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Tile loading code cleanup

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This commit is contained in:
Martin Tůma 2017-03-20 09:25:05 +01:00
parent b21c2267cf
commit 2bf66ea912
2 changed files with 14 additions and 26 deletions
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38
src/onlinemap.cpp
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@ -12,6 +12,7 @@
#define ZOOM_MAX 18
#define ZOOM_MIN 3
#define TILE_SIZE 256
static QPoint mercator2tile(const QPointF &m, int z)
{
@ -23,19 +24,9 @@ static QPoint mercator2tile(const QPointF &m, int z)
return tile;
}
static QPointF tile2mercator(const QPoint &tile, int z)
{
QPointF m;
m.setX(((360.0 * tile.x()) / (qreal)(1<<z)) - 180.0);
m.setY((1.0 - (2.0 * tile.y()) / (qreal)(1<<z)) * 180.0);
return m;
}
static int scale2zoom(qreal scale)
{
int zoom = (int)log2(360.0/(scale * (qreal)Tile::size()));
int zoom = (int)log2(360.0/(scale * (qreal)TILE_SIZE));
if (zoom < ZOOM_MIN)
return ZOOM_MIN;
@ -55,7 +46,7 @@ OnlineMap::OnlineMap(const QString &name, const QString &url, QObject *parent)
_url = url;
downloader = downloader;
_block = false;
_scale = ((360.0/(qreal)(1<<ZOOM_MAX))/(qreal)Tile::size());
_scale = ((360.0/(qreal)(1<<ZOOM_MAX))/(qreal)TILE_SIZE);
connect(downloader, SIGNAL(finished()), this, SLOT(emitLoaded()));
@ -127,7 +118,7 @@ void OnlineMap::loadTilesSync(QList<Tile> &list)
void OnlineMap::fillTile(Tile &tile)
{
tile.pixmap() = QPixmap(Tile::size(), Tile::size());
tile.pixmap() = QPixmap(TILE_SIZE, TILE_SIZE);
tile.pixmap().fill();
}
@ -178,7 +169,7 @@ QRectF OnlineMap::bounds() const
qreal OnlineMap::zoomFit(const QSize &size, const QRectF &br)
{
if (br.isNull())
_scale = ((360.0/(qreal)(1<<ZOOM_MAX))/(qreal)Tile::size());
_scale = ((360.0/(qreal)(1<<ZOOM_MAX))/(qreal)TILE_SIZE);
else {
Coordinates topLeft(br.topLeft());
Coordinates bottomRight(br.bottomRight());
@ -187,7 +178,7 @@ qreal OnlineMap::zoomFit(const QSize &size, const QRectF &br)
QPointF sc(tbr.width() / size.width(), tbr.height() / size.height());
_scale = ((360.0/(qreal)(1<<scale2zoom(qMax(sc.x(), sc.y()))))
/ (qreal)Tile::size());
/ (qreal)TILE_SIZE);
}
return _scale;
@ -202,14 +193,14 @@ qreal OnlineMap::resolution(const QPointF &p) const
qreal OnlineMap::zoomIn()
{
int zoom = qMin(scale2zoom(_scale) + 1, ZOOM_MAX);
_scale = ((360.0/(qreal)(1<<zoom))/(qreal)Tile::size());
_scale = ((360.0/(qreal)(1<<zoom))/(qreal)TILE_SIZE);
return _scale;
}
qreal OnlineMap::zoomOut()
{
int zoom = qMax(scale2zoom(_scale) - 1, ZOOM_MIN);
_scale = ((360.0/(qreal)(1<<zoom))/(qreal)Tile::size());
_scale = ((360.0/(qreal)(1<<zoom))/(qreal)TILE_SIZE);
return _scale;
}
@ -219,14 +210,13 @@ void OnlineMap::draw(QPainter *painter, const QRectF &rect)
QPoint tile = mercator2tile(QPointF(rect.topLeft().x() * _scale,
-rect.topLeft().y() * _scale), zoom);
QPointF tm = tile2mercator(tile, zoom);
QPoint tl = QPoint((int)(tm.x() / _scale), (int)(-tm.y() / _scale));
QPoint tl = QPoint((int)floor(rect.left() / (qreal)TILE_SIZE)
* TILE_SIZE, (int)floor(rect.top() / TILE_SIZE) * TILE_SIZE);
QList<Tile> tiles;
QSizeF s(rect.right() - tl.x(), rect.bottom() - tl.y());
for (int i = 0; i < ceil(s.width() / Tile::size()); i++)
for (int j = 0; j < ceil(s.height() / Tile::size()); j++)
for (int i = 0; i < ceil(s.width() / TILE_SIZE); i++)
for (int j = 0; j < ceil(s.height() / TILE_SIZE); j++)
tiles.append(Tile(QPoint(tile.x() + i, tile.y() + j), zoom));
if (_block)
@ -236,8 +226,8 @@ void OnlineMap::draw(QPainter *painter, const QRectF &rect)
for (int i = 0; i < tiles.count(); i++) {
Tile &t = tiles[i];
QPoint tp(tl.x() + (t.xy().x() - tile.x()) * Tile::size(),
tl.y() + (t.xy().y() - tile.y()) * Tile::size());
QPoint tp(tl.x() + (t.xy().x() - tile.x()) * TILE_SIZE,
tl.y() + (t.xy().y() - tile.y()) * TILE_SIZE);
painter->drawPixmap(tp, t.pixmap());
}
}

2
src/tile.h
View File

@ -14,8 +14,6 @@ public:
const QPoint& xy() const {return _xy;}
QPixmap& pixmap() {return _pixmap;}
static int size() {return 256;}
private:
int _zoom;
QPoint _xy;