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Move electron crystal example to separate project

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Nikita Lisitsa 2022-12-08 19:30:07 +03:00
parent 592fb437e7
commit 30c35fd768
1 changed files with 0 additions and 406 deletions
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examples/electron_crystal.cpp
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#include <psemek/app/app.hpp>
#include <psemek/app/main.hpp>
#include <psemek/gfx/painter.hpp>
#include <psemek/geom/orthographic.hpp>
#include <psemek/random/device.hpp>
#include <psemek/random/generator.hpp>
#include <psemek/random/uniform_ball.hpp>
#include <psemek/cg/triangulation/delaunay.hpp>
#include <psemek/util/clock.hpp>
#include <psemek/prof/profiler.hpp>
#include <psemek/app/ui_scene.hpp>
#include <psemek/ui/button.hpp>
#include <psemek/ui/slider.hpp>
#include <psemek/ui/default_element_factory.hpp>
#include <psemek/ui/frame.hpp>
#include <psemek/ui/window.hpp>
#include <psemek/ui/screen.hpp>
#include <psemek/ui/grid_layout.hpp>
#include <psemek/ui/event_interceptor.hpp>
#include <psemek/util/to_string.hpp>
#include <psemek/util/recursive.hpp>
#include <psemek/util/moving_average.hpp>
#include <vector>
using namespace psemek;
struct main_scene
: app::ui_scene
{
main_scene(ui::controller & ui_controller);
void update() override;
void present() override;
float simulation_radius = 1.f;
float simulation_radius_tgt = 1.f;
float potential = 1000.f;
float step = 1e-4f;
float multipole_threshold = 2.f;
std::shared_ptr<ui::label> time_value_label;
random::generator rng{random::device{}};
std::vector<geom::point<float, 2>> points;
std::vector<geom::segment<std::uint32_t>> edges;
std::vector<std::uint32_t> degree;
gfx::painter painter;
util::clock<> clock;
util::moving_average<float> update_time{64};
};
main_scene::main_scene(ui::controller & ui_controller)
: app::ui_scene(ui_controller)
{
ui::default_element_factory element_factory;
auto root = element_factory.make_screen();
auto wheel_event = std::make_shared<ui::event_interceptor>();
wheel_event->on_mouse_wheel([this](ui::mouse_wheel const & event){
simulation_radius_tgt *= std::pow(0.8f, event.delta);
return true;
});
wheel_event->set_child(element_factory.make_screen());
root->add_child(wheel_event, ui::screen::x_policy::fill, ui::screen::y_policy::fill);
auto panel = element_factory.make_window("");
panel->caption()->set_tagged_text("[bold][uline]Options[/uline][/bold]");
root->add_child(panel, ui::screen::x_policy::floating, ui::screen::y_policy::floating);
auto layout = element_factory.make_grid_layout();
panel->set_child(layout);
auto count_name_label = element_factory.make_label("Count:");
count_name_label->set_valign(ui::label::valignment::center);
count_name_label->set_halign(ui::label::halignment::right);
auto count_value_label = element_factory.make_label("");
count_value_label->set_valign(ui::label::valignment::center);
count_value_label->set_halign(ui::label::halignment::center);
auto count_slider = element_factory.make_slider();
count_slider->set_value_range({1, 5000}, false);
count_slider->on_value_changed([this, count_value_label](int value){
count_value_label->set_text(util::to_string(value));
if (value < points.size())
points.resize(value);
else
{
float radius = std::max(0.5f, std::sqrt((points.size() + value) / 1000.f));
random::uniform_sphere_point_distribution<float, 2> d({0.f, 0.f}, radius * 1.25f);
while (points.size() < value)
points.push_back(d(rng));
}
});
count_slider->set_value(100);
auto step_name_label = element_factory.make_label("Step:");
step_name_label->set_valign(ui::label::valignment::center);
step_name_label->set_halign(ui::label::halignment::right);
auto step_value_label = element_factory.make_label("");
step_value_label->set_valign(ui::label::valignment::center);
step_value_label->set_halign(ui::label::halignment::center);
auto step_slider = element_factory.make_slider();
step_slider->set_value_range({0, 12}, false);
