void
RenderMacCready(Canvas &canvas, const PixelRect rc,
const ChartLook &chart_look,
const GlidePolar &glide_polar)
{
ChartRenderer chart(chart_look, canvas, rc);
if (!glide_polar.IsValid()) {
chart.DrawNoData();
return;
}
chart.ScaleXFromValue(0);
chart.ScaleXFromValue(MAX_MACCREADY);
chart.ScaleYFromValue(0);
chart.ScaleYFromValue(glide_polar.GetVMax());
chart.DrawXGrid(Units::ToSysVSpeed(1), 1, ChartRenderer::UnitFormat::NUMERIC);
chart.DrawYGrid(Units::ToSysSpeed(10), 10, ChartRenderer::UnitFormat::NUMERIC);
GlidePolar gp = glide_polar;
double m = 0;
double m_last;
gp.SetMC(m);
double v_last = gp.GetVBestLD();
double vav_last = 0;
do {
m_last = m;
m+= MAX_MACCREADY/STEPS_MACCREADY;
gp.SetMC(m);
const double v = gp.GetVBestLD();
const double vav = gp.GetAverageSpeed();
chart.DrawLine(m_last, v_last, m, v, ChartLook::STYLE_BLACK);
chart.DrawLine(m_last, vav_last, m, vav, ChartLook::STYLE_BLUETHINDASH);
v_last = v;
vav_last = vav;
} while (m<MAX_MACCREADY);
// draw current MC setting
chart.DrawLine(glide_polar.GetMC(), 0, glide_polar.GetMC(), glide_polar.GetVMax(),
ChartLook::STYLE_REDTHICKDASH);
// draw labels and other overlays
gp.SetMC(0.9*MAX_MACCREADY);
chart.DrawLabel(_T("Vopt"), 0.9*MAX_MACCREADY, gp.GetVBestLD());
gp.SetMC(0.9*MAX_MACCREADY);
chart.DrawLabel(_T("Vave"), 0.9*MAX_MACCREADY, gp.GetAverageSpeed());
chart.DrawYLabel(_T("V"), Units::GetSpeedName());
chart.DrawXLabel(_T("MC"), Units::GetVerticalSpeedName());
RenderGlidePolarInfo(canvas, rc, chart_look, glide_polar);
}
void
GlidePolarTest::TestBasic()
{
polar.Update();
ok1(equals(polar.polar.a, polar.ideal_polar.a));
ok1(equals(polar.polar.b, polar.ideal_polar.b));
ok1(equals(polar.polar.c, polar.ideal_polar.c));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)), 0.606));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)), 0.99));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)), 1.918));
ok1(equals(polar.GetSMax(), polar.SinkRate(polar.GetVMax())));
ok1(equals(polar.GetVMin(), 19.934640523));
ok1(equals(polar.GetSMin(), polar.SinkRate(polar.GetVMin())));
ok1(equals(polar.GetVTakeoff(), polar.GetVMin() / 2));
ok1(equals(polar.GetVBestLD(), 25.830434162));
ok1(equals(polar.GetSBestLD(), polar.SinkRate(polar.GetVBestLD())));
ok1(equals(polar.GetBestLD(), polar.GetVBestLD() / polar.GetSBestLD()));
ok1(equals(polar.GetTotalMass(), 318));
ok1(equals(polar.GetWingLoading(), 32.448979592));
ok1(equals(polar.GetBallast(), 0));
ok1(equals(polar.GetBallastLitres(), 0));
ok1(polar.IsBallastable());
ok1(!polar.HasBallast());
}
bool
AirspaceWarningManager::UpdateTask(const AircraftState &state,
const GlidePolar &glide_polar,
const TaskStats &task_stats)
{
if (!glide_polar.IsValid())
return false;
const ElementStat ¤t_leg = task_stats.current_leg;
if (!task_stats.task_valid || !current_leg.location_remaining.IsValid())
return false;
const GlideResult &solution = current_leg.solution_remaining;
if (!solution.IsOk() || !solution.IsAchievable())
/* glide solver failed, cannot continue */
return false;
const AirspaceAircraftPerformance perf_task(glide_polar,
current_leg.solution_remaining);
GeoPoint location_tp = current_leg.location_remaining;
const fixed time_remaining = solution.time_elapsed;
const GeoVector vector(state.location, location_tp);
fixed max_distance = config.warning_time * glide_polar.GetVMax();
if (vector.distance > max_distance)
/* limit the distance to what our glider can actually fly within
the configured warning time */
location_tp = state.location.IntermediatePoint(location_tp, max_distance);
return UpdatePredicted(state, location_tp, perf_task,
AirspaceWarning::WARNING_TASK, time_remaining);
}
/**
* Specialisation based on simplified theoretical MC cross-country
* speeds. Assumes cruise at best LD (ignoring wind) for current MC
* setting, climb rate at MC setting, with direct descent possible
* at sink rate of cruise.
*/
explicit AirspaceAircraftPerformance(const GlidePolar &polar)
:vertical_tolerance(0),
cruise_speed(polar.GetVBestLD()), cruise_descent(polar.GetSBestLD()),
descent_rate(polar.GetSMax()),
climb_rate(polar.GetMC()),
max_speed(polar.GetVMax()) {
assert(polar.IsValid());
}
