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Fixed the 1px content offset issue on zoom/map change

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This commit is contained in:
Martin Tůma 2017-09-17 14:10:37 +02:00
parent 2cd35b139e
commit 7bc83603ca
2 changed files with 29 additions and 35 deletions
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62
src/pathview.cpp
View File

@ -3,6 +3,7 @@
#include <QWheelEvent>
#include <QApplication>
#include <QPixmapCache>
#include <QScrollBar>
#include "opengl.h"
#include "misc.h"
#include "poi.h"
@ -39,6 +40,7 @@ PathView::PathView(Map *map, POI *poi, QWidget *parent)
_mapScale = new ScaleItem();
_mapScale->setZValue(2.0);
_scene->addItem(_mapScale);
_map = map;
_poi = poi;
@ -72,13 +74,26 @@ PathView::PathView(Map *map, POI *poi, QWidget *parent)
_map->setBackgroundColor(_backgroundColor);
_scene->setSceneRect(_map->bounds());
_res = _map->resolution(_scene->sceneRect().center());
centerOn(_scene->sceneRect().center());
}
PathView::~PathView()
void PathView::centerOn(const QPointF &pos)
{
if (_mapScale->scene() != _scene)
delete _mapScale;
QGraphicsView::centerOn(pos);
/* Fix the offset caused by QGraphicsView::centerOn() approximation */
QPointF center = mapToScene(viewport()->rect().center());
QPoint offset((int)(pos.x() - center.x()), (int)(pos.y() - center.y()));
if (qAbs(offset.x()) == 1)
horizontalScrollBar()->setValue(horizontalScrollBar()->value()
+ offset.x());
if (qAbs(offset.y()) == 1)
verticalScrollBar()->setValue(verticalScrollBar()->value()
+ offset.y());
_res = _map->resolution(pos);
_mapScale->setResolution(_res);
}
PathItem *PathView::addTrack(const Track &track)
@ -169,13 +184,7 @@ QList<PathItem *> PathView::loadData(const Data &data)
else
updatePOIVisibility();
QPointF center = contentCenter();
centerOn(center);
_res = _map->resolution(center);
_mapScale->setResolution(_res);
if (_mapScale->scene() != _scene)
_scene->addItem(_mapScale);
centerOn(contentCenter());
return paths;
}
@ -283,11 +292,7 @@ void PathView::setMap(Map *map)
it.value()->setMap(_map);
updatePOIVisibility();
pos = _map->ll2xy(center);
centerOn(pos);
_res = _map->resolution(pos);
_mapScale->setResolution(_res);
centerOn(_map->ll2xy(center));
resetCachedContent();
QPixmapCache::clear();
@ -421,15 +426,8 @@ void PathView::zoom(int zoom, const QPoint &pos, const Coordinates &c)
ns = (zoom > 0) ? _map->zoomIn() : _map->zoomOut();
if (ns != os) {
QPoint offset = pos - viewport()->rect().center();
rescale();
QPointF center = _map->ll2xy(c) - offset;
centerOn(center);
_res = _map->resolution(center);
_mapScale->setResolution(_res);
centerOn(_map->ll2xy(c) - (pos - viewport()->rect().center()));
} else {
if (shift)
digitalZoom(zoom);
@ -523,11 +521,11 @@ void PathView::plot(QPainter *painter, const QRectF &target, qreal scale,
adj = QRect(0, 0, adj.width() * s.x(), adj.height() * s.y());
_map->zoomFit(adj.size(), _tr | _rr | _wr);
rescale();
QPointF center = contentCenter();
centerOn(center);
adj.moveCenter(mapFromScene(center));
_mapScale->setResolution(_map->resolution(_map->ll2xy(origLL)));
_mapScale->setDigitalZoom(-log2(s.x() / q));
_mapScale->setPos(mapToScene(QPoint(adj.bottomRight() + QPoint(
-(SCALE_OFFSET + _mapScale->boundingRect().width()) * (s.x() / q),
@ -547,7 +545,6 @@ void PathView::plot(QPainter *painter, const QRectF &target, qreal scale,
_map->zoomFit(origRes, origLL);
rescale();
centerOn(origScene);
_mapScale->setResolution(origRes);
}
_mapScale->setDigitalZoom(0);
_mapScale->setPos(origPos);
@ -560,14 +557,15 @@ void PathView::plot(QPainter *painter, const QRectF &target, qreal scale,
void PathView::clear()
{
if (_mapScale->scene() == _scene)
_scene->removeItem(_mapScale);
_pois.clear();
_tracks.clear();
_routes.clear();
_waypoints.clear();
_scene->removeItem(_mapScale);
_scene->clear();
_scene->addItem(_mapScale);
_palette.reset();
_tr = RectC();
@ -756,11 +754,7 @@ void PathView::resizeEvent(QResizeEvent *event)
if (mapZoom() != zoom)
rescale();
QPointF center = contentCenter();
centerOn(center);
_res = _map->resolution(center);
_mapScale->setResolution(_res);
centerOn(contentCenter());
QGraphicsView::resizeEvent(event);
}

2
src/pathview.h
View File

@ -28,7 +28,6 @@ class PathView : public QGraphicsView
public:
PathView(Map *map, POI *poi, QWidget *parent = 0);
~PathView();
QList<PathItem*> loadData(const Data &data);
@ -85,6 +84,7 @@ private:
qreal mapZoom() const;
QPointF contentCenter() const;
void rescale();
void centerOn(const QPointF &pos);
void zoom(int zoom, const QPoint &pos, const Coordinates &c);
void digitalZoom(int zoom);
void resetDigitalZoom();