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-rw-r--r--examples/embedded/lightmaps/slippymap.cpp211
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diff --git a/examples/embedded/lightmaps/slippymap.cpp b/examples/embedded/lightmaps/slippymap.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the demonstration applications of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of The Qt Company Ltd nor the names of its
-** contributors may be used to endorse or promote products derived
-** from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#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);
-}