source: tspsg/src/tspmodel.cpp @ 6b3d3c1bbb

/*
 *  TSPSG: TSP Solver and Generator
 *  Copyright (C) 2007-2009 Lёppa <contacts[at]oleksii[dot]name>
 *
 *  $Id$
 *  $URL$
 *
 *  This file is part of TSPSG.
 *
 *  TSPSG 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.
 *
 *  TSPSG 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 TSPSG.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "tspmodel.h"

CTSPModel::CTSPModel(QObject *parent)
        : QAbstractTableModel(parent), nCities(0)
{
        settings = new QSettings(QSettings::IniFormat,QSettings::UserScope,"TSPSG","tspsg");
}

inline int CTSPModel::rand(int min, int max) const
{
        return min + (int)(((float)qrand() / RAND_MAX) * max);
}

int CTSPModel::rowCount(const QModelIndex &) const
{
        return nCities;
}

int CTSPModel::columnCount(const QModelIndex &) const
{
        return nCities;
}

QVariant CTSPModel::headerData(int section, Qt::Orientation orientation, int role) const
{
        if (role == Qt::DisplayRole) {
                if (orientation == Qt::Vertical)
                        return trUtf8("City %1").arg(section + 1);
                else
                        return trUtf8("%1").arg(section + 1);
        }
        return QVariant();
}

QVariant CTSPModel::data(const QModelIndex &index, int role) const
{
        if (!index.isValid())
                return QVariant();
        if (role == Qt::TextAlignmentRole)
                return int(Qt::AlignCenter);
        else if (role == Qt::FontRole) {
QFont font;
                font.setBold(true);
                return font;
        } else if (role == Qt::DisplayRole || role == Qt::EditRole) {
                if (index.row() < nCities && index.column() < nCities)
                        if (table[index.row()][index.column()] == INFINITY)
                                return trUtf8(INFSTR);
                        else
                                // HACK: Converting to string to prevent spinbox in edit mode
                                return QVariant(table[index.row()][index.column()]).toString();
                else
                        return QVariant();
        } else if (role == Qt::UserRole)
                return table[index.row()][index.column()];
        return QVariant();
}

bool CTSPModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
        if (!index.isValid())
                return false;
        if (role == Qt::EditRole && index.row() != index.column()) {
                if (value.toString().compare(INFSTR) == 0)
                        table[index.row()][index.column()] = INFINITY;
                else {
bool ok;
double tmp = value.toDouble(&ok);
                        if (!ok || tmp < 0)
                                return false;
                        else
                                table[index.row()][index.column()] = tmp;
                }
                emit dataChanged(index,index);
                return true;
        }
        return false;
}

Qt::ItemFlags CTSPModel::flags(const QModelIndex &index) const
{
Qt::ItemFlags flags = QAbstractItemModel::flags(index);
        if (index.row() != index.column())
                flags |= Qt::ItemIsEditable;
        return flags;
}

quint16 CTSPModel::numCities() const
{
        return nCities;
}

void CTSPModel::setNumCities(int n)
{
        if (n == nCities)
                return;
        emit layoutAboutToBeChanged();
        table.resize(n);
        for (int k = 0; k < n; k++) {
                table[k].resize(n);
        }
        if (n > nCities)
                for (int k = nCities; k < n; k++)
                        table[k][k] = INFINITY;
        nCities = n;
        emit layoutChanged();
}

void CTSPModel::clear()
{
        for (int r = 0; r < nCities; r++)
                for (int c = 0; c < nCities; c++)
                        if (r != c)
                                table[r][c] = 0;
        emit dataChanged(index(0,0),index(nCities - 1,nCities - 1));
}

inline bool CTSPModel::loadError(QDataStream::Status status)
{
QString err;
        if (status == QDataStream::Ok)
                return false;
        else if (status == QDataStream::ReadPastEnd)
                err = trUtf8("Unexpected end of file.");
        else if (status == QDataStream::ReadCorruptData)
                err = trUtf8("Corrupt data read. File possibly corrupted.");
        else
                err = trUtf8("Unknown error.");
        QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + err,QMessageBox::Ok).exec();
        return true;
}

bool CTSPModel::loadTask(QString fname)
{
QFile f(fname);
        if (!f.open(QIODevice::ReadOnly)) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),QString(trUtf8("Unable to open task file.\nError: %1")).arg(f.errorString()),QMessageBox::Ok).exec();
                return false;
        }
QDataStream ds(&f);
        ds.setVersion(QDataStream::Qt_4_4);
quint32 sig;
        ds >> sig;
        if (loadError(ds.status()))
                return false;
        ds.device()->reset();
        if (sig == TSPT)
                if (!loadTSPT(&ds)) {
                        f.close();
                        return false;
                }
        else if ((sig >> 16) == ZKT)
                if (!loadZKT(&ds)) {
                        f.close();
                        return false;
                }
        else {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + trUtf8("Unknown file format or file is corrupted."),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        f.close();
        return true;
}

