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use iced::mouse;
use iced::time::{self, milliseconds};
use iced::widget::canvas::{stroke, Cache, Geometry, LineCap, Path, Stroke};
use iced::widget::{canvas, container};
use iced::{alignment, Radians};
use iced::{
Degrees, Element, Fill, Font, Point, Rectangle, Renderer, Size,
Subscription, Theme, Vector,
};
pub fn main() -> iced::Result {
tracing_subscriber::fmt::init();
iced::application("Clock - Iced", Clock::update, Clock::view)
.subscription(Clock::subscription)
.theme(Clock::theme)
.antialiasing(true)
.run()
}
struct Clock {
now: chrono::DateTime<chrono::Local>,
clock: Cache,
}
#[derive(Debug, Clone, Copy)]
enum Message {
Tick(chrono::DateTime<chrono::Local>),
}
impl Clock {
fn update(&mut self, message: Message) {
match message {
Message::Tick(local_time) => {
let now = local_time;
if now != self.now {
self.now = now;
self.clock.clear();
}
}
}
}
fn view(&self) -> Element<Message> {
let canvas = canvas(self as &Self).width(Fill).height(Fill);
container(canvas).padding(20).into()
}
fn subscription(&self) -> Subscription<Message> {
time::every(milliseconds(500))
.map(|_| Message::Tick(chrono::offset::Local::now()))
}
fn theme(&self) -> Theme {
Theme::ALL[(self.now.timestamp() as usize / 10) % Theme::ALL.len()]
.clone()
}
}
impl Default for Clock {
fn default() -> Self {
Self {
now: chrono::offset::Local::now(),
clock: Cache::default(),
}
}
}
impl<Message> canvas::Program<Message> for Clock {
type State = ();
fn draw(
&self,
_state: &Self::State,
renderer: &Renderer,
theme: &Theme,
bounds: Rectangle,
_cursor: mouse::Cursor,
) -> Vec<Geometry> {
use chrono::Timelike;
let clock = self.clock.draw(renderer, bounds.size(), |frame| {
let palette = theme.extended_palette();
let center = frame.center();
let radius = frame.width().min(frame.height()) / 2.0;
let background = Path::circle(center, radius);
frame.fill(&background, palette.secondary.strong.color);
let short_hand =
Path::line(Point::ORIGIN, Point::new(0.0, -0.5 * radius));
let long_hand =
Path::line(Point::ORIGIN, Point::new(0.0, -0.8 * radius));
let width = radius / 100.0;
let thin_stroke = || -> Stroke {
Stroke {
width,
style: stroke::Style::Solid(palette.secondary.strong.text),
line_cap: LineCap::Round,
..Stroke::default()
}
};
let wide_stroke = || -> Stroke {
Stroke {
width: width * 3.0,
style: stroke::Style::Solid(palette.secondary.strong.text),
line_cap: LineCap::Round,
..Stroke::default()
}
};
frame.translate(Vector::new(center.x, center.y));
let minutes_portion =
Radians::from(hand_rotation(self.now.minute(), 60)) / 12.0;
let hour_hand_angle =
Radians::from(hand_rotation(self.now.hour(), 12))
+ minutes_portion;
frame.with_save(|frame| {
frame.rotate(hour_hand_angle);
frame.stroke(&short_hand, wide_stroke());
});
frame.with_save(|frame| {
frame.rotate(hand_rotation(self.now.minute(), 60));
frame.stroke(&long_hand, wide_stroke());
});
frame.with_save(|frame| {
let rotation = hand_rotation(self.now.second(), 60);
frame.rotate(rotation);
frame.stroke(&long_hand, thin_stroke());
let rotate_factor = if rotation < 180.0 { 1.0 } else { -1.0 };
frame.rotate(Degrees(-90.0 * rotate_factor));
frame.fill_text(canvas::Text {
content: theme.to_string(),
size: (radius / 15.0).into(),
position: Point::new(
(0.78 * radius) * rotate_factor,
-width * 2.0,
),
color: palette.secondary.strong.text,
horizontal_alignment: if rotate_factor > 0.0 {
alignment::Horizontal::Right
} else {
alignment::Horizontal::Left
},
vertical_alignment: alignment::Vertical::Bottom,
font: Font::MONOSPACE,
..canvas::Text::default()
});
});
// Draw clock numbers
for hour in 1..=12 {
let angle = Radians::from(hand_rotation(hour, 12))
- Radians::from(Degrees(90.0));
let x = radius * angle.0.cos();
let y = radius * angle.0.sin();
frame.fill_text(canvas::Text {
content: format!("{}", hour),
size: (radius / 5.0).into(),
position: Point::new(x * 0.82, y * 0.82),
color: palette.secondary.strong.text,
horizontal_alignment: alignment::Horizontal::Center,
vertical_alignment: alignment::Vertical::Center,
font: Font::MONOSPACE,
..canvas::Text::default()
});
}
// Draw ticks
for tick in 0..60 {
let angle = hand_rotation(tick, 60);
let width = if tick % 5 == 0 { 3.0 } else { 1.0 };
frame.with_save(|frame| {
frame.rotate(angle);
frame.fill(
&Path::rectangle(
Point::new(0.0, radius - 15.0),
Size::new(width, 7.0),
),
palette.secondary.strong.text,
);
});
}
});
vec![clock]
}
}
fn hand_rotation(n: u32, total: u32) -> Degrees {
let turns = n as f32 / total as f32;
Degrees(360.0 * turns)
}
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