bad number of cubicles: "
<< cubicle_ndx
<< " instead of "
<< NUMBER_OF_CUBICLES
<< std::endl;
return false;
}
// save values
_max_pos(max_x, max_y, z);
_num_cubicles = NUMBER_OF_CUBICLES;
// reverse Y and Z coords (were read in high-to-low so indexed 0-to-N)
// but want +Z and +Y up
for (Cubicle &cubicle : _cubicles) {
cubicle.y() = _max_pos.y() - cubicle.y();
cubicle.z() = _max_pos.z() - cubicle.z();
}
return prepare_solve(errors);
} // read(std::istream&, std::ostream&)
// See shape.hxx
bool Shape::specify(
const std::array<int, NUMBER_OF_CUBICLES * 3> coords,
const std::string pieces,
std::ostream *errors)
{
unsigned cubicle_ndx = 0;
for (Cubicle &cubicle : _cubicles) {
cubicle(coords[cubicle_ndx * 3 ],
coords[cubicle_ndx * 3 + 1],
coords[cubicle_ndx * 3 + 2]);
cubicle.parent = &cubicle;
cubicle.in_child = false ;
if (cubicle_ndx < pieces.size())
set_cubicle_piece(cubicle, pieces[cubicle_ndx]);
else
cubicle.occupant = 0;
++cubicle_ndx;
}
return prepare_solve(errors);
} // specify(const std::array, const std::string, std::ostream*)
// See shape.hxx
unsigned Shape::num_piece_cubicles(
const Piece *piece)
{
unsigned count = 0;
for (const Cubicle &cubicle : _cubicles)
if (cubicle.occupant == piece->code())
++count;
return count;
} // num_piece_cubicles(const Piece*)
// See shape.hxx
void Shape::write(
std::ostream &output)
const
{
// space instead of '.' for all-empty Y columns (for separated shapes)
//
IntSet full_xs;
for (auto cubicle : _cubicles)
full_xs.insert(cubicle.x());
auto cubicle = _cubicles.cbegin();
// z and y high-to-low, x low-to-high
for (int z_pos = _max_pos.z(); z_pos >= -_max_pos.z(); z_pos -= 2) {
for (int y_pos = _max_pos.y(); y_pos >= -_max_pos.y(); y_pos -= 2) {
for (int x_pos = -_max_pos.x(); x_pos <= _max_pos.x(); x_pos += 2) {
if (*cubicle == Position(x_pos, y_pos, z_pos)) {
if (cubicle->occupant)
output << Piece::code2name(cubicle->occupant);
else
output << '#';
++cubicle;
}
else if (full_xs.find(x_pos) != full_xs.end())
output << '.';
else
output << ' ';
}
output << std::endl;
}
if (z_pos != -_max_pos.z())
output << std::endl;
}
} // write(ostream&) const
// See shape.hxx
std::array<char, Shape::NUMBER_OF_CUBICLES> Shape::solution(
std::array<int, Shape::NUMBER_OF_CUBICLES * 3> &coords)
const
{
std::array<char, Shape::NUMBER_OF_CUBICLES> pieces;
for (unsigned ndx = 0; ndx < NUMBER_OF_CUBICLES; ++ndx) {
pieces[ndx ] = Piece::code2name(_cubicles[ndx].occupant);
coords[ndx * 3 ] = _cubicles[ndx].x();
coords[ndx * 3 + 1] = _cubicles[ndx].y();
coords[ndx * 3 + 2] = _cubicles[ndx].z();
}
return pieces;
} // solution(...)
