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105 lines
2.0 KiB
C++
105 lines
2.0 KiB
C++
#include <QtGlobal>
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#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 "emptymap.h"
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#define ZOOM_MIN 0
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#define ZOOM_MAX 19
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#define TILE_SIZE 256
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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/4.0 + 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 * atan(exp(deg2rad(p.y()))) - M_PI/2));
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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));
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}
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static int limitZoom(int zoom)
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{
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if (zoom < ZOOM_MIN)
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return ZOOM_MIN;
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if (zoom > ZOOM_MAX)
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return ZOOM_MAX;
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return zoom;
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}
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EmptyMap::EmptyMap(QObject *parent) : Map(parent)
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{
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_zoom = ZOOM_MAX;
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}
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QRectF EmptyMap::bounds() const
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{
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return QRectF(ll2xy(Coordinates(-180, 85)), ll2xy(Coordinates(180, -85)));
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}
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int EmptyMap::zoomFit(const QSize &size, const RectC &br)
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{
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if (!br.isValid())
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_zoom = ZOOM_MAX;
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else {
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QRectF tbr(ll2m(br.topLeft()), ll2m(br.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 EmptyMap::resolution(const QRectF &rect) const
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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 EmptyMap::zoomIn()
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{
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_zoom = qMin(_zoom + 1, ZOOM_MAX);
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return _zoom;
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}
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int EmptyMap::zoomOut()
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{
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_zoom = qMax(_zoom - 1, ZOOM_MIN);
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return _zoom;
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}
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void EmptyMap::draw(QPainter *painter, const QRectF &rect)
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{
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painter->fillRect(rect, _backgroundColor);
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}
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QPointF EmptyMap::ll2xy(const Coordinates &c) const
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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 EmptyMap::xy2ll(const QPointF &p) const
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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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