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Draw radar range circle using geodesic projection

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This commit is contained in:
Dan Paulat 2021-07-17 15:54:13 -05:00
parent 9b6582cd95
commit c3037d6d38
4 changed files with 29 additions and 15 deletions
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32
scwx-qt/source/scwx/qt/map/radar_range_layer.cpp
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@ -1,8 +1,9 @@
#include <scwx/qt/map/radar_range_layer.hpp>
#include <boost/log/trivial.hpp>
#include <geodesic.h>
#include <glm/glm.hpp>
#include <mbgl/util/constants.hpp>
namespace scwx
{
@ -11,18 +12,21 @@ namespace qt
static const std::string logPrefix_ = "[scwx::qt::map::radar_range_layer] ";
static constexpr double EARTH_FLATTENING = 1 / 298.257223563;
void RadarRangeLayer::Add(std::shared_ptr<QMapboxGL> map, const QString& before)
{
BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "Add()";
geod_geodesic g;
geod_init(&g, mbgl::util::EARTH_RADIUS_M, EARTH_FLATTENING);
constexpr float range = 460.0f * 1000.0f;
constexpr float angleDelta = glm::radians<float>(0.5f);
constexpr float angleDelta = 0.5f;
constexpr float angleDeltaH = angleDelta / 2.0f;
const QMapbox::Coordinate radar {38.6986, -90.6828};
const QMapbox::ProjectedMeters radarMeters {
QMapbox::projectedMetersForCoordinate(radar)};
const QMapbox::Coordinate radar {38.6986, -90.6828};
float angle = -angleDeltaH;
@ -30,15 +34,19 @@ void RadarRangeLayer::Add(std::shared_ptr<QMapboxGL> map, const QString& before)
for (uint16_t azimuth = 0; azimuth <= 720; ++azimuth)
{
const float sinTheta = std::sinf(angle);
const float cosTheta = std::cosf(angle);
double latitude;
double longitude;
const float x = range * sinTheta + radarMeters.second;
const float y = range * cosTheta + radarMeters.first;
geod_direct(&g,
radar.first,
radar.second,
angle,
range,
&latitude,
&longitude,
nullptr);
QMapbox::Coordinate point {QMapbox::coordinateForProjectedMeters({y, x})};
geometry.append(point);
geometry.append({latitude, longitude});
angle += angleDelta;
}