// See shape.hxx
bool Shape::generate_rotator_reflectors(
std::ostream *errors)
{
if (_children.size() == 1)
return generate_rotator_reflectors(this, errors);
else
for (Shape *child : _children)
if (!generate_rotator_reflectors(child, errors))
return false;
return true;
} // generate_rotator_reflectors(std::ostream*)
// See shape.hxx
bool Shape::is_duplicate_solution(
const unsigned piece_number)
{
Signature signature;
if (_children.size() == 1)
generate_signature(signature);
else {
unsigned offset = 0;
for (Shape *child : _children) {
child->generate_signature_child(signature, offset);
offset += child->_num_cubicles;
}
}
// Check if in already seen solutions (or their rotations/reflections)
return _solutions_sets[piece_number].find(signature)
!= _solutions_sets[piece_number].end ( );
} // is_duplicate_solution(const unsigned)
// See shape.hxx
void Shape::add_solution(
const unsigned piece_number) // can be called after any piece is placed
{
if (_children.size() == 1) { // No need to combine/permute child solutions
add_solution_no_children(piece_number);
return;
}
// Generate all combinations of rotated/reflected child shapes
// E.g. if child/num_rot_refects are: a/2 b/3 c/1
// generate: a0/b0/c0 a0/b1/c0 a0/b2/c0
// a1/b0/c0 a1/b1/c0 a1/b2/c0
// But also make sure that no combination has multiple "p" or "n"
// shapes (which were generated when reflecting/mirror the
// child shapes>
//
for (Shape *child : _children) {
child->_solutions .clear();
child->_solution_ps.clear();
child->_solution_ns.clear();
add_solution(child) ;
}
// Indices of each child's rotated/mirrored solutions
std::vector<unsigned> combinations(_children.size(), 0);
// Go through all solutions for each child
while ( combinations[_children.size() - 1]
< _children[_children.size() - 1]->_solutions.size()) {
// must be before goto
Signature solution ; // concatenated child signatures
unsigned solution_ndx = 0;
// Only check for multiple "p" and "n" pieces if all pieces placed
if (piece_number == Piece::NUMBER_OF_PIECES - 1) {
unsigned num_ps = 0,
num_ns = 0;
for (unsigned ndx = 0 ; ndx < _children.size() ; ++ndx) {
num_ps += _children[ndx]->_solution_ps[combinations[ndx]];
num_ns += _children[ndx]->_solution_ns[combinations[ndx]];
}
// Must have exactly one each of "p" and "n" pieces
if (num_ps != 1 || num_ns != 1)
goto next_combination;
}
for (unsigned child_ndx = 0 ;
child_ndx < _children.size() ;
++child_ndx ) {
for (unsigned piece_ndx = 0 ;
piece_ndx < _children[child_ndx]->_num_cubicles ;
++piece_ndx ){
solution[solution_ndx++]
= _children[child_ndx]
->_solutions[combinations[child_ndx]][piece_ndx];
}
}
_solutions_sets[piece_number].insert(solution);
next_combination:
// increment to next permutation
for (unsigned permute_ndx = 0 ;
permute_ndx < _children.size() ;
++permute_ndx ) {
if ( ++combinations[permute_ndx]
< _children[permute_ndx]->_solutions.size())
break;
// rollover except last ("most significant digit") one
if (permute_ndx < _children.size() - 1)
combinations[permute_ndx] = 0;
}
}
} // add_solution(const unsigned)
// See shape.hxx
bool Shape::place_piece(
const unsigned cubicle_ndx ,
Piece* const piece ,
const unsigned piece_number ,
const unsigned number_of_cubes,
const Position cubes[] ,
const bool just_test )
{
Cubicle *center = &_cubicles[cubicle_ndx];
Cubicle *peripherals[Piece::MAX_NUMBER_OF_CUBES];
for (unsigned ndx = 0; ndx < number_of_cubes; ++ndx) {
Cubicle *peripheral = find_cubicle(center, cubes[ndx]);
if (!peripheral || peripheral->occupant)
return false;
peripherals[ndx] = peripheral;
}
if (just_test) return true;
center->occupant = piece->code();
// number_of_cubes doesn't include central one
_piece_cubicles[piece_number][number_of_cubes] = center;
for (unsigned ndx = 0; ndx < number_of_cubes; ++ndx) {
peripherals[ndx]->occupant = piece->code();
_piece_cubicles[piece_number][ndx] = peripherals[ndx];
}
return true;
