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156 lines
3.6 KiB
C++
156 lines
3.6 KiB
C++
#include <QPainter>
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#include "common/coordinates.h"
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#include "common/rectc.h"
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#include "common/wgs84.h"
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#include "downloader.h"
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#include "config.h"
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#include "onlinemap.h"
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#define TILE_SIZE 256
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#define EPSILON 1e-6
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static QPointF ll2m(const Coordinates &c)
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{
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return QPointF(c.lon(), rad2deg(log(tan(M_PI_4 + deg2rad(c.lat())/2.0))));
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}
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static Coordinates m2ll(const QPointF &p)
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{
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return Coordinates(p.x(), rad2deg(2.0 * atan(exp(deg2rad(p.y()))) - M_PI_2));
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}
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static QPoint mercator2tile(const QPointF &m, int z)
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{
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QPoint tile;
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tile.setX((int)(floor((m.x() + 180.0) / 360.0 * (1<<z))));
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tile.setY((int)(floor((1.0 - (m.y() / 180.0)) / 2.0 * (1<<z))));
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return tile;
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}
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static qreal zoom2scale(int zoom)
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{
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return (360.0/(qreal)((1<<zoom) * TILE_SIZE));
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}
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static int scale2zoom(qreal scale)
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{
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return (int)(log2(360.0/(scale * (qreal)TILE_SIZE)) + EPSILON);
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}
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OnlineMap::OnlineMap(const QString &name, const QString &url,
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const Range &zooms, const RectC &bounds, const Authorization &authorization,
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QObject *parent) : Map(parent), _name(name), _zooms(zooms), _bounds(bounds),
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_valid(false)
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{
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QString dir(TILES_DIR + "/" + _name);
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_zoom = _zooms.max();
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_tileLoader = new TileLoader(this);
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_tileLoader->setUrl(url);
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_tileLoader->setDir(dir);
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_tileLoader->setAuthorization(authorization);
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connect(_tileLoader, SIGNAL(finished()), this, SIGNAL(loaded()));
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if (!QDir().mkpath(dir)) {
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_errorString = "Error creating tiles dir";
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return;
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}
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_valid = true;
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}
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QRectF OnlineMap::bounds()
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{
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return QRectF(ll2xy(_bounds.topLeft()), ll2xy(_bounds.bottomRight()));
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}
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int OnlineMap::limitZoom(int zoom) const
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{
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if (zoom < _zooms.min())
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return _zooms.min();
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if (zoom > _zooms.max())
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return _zooms.max();
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return zoom;
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}
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int OnlineMap::zoomFit(const QSize &size, const RectC &rect)
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{
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if (!rect.isValid())
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_zoom = _zooms.max();
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else {
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QRectF tbr(ll2m(rect.topLeft()), ll2m(rect.bottomRight()));
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QPointF sc(tbr.width() / size.width(), tbr.height() / size.height());
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_zoom = limitZoom(scale2zoom(qMax(sc.x(), -sc.y())));
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}
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return _zoom;
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}
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qreal OnlineMap::resolution(const QRectF &rect)
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{
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qreal scale = zoom2scale(_zoom);
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return (WGS84_RADIUS * 2.0 * M_PI * scale / 360.0
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* cos(2.0 * atan(exp(deg2rad(-rect.center().y() * scale))) - M_PI/2));
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}
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int OnlineMap::zoomIn()
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{
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_zoom = qMin(_zoom + 1, _zooms.max());
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return _zoom;
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}
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int OnlineMap::zoomOut()
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{
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_zoom = qMax(_zoom - 1, _zooms.min());
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return _zoom;
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}
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void OnlineMap::draw(QPainter *painter, const QRectF &rect, bool block)
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{
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qreal scale = zoom2scale(_zoom);
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QPoint tile = mercator2tile(QPointF(rect.topLeft().x() * scale,
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-rect.topLeft().y() * scale), _zoom);
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QPoint tl = QPoint((int)floor(rect.left() / (qreal)TILE_SIZE)
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* TILE_SIZE, (int)floor(rect.top() / TILE_SIZE) * TILE_SIZE);
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QList<Tile> tiles;
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QSizeF s(rect.right() - tl.x(), rect.bottom() - tl.y());
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for (int i = 0; i < ceil(s.width() / TILE_SIZE); i++)
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for (int j = 0; j < ceil(s.height() / TILE_SIZE); j++)
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tiles.append(Tile(QPoint(tile.x() + i, tile.y() + j), _zoom));
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if (block)
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_tileLoader->loadTilesSync(tiles);
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else
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_tileLoader->loadTilesAsync(tiles);
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for (int i = 0; i < tiles.count(); i++) {
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Tile &t = tiles[i];
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QPoint tp(tl.x() + (t.xy().x() - tile.x()) * TILE_SIZE,
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tl.y() + (t.xy().y() - tile.y()) * TILE_SIZE);
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if (!t.pixmap().isNull())
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painter->drawPixmap(tp, t.pixmap());
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}
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}
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QPointF OnlineMap::ll2xy(const Coordinates &c)
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{
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qreal scale = zoom2scale(_zoom);
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QPointF m = ll2m(c);
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return QPointF(m.x() / scale, m.y() / -scale);
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}
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Coordinates OnlineMap::xy2ll(const QPointF &p)
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{
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qreal scale = zoom2scale(_zoom);
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return m2ll(QPointF(p.x() * scale, -p.y() * scale));
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}
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