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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); QBrush brush(Qt::SolidPattern);
_pen = QPen(brush, _width); _pen = QPen(brush, _width);
updatePainterPath(map); updatePainterPath();
updateShape(); updateShape();
_marker = new MarkerItem(this); _marker = new MarkerItem(this);
@ -47,33 +47,35 @@ void PathItem::updateShape()
_shape = s.createStroke(_painterPath); _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 = QPainterPath();
_painterPath.moveTo(map->ll2xy(_path.first().coordinates())); _painterPath.moveTo(_map->ll2xy(_path.first().coordinates()));
for (int i = 1; i < _path.size(); i++) { for (int i = 1; i < _path.size(); i++) {
const PathPoint &p1 = _path.at(i-1); const PathPoint &p1 = _path.at(i-1);
const PathPoint &p2 = _path.at(i); const PathPoint &p2 = _path.at(i);
unsigned n = segments(p2.distance() - p1.distance()); unsigned n = segments(p2.distance() - p1.distance());
if (n > 1) { if (n > 1) {
Coordinates c1(p1.coordinates()); GreatCircle gc(p1.coordinates(), p2.coordinates());
Coordinates c2(p2.coordinates()); Coordinates last = p1.coordinates();
GreatCircle gc(c1, c2);
double prev = c1.lon();
for (unsigned j = 1; j <= n; j++) { for (unsigned j = 1; j <= n; j++) {
Coordinates c(gc.pointAt(j/(double)n)); Coordinates c(gc.pointAt(j/(double)n));
double current = c.lon(); addSegment(last, c);
if (fabs(current - prev) > 180.0) last = c;
_painterPath.moveTo(map->ll2xy(c));
else
_painterPath.lineTo(map->ll2xy(c));
prev = current;
} }
} else } else
_painterPath.lineTo(map->ll2xy(p2.coordinates())); addSegment(p1.coordinates(), p2.coordinates());
} }
} }
@ -99,7 +101,7 @@ void PathItem::setMap(Map *map)
_map = map; _map = map;
updatePainterPath(map); updatePainterPath();
updateShape(); updateShape();
_marker->setPos(position(_markerDistance)); _marker->setPos(position(_markerDistance));

4
src/GUI/pathitem.h
View File

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