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Improved dateline crossing handling

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This commit is contained in:
Martin Tůma 2018-09-15 13:40:21 +02:00
parent eda5046518
commit 7432459c93
2 changed files with 20 additions and 16 deletions
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32
src/GUI/pathitem.cpp
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@ -29,7 +29,7 @@ PathItem::PathItem(const Path &path, Map *map, QGraphicsItem *parent)
QBrush brush(Qt::SolidPattern);
_pen = QPen(brush, _width);
updatePainterPath(map);
updatePainterPath();
updateShape();
_marker = new MarkerItem(this);
@ -47,33 +47,35 @@ void PathItem::updateShape()
_shape = s.createStroke(_painterPath);
}
void PathItem::updatePainterPath(Map *map)
void PathItem::addSegment(const Coordinates &c1, const Coordinates &c2)
{
if (fabs(c1.lon() - c2.lon()) > 180.0)
_painterPath.moveTo(_map->ll2xy(c2));
else
_painterPath.lineTo(_map->ll2xy(c2));
}
void PathItem::updatePainterPath()
{
_painterPath = QPainterPath();
_painterPath.moveTo(map->ll2xy(_path.first().coordinates()));
_painterPath.moveTo(_map->ll2xy(_path.first().coordinates()));
for (int i = 1; i < _path.size(); i++) {
const PathPoint &p1 = _path.at(i-1);
const PathPoint &p2 = _path.at(i);
unsigned n = segments(p2.distance() - p1.distance());
if (n > 1) {
Coordinates c1(p1.coordinates());
Coordinates c2(p2.coordinates());
GreatCircle gc(c1, c2);
double prev = c1.lon();
GreatCircle gc(p1.coordinates(), p2.coordinates());
Coordinates last = p1.coordinates();
for (unsigned j = 1; j <= n; j++) {
Coordinates c(gc.pointAt(j/(double)n));
double current = c.lon();
if (fabs(current - prev) > 180.0)
_painterPath.moveTo(map->ll2xy(c));
else
_painterPath.lineTo(map->ll2xy(c));
prev = current;
addSegment(last, c);
last = c;
}
} else
_painterPath.lineTo(map->ll2xy(p2.coordinates()));
addSegment(p1.coordinates(), p2.coordinates());
}
}
@ -99,7 +101,7 @@ void PathItem::setMap(Map *map)
_map = map;
updatePainterPath(map);
updatePainterPath();
updateShape();
_marker->setPos(position(_markerDistance));

4
src/GUI/pathitem.h
View File

@ -43,8 +43,10 @@ protected:
private:
QPointF position(qreal distance) const;
void updatePainterPath(Map *map);
void updatePainterPath();
void updateShape();
void addSegment(const Coordinates &c1, const Coordinates &c2);
void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);