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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore>
+#include <QtGui>
+#include <QtNetwork>
+
+#if defined (Q_OS_SYMBIAN)
+#include "sym_iap_util.h"
+#endif
+
+#include <math.h>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+// how long (milliseconds) the user need to hold (after a tap on the screen)
+// before triggering the magnifying glass feature
+// 701, a prime number, is the sum of 229, 233, 239
+// (all three are also prime numbers, consecutive!)
+#define HOLD_TIME 701
+
+// maximum size of the magnifier
+// Hint: see above to find why I picked this one :)
+#define MAX_MAGNIFIER 229
+
+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 zn = static_cast<qreal>(1 << zoom);
+ qreal tx = (lng + 180.0) / 360.0;
+ qreal ty = (1.0 - log(tan(lat * M_PI / 180.0) +
+ 1.0 / cos(lat * M_PI / 180.0)) / 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;
+ qreal lng = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
+ return lng;
+}
+
+class SlippyMap: public QObject
+{
+ Q_OBJECT
+
+public:
+ int width;
+ int height;
+ int zoom;
+ qreal latitude;
+ qreal longitude;
+
+ SlippyMap(QObject *parent = 0)
+ : 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(QDesktopServices::storageLocation
+ (QDesktopServices::CacheLocation));
+ m_manager.setCache(cache);
+ connect(&m_manager, SIGNAL(finished(QNetworkReply*)),
+ this, SLOT(handleNetworkData(QNetworkReply*)));
+ }
+
+ void 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 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 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();
+ }
+
+private slots:
+
+ void handleNetworkData(QNetworkReply *reply) {
+ QImage img;
+ QPoint tp = reply->request().attribute(QNetworkRequest::User).toPoint();
+ QUrl url = reply->url();
+ 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
+ QRect bound = m_tilesRect.adjusted(-2, -2, 2, 2);
+ foreach(QPoint tp, m_tilePixmaps.keys())
+ if (!bound.contains(tp))
+ m_tilePixmaps.remove(tp);
+
+ download();
+ }
+
+ void 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", "Nokia (Qt) Graphics Dojo 1.0");
+ request.setAttribute(QNetworkRequest::User, QVariant(grab));
+ m_manager.get(request);
+ }
+
+signals:
+ void updated(const QRect &rect);
+
+protected:
+ QRect 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);
+ }
+
+private:
+ QPoint m_offset;
+ QRect m_tilesRect;
+ QPixmap m_emptyTile;
+ QHash<QPoint, QPixmap> m_tilePixmaps;
+ QNetworkAccessManager m_manager;
+ QUrl m_url;
+};
+
+class LightMaps: public QWidget
+{
+ Q_OBJECT
+
+public:
+ LightMaps(QWidget *parent = 0)
+ : QWidget(parent)
+ , pressed(false)
+ , snapped(false)
+ , zoomed(false)
+ , invert(false) {
+ m_normalMap = new SlippyMap(this);
+ m_largeMap = new SlippyMap(this);
+ connect(m_normalMap, SIGNAL(updated(QRect)), SLOT(updateMap(QRect)));
+ connect(m_largeMap, SIGNAL(updated(QRect)), SLOT(update()));
+ }
+
+ void setCenter(qreal lat, qreal lng) {
+ m_normalMap->latitude = lat;
+ m_normalMap->longitude = lng;
+ m_normalMap->invalidate();
+ m_largeMap->invalidate();
+ }
+
+public slots:
+ void toggleNightMode() {
+ invert = !invert;
+ update();
+ }
+
+private slots:
+ void updateMap(const QRect &r) {
+ update(r);
+ }
+
+protected:
+
+ void activateZoom() {
+ zoomed = true;
+ tapTimer.stop();
+ m_largeMap->zoom = m_normalMap->zoom + 1;
+ m_largeMap->width = m_normalMap->width * 2;
+ m_largeMap->height = m_normalMap->height * 2;
+ m_largeMap->latitude = m_normalMap->latitude;
