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Code

speed up scaling of the gpx track

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This commit is contained in:
Niels 2010-06-15 15:31:27 +02:00
parent e00325730b
commit ca3823c18f
2 changed files with 28 additions and 3 deletions
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28
mapwidget.cpp
View File

@ -580,13 +580,14 @@ void MapWidget::reloadPixmaps()
void MapWidget::updateTrack()
{
if (m_track.count() > 1) {
int scale = 1 << m_level;
m_trackOnScreen.clear();
m_trackOffset = geo2screen(m_track.first().x(), m_track.first().y());
m_trackOffset = raw2screen(m_track.first().x(), m_track.first().y(), scale);
m_trackOnScreen << QPoint(0, 0);
for (int i = 1; i < m_track.count(); ++i) {
QPointF p = m_track.at(i);
if (!p.isNull()) {
m_trackOnScreen << geo2screen(p.x(), p.y()) - m_trackOffset;
m_trackOnScreen << raw2screen(p.x(), p.y(), scale) - m_trackOffset;
} else {
m_trackOnScreen << QPoint();
}
@ -716,7 +717,7 @@ void MapWidget::loadGpx(const QString &filename)
float lat = xml.attributes().value("lat").toString().toFloat();
float lon = xml.attributes().value("lon").toString().toFloat();
points << QPointF(lon, lat);
points << QPointF(lon2rawx(lon), lat2rawy(lat));
} else if (xml.name() == "ele") {
tag2 = "ele";
} else if (xml.name() == "time") {
@ -900,6 +901,27 @@ QPoint MapWidget::geo2screen(qreal lon, qreal lat) const
return QPoint(x, y);
}
QPoint MapWidget::raw2screen(qreal x, qreal y, int scale) const
{
qreal tx = x * scale;
qreal ty = y * scale;
int sx = (tx * m_pixWidth) - ((m_indexX * m_pixWidth) - m_pos.x());
int sy = (ty * m_pixHeight) - ((m_indexY * m_pixHeight) - m_pos.y());
return QPoint(sx, sy);
}
qreal MapWidget::lon2rawx(qreal lon) const
{
return (lon + 180.0) / 360.0;
}
qreal MapWidget::lat2rawy(qreal lat) const
{
return (1.0 - log(tan(lat * M_PI/180.0) + 1.0 / cos(lat * M_PI/180.0)) / M_PI) / 2.0;
}
qreal MapWidget::lon2tilex(qreal lon, int z) const
{
return (lon + 180.0) / 360.0 * (1 << z);

3
mapwidget.h
View File

@ -71,6 +71,9 @@ private:
QRectF geoRect() const;
QPointF geoPos() const;
QPoint geo2screen(qreal lon, qreal lat) const;
QPoint raw2screen(qreal x, qreal y, int scale) const;
qreal lon2rawx(qreal lon) const;
qreal lat2rawy(qreal lat) const;
qreal lon2tilex(qreal lon, int z) const;
qreal lat2tiley(qreal lat, int z) const;
qreal tilex2lon(qreal x, int z) const;