mpusz/mp-units
1
0
Fork 1
mirror of https://github.com/mpusz/mp-units.git synced 2025-07-29 18:07:16 +02:00
Code Issues Packages Projects Releases Wiki Activity

refactor: References are now guarded UNITS_REFERENCES with (ON by default) + examples duplicated to subdirectories

Browse Source 
Now References can be disabled to meassure a compile time impact. Also the same examples are now provided in two subdirectories to be able to easily compare the pros and cons of every quantity construction technique.
This commit is contained in:
Mateusz Pusz
2021-04-06 15:57:28 +02:00
parent b842c3f94a
commit b982921d27
118 changed files with 2841 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

166
example/glide_computer.cpp
View File

@ -1,166 +0,0 @@
// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "glide_computer.h"
#include <numeric>
#include <string_view>
namespace glide_computer {
using namespace units::isq;
task::legs task::make_legs(const waypoints& wpts)
{
task::legs res;
res.reserve(wpts.size() - 1);
auto to_leg = [](const waypoint& w1, const waypoint& w2) { return task::leg(w1, w2); };
std::ranges::transform(wpts.cbegin(), prev(wpts.cend()), next(wpts.cbegin()), wpts.cend(), std::back_inserter(res), to_leg);
return res;
}
std::vector<distance> task::make_leg_total_distances(const legs& legs)
{
std::vector<distance> res;
res.reserve(legs.size());
auto to_length = [](const leg& l) { return l.get_length(); };
std::transform_inclusive_scan(legs.cbegin(), legs.cend(), std::back_inserter(res), std::plus(), to_length);
return res;
}
altitude terrain_level_alt(const task& t, const flight_point& pos)
{
const task::leg& l = t.get_legs()[pos.leg_idx];
const height alt_diff = l.end().alt - l.begin().alt;
return l.begin().alt + alt_diff * ((pos.dist - t.get_leg_dist_offset(pos.leg_idx)) / l.get_length()).common();
}
// Returns `x` of the intersection of a glide line and a terrain line.
// y = -x / glide_ratio + pos.alt;
// y = (finish_alt - ground_alt) / dist_to_finish * x + ground_alt + min_agl_height;
distance glide_distance(const flight_point& pos, const glider& g, const task& t, const safety& s, altitude ground_alt)
{
const auto dist_to_finish = t.get_length() - pos.dist;
return distance((ground_alt + s.min_agl_height - pos.alt).common() /
((ground_alt - t.get_finish().alt) / dist_to_finish - 1 / glide_ratio(g.polar[0])));
}
}
namespace {
using namespace glide_computer;
void print(std::string_view phase_name, timestamp start_ts, const glide_computer::flight_point& point, const glide_computer::flight_point& new_point)
{
fmt::print(
"| {:<12} | {:>9%.1Q %q} (Total: {:>9%.1Q %q}) | {:>8%.1Q %q} (Total: {:>8%.1Q %q}) | {:>7%.0Q %q} ({:>6%.0Q %q}) |\n",
phase_name, quantity_cast<si::minute>(new_point.ts - point.ts), quantity_cast<si::minute>(new_point.ts - start_ts),
new_point.dist - point.dist, new_point.dist, new_point.alt - point.alt, new_point.alt);
}
flight_point takeoff(timestamp start_ts, const task& t)
{
return {start_ts, t.get_start().alt};
}
flight_point tow(timestamp start_ts, const flight_point& pos, const aircraft_tow& at)
{
const duration d = (at.height_agl / at.performance).common();
const flight_point new_pos{pos.ts + d, pos.alt + at.height_agl, pos.leg_idx, pos.dist};
print("Tow", start_ts, pos, new_pos);
return new_pos;
}
flight_point circle(timestamp start_ts, const flight_point& pos, const glider& g, const weather& w, const task& t, height& height_to_gain)
{
const height h_agl = agl(pos.alt, terrain_level_alt(t, pos));
const height circling_height = std::min(w.cloud_base - h_agl, height_to_gain);
const rate_of_climb circling_rate = w.thermal_strength + g.polar[0].climb;
const duration d = (circling_height / circling_rate).common();
const flight_point new_pos{pos.ts + d, pos.alt + circling_height, pos.leg_idx, pos.dist};
height_to_gain -= circling_height;
print("Circle", start_ts, pos, new_pos);
return new_pos;
}
flight_point glide(timestamp start_ts, const flight_point& pos, const glider& g, const task& t, const safety& s)
{
const auto ground_alt = terrain_level_alt(t, pos);
const auto dist = glide_distance(pos, g, t, s, ground_alt);
const auto new_distance = pos.dist + dist;
const auto alt = ground_alt + s.min_agl_height;
const auto l3d = length_3d(dist, pos.alt - alt);
const duration d = l3d / g.polar[0].v.common();
const flight_point new_pos{pos.ts + d, terrain_level_alt(t, pos) + s.min_agl_height, t.get_leg_index(new_distance), new_distance};
print("Glide", start_ts, pos, new_pos);
return new_pos;
}
flight_point final_glide(timestamp start_ts, const flight_point& pos, const glider& g, const task& t)
{
const auto dist = t.get_length() - pos.dist;
const auto l3d = length_3d(dist, pos.alt - t.get_finish().alt);
const duration d = l3d / g.polar[0].v.common();
const flight_point new_pos{pos.ts + d, t.get_finish().alt, t.get_legs().size() - 1, pos.dist + dist};
print("Final Glide", start_ts, pos, new_pos);
return new_pos;
}
} // namespace
namespace glide_computer {
void estimate(timestamp start_ts, const glider& g, const weather& w, const task& t, const safety& s, const aircraft_tow& at)
{
fmt::print("| {:<12} | {:^28} | {:^26} | {:^21} |\n", "Flight phase", "Duration", "Distance", "Height");
fmt::print("|{0:-^14}|{0:-^30}|{0:-^28}|{0:-^23}|\n", "");
// ready to takeoff
flight_point pos = takeoff(start_ts, t);
// estimate aircraft towing
pos = tow(start_ts, pos, at);
// estimate the altitude needed to reach the finish line from this place
const altitude final_glide_alt = t.get_finish().alt + height(t.get_length().common() / glide_ratio(g.polar[0]));
// how much height we still need to gain in the thermalls to reach the destination?
height height_to_gain = final_glide_alt - pos.alt;
do {
// glide to the next thermall
pos = glide(start_ts, pos, g, t, s);
// circle in a thermall to gain height
pos = circle(start_ts, pos, g, w, t, height_to_gain);
} while (height_to_gain > height{});
// final glide
pos = final_glide(start_ts, pos, g, t);
}
} // namespace glide_computer