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Zooming & scrolling improvements

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This commit is contained in:
Martin Tůma 2015-11-25 23:17:39 +01:00
parent 0c002bc1e9
commit f54ca1529a
3 changed files with 30 additions and 6 deletions
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10
src/ll.cpp
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@ -58,5 +58,13 @@ QPointF tile2mercator(const QPoint &tile, int z)
int scale2zoom(qreal scale)
{
return (int)log2(360.0/(scale * (qreal)TILE_SIZE));
int zoom;
zoom = (int)log2(360.0/(scale * (qreal)TILE_SIZE));
if (zoom < ZOOM_MIN)
return ZOOM_MIN;
if (zoom > ZOOM_MAX)
return ZOOM_MAX;
return zoom;
}

2
src/ll.h
View File

@ -4,6 +4,8 @@
#include <QPointF>
#define TILE_SIZE 256
#define ZOOM_MAX 18
#define ZOOM_MIN 3
QPointF ll2mercator(const QPointF &ll);
qreal llDistance(const QPointF &p1, const QPointF &p2);

24
src/track.cpp
View File

@ -14,8 +14,6 @@
#define MARGIN 10.0
#define TRACK_WIDTH 3
#define ZOOM_MAX 19
#define ZOOM_MIN 0
Track::Track(QWidget *parent)
@ -23,8 +21,10 @@ Track::Track(QWidget *parent)
{
_scene = new QGraphicsScene(this);
setScene(_scene);
setResizeAnchor(QGraphicsView::AnchorViewCenter);
setCacheMode(QGraphicsView::CacheBackground);
setDragMode(QGraphicsView::ScrollHandDrag);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
_zoom = -1;
_scale = 1.0;
@ -120,10 +120,20 @@ void Track::rescale(qreal scale)
_trackPaths.at(i)->setPen(pen);
}
QHash<Entry, POIItem*>::const_iterator it;
for (it = _pois.constBegin(); it != _pois.constEnd(); it++)
QHash<Entry, POIItem*>::const_iterator it, jt;
for (it = _pois.constBegin(); it != _pois.constEnd(); it++) {
it.value()->setPos(QPointF(it.value()->entry().coordinates.x()
* 1.0/scale, -it.value()->entry().coordinates.y() * 1.0/scale));
it.value()->show();
}
for (it = _pois.constBegin(); it != _pois.constEnd(); it++) {
for (jt = _pois.constBegin(); jt != _pois.constEnd(); jt++) {
if (it != jt && it.value()->isVisible() && jt.value()->isVisible()
&& it.value()->collidesWithItem(jt.value()))
jt.value()->hide();
}
}
_scale = scale;
}
@ -175,11 +185,15 @@ void Track::redraw()
void Track::wheelEvent(QWheelEvent *event)
{
QPointF pos = mapToScene(event->pos());
qreal scale = _scale;
_zoom = (event->delta() > 0) ?
qMin(_zoom + 1, ZOOM_MAX) : qMax(_zoom - 1, ZOOM_MIN);
rescale(mapScale());
_scene->setSceneRect(_scene->itemsBoundingRect());
centerOn(pos * scale/_scale);
resetCachedContent();
}