lightmaps.cpp Example File
demos/embedded/lightmaps/lightmaps.cpp
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#include <QtCore>
#include <QtGui>
#include <QtNetwork>
#include <math.h>
#include "lightmaps.h"
#include "slippymap.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
LightMaps::LightMaps(QWidget *parent)
: 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 LightMaps::setCenter(qreal lat, qreal lng)
{
m_normalMap->latitude = lat;
m_normalMap->longitude = lng;
m_normalMap->invalidate();
m_largeMap->latitude = lat;
m_largeMap->longitude = lng;
m_largeMap->invalidate();
}
void LightMaps::toggleNightMode()
{
invert = !invert;
update();
}
void LightMaps::updateMap(const QRect &r)
{
update(r);
}
void LightMaps::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 LightMaps::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 LightMaps::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 LightMaps::timerEvent(QTimerEvent *)
{
if (!zoomed)
activateZoom();
update();
}
void LightMaps::mousePressEvent(QMouseEvent *event)
{
if (event->buttons() != Qt::LeftButton)
return;
pressed = snapped = true;
pressPos = dragPos = event->pos();
tapTimer.stop();
tapTimer.start(HOLD_TIME, this);
}
void LightMaps::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 LightMaps::mouseReleaseEvent(QMouseEvent *)
{
zoomed = false;
update();
}
void LightMaps::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();
}
}
}
