void
TrackLineRenderer::DrawProjected(Canvas &canvas,
const WindowProjection &projection,
const NMEAInfo &basic,
const DerivedInfo &calculated,
const MapSettings &settings,
bool wind_relative)
{
// projection.GetMapScale() <= 6000;
GeoPoint traildrift;
if (calculated.wind_available && !wind_relative) {
GeoPoint tp1 = FindLatitudeLongitude(basic.location,
calculated.wind.bearing,
calculated.wind.norm);
traildrift = basic.location - tp1;
} else {
traildrift = GeoPoint(Angle::Zero(), Angle::Zero());
}
auto dt = ARC_SWEEP/ARC_STEPS/
std::max(MIN_RATE,calculated.turn_rate_heading_smoothed.Absolute());
Angle heading = basic.attitude.heading;
GeoPoint loc = basic.location;
RasterPoint pts[ARC_STEPS+1];
pts[0] = projection.GeoToScreen(loc);
int i = 1;
while (i <= ARC_STEPS) {
GeoVector v(basic.true_airspeed*dt, heading);
loc = v.EndPoint(loc.Parametric(traildrift, dt));
pts[i] = projection.GeoToScreen(loc);
heading += calculated.turn_rate_heading_smoothed*dt;
i++;
}
canvas.Select(look.track_line_pen);
canvas.DrawPolyline(pts, i);
}
