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78 lines
1.5 KiB
C++
78 lines
1.5 KiB
C++
#include <QtGlobal>
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#include <QPainter>
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#include "misc.h"
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#include "rd.h"
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#include "wgs84.h"
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#include "coordinates.h"
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#include "mercator.h"
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#include "emptymap.h"
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#define SCALE_MIN 0.5
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#define SCALE_MAX 1.0E-6
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EmptyMap::EmptyMap(QObject *parent) : Map(parent)
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{
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_scale = SCALE_MAX;
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}
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QRectF EmptyMap::bounds() const
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{
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return scaled(QRectF(QPointF(-180, -180), QSizeF(360, 360)), 1.0/_scale);
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}
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qreal EmptyMap::zoomFit(const QSize &size, const QRectF &br)
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{
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if (br.isNull())
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_scale = SCALE_MAX;
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else {
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Coordinates topLeft(br.topLeft());
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Coordinates bottomRight(br.bottomRight());
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QRectF tbr(Mercator().ll2xy(topLeft), Mercator().ll2xy(bottomRight));
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QPointF sc(tbr.width() / size.width(), tbr.height() / size.height());
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_scale = qMax(sc.x(), sc.y());
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}
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_scale = qMax(_scale, SCALE_MAX);
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_scale = qMin(_scale, SCALE_MIN);
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return _scale;
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}
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qreal EmptyMap::resolution(const QPointF &p) const
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{
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return (WGS84_RADIUS * 2 * M_PI * _scale / 360.0
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* cos(2.0 * atan(exp(deg2rad(-p.y() * _scale))) - M_PI/2));
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}
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qreal EmptyMap::zoomIn()
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{
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_scale = qMax(_scale / 2.0, SCALE_MAX);
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return _scale;
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}
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qreal EmptyMap::zoomOut()
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{
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_scale = qMin(_scale * 2.0, SCALE_MIN);
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return _scale;
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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, Qt::white);
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}
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QPointF EmptyMap::ll2xy(const Coordinates &c) const
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{
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QPointF m = Mercator().ll2xy(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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QPointF m(p.x() * _scale, -p.y() * _scale);
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return Mercator().xy2ll(m);
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}
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