+ m_largeMap->longitude = m_normalMap->longitude;
+ m_largeMap->invalidate();
+ update();
+ }
+
+ void resizeEvent(QResizeEvent *) {
+ m_normalMap->width = width();
+ m_normalMap->height = height();
+ m_normalMap->invalidate();
+ m_largeMap->width = m_normalMap->width * 2;
+ m_largeMap->height = m_normalMap->height * 2;
+ m_largeMap->invalidate();
+ }
+
+ void paintEvent(QPaintEvent *event) {
+ QPainter p;
+ p.begin(this);
+ m_normalMap->render(&p, event->rect());
+ p.setPen(Qt::black);
+#if defined(Q_OS_SYMBIAN)
+ QFont font = p.font();
+ font.setPixelSize(13);
+ p.setFont(font);
+#endif
+ p.drawText(rect(), Qt::AlignBottom | Qt::TextWordWrap,
+ "Map data CCBYSA 2009 OpenStreetMap.org contributors");
+ p.end();
+
+ if (zoomed) {
+ int dim = qMin(width(), height());
+ int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3);
+ int radius = magnifierSize / 2;
+ int ring = radius - 15;
+ QSize box = QSize(magnifierSize, magnifierSize);
+
+ // reupdate our mask
+ if (maskPixmap.size() != box) {
+ maskPixmap = QPixmap(box);
+ maskPixmap.fill(Qt::transparent);
+
+ QRadialGradient g;
+ g.setCenter(radius, radius);
+ g.setFocalPoint(radius, radius);
+ g.setRadius(radius);
+ g.setColorAt(1.0, QColor(255, 255, 255, 0));
+ g.setColorAt(0.5, QColor(128, 128, 128, 255));
+
+ QPainter mask(&maskPixmap);
+ mask.setRenderHint(QPainter::Antialiasing);
+ mask.setCompositionMode(QPainter::CompositionMode_Source);
+ mask.setBrush(g);
+ mask.setPen(Qt::NoPen);
+ mask.drawRect(maskPixmap.rect());
+ mask.setBrush(QColor(Qt::transparent));
+ mask.drawEllipse(g.center(), ring, ring);
+ mask.end();
+ }
+
+ QPoint center = dragPos - QPoint(0, radius);
+ center = center + QPoint(0, radius / 2);
+ QPoint corner = center - QPoint(radius, radius);
+
+ QPoint xy = center * 2 - QPoint(radius, radius);
+
+ // only set the dimension to the magnified portion
+ if (zoomPixmap.size() != box) {
+ zoomPixmap = QPixmap(box);
+ zoomPixmap.fill(Qt::lightGray);
+ }
+ if (true) {
+ QPainter p(&zoomPixmap);
+ p.translate(-xy);
+ m_largeMap->render(&p, QRect(xy, box));
+ p.end();
+ }
+
+ QPainterPath clipPath;
+ clipPath.addEllipse(center, ring, ring);
+
+ QPainter p(this);
+ p.setRenderHint(QPainter::Antialiasing);
+ p.setClipPath(clipPath);
+ p.drawPixmap(corner, zoomPixmap);
+ p.setClipping(false);
+ p.drawPixmap(corner, maskPixmap);
+ p.setPen(Qt::gray);
+ p.drawPath(clipPath);
+ }
+ if (invert) {
+ QPainter p(this);
+ p.setCompositionMode(QPainter::CompositionMode_Difference);
+ p.fillRect(event->rect(), Qt::white);
+ p.end();
+ }
+ }
+
+ void timerEvent(QTimerEvent *) {
+ if (!zoomed)
+ activateZoom();
+ update();
+ }
+
+ void mousePressEvent(QMouseEvent *event) {
+ if (event->buttons() != Qt::LeftButton)
+ return;
+ pressed = snapped = true;
+ pressPos = dragPos = event->pos();
+ tapTimer.stop();
+ tapTimer.start(HOLD_TIME, this);
+ }
+
+ void mouseMoveEvent(QMouseEvent *event) {
+ if (!event->buttons())
+ return;
+ if (!zoomed) {
+ if (!pressed || !snapped) {
+ QPoint delta = event->pos() - pressPos;
+ pressPos = event->pos();
+ m_normalMap->pan(delta);
+ return;
+ } else {
+ const int threshold = 10;
+ QPoint delta = event->pos() - pressPos;
+ if (snapped) {
+ snapped &= delta.x() < threshold;
+ snapped &= delta.y() < threshold;
+ snapped &= delta.x() > -threshold;
+ snapped &= delta.y() > -threshold;
+ }
+ if (!snapped)
+ tapTimer.stop();
+ }
+ } else {
+ dragPos = event->pos();
+ update();
+ }
+ }
+
+ void mouseReleaseEvent(QMouseEvent *) {