bool CTSPModel::loadTSPT(QDataStream *ds)
{
        // Skipping signature
        ds->skipRawData(sizeof(TSPT));
        if (loadError(ds->status()))
                return false;
        // File version
quint8 version;
        *ds >> version;
        if (loadError(ds->status()))
                return false;
        if (version > TSPT_VERSION) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + trUtf8("File version is newer than application supports.\nPlease, try to update application."),QMessageBox::Ok).exec();
                return false;
        }
        // Skipping metadata
        ds->skipRawData(TSPT_META_SIZE);
        if (loadError(ds->status()))
                return false;
        // Cities number
quint16 size;
        *ds >> size;
        if (loadError(ds->status()))
                return false;
        if (size < 3) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + trUtf8("Unexpected data read.\nFile is possibly corrupted."),QMessageBox::Ok).exec();
                return false;
        }
        if (nCities != size)
                emit numCitiesChanged(size);
        // Costs
        for (int r = 0; r < size; r++)
                for (int c = 0; c < size; c++)
                        if (r != c) {
                                *ds >> table[r][c];
                                if (loadError(ds->status())) {
                                        clear();
                                        return false;
                                }
                        }
        emit dataChanged(index(0,0),index(nCities - 1,nCities - 1));
        return true;
}

bool CTSPModel::loadZKT(QDataStream *ds)
{
        // Skipping signature
        ds->skipRawData(sizeof(ZKT));
        if (loadError(ds->status()))
                return false;
        // File version
quint16 version;
        ds->readRawData(reinterpret_cast<char *>(&version),2);
        if (loadError(ds->status()))
                return false;
        if (version > ZKT_VERSION) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + trUtf8("File version is newer than application supports.\nPlease, try to update application."),QMessageBox::Ok).exec();
                return false;
        }
        // Cities number
quint8 size;
        ds->readRawData(reinterpret_cast<char *>(&size),1);
        if (loadError(ds->status()))
                return false;
        if ((size < 3) || (size > 5)) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Load"),trUtf8("Unable to load task:") + "\n" + trUtf8("Unexpected data read.\nFile is possibly corrupted."),QMessageBox::Ok).exec();
                return false;
        }
        if (nCities != size)
                emit numCitiesChanged(size);
        // Costs
double val;
        for (int r = 0; r < 5; r++)
                for (int c = 0; c < 5; c++)
                        if ((r != c) && (r < size)) {
                                ds->readRawData(reinterpret_cast<char *>(&val),8);
                                if (loadError(ds->status())) {
                                        clear();
                                        return false;
                                }
                                table[r][c] = val;
                        } else {
                                ds->skipRawData(8);
                                if (loadError(ds->status())) {
                                        clear();
                                        return false;
                                }
                        }
        emit dataChanged(index(0,0),index(nCities - 1,nCities - 1));
        return true;
}

bool CTSPModel::saveTask(QString fname)
{
QFile f(fname);
        if (!f.open(QIODevice::WriteOnly)) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),QString(trUtf8("Unable to create task file.\nError: %1\nMaybe, file is read-only?")).arg(f.errorString()),QMessageBox::Ok).exec();
                return false;
        }
QDataStream ds(&f);
        ds.setVersion(QDataStream::Qt_4_4);
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // File signature
        ds << TSPT;
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // File version
        ds << TSPT_VERSION;
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // File metadata version
        ds << TSPT_META_VERSION;
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // Metadata
        ds << OSID;
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // Number of cities
        ds << nCities;
        if (f.error() != QFile::NoError) {
                QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                f.close();
                return false;
        }
        // Costs
        for (int r = 0; r < nCities; r++)
                for (int c = 0; c < nCities; c++)
                        if (r != c) {
                                ds << table[r][c];
                                if (f.error() != QFile::NoError) {
                                        QMessageBox(QMessageBox::Critical,trUtf8("Task Save"),trUtf8("Unable to save task.\nError: %1").arg(f.errorString()),QMessageBox::Ok).exec();
                                        f.close();
                                        return false;
                                }
                        }
        f.close();
        return true;
}

void CTSPModel::randomize()
{
int randMin = settings->value("MinCost",DEF_RAND_MIN).toInt();
int randMax = settings->value("MaxCost",DEF_RAND_MAX).toInt();
        for (int r = 0; r < nCities; r++)
                for (int c = 0; c < nCities; c++)
                        if (r != c)
                                table[r][c] = rand(randMin,randMax);
        emit dataChanged(index(0,0),index(nCities - 1,nCities - 1));
}