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Now drawing path segments > 1 arc minute as great circle curves instead of rhumb lines

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This commit is contained in:
Martin Tůma 2018-09-13 00:43:28 +02:00
parent 8d1be76043
commit 9957e1834e
5 changed files with 73 additions and 34 deletions
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6
gpxsee.pro
View File

@ -141,7 +141,8 @@ HEADERS += src/config.h \
src/data/locparser.h \
src/data/slfparser.h \
src/map/geotiffmap.h \
src/map/image.h
src/map/image.h \
src/common/greatcircle.h
SOURCES += src/main.cpp \
src/common/coordinates.cpp \
src/common/rectc.cpp \
@ -246,7 +247,8 @@ SOURCES += src/main.cpp \
src/data/locparser.cpp \
src/data/slfparser.cpp \
src/map/geotiffmap.cpp \
src/map/image.cpp
src/map/image.cpp \
src/common/greatcircle.cpp
RESOURCES += gpxsee.qrc
TRANSLATIONS = lang/gpxsee_cs.ts \

40
src/GUI/pathitem.cpp
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@ -2,6 +2,7 @@
#include <QApplication>
#include <QCursor>
#include <QPainter>
#include "common/greatcircle.h"
#include "map/map.h"
#include "tooltip.h"
#include "nicenum.h"
@ -44,8 +45,27 @@ void PathItem::updatePainterPath(Map *map)
_painterPath = QPainterPath();
_painterPath.moveTo(map->ll2xy(_path.first().coordinates()));
for (int i = 1; i < _path.size(); i++)
_painterPath.lineTo(map->ll2xy(_path.at(i).coordinates()));
for (int i = 1; i < _path.size(); i++) {
Coordinates c1(_path.at(i-1).coordinates());
Coordinates c2(_path.at(i).coordinates());
unsigned n = qAbs(c1.lon() - c2.lon());
if (n) {
if (n > 180)
n = n - 180;
double prev = c1.lon();
for (unsigned j = 1; j <= n * 60; j++) {
Coordinates c(GreatCircle::pointAt(c1, c2, j/(n * 60.0)));
double current = c.lon();
if (fabs(current - prev) > 180.0)
_painterPath.moveTo(map->ll2xy(c));
else
_painterPath.lineTo(map->ll2xy(c));
prev = current;
}
} else
_painterPath.lineTo(map->ll2xy(c2));
}
}
void PathItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
@ -141,19 +161,23 @@ QPointF PathItem::position(qreal x) const
return _map->ll2xy(_path.at(mid).coordinates());
}
QLineF l;
Coordinates c1, c2;
qreal p1, p2;
if (_path.at(mid).distance() < x) {
l = QLineF(_map->ll2xy(_path.at(mid).coordinates()),
_map->ll2xy(_path.at(mid+1).coordinates()));
c1 = _path.at(mid).coordinates(); c2 = _path.at(mid+1).coordinates();
p1 = _path.at(mid).distance(); p2 = _path.at(mid+1).distance();
} else {
l = QLineF(_map->ll2xy(_path.at(mid-1).coordinates()),
_map->ll2xy(_path.at(mid).coordinates()));
c1 = _path.at(mid-1).coordinates(); c2 = _path.at(mid).coordinates();
p1 = _path.at(mid-1).distance(); p2 = _path.at(mid).distance();
}
return l.pointAt((x - p1) / (p2 - p1));
if ((unsigned)qAbs(c1.lon() - c2.lon()))
return _map->ll2xy(GreatCircle::pointAt(c1, c2, (x - p1) / (p2 - p1)));
else {
QLineF l(_map->ll2xy(c1), _map->ll2xy(c2));
return l.pointAt((x - p1) / (p2 - p1));
}
}
void PathItem::moveMarker(qreal distance)

23
src/common/greatcircle.cpp Normal file
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@ -0,0 +1,23 @@
#include "greatcircle.h"
Coordinates GreatCircle::pointAt(const Coordinates &c1, const Coordinates &c2,
double f)
{
double lat1 = deg2rad(c1.lat());
double lon1 = deg2rad(c1.lon());
double lat2 = deg2rad(c2.lat());
double lon2 = deg2rad(c2.lon());
double cosLat1 = cos(lat1);
double cosLat2 = cos(lat2);
double d = 2 * asin(sqrt(pow((sin((lat1 - lat2) / 2)), 2) + cosLat1
* cosLat2 * pow(sin((lon1 - lon2) / 2), 2)));
double sinD = sin(d);
double A = sin((1.0-f)*d) / sinD;
double B = sin(f*d) / sinD;
double x = A * cosLat1 * cos(lon1) + B * cosLat2 * cos(lon2);
double y = A * cosLat1 * sin(lon1) + B * cosLat2 * sin(lon2);
double z = A * sin(lat1) + B * sin(lat2);
return Coordinates(rad2deg(atan2(y, x)), rad2deg(atan2(z, sqrt(x*x + y*y))));
}

11
src/common/greatcircle.h Normal file
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@ -0,0 +1,11 @@
#ifndef GREATCIRCLE_H
#define GREATCIRCLE_H
#include "coordinates.h"
namespace GreatCircle
{
Coordinates pointAt(const Coordinates &c1, const Coordinates &c2, double f);
}
#endif // GREATCIRCLE_H

27
src/data/poi.cpp
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@ -1,6 +1,7 @@
#include <QFile>
#include <QDir>
#include "common/rectc.h"
#include "common/greatcircle.h"
#include "data.h"
#include "poi.h"
@ -94,28 +95,6 @@ static bool cb(size_t data, void* context)
return true;
}
static Coordinates intermediate(const Coordinates &c1, const Coordinates &c2,
double f)
{
double lat1 = deg2rad(c1.lat());
double lon1 = deg2rad(c1.lon());
double lat2 = deg2rad(c2.lat());
double lon2 = deg2rad(c2.lon());
double cosLat1 = cos(lat1);
double cosLat2 = cos(lat2);
double d = 2 * asin(sqrt(pow((sin((lat1 - lat2) / 2)), 2) + cosLat1
* cosLat2 * pow(sin((lon1 - lon2) / 2), 2)));
double sinD = sin(d);
double A = sin((1.0-f)*d) / sinD;
double B = sin(f*d) / sinD;
double x = A * cosLat1 * cos(lon1) + B * cosLat2 * cos(lon2);
double y = A * cosLat1 * sin(lon1) + B * cosLat2 * sin(lon2);
double z = A * sin(lat1) + B * sin(lat2);
return Coordinates(rad2deg(atan2(y, x)), rad2deg(atan2(z, sqrt(x*x + y*y))));
}
QList<Waypoint> POI::points(const Path &path) const
{
QList<Waypoint> ret;
@ -128,8 +107,8 @@ QList<Waypoint> POI::points(const Path &path) const
double ds = path.at(i).distance() - path.at(i-1).distance();
unsigned n = (unsigned)ceil(ds / _radius);
for (unsigned j = 0; j < n; j++) {
RectC br(n > 1 ? intermediate(path.at(i-1).coordinates(),
path.at(i).coordinates(), (double)j/(double)n)
RectC br(n > 1 ? GreatCircle::pointAt(path.at(i-1).coordinates(),
path.at(i).coordinates(), (double)j/n)
: path.at(i-1).coordinates(), _radius);
min[0] = br.topLeft().lon();