+ zoomed = false;
+ update();
+ }
+
+ void keyPressEvent(QKeyEvent *event) {
+ if (!zoomed) {
+ if (event->key() == Qt::Key_Left)
+ m_normalMap->pan(QPoint(20, 0));
+ if (event->key() == Qt::Key_Right)
+ m_normalMap->pan(QPoint(-20, 0));
+ if (event->key() == Qt::Key_Up)
+ m_normalMap->pan(QPoint(0, 20));
+ if (event->key() == Qt::Key_Down)
+ m_normalMap->pan(QPoint(0, -20));
+ if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
+ dragPos = QPoint(width() / 2, height() / 2);
+ activateZoom();
+ }
+ } else {
+ if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
+ zoomed = false;
+ update();
+ }
+ QPoint delta(0, 0);
+ if (event->key() == Qt::Key_Left)
+ delta = QPoint(-15, 0);
+ if (event->key() == Qt::Key_Right)
+ delta = QPoint(15, 0);
+ if (event->key() == Qt::Key_Up)
+ delta = QPoint(0, -15);
+ if (event->key() == Qt::Key_Down)
+ delta = QPoint(0, 15);
+ if (delta != QPoint(0, 0)) {
+ dragPos += delta;
+ update();
+ }
+ }
+ }
+
+private:
+ SlippyMap *m_normalMap;
+ SlippyMap *m_largeMap;
+ bool pressed;
+ bool snapped;
+ QPoint pressPos;
+ QPoint dragPos;
+ QBasicTimer tapTimer;
+ bool zoomed;
+ QPixmap zoomPixmap;
+ QPixmap maskPixmap;
+ bool invert;
+};
+
+class MapZoom : public QMainWindow
+{
+ Q_OBJECT
+
+private:
+ LightMaps *map;
+
+public:
+ MapZoom(): QMainWindow(0) {
+ map = new LightMaps(this);
+ setCentralWidget(map);
+ map->setFocus();
+
+ QAction *osloAction = new QAction("&Oslo", this);
+ QAction *berlinAction = new QAction("&Berlin", this);
+ QAction *jakartaAction = new QAction("&Jakarta", this);
+ QAction *nightModeAction = new QAction("Night Mode", this);
+ nightModeAction->setCheckable(true);
+ nightModeAction->setChecked(false);
+ QAction *osmAction = new QAction("About OpenStreetMap", this);
+ connect(osloAction, SIGNAL(triggered()), SLOT(chooseOslo()));
+ connect(berlinAction, SIGNAL(triggered()), SLOT(chooseBerlin()));
+ connect(jakartaAction, SIGNAL(triggered()), SLOT(chooseJakarta()));
+ connect(nightModeAction, SIGNAL(triggered()), map, SLOT(toggleNightMode()));
+ connect(osmAction, SIGNAL(triggered()), SLOT(aboutOsm()));
+
+#if defined(Q_OS_SYMBIAN)
+ menuBar()->addAction(osloAction);
+ menuBar()->addAction(berlinAction);
+ menuBar()->addAction(jakartaAction);
+ menuBar()->addAction(nightModeAction);
+ menuBar()->addAction(osmAction);
+#else
+ QMenu *menu = menuBar()->addMenu("&Options");
+ menu->addAction(osloAction);
+ menu->addAction(berlinAction);
+ menu->addAction(jakartaAction);
+ menu->addSeparator();
+ menu->addAction(nightModeAction);
+ menu->addAction(osmAction);
+#endif
+
+ QTimer::singleShot(0, this, SLOT(delayedInit()));
+ }
+
+private slots:
+
+ void delayedInit() {
+#if defined(Q_OS_SYMBIAN)
+ qt_SetDefaultIap();
+#endif
+ }
+
+ void chooseOslo() {
+ map->setCenter(59.9138204, 10.7387413);
+ }
+
+ void chooseBerlin() {
+ map->setCenter(52.52958999943302, 13.383053541183472);
+ }
+
+ void chooseJakarta() {
+ map->setCenter(-6.211544, 106.845172);
+ }
+
+ void aboutOsm() {
+ QDesktopServices::openUrl(QUrl("http://www.openstreetmap.org"));
+ }
+};
+
+
+#include "lightmaps.moc"
+
+int main(int argc, char **argv)
+{
+#if defined(Q_WS_X11)
+ QApplication::setGraphicsSystem("raster");
+#endif
+
+ QApplication app(argc, argv);
+ app.setApplicationName("LightMaps");
+
+ MapZoom w;
+ w.setWindowTitle("OpenStreetMap");
+#if defined(Q_OS_SYMBIAN)
+ w.showMaximized();
+#else
+ w.resize(600, 450);
+ w.show();
+#endif
+
+ return app.exec();
+}
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