| /**************************************************************************** |
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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the demonstration applications of the Qt Toolkit. |
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| |
| #include <QtWidgets> |
| #include <QtNetwork> |
| #include "slippymap.h" |
| #include "qmath.h" |
| |
| uint qHash(const QPoint& p) |
| { |
| return p.x() * 17 ^ p.y(); |
| } |
| |
| // tile size in pixels |
| const int tdim = 256; |
| |
| QPointF tileForCoordinate(qreal lat, qreal lng, int zoom) |
| { |
| qreal radianLat = qDegreesToRadians(lat); |
| qreal zn = static_cast<qreal>(1 << zoom); |
| qreal tx = (lng + 180.0) / 360.0; |
| qreal ty = 0.5 - log(tan(radianLat) + 1.0 / cos(radianLat)) / M_PI / 2.0; |
| return QPointF(tx * zn, ty * zn); |
| } |
| |
| qreal longitudeFromTile(qreal tx, int zoom) |
| { |
| qreal zn = static_cast<qreal>(1 << zoom); |
| qreal lat = tx / zn * 360.0 - 180.0; |
| return lat; |
| } |
| |
| qreal latitudeFromTile(qreal ty, int zoom) |
| { |
| qreal zn = static_cast<qreal>(1 << zoom); |
| qreal n = M_PI - 2 * M_PI * ty / zn; |
| return qRadiansToDegrees(atan(sinh(n))); |
| } |
| |
| |
| SlippyMap::SlippyMap(QObject *parent) |
| : QObject(parent), width(400), height(300), zoom(15), |
| latitude(59.9138204), longitude(10.7387413) |
| { |
| m_emptyTile = QPixmap(tdim, tdim); |
| m_emptyTile.fill(Qt::lightGray); |
| |
| QNetworkDiskCache *cache = new QNetworkDiskCache; |
| cache->setCacheDirectory(QStandardPaths::writableLocation(QStandardPaths::CacheLocation)); |
| m_manager.setCache(cache); |
| connect(&m_manager, SIGNAL(finished(QNetworkReply*)), |
| this, SLOT(handleNetworkData(QNetworkReply*))); |
| } |
| |
| void SlippyMap::invalidate() |
| { |
| if (width <= 0 || height <= 0) |
| return; |
| |
| QPointF ct = tileForCoordinate(latitude, longitude, zoom); |
| qreal tx = ct.x(); |
| qreal ty = ct.y(); |
| |
| // top-left corner of the center tile |
| int xp = width / 2 - (tx - floor(tx)) * tdim; |
| int yp = height / 2 - (ty - floor(ty)) * tdim; |
| |
| // first tile vertical and horizontal |
| int xa = (xp + tdim - 1) / tdim; |
| int ya = (yp + tdim - 1) / tdim; |
| int xs = static_cast<int>(tx) - xa; |
| int ys = static_cast<int>(ty) - ya; |
| |
| // offset for top-left tile |
| m_offset = QPoint(xp - xa * tdim, yp - ya * tdim); |
| |
| // last tile vertical and horizontal |
| int xe = static_cast<int>(tx) + (width - xp - 1) / tdim; |
| int ye = static_cast<int>(ty) + (height - yp - 1) / tdim; |
| |
| // build a rect |
| m_tilesRect = QRect(xs, ys, xe - xs + 1, ye - ys + 1); |
| |
| if (m_url.isEmpty()) |
| download(); |
| |
| emit updated(QRect(0, 0, width, height)); |
| } |
| |
| void SlippyMap::render(QPainter *p, const QRect &rect) |
| { |
| for (int x = 0; x <= m_tilesRect.width(); ++x) |
| for (int y = 0; y <= m_tilesRect.height(); ++y) { |
| QPoint tp(x + m_tilesRect.left(), y + m_tilesRect.top()); |
| QRect box = tileRect(tp); |
| if (rect.intersects(box)) { |
| if (m_tilePixmaps.contains(tp)) |
| p->drawPixmap(box, m_tilePixmaps.value(tp)); |
| else |
| p->drawPixmap(box, m_emptyTile); |
| } |
| } |
| } |
| |
| void SlippyMap::pan(const QPoint &delta) |
| { |
| QPointF dx = QPointF(delta) / qreal(tdim); |
| QPointF center = tileForCoordinate(latitude, longitude, zoom) - dx; |
| latitude = latitudeFromTile(center.y(), zoom); |
| longitude = longitudeFromTile(center.x(), zoom); |
| invalidate(); |
| } |
| |
| void SlippyMap::handleNetworkData(QNetworkReply *reply) |
| { |
| QImage img; |
| QPoint tp = reply->request().attribute(QNetworkRequest::User).toPoint(); |
| if (!reply->error()) |
| if (!img.load(reply, 0)) |
| img = QImage(); |
| reply->deleteLater(); |
| m_tilePixmaps[tp] = QPixmap::fromImage(img); |
| if (img.isNull()) |
| m_tilePixmaps[tp] = m_emptyTile; |
| emit updated(tileRect(tp)); |
| |
| // purge unused spaces |
| const QRect bound = m_tilesRect.adjusted(-2, -2, 2, 2); |
| for (auto it = m_tilePixmaps.keyBegin(); it != m_tilePixmaps.keyEnd(); ++it) { |
| const QPoint &tp = *it; |
| if (!bound.contains(tp)) |
| m_tilePixmaps.remove(tp); |
| } |
| |
| download(); |
| } |
| |
| void SlippyMap::download() |
| { |
| QPoint grab(0, 0); |
| for (int x = 0; x <= m_tilesRect.width(); ++x) |
| for (int y = 0; y <= m_tilesRect.height(); ++y) { |
| QPoint tp = m_tilesRect.topLeft() + QPoint(x, y); |
| if (!m_tilePixmaps.contains(tp)) { |
| grab = tp; |
| break; |
| } |
| } |
| if (grab == QPoint(0, 0)) { |
| m_url = QUrl(); |
| return; |
| } |
| |
| QString path = "http://tile.openstreetmap.org/%1/%2/%3.png"; |
| m_url = QUrl(path.arg(zoom).arg(grab.x()).arg(grab.y())); |
| QNetworkRequest request; |
| request.setUrl(m_url); |
| request.setRawHeader("User-Agent", "The Qt Company (Qt) Graphics Dojo 1.0"); |
| request.setAttribute(QNetworkRequest::User, QVariant(grab)); |
| m_manager.get(request); |
| } |
| |
| QRect SlippyMap::tileRect(const QPoint &tp) |
| { |
| QPoint t = tp - m_tilesRect.topLeft(); |
| int x = t.x() * tdim + m_offset.x(); |
| int y = t.y() * tdim + m_offset.y(); |
| return QRect(x, y, tdim, tdim); |
| } |