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/*
* Copyright (c) 2021, Jagger De Leo <jcdl@fastmail.com>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibDesktop/Screensaver.h>
#include <LibGUI/Application.h>
#include <LibGUI/Event.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>
#include <LibMain/Main.h>
#include <stdio.h>
#include <time.h>
struct Coordinate {
int x;
int y;
int z;
operator Gfx::IntPoint() const
{
return { x, y };
}
};
class Starfield final : public Desktop::Screensaver {
C_OBJECT(Starfield)
public:
virtual ~Starfield() override = default;
ErrorOr<void> create_stars(int, int, int);
void set_speed(unsigned speed) { m_speed = speed; }
private:
Starfield(int);
RefPtr<Gfx::Bitmap> m_bitmap;
void draw();
virtual void paint_event(GUI::PaintEvent&) override;
virtual void timer_event(Core::TimerEvent&) override;
virtual void keydown_event(GUI::KeyEvent&) override;
virtual void mousewheel_event(GUI::MouseEvent&) override;
Vector<Coordinate> m_stars;
int m_sweep_plane = 2000;
unsigned m_speed = 1;
};
Starfield::Starfield(int interval)
{
on_screensaver_exit = []() { GUI::Application::the()->quit(); };
srand(time(nullptr));
stop_timer();
start_timer(interval);
}
ErrorOr<void> Starfield::create_stars(int width, int height, int stars)
{
m_bitmap = TRY(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, { width, height }));
m_stars.grow_capacity(stars);
for (int i = 0; i < stars; i++) {
m_stars.append({ rand() % width - width / 2,
rand() % height - height / 2,
rand() % 1999 + 1 });
}
draw();
return {};
}
void Starfield::keydown_event(GUI::KeyEvent& event)
{
switch (event.key()) {
case Key_Plus:
m_speed++;
break;
case Key_Minus:
if (--m_speed < 1)
m_speed = 1;
break;
default:
Desktop::Screensaver::keydown_event(event);
}
}
void Starfield::mousewheel_event(GUI::MouseEvent& event)
{
if (event.wheel_delta_y() == 0)
return;
m_speed += event.wheel_delta_y() > 0 ? -1 : 1;
if (m_speed < 1)
m_speed = 1;
}
void Starfield::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.draw_scaled_bitmap(rect(), *m_bitmap, m_bitmap->rect());
}
void Starfield::timer_event(Core::TimerEvent&)
{
m_bitmap->fill(Color::Black);
auto computed_point = Gfx::IntPoint();
auto half_x = width() / 2;
auto half_y = height() / 2;
GUI::Painter painter(*m_bitmap);
for (auto star : m_stars) {
auto z = ((star.z + m_sweep_plane) % 2000) * 0.0005;
computed_point.set_x(half_x + star.x / z);
computed_point.set_y(half_y + star.y / z);
auto computed_end_point = Gfx::IntPoint();
auto z_end = ((star.z + m_sweep_plane - m_speed) % 2000) * 0.0005;
computed_end_point.set_x(half_x + star.x / z_end);
computed_end_point.set_y(half_y + star.y / z_end);
if (computed_point.x() < 0 || computed_point.x() >= width() || computed_point.y() < 0 || computed_point.y() >= height())
continue;
u8 falloff = (1 - z * z) * 255;
painter.draw_line(computed_point, computed_end_point, Color(falloff, falloff, falloff));
}
m_sweep_plane -= m_speed;
if (m_sweep_plane < 0)
m_sweep_plane = 2000;
update();
}
void Starfield::draw()
{
GUI::Painter painter(*m_bitmap);
painter.fill_rect(m_bitmap->rect(), Color::Black);
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio recvfd sendfd rpath unix"));
unsigned star_count = 1000;
unsigned refresh_rate = 16;
unsigned speed = 1;
Core::ArgsParser args_parser;
args_parser.set_general_help("The classic starfield screensaver.");
args_parser.add_option(star_count, "Number of stars to draw (default = 1000)", "stars", 'c', "number");
args_parser.add_option(refresh_rate, "Refresh rate (default = 16)", "rate", 'r', "milliseconds");
args_parser.add_option(speed, "Speed (default = 1)", "speed", 's', "number");
args_parser.parse(arguments);
auto app = TRY(GUI::Application::try_create(arguments));
TRY(Core::System::pledge("stdio recvfd sendfd rpath"));
auto window = TRY(Desktop::Screensaver::create_window("Starfield"sv, "app-starfield"sv));
auto starfield_window = TRY(window->set_main_widget<Starfield>(refresh_rate));
starfield_window->set_fill_with_background_color(false);
starfield_window->set_override_cursor(Gfx::StandardCursor::Hidden);
starfield_window->update();
window->show();
TRY(starfield_window->create_stars(window->width(), window->height(), star_count));
starfield_window->set_speed(speed);
starfield_window->update();
window->move_to_front();
window->set_cursor(Gfx::StandardCursor::Hidden);
window->update();
return app->exec();
}
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