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use std::{f32::consts::PI, time::Instant};
use iced::mouse;
use iced::widget::canvas::{
self, stroke, Cache, Canvas, Geometry, Path, Stroke,
};
use iced::window;
use iced::{Element, Fill, Point, Rectangle, Renderer, Subscription, Theme};
pub fn main() -> iced::Result {
iced::application("Arc - Iced", Arc::update, Arc::view)
.subscription(Arc::subscription)
.theme(|_| Theme::Dark)
.antialiasing(true)
.run()
}
struct Arc {
start: Instant,
cache: Cache,
}
#[derive(Debug, Clone, Copy)]
enum Message {
Tick,
}
impl Arc {
fn update(&mut self, _: Message) {
self.cache.clear();
}
fn view(&self) -> Element<Message> {
Canvas::new(self).width(Fill).height(Fill).into()
}
fn subscription(&self) -> Subscription<Message> {
window::frames().map(|_| Message::Tick)
}
}
impl Default for Arc {
fn default() -> Self {
Arc {
start: Instant::now(),
cache: Cache::default(),
}
}
}
impl<Message> canvas::Program<Message> for Arc {
type State = ();
fn draw(
&self,
_state: &Self::State,
renderer: &Renderer,
theme: &Theme,
bounds: Rectangle,
_cursor: mouse::Cursor,
) -> Vec<Geometry> {
let geometry = self.cache.draw(renderer, bounds.size(), |frame| {
let palette = theme.palette();
let center = frame.center();
let radius = frame.width().min(frame.height()) / 5.0;
let start = Point::new(center.x, center.y - radius);
let angle = (self.start.elapsed().as_millis() % 10_000) as f32
/ 10_000.0
* 2.0
* PI;
let end = Point::new(
center.x + radius * angle.cos(),
center.y + radius * angle.sin(),
);
let circles = Path::new(|b| {
b.circle(start, 10.0);
b.move_to(end);
b.circle(end, 10.0);
});
frame.fill(&circles, palette.text);
let path = Path::new(|b| {
b.move_to(start);
b.arc_to(center, end, 50.0);
b.line_to(end);
});
frame.stroke(
&path,
Stroke {
style: stroke::Style::Solid(palette.text),
width: 10.0,
..Stroke::default()
},
);
});
vec![geometry]
}
}
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