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Determine if a geographic area contains a point

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This commit is contained in:
Dan Paulat 2023-12-02 07:42:29 -06:00
parent 6ec594144d
commit 8780da4148
5 changed files with 85 additions and 1 deletions
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62
scwx-qt/source/scwx/qt/util/geographic_lib.cpp
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@ -1,4 +1,9 @@
#include <scwx/qt/util/geographic_lib.hpp>
#include <scwx/util/logger.hpp>
#include <GeographicLib/Gnomonic.hpp>
#include <geos/algorithm/PointLocation.h>
#include <geos/geom/CoordinateSequence.h>
namespace scwx
{
@ -9,6 +14,9 @@ namespace util
namespace GeographicLib
{
static const std::string logPrefix_ = "scwx::qt::util::geographic_lib";
static const auto logger_ = scwx::util::Logger::Create(logPrefix_);
const ::GeographicLib::Geodesic& DefaultGeodesic()
{
static const ::GeographicLib::Geodesic geodesic_ {
@ -18,6 +26,60 @@ const ::GeographicLib::Geodesic& DefaultGeodesic()
return geodesic_;
}
bool AreaContainsPoint(const std::vector<common::Coordinate>& area,
const common::Coordinate& point)
{
// Cannot have an area with just two points
if (area.size() <= 2 || area.size() == 3 && area.front() == area.back())
{
return false;
}
::GeographicLib::Gnomonic gnomonic {};
geos::geom::CoordinateSequence sequence {};
double x;
double y;
bool areaContainsPoint = false;
// Using a gnomonic projection with the test point as the center
// latitude/longitude, the projected test point will be at (0, 0)
geos::geom::CoordinateXY zero {};
// Create the area coordinate sequence using a gnomonic projection
for (auto& areaCoordinate : area)
{
gnomonic.Forward(point.latitude_,
point.longitude_,
areaCoordinate.latitude_,
areaCoordinate.longitude_,
x,
y);
sequence.add(x, y);
}
// If the sequence is not a ring, add the first point again for closure
if (!sequence.isRing())
{
sequence.add(sequence.front(), false);
}
// The sequence should be a ring at this point, but make sure
if (sequence.isRing())
{
try
{
areaContainsPoint =
geos::algorithm::PointLocation::isInRing(zero, &sequence);
}
catch (const std::exception&)
{
logger_->trace("Invalid area sequence");
}
}
return areaContainsPoint;
}
units::angle::degrees<double>
GetAngle(double lat1, double lon1, double lat2, double lon2)
{