step_slider->on_value_changed([this, step_value_label](int value){
step = std::pow(2.f, value - 20);
step_value_label->set_text(util::to_string(std::setprecision(1), std::scientific, step));
});
step_slider->set_value(11);
auto precision_name_label = element_factory.make_label("Precision:");
precision_name_label->set_valign(ui::label::valignment::center);
precision_name_label->set_halign(ui::label::halignment::right);
auto precision_value_label = element_factory.make_label("");
precision_value_label->set_valign(ui::label::valignment::center);
precision_value_label->set_halign(ui::label::halignment::center);
auto precision_slider = element_factory.make_slider();
precision_slider->set_value_range({5, 50}, false);
precision_slider->on_value_changed([this, precision_value_label](int value){
multipole_threshold = value * 0.1f;
precision_value_label->set_text(util::to_string(std::setprecision(1), std::fixed, multipole_threshold));
});
precision_slider->set_value(15);
auto time_name_label = element_factory.make_label("Computation time:");
time_name_label->set_valign(ui::label::valignment::center);
time_name_label->set_halign(ui::label::halignment::right);
time_value_label = element_factory.make_label("");
time_value_label->set_valign(ui::label::valignment::center);
time_value_label->set_halign(ui::label::halignment::center);
layout->set_size(4, 3);
layout->set_column_weight(0, 0.5f);
layout->set_column_weight(1, 0.5f);
layout->set(0, 0, count_name_label);
layout->set(0, 1, count_value_label);
layout->set(0, 2, count_slider);
layout->set(1, 0, step_name_label);
layout->set(1, 1, step_value_label);
layout->set(1, 2, step_slider);
layout->set(2, 0, precision_name_label);
layout->set(2, 1, precision_value_label);
layout->set(2, 2, precision_slider);
layout->set(3, 0, time_name_label);
layout->set(3, 1, time_value_label);
ui::style style;
style.font = ui::make_default_9x12_font();
style.bold_font = ui::make_default_10x12_bold_font();
style.text_scale = 1;
style.bg_color = gfx::color_rgba{127, 127, 191, 255};
style.fg_color = gfx::color_rgba{127, 127, 255, 255};
style.action_color = gfx::color_rgba{0, 0, 255, 255};
style.highlight_color = gfx::color_rgba{0, 255, 255, 255};
style.border_width = 0;
style.bevel_width = 0;
root->set_style(std::make_shared<ui::style>(std::move(style)));
set_ui(root);
}
struct node
{
static constexpr std::uint32_t null = -1;
float size;
float mass = 0.f;
geom::point<float, 2> center = geom::point<float, 2>::zero();
std::uint32_t children[2][2] {{null, null}, {null, null}};
};
void main_scene::update()
{
ui_scene::update();
float const dt = clock.restart().count();
const int iterations = 1;
auto const origin = geom::point<float, 2>::zero();
std::vector<node> nodes;
std::uint32_t root;
auto add_node = util::recursive([&](auto && self, geom::box<float, 2> const & bbox, auto begin, auto end) -> std::uint32_t
{
if (begin == end)
return node::null;
std::uint32_t id = nodes.size();
nodes.emplace_back().size = bbox[0].length();
if (end - begin > 1)
{
auto middle_x = bbox[0].center();
auto middle_y = bbox[1].center();
auto mid_it = std::partition(begin, end, [middle_x](auto const & p){ return p[0] < middle_x; });
auto left_mid_it = std::partition(begin, mid_it, [middle_y](auto const & p){ return p[1] < middle_y; });
auto right_mid_it = std::partition(mid_it, end, [middle_y](auto const & p){ return p[1] < middle_y; });
nodes[id].children[0][0] = self(geom::box<float, 2>{{{bbox[0].min, middle_x}, {bbox[1].min, middle_y}}}, begin, left_mid_it);
nodes[id].children[0][1] = self(geom::box<float, 2>{{{bbox[0].min, middle_x}, {middle_y, bbox[1].max}}}, left_mid_it, mid_it);
nodes[id].children[1][0] = self(geom::box<float, 2>{{{middle_x, bbox[0].max}, {bbox[1].min, middle_y}}}, mid_it, right_mid_it);
nodes[id].children[1][1] = self(geom::box<float, 2>{{{middle_x, bbox[0].max}, {middle_y, bbox[1].max}}}, right_mid_it, end);
geom::vector<float, 2> sum{0.f, 0.f};
for (int x : {0, 1})
{
for (int y : {0, 1})
{
auto cid = nodes[id].children[x][y];
if (cid != node::null)
