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/*
* Copyright (C) 2023, KylinSoft Co., Ltd.
*
* 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 3, 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, see <http://www.gnu.org/licenses/>.
*
**/
#include "zoneinfo.h"
#include <cmath>
#include <QDebug>
#include <locale.h>
#include <libintl.h>
const QString zoneTabFile = "/usr/share/zoneinfo/zone.tab";
const char kTimezoneDomain[] = "installer-timezones";
const char kDefaultLocale[] = "en_US.UTF-8";
const QString kcnBj = "北京";
const QString kenBj = "Asia/Beijing";
QString ZoneInfo::readRile(const QString& filepath) {
QFile file(filepath);
if(file.exists()) {
if(!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
qWarning() << "ReadFile() failed to open" << filepath;
return "";
}
QTextStream textStream(&file);
QString res= textStream.readAll();
file.close();
return res;
} else {
qWarning() << filepath << " not found"<<endl;
return "";
}
}
//经度纬度坐标转换【https://en.wikipedia.org/wiki/List_of_tz_database_time_zones】
double ZoneInfo::convertoPos(const QString &pos, int num) {
if(pos.length() < 4){
return 0.0;
}
QString integer = pos.left(num + 1);
QString decimal = pos.mid(num + 1);
double fra_1 = integer.toDouble();
double fra_2 = decimal.toDouble();
if(fra_1 >= 0.0) {
return fra_1 + fra_2 / pow(10, decimal.length());
} else {
return fra_1 - fra_2 / pow(10, decimal.length());
}
}
ZoneinfoList ZoneInfo::getzoneInforList() {
ZoneinfoList list;
QString content(this->readRile(zoneTabFile));
if (!content.contains("Asia/Beijing")){
content = content + "\n CN +3955+11626 Asia/Beijing China Standard Time \n";
}
for (const QString& line : content.split('\n')) {
if(!line.startsWith('#')) {
const QStringList details(line.split('\t'));
//解析数据
if(details.length() >= 3) {
QString coordinate = details.at(1);
int index = coordinate.indexOf('+',3);
if(index == -1) {
index = coordinate.indexOf('-', 3);
}
Q_ASSERT(index > -1);
double latitude = convertoPos(coordinate.left(index), 2);
double longtitude = convertoPos(coordinate.mid(index), 3);
// if ("+3114" == coordinate.left(index)) {
// latitude = convertoPos("+3992", 2);
// }
// if ("+12128" == coordinate.mid(index)) {
// longtitude = convertoPos("+11646", 3);
// }
ZoneInfo_ zoneinfo_ = {details.at(0), details.at(2), latitude, longtitude,0.0};
list.append(zoneinfo_);
}
}
}
return list;
}
QString ZoneInfo::getCurrentTimzone() {
QString timezone = this->readRile("/etc/timezone");
return timezone.trimmed();
}
int ZoneInfo::getZoneInfoByZone(ZoneinfoList list, QString timezone) {
int index = -1;
for(ZoneInfo_ info : list) {
index++;
if (info.timezone == timezone) {
return index;
}
}
return -1;
}
QString ZoneInfo::getLocalTimezoneName(QString timezone, QString locale) {
(void) setlocale(LC_ALL, QString(locale + ".UTF-8").toStdString().c_str());
const QString local_name(dgettext(kTimezoneDomain,
timezone.toStdString().c_str()));
int index = local_name.lastIndexOf('/');
if (index == -1) {
// Some translations of locale name contains non-standard char.
index = local_name.lastIndexOf("∕");
}
// Reset locale.
(void) setlocale(LC_ALL, kDefaultLocale);
// if ("Asia/Shanghai" == timezone) {
// if (QLocale::system().name() == "zh_CN") {
// return kcnBj;
// } else {
// return kenBj;
// }
// }
return (index > -1) ? local_name.mid(index + 1) : local_name;
}
double ZoneInfo::radians(double degrees) {
return (degrees / 360.0) * M_PI * 2;
}
double ZoneInfo::converLongtitudeToX(double longitude, double map_width) {
const double xdeg_offset = -6;
double x;
x = (map_width * (180.0 + longitude) / 360.0)
+ (map_width * xdeg_offset / 180.0);
return x;
}
double ZoneInfo::converLatitudeToY(double latitude, double map_height) {
double bottom_lat = -59;
double top_lat = 81;
double top_per, y, full_range, top_offset, map_range;
top_per = top_lat / 180.0;
y = 1.25 * log (tan (M_PI_4 + 0.4 * radians (latitude)));
full_range = 4.6068250867599998;
top_offset = full_range * top_per;
map_range = fabs (1.25 * log (tan (M_PI_4 + 0.4 * radians (bottom_lat))) - top_offset);
y = fabs (y - top_offset);
y = y / map_range;
y = y * map_height;
return y;
}
ZoneinfoList ZoneInfo::getNearestZones(ZoneinfoList total_zones, double threshold, int x, int y, int map_width, int map_height) {
ZoneinfoList zones;
double minimum_distance = map_width * map_width + map_height * map_height;
int nearest_zone_index = -1;
for (int index = 0; index < total_zones.length(); index++) {
const ZoneInfo_& zone = total_zones.at(index);
const double point_x = converLongtitudeToX(zone.longtitude, map_width);
const double point_y = converLatitudeToY(zone.latitude, map_height);
const double dx = point_x - x;
const double dy = point_y - y;
const double distance = dx * dx + dy * dy;
if (distance < minimum_distance) {
minimum_distance = distance;
nearest_zone_index = index;
}
if (distance <= threshold) {
zones.append(zone);
}
}
// Get the nearest zone.
if (zones.isEmpty()) {
zones.append(total_zones.at(nearest_zone_index));
}
return zones;
}
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