} // place_piece(const unsigned ,
// Piece* const ,
// const unsigned ,
// const unsigned ,
// const Position[],
// const bool )
// See shape.hxx
bool Shape::has_orphan()
const
{
uint32_t handled = 0;
for (unsigned cubicle_ndx = 0 ;
cubicle_ndx < NUMBER_OF_CUBICLES ;
++cubicle_ndx ) {
const Cubicle *cubicle = &_cubicles[cubicle_ndx];
if (cubicle->occupant || (handled & (1 << cubicle_ndx)))
continue;
unsigned num_empties = 0;
const Cubicle *twin ;
for (const Cubicle* adjacent : cubicle->ortho_adjacents)
if (adjacent && !adjacent->occupant) {
++num_empties;
twin = adjacent;
}
if (num_empties == 0)
return true;
else if (num_empties == 1) {
num_empties = 0;
const Cubicle *only = 0; // initialize to silence g++ warning
for (const Cubicle* sibling : twin->ortho_adjacents)
if (sibling && !sibling->occupant) {
++num_empties;
only = sibling;
}
// num_empties can't be 0
if (num_empties == 1 && only == cubicle)
return true;
handled |= 1 << (twin - &_cubicles[0]);
}
}
return false;
} // has_orphan() const
// Protected ===================================================================
// Decode letter into Piece
// Used by read() and specify()
//
void Shape::set_cubicle_piece(
Cubicle &cubicle,
const char letter )
{
switch (letter) {
case 'c':
cubicle.occupant = Piece::corner.code();
Piece::corner.pre_place();
break;
case 'p':
cubicle.occupant = Piece::pos.code();
Piece::pos.pre_place();
break;
case 'n':
cubicle.occupant = Piece::neg.code();
Piece::neg.pre_place();
break;
case 'z':
cubicle.occupant = Piece::zee.code();
Piece::zee.pre_place();
break;
case 't':
cubicle.occupant = Piece::tee.code();
Piece::tee.pre_place();
break;
case 'l':
cubicle.occupant = Piece::ell.code();
Piece::ell.pre_place();
break;
case '3':
cubicle.occupant = Piece::three.code();
Piece::three.pre_place();
break;
default:
cubicle.occupant = 0;
break;
}
} // set_cubicle_piece();
bool Shape::prepare_solve(
std::ostream *errors)
{
normalize ();
center ();
generate_symmetries ();
find_adjacent_cubicles();
if (!create_children()) {
if (errors)
*errors << "Has child shape with unsolvable number of cubicles"
<< std::endl;
return false;
}
return true;
} // prepare_solve(std::ostream*)
// Initialize Cubicle::.adjacents[][][] for each _cubicle
// Fills in only needed 6 orthogonal elements of .adjacents
// ((plus superfluous 0,0,0)
// Use of inefficient find_cubicle(Position&) because only called
// once per solve from:
// read()/specify() -> prepare_solve() ->
// create_children() -> find_adjacent_cubicles()
// Then fills Cubicle::ortho_adjacents for subsequent use
// Must do after center() because find_cubicle(Position&) works
// with 2*(x,y,z) indices. See Position::center(...)
//
void Shape::find_adjacent_cubicles()
{
// find adjacent _cubicles
// must do after centering because find_cubicle() works
// using 2*N indexes
for (Cubicle &cubicle : _cubicles) {
for (int z = 0; z < 3 ; ++z)
for (int y = 0 ; y < 3 ; ++y)
for (int x = 0 ; x < 3 ; ++x)
// Only orthogonals (and unneeded 0,0,0)
if ((x - 1) * (y - 1) * (z - 1) == 0) {
// See Position::center() for why 2*(x,y,z)-2
cubicle.adjacents[x][y][z]
= find_cubicle( cubicle
+ Position(2 * x - 2,
2 * y - 2,
2 * z - 2));
}
cubicle.ortho_adjacents[OrthAdj::UP ] = cubicle.adjacents[1][1][2];
cubicle.ortho_adjacents[OrthAdj::DOWN ] = cubicle.adjacents[1][1][0];
cubicle.ortho_adjacents[OrthAdj::FRONT] = cubicle.adjacents[1][2][1];
cubicle.ortho_adjacents[OrthAdj::BACK ] = cubicle.adjacents[1][0][1];
cubicle.ortho_adjacents[OrthAdj::LEFT ] = cubicle.adjacents[0][1][1];
cubicle.ortho_adjacents[OrthAdj::RIGHT] = cubicle.adjacents[2][1][1];
}
} // find_adjacent_cubicles()
// Create _children shapes, one for each separated part of shape
//
bool Shape::create_children()
{
for (Cubicle &cubicle : _cubicles)
if (!cubicle.in_child) {
// For each unprocessed cubicle, populate_child() will
// traverse all orthogonally-connected cubicles
// and mark as processed.