{
nodes[id].mass += nodes[cid].mass;
sum += (nodes[cid].center - origin) * nodes[cid].mass;
}
}
}
nodes[id].center = origin + sum / nodes[id].mass;
}
else
{
nodes[id].mass = 1.f;
nodes[id].center = *begin;
}
return id;
});
{
float max_size = 0.f;
for (auto const & p : points)
geom::make_max(max_size, geom::distance(p, origin));
prof::profiler prof("tree");
root = add_node(geom::box<float, 2>{{{-max_size, max_size}, {-max_size, max_size}}}, points.begin(), points.end());
}
auto force_at = util::recursive([&](auto && self, auto const & p, auto id){
auto const & n = nodes[id];
if (n.center == p)
return geom::vector{0.f, 0.f};
auto d = p - n.center;
auto l = geom::length(d);
if (n.mass == 1.f || l > n.size * multipole_threshold)
return n.mass * d / std::pow(l, 3.f);
geom::vector sum{0.f, 0.f};
for (int x : {0, 1})
{
for (int y : {0, 1})
{
auto cid = nodes[id].children[x][y];
if (cid != node::null)
sum += self(p, cid);
}
}
return sum;
});
std::vector<geom::vector<float, 2>> delta;
for (int iteration = 0; iteration < iterations; ++iteration)
{
prof::profiler prof("descent");
delta.assign(points.size(), geom::vector<float, 2>::zero());
for (std::size_t i = 0; i < points.size(); ++i)
delta[i] += 2.f * potential * (origin - points[i]);
// Exact O(n^2) method
// for (std::size_t i = 0; i < points.size(); ++i)
// {
// for (std::size_t j = i + 1; j < points.size(); ++j)
// {
// auto d = points[i] - points[j];
// d /= std::pow(geom::length(d), 3.f);
// delta[i] += d;
// delta[j] -= d;
// }
// }
// Barnes-Hut algorithm
for (std::size_t i = 0; i < points.size(); ++i)
delta[i] += force_at(points[i], root);
for (std::size_t i = 0; i < points.size(); ++i)
points[i] += delta[i] * step * dt;
}
simulation_radius += (simulation_radius_tgt - simulation_radius) * (1.f - std::exp(-10.f * dt));
prof::profiler prof("delaunay");
auto const dcel = cg::delaunay<std::uint32_t>(geom::robust, points.begin(), points.end());
edges.clear();
degree.assign(points.size(), 0);
for (std::size_t i = 0; i < dcel.edges.size(); ++i)
{
auto const e = dcel.edge(i);
auto const v0 = e.origin().index();
auto const v1 = e.twin().origin().index();
if (v0 < v1)
edges.push_back({v0, v1});
degree[v0]++;
}
update_time.push(clock.count());
time_value_label->set_text(util::to_string(std::setprecision(3), std::fixed, update_time.average() * 1000.f, "ms"));
}
void main_scene::present()
{
gl::ClearColor(1.f, 1.f, 1.f, 0.f);
gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT);
geom::box<float, 3> view_area;
{
view_area[0] = {-simulation_radius, simulation_radius};
view_area[1] = {-simulation_radius, simulation_radius};
view_area[2] = {-1.f, 1.f};
float const aspect_ratio = width() * 1.f / height();
float extra_y = view_area[1].length() * 0.1f;
view_area[1].min -= extra_y;
view_area[1].max += extra_y;
float extra_x = view_area[1].length() * aspect_ratio - view_area[0].length();
view_area[0].min -= extra_x / 2.f;
view_area[0].max += extra_x / 2.f;
}
geom::matrix<float, 4, 4> const transform = geom::orthographic{view_area}.homogeneous_matrix();
float const pixel_size = view_area[0].length() / width();
for (auto const & e : edges)
painter.line(points[e[0]], points[e[1]], 2.f * pixel_size, {127, 127, 127, 255}, false);
for (std::size_t i = 0; i < points.size(); ++i)
{
gfx::color_rgba color{0, 0, 0, 255};
int quality = 6;
if (degree[i] == 5)
{
quality = 3;
color = {255, 0, 0, 255};
}
else if (degree[i] == 7)
{
quality = 4;
color = {0, 0, 255, 255};
}
painter.circle(points[i], 6.f * pixel_size, color, quality);
}
painter.render(transform);
ui_scene::present();
}
struct electron_crystal_app
: app::app
{
electron_crystal_app();
~electron_crystal_app();
async::event_loop event_loop;
ui::controller ui_controller;
};
electron_crystal_app::electron_crystal_app()
: app("Electron crystal simulation", 4)
, ui_controller(&event_loop)
{
push_scene(std::make_shared<main_scene>(ui_controller));
}
electron_crystal_app::~electron_crystal_app()
{
prof::dump();
}
int main()
{
return app::main<electron_crystal_app>();
}