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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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#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
<span class="comment"> // how long (milliseconds) the user need to hold (after a tap on the screen)</span>
<span class="comment"> // before triggering the magnifying glass feature</span>
<span class="comment"> // 701, a prime number, is the sum of 229, 233, 239</span>
<span class="comment"> // (all three are also prime numbers, consecutive</span>!)
#define HOLD_TIME 701
<span class="comment"> // maximum size of the magnifier</span>
<span class="comment"> // Hint: see above to find why I picked this one :)</span>
#define MAX_MAGNIFIER 229
uint qHash(const QPoint& p)
{
return p.x() * 17 ^ p.y();
}
<span class="comment"> // tile size in pixels</span>
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();
<span class="comment">// top-left corner of the center tile</span>
int xp = width / 2 - (tx - floor(tx)) * tdim;
int yp = height / 2 - (ty - floor(ty)) * tdim;
<span class="comment">// first tile vertical and horizontal</span>
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;
<span class="comment">// offset for top-left tile</span>
m_offset = QPoint(xp - xa * tdim, yp - ya * tdim);
<span class="comment">// last tile vertical and horizontal</span>
int xe = static_cast<int>(tx) + (width - xp - 1) / tdim;
int ye = static_cast<int>(ty) + (height - yp - 1) / tdim;
<span class="comment">// build a rect</span>
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));
<span class="comment">// purge unused spaces</span>
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:<span class="comment">//tile.openstreetmap.org/%1/%2/%3.png";</span>
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);
<span class="comment">// reupdate our mask</span>
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);
<span class="comment">// only set the dimension to the magnified portion</span>
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) || defined(Q_OS_WINCE_WM)
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:<span class="comment">//www.openstreetmap.org"));</span>
}
};
#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) || defined(Q_OS_WINCE_WM)
w.showMaximized();
#else
w.resize(600, 450);
w.show();
#endif
return app.exec();
}</pre>
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