Shape *child = new Shape(0);
_children.push_back(child) ;
populate_child(child, &cubicle);
}
// init each child
for (Shape *child : _children) {
child->normalize ();
child->undo_odd_even ();
child->center ();
child->generate_symmetries();
// sort child cubicles
std::sort(&child->_cubicles[0] ,
&child->_cubicles[0] + child->_num_cubicles);
}
// Check sanity of each child -- no need to attempt solve if
// any is unsolvable.
// Must have 4*n or 4*n+3 cubicles, n>=0 && n<=6 (combination of
// zero or more 4-cubicle pieces with or without 3-cubicle piece)
for (Shape *child : _children)
if ( child->_num_cubicles < 3
|| ( child->_num_cubicles % 4 != 0
&& child->_num_cubicles % 4 != 3))
return false;
return true;
} // create_children()
// Find raw symmetries of shape, based only on rectangular parallelpiped
// bounding box of shape.
// Later, generate_rotator_reflectors() and check_add_symmetric() will
// prune these taking into account actual shape.
//
void Shape::generate_symmetries()
{
// not necessary because only called at initialization, but
// amount of memory is trivial
_symmetries.reserve(Rotators::MAX_NUMBER_OF_ORIENTATIONS);
// always include identity so add_solution() doesn't have to
// special case newly found non-rotated solution
_symmetries.push_back(Rotators::POSX_POSY_POSZ);
// any centered parallelpiped is unchanged when rotated 180 around any axis
_symmetries.push_back(Rotators::NEGX_NEGY_POSZ);
_symmetries.push_back(Rotators::NEGX_POSY_NEGZ);
_symmetries.push_back(Rotators::POSX_NEGY_NEGZ);
// Check for valid 90 degree rotations
//
if (_max_pos.x() == _max_pos.y()) {
_symmetries.push_back(Rotators::NEGY_POSX_POSZ);
// _symmetries.push_back(Rotators::NEGX_NEGY_POSZ);
_symmetries.push_back(Rotators::POSY_NEGX_POSZ);
// _symmetries.push_back(Rotators::NEGX_POSY_NEGZ);
_symmetries.push_back(Rotators::NEGY_NEGX_NEGZ);
// _symmetries.push_back(Rotators::POSX_NEGY_NEGZ);
_symmetries.push_back(Rotators::POSY_POSX_NEGZ);
}
if (_max_pos.x() == _max_pos.z()) {
// _symmetries.push_back(Rotators::POSX_POSY_POSZ);
// _symmetries.push_back(Rotators::NEGX_POSY_NEGZ);
// _symmetries.push_back(Rotators::POSX_NEGY_NEGZ);
_symmetries.push_back(Rotators::NEGZ_POSY_POSX);
_symmetries.push_back(Rotators::POSZ_NEGY_POSX);
_symmetries.push_back(Rotators::POSZ_POSY_NEGX);
_symmetries.push_back(Rotators::NEGZ_NEGY_NEGX);
}
if (_max_pos.y() == _max_pos.z()) {
// _symmetries.push_back(Rotators::POSX_POSY_POSZ);
// _symmetries.push_back(Rotators::NEGX_POSY_NEGZ);
// _symmetries.push_back(Rotators::POSX_NEGY_NEGZ);
_symmetries.push_back(Rotators::POSX_NEGZ_POSY);
_symmetries.push_back(Rotators::NEGX_POSZ_POSY);
_symmetries.push_back(Rotators::POSX_POSZ_NEGY);
_symmetries.push_back(Rotators::NEGX_NEGZ_NEGY);
}
if (_max_pos.x() == _max_pos.y() && _max_pos.y() == _max_pos.z()) {
_symmetries.push_back(Rotators::POSZ_POSX_POSY);
_symmetries.push_back(Rotators::NEGZ_NEGX_POSY);
_symmetries.push_back(Rotators::NEGZ_POSX_NEGY);
_symmetries.push_back(Rotators::POSZ_NEGX_NEGY);
_symmetries.push_back(Rotators::NEGY_NEGZ_POSX);
_symmetries.push_back(Rotators::POSY_POSZ_POSX);
_symmetries.push_back(Rotators::NEGY_POSZ_NEGX);
_symmetries.push_back(Rotators::POSY_NEGZ_NEGX);
}
} // generate_symmetries()
// Undo odd/even dimension indices 1,3,... vs 0,2,4... (see Position::center())
// created by normalize() because center() needs 0,1,2,...
