be15856f61
Change copyrights and license headers from Nokia to Digia Change-Id: If1cc974286d29fd01ec6c19dd4719a67f4c3f00e Reviewed-by: Lars Knoll <lars.knoll@digia.com> Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
214 lines
6.7 KiB
C++
214 lines
6.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <math.h>
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#include <QtWidgets>
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#include <QtNetwork>
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#include "slippymap.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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uint qHash(const QPoint& p)
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{
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return p.x() * 17 ^ p.y();
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}
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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 zn = static_cast<qreal>(1 << zoom);
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qreal tx = (lng + 180.0) / 360.0;
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qreal ty = (1.0 - log(tan(lat * M_PI / 180.0) +
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1.0 / cos(lat * M_PI / 180.0)) / M_PI) / 2.0;
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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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qreal lng = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
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return lng;
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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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cache->setCacheDirectory(QDesktopServices::storageLocation
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(QDesktopServices::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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QUrl url = reply->url();
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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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QRect bound = m_tilesRect.adjusted(-2, -2, 2, 2);
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foreach(QPoint tp, m_tilePixmaps.keys())
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if (!bound.contains(tp))
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m_tilePixmaps.remove(tp);
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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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request.setRawHeader("User-Agent", "Nokia (Qt) Graphics Dojo 1.0");
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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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