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/*
* Copyright (c) 2021, Jagger De Leo <jcdl@fastmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibGUI/Application.h>
#include <LibGUI/Event.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Widget.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
struct Coordinate {
int x;
int y;
int z;
operator Gfx::IntPoint() const
{
return { x, y };
}
};
class Starfield final : public GUI::Widget {
C_OBJECT(Starfield)
public:
virtual ~Starfield() override;
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 mousedown_event(GUI::MouseEvent& event) override;
virtual void mousemove_event(GUI::MouseEvent& event) override;
Vector<Coordinate> m_stars;
int m_sweep_plane = 2000;
unsigned m_speed = 1;
};
Starfield::Starfield(int interval)
{
srand(time(nullptr));
stop_timer();
start_timer(interval);
}
void Starfield::create_stars(int width, int height, int stars)
{
m_bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, { width, height }).release_value_but_fixme_should_propagate_errors();
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();
}
Starfield::~Starfield()
{
}
void Starfield::mousemove_event(GUI::MouseEvent&)
{
}
void Starfield::mousedown_event(GUI::MouseEvent&)
{
GUI::Application::the()->quit();
}
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:
GUI::Application::the()->quit();
}
}
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);
}
int main(int argc, char** argv)
{
if (pledge("stdio recvfd sendfd rpath unix", nullptr) < 0) {
perror("pledge");
return 1;
}
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(argc, argv);
auto app = GUI::Application::construct(argc, argv);
if (pledge("stdio recvfd sendfd rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
auto app_icon = GUI::Icon::default_icon("app-screensaver");
auto window = GUI::Window::construct();
window->set_double_buffering_enabled(true);
window->set_title("Starfield");
window->set_resizable(false);
window->set_frameless(true);
window->set_fullscreen(true);
window->set_minimizable(false);
window->set_icon(app_icon.bitmap_for_size(16));
auto& starfield_window = 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();
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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