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76 lines
1.4 KiB
C++
76 lines
1.4 KiB
C++
#include <cmath>
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#include <QLineF>
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#include "map.h"
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#define SAMPLES 100
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void Map::growLeft(const QPointF &p, RectC &rect)
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{
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Coordinates c(xy2ll(p));
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if (c.lon() < rect.left())
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rect.setLeft(c.lon());
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}
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void Map::growRight(const QPointF &p, RectC &rect)
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{
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Coordinates c(xy2ll(p));
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if (c.lon() > rect.right())
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rect.setRight(c.lon());
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}
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void Map::growTop(const QPointF &p, RectC &rect)
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{
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Coordinates c(xy2ll(p));
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if (c.lat() > rect.top())
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rect.setTop(c.lat());
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}
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void Map::growBottom(const QPointF &p, RectC &rect)
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{
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Coordinates c(xy2ll(p));
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if (c.lat() < rect.bottom())
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rect.setBottom(c.lat());
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}
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RectC Map::llBounds()
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{
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QRectF b(bounds());
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double dx = b.width() / SAMPLES;
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double dy = b.height() / SAMPLES;
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Coordinates tl(xy2ll(b.topLeft()));
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Coordinates br(xy2ll(b.bottomRight()));
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RectC rect(tl, br);
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for (int i = 0; i <= SAMPLES; i++) {
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double x = b.left() + i * dx;
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growBottom(QPointF(x, b.bottom()), rect);
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growTop(QPointF(x, b.top()), rect);
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}
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for (int i = 0; i <= SAMPLES; i++) {
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double y = b.top() + i * dy;
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growLeft(QPointF(b.left(), y), rect);
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growRight(QPointF(b.right(), y), rect);
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}
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return rect;
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}
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qreal Map::resolution(const QRectF &rect)
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{
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qreal cy = rect.center().y();
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QPointF cl(rect.left(), cy);
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QPointF cr(rect.right(), cy);
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qreal ds = xy2ll(cl).distanceTo(xy2ll(cr));
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qreal ps = QLineF(cl, cr).length();
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return ds/ps;
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}
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