Import OpenStreetMap example.

Originally it was published in Qt Labs:
http://labs.trolltech.com/blogs/2009/08/04/openstreetmap-and-qt-and-s60/

Reviewed-by: Jason Barron

2 files changed, 585 insertions, 0 deletions

diff --git a/demos/embedded/lightmaps/lightmaps.cpp b/demos/embedded/lightmaps/lightmaps.cpp
new file mode 100644
index 0000000..fdb86fd
--- /dev/null
+++ b/demos/embedded/lightmaps/lightmaps.cpp
@@ -0,0 +1,575 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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();
+    }
+
+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();
+    }
+
+    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();
+}
diff --git a/demos/embedded/lightmaps/lightmaps.pro b/demos/embedded/lightmaps/lightmaps.pro
new file mode 100644
index 0000000..e57d15d
--- /dev/null
+++ b/demos/embedded/lightmaps/lightmaps.pro
@@ -0,0 +1,10 @@
+TEMPLATE = app
+SOURCES = lightmaps.cpp
+QT += network
+
+symbian {
+    HEADERS += $$QT_SOURCE_TREE/examples/network/ftp/sym_iap_util.h
+    LIBS += -lesock  -lconnmon
+    TARGET.CAPABILITY = NetworkServices
+    TARGET.EPOCHEAPSIZE = 0x20000 0x2000000
+}