// Used for child shapes because full shape already had normalize()
//
void Shape::undo_odd_even()
{
_max_pos >>= 1;
for (unsigned ndx = 0 ; ndx < _num_cubicles ; ++ndx)
_cubicles[ndx] >>= 1;
} // undo_odd_even()
// Recursively find all orthogonally-connected cubicles from
// starting cubicle (called from create_children()), and
// add (marked as in_child in main shape) to child
//
void Shape::populate_child(
Shape *child ,
Cubicle *cubicle)
{
child->_cubicles[child->_num_cubicles] = *cubicle;
cubicle->in_child = true;
child->_cubicles[child->_num_cubicles++].parent = cubicle;
for (Cubicle *adjacent : cubicle->ortho_adjacents)
if (adjacent && !adjacent->in_child)
populate_child(child, adjacent);
} // populate_child()
// Prune basic list of valid shape rotations in _symmetries created
// by generate_symmetries() based only on rectangular parallelpiped
// bounding box leaving only truly valid ones based on actual shape.
// Also check for unsolvable one-dimensional shapes (two-dimensional is
// OK because valid for child shapes)
// Calls check_add_symmetric() for each rotation in _symmetries.
//
bool Shape::generate_rotator_reflectors(
Shape* const shape ,
std::ostream *errors)
{
// not necessary because only called at initialization, but
// amount of memory is trivial
_rotators_mirrorers.reserve(MAX_ROTATOR_REFLECTORS);
// Check solvable
unsigned num_2_or_3d = 0;
if (_max_pos.z() > 0) ++num_2_or_3d;
if (_max_pos.y() > 0) ++num_2_or_3d;
if (_max_pos.x() > 0) ++num_2_or_3d;
if (num_2_or_3d < 2) {
*errors << "Unsolvable one- or zero-dimensional shape or part of shape"
<< std::endl;
return false;
}
for (unsigned symmetry : shape->_symmetries)
for (unsigned mirror = 0 ; mirror < 2 ; ++mirror)
// no error if not symmetric, just doesn't get added
check_add_symmetric(shape, symmetry, mirror);
return true;
} // generate_rotator_reflectors(Shape*, std::ostream*)
// Called by generate_rotator_reflectors(), above, for
// each rototator/reflector, both plain and mirrored
// Returns true if shape is symmetric after such transformation
//
void Shape::check_add_symmetric(
Shape* const shape ,
const unsigned symmetry,
const bool mirror )
{
std::array<Cubicle, NUMBER_OF_CUBICLES> rotated ;
// Choose which set of mirrored Rotators to use
unsigned mirror_offset = 0;
if (mirror) {
if (_max_pos.z() > 0) mirror_offset = Rotators::Z_MIRRORED_OFFSET;
else mirror_offset = Rotators::X_MIRRORED_OFFSET;
// already checked 1D or 0D in generate_rotator_reflectors
}
// Rotate/mirror shape
for (unsigned ndx = 0 ; ndx < shape->_num_cubicles ; ++ndx) {
Position position = shape->_cubicles[ndx];
rotated[ndx](position.rotate( Rotators::rotator(symmetry
+ mirror_offset )));
}
// Rotation has changed canonical linear ordering
std::sort(rotated.begin(), rotated.begin() + shape->_num_cubicles);
// Check each cubicle, and abort if any is not symmetric
for (unsigned ndx = 0 ; ndx < shape->_num_cubicles ; ++ndx)
if (rotated[ndx] != shape->_cubicles[ndx])
return;
// All were symmetric
shape->_rotators_mirrorers.push_back(symmetry + mirror_offset);
} // check_add_symmetric(Shape* const, const nusigned, const bool)
// Set Cubicle::status for each _cubicle
// For doing symmetry check.
