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https://github.com/tumic0/GPXSee.git
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87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#include <cmath>
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#include "common/rectc.h"
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#include "projection.h"
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#include "rectd.h"
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static void growRect(const Projection &proj, const Coordinates &c, RectD &rect)
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{
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PointD p(proj.ll2xy(c));
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if (p.x() < rect.left())
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rect.setLeft(p.x());
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if (p.x() > rect.right())
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rect.setRight(p.x());
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if (p.y() > rect.top())
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rect.setTop(p.y());
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if (p.y() < rect.bottom())
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rect.setBottom(p.y());
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}
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static void growRect(const Projection &proj, const PointD &p, RectC &rect)
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{
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Coordinates c(proj.xy2ll(p));
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if (c.lon() < rect.left())
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rect.setLeft(c.lon());
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if (c.lon() > rect.right())
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rect.setRight(c.lon());
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if (c.lat() > rect.top())
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rect.setTop(c.lat());
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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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RectD::RectD(const RectC &rect, const Projection &proj, int samples)
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{
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if (!rect.isValid())
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return;
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double dx = rect.width() / samples;
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double dy = rect.height() / samples;
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PointD tl(proj.ll2xy(rect.topLeft()));
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PointD br(proj.ll2xy(rect.bottomRight()));
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RectD prect(tl, br);
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for (int i = 0; i <= samples; i++) {
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double x = remainder(rect.left() + i * dx, 360.0);
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growRect(proj, Coordinates(x, rect.bottom()), prect);
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growRect(proj, Coordinates(x, rect.top()), prect);
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}
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for (int i = 0; i <= samples; i++) {
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double y = rect.bottom() + i * dy;
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growRect(proj, Coordinates(rect.left(), y), prect);
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growRect(proj, Coordinates(rect.right(), y), prect);
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}
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*this = prect;
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}
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RectC RectD::toRectC(const Projection &proj, int samples) const
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{
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if (!isValid())
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return RectC();
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double dx = width() / samples;
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double dy = height() / samples;
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Coordinates c(proj.xy2ll(center()));
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RectC rect(c, c);
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for (int i = 0; i <= samples; i++) {
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double x = left() + i * dx;
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growRect(proj, PointD(x, bottom()), rect);
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growRect(proj, PointD(x, top()), rect);
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}
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for (int i = 0; i <= samples; i++) {
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double y = bottom() + i * dy;
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growRect(proj, PointD(left(), y), rect);
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growRect(proj, PointD(right(), y), rect);
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}
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return rect;
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}
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