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Diffstat (limited to 'examples/embedded/lightmaps/slippymap.cpp')
-rw-r--r-- | examples/embedded/lightmaps/slippymap.cpp | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/examples/embedded/lightmaps/slippymap.cpp b/examples/embedded/lightmaps/slippymap.cpp deleted file mode 100644 index 76ac80bfaa..0000000000 --- a/examples/embedded/lightmaps/slippymap.cpp +++ /dev/null @@ -1,164 +0,0 @@ -// Copyright (C) 2016 The Qt Company Ltd. -// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause - -#include <QtWidgets> -#include <QtNetwork> -#include "slippymap.h" -#include "qmath.h" - -// 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); -} |