//
void Shape::set_statuses(
Shape* const child ,
const unsigned piece_number,
const char piece_name )
{
if (child->reset_statuses() == child->_num_cubicles)
return; // all cubicles occupied by pieces, no need to continue
// Unrotated signature
Signature signature;
generate_signature_child(signature, 0);
// Fill in for each rotation/reflection
//
child->_piece_rotators_mirrorers[piece_number].clear();
for (unsigned rot_mir_ndx = 1 ;
rot_mir_ndx < child->_rotators_mirrorers.size() ;
++rot_mir_ndx ) {
const unsigned rotator_mirrorer
= child->_rotators_mirrorers[rot_mir_ndx];
// Check and don't mirror "p" and "n" pieces
if ( ( piece_name == Piece::pos.name()
|| piece_name == Piece::neg.name())
&& rotator_mirrorer >= Rotators::Z_MIRRORED_OFFSET)
break;
Signature rotated_signature;
child->generate_rotated_signature(rotated_signature, rotator_mirrorer);
// Add if this rotation/reflection is symmetric
if (rotated_signature == signature)
child->_piece_rotators_mirrorers[piece_number]
.push_back(rotator_mirrorer);
}
// Go through all _cubicles
//
unsigned
num_unset = std::count_if(child->_cubicles.cbegin() ,
child->_cubicles.cbegin() + child->_num_cubicles,
[](Cubicle cubicle) {
return cubicle.parent->status
== Cubicle::Status::UNSET;} );
unsigned primary_ndx = 0;
while (num_unset) {
// Find a yet-unprocessed cubicle
while ( child->_cubicles[primary_ndx].parent->status
!= Cubicle ::Status::UNSET
&& primary_ndx < child->_num_cubicles )
++primary_ndx;
if (primary_ndx == child->_num_cubicles) { // at end
num_unset = 0;
break;
}
// Mark as primary
Cubicle &primary = child->_cubicles[primary_ndx];
primary.parent->status = Cubicle::Status::PRIMARY;
--num_unset;
// Find all symmetric rotations/reflections of primary cubicle
for (const unsigned rotator_mirrorer
: child->_piece_rotators_mirrorers[piece_number]) {
for (unsigned duplicate_ndx = primary_ndx ;
duplicate_ndx < child->_num_cubicles ;
++duplicate_ndx ) {
Cubicle &duplicate = child->_cubicles[duplicate_ndx];
if (duplicate.parent->status != Cubicle::Status::UNSET)
continue; // already processed
Position rotated
= duplicate.rotate( Rotators
::rotator(rotator_mirrorer));
if (rotated == primary) {
// Is rotation/reflection of primary
duplicate.parent->status = Cubicle::Status::DUPLICATE;
--num_unset;
break;
}
}
}
}
} // set_statuses(Shape* const, const unsigned, const char)
// Slightly more efficient version of set_statuses(), above,
//
void Shape::set_statuses_no_children(
const unsigned piece_number,
const char piece_name )
{
if (reset_statuses() == NUMBER_OF_CUBICLES)
return;
Signature signature;
generate_signature(signature);
_piece_rotators_mirrorers[piece_number].clear();
for (unsigned rot_mir_ndx = 1 ;
rot_mir_ndx < _rotators_mirrorers.size() ;
++rot_mir_ndx ) {
const unsigned rotator_mirrorer
= _rotators_mirrorers[rot_mir_ndx];
if ( ( piece_name == Piece::pos.name()
|| piece_name == Piece::neg.name())
&& rotator_mirrorer >= Rotators::Z_MIRRORED_OFFSET)
break;
Signature rotated_signature;
generate_rotated_signature(rotated_signature, rotator_mirrorer);
if (rotated_signature == signature)
_piece_rotators_mirrorers[piece_number].push_back(rotator_mirrorer);
}
unsigned num_unset
= std::count_if(_cubicles.cbegin() ,
_cubicles.cbegin() + _num_cubicles,
[](Cubicle cubicle) {
return cubicle.parent->status
== Cubicle::Status::UNSET;});
unsigned primary_ndx = 0;
while (num_unset) {
while ( _cubicles[primary_ndx].parent->status
!= Cubicle ::Status::UNSET
&& primary_ndx < _num_cubicles )
++primary_ndx;
if (primary_ndx == _num_cubicles) {
num_unset = 0;
break;
}
Cubicle &primary = _cubicles[primary_ndx];
primary.parent->status = Cubicle::Status::PRIMARY;
--num_unset;
for (const unsigned rotator_mirrorer
: _piece_rotators_mirrorers[piece_number]) {