2022-05-10 10:06:48 +00:00
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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2011-04-27 10:05:43 +00:00
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2011-05-08 07:13:40 +00:00
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#include <QtWidgets>
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2011-04-27 10:05:43 +00:00
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#include <QtNetwork>
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#include "slippymap.h"
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2017-02-21 16:14:37 +00:00
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#include "qmath.h"
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2011-04-27 10:05:43 +00:00
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// tile size in pixels
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const int tdim = 256;
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QPointF tileForCoordinate(qreal lat, qreal lng, int zoom)
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{
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qreal radianLat = qDegreesToRadians(lat);
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2011-04-27 10:05:43 +00:00
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qreal zn = static_cast<qreal>(1 << zoom);
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qreal tx = (lng + 180.0) / 360.0;
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qreal ty = 0.5 - log(tan(radianLat) + 1.0 / cos(radianLat)) / M_PI / 2.0;
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2011-04-27 10:05:43 +00:00
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return QPointF(tx * zn, ty * zn);
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}
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qreal longitudeFromTile(qreal tx, int zoom)
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{
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qreal zn = static_cast<qreal>(1 << zoom);
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qreal lat = tx / zn * 360.0 - 180.0;
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return lat;
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}
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qreal latitudeFromTile(qreal ty, int zoom)
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{
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qreal zn = static_cast<qreal>(1 << zoom);
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qreal n = M_PI - 2 * M_PI * ty / zn;
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return qRadiansToDegrees(atan(sinh(n)));
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2011-04-27 10:05:43 +00:00
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}
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SlippyMap::SlippyMap(QObject *parent)
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: QObject(parent), width(400), height(300), zoom(15),
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latitude(59.9138204), longitude(10.7387413)
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{
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m_emptyTile = QPixmap(tdim, tdim);
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m_emptyTile.fill(Qt::lightGray);
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QNetworkDiskCache *cache = new QNetworkDiskCache;
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2012-09-26 10:42:39 +00:00
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cache->setCacheDirectory(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
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m_manager.setCache(cache);
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connect(&m_manager, SIGNAL(finished(QNetworkReply*)),
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this, SLOT(handleNetworkData(QNetworkReply*)));
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}
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void SlippyMap::invalidate()
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{
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if (width <= 0 || height <= 0)
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return;
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QPointF ct = tileForCoordinate(latitude, longitude, zoom);
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qreal tx = ct.x();
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qreal ty = ct.y();
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// top-left corner of the center tile
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int xp = width / 2 - (tx - floor(tx)) * tdim;
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int yp = height / 2 - (ty - floor(ty)) * tdim;
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// first tile vertical and horizontal
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int xa = (xp + tdim - 1) / tdim;
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int ya = (yp + tdim - 1) / tdim;
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int xs = static_cast<int>(tx) - xa;
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int ys = static_cast<int>(ty) - ya;
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// offset for top-left tile
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m_offset = QPoint(xp - xa * tdim, yp - ya * tdim);
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// last tile vertical and horizontal
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int xe = static_cast<int>(tx) + (width - xp - 1) / tdim;
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int ye = static_cast<int>(ty) + (height - yp - 1) / tdim;
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// build a rect
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m_tilesRect = QRect(xs, ys, xe - xs + 1, ye - ys + 1);
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if (m_url.isEmpty())
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download();
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emit updated(QRect(0, 0, width, height));
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}
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void SlippyMap::render(QPainter *p, const QRect &rect)
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{
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for (int x = 0; x <= m_tilesRect.width(); ++x)
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for (int y = 0; y <= m_tilesRect.height(); ++y) {
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QPoint tp(x + m_tilesRect.left(), y + m_tilesRect.top());
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QRect box = tileRect(tp);
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if (rect.intersects(box)) {
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if (m_tilePixmaps.contains(tp))
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p->drawPixmap(box, m_tilePixmaps.value(tp));
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else
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p->drawPixmap(box, m_emptyTile);
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}
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}
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}
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void SlippyMap::pan(const QPoint &delta)
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{
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QPointF dx = QPointF(delta) / qreal(tdim);
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QPointF center = tileForCoordinate(latitude, longitude, zoom) - dx;
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latitude = latitudeFromTile(center.y(), zoom);
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longitude = longitudeFromTile(center.x(), zoom);
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invalidate();
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}
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void SlippyMap::handleNetworkData(QNetworkReply *reply)
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{
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QImage img;
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QPoint tp = reply->request().attribute(QNetworkRequest::User).toPoint();
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2020-02-10 09:29:57 +00:00
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if (!reply->error())
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if (!img.load(reply, 0))
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img = QImage();
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reply->deleteLater();
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m_tilePixmaps[tp] = QPixmap::fromImage(img);
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if (img.isNull())
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m_tilePixmaps[tp] = m_emptyTile;
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emit updated(tileRect(tp));
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// purge unused spaces
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const QRect bound = m_tilesRect.adjusted(-2, -2, 2, 2);
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for (auto it = m_tilePixmaps.keyBegin(); it != m_tilePixmaps.keyEnd(); ++it) {
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const QPoint &tp = *it;
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if (!bound.contains(tp))
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m_tilePixmaps.remove(tp);
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}
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2011-04-27 10:05:43 +00:00
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download();
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}
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void SlippyMap::download()
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{
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QPoint grab(0, 0);
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for (int x = 0; x <= m_tilesRect.width(); ++x)
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for (int y = 0; y <= m_tilesRect.height(); ++y) {
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QPoint tp = m_tilesRect.topLeft() + QPoint(x, y);
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if (!m_tilePixmaps.contains(tp)) {
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grab = tp;
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break;
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}
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}
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if (grab == QPoint(0, 0)) {
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m_url = QUrl();
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return;
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}
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QString path = "http://tile.openstreetmap.org/%1/%2/%3.png";
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m_url = QUrl(path.arg(zoom).arg(grab.x()).arg(grab.y()));
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QNetworkRequest request;
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request.setUrl(m_url);
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2015-01-28 08:44:43 +00:00
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request.setRawHeader("User-Agent", "The Qt Company (Qt) Graphics Dojo 1.0");
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2011-04-27 10:05:43 +00:00
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request.setAttribute(QNetworkRequest::User, QVariant(grab));
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m_manager.get(request);
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}
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QRect SlippyMap::tileRect(const QPoint &tp)
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{
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QPoint t = tp - m_tilesRect.topLeft();
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int x = t.x() * tdim + m_offset.x();
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int y = t.y() * tdim + m_offset.y();
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return QRect(x, y, tdim, tdim);
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}
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