diff options
| -rw-r--r-- | Cargo.toml | 1 | ||||
| -rw-r--r-- | examples/solar_system/Cargo.toml | 15 | ||||
| -rw-r--r-- | examples/solar_system/src/main.rs | 244 |
3 files changed, 260 insertions, 0 deletions
@@ -46,6 +46,7 @@ members = [ "examples/integration", "examples/pokedex", "examples/progress_bar", + "examples/solar_system", "examples/stopwatch", "examples/styling", "examples/svg", diff --git a/examples/solar_system/Cargo.toml b/examples/solar_system/Cargo.toml new file mode 100644 index 00000000..c88cda50 --- /dev/null +++ b/examples/solar_system/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "solar_system" +version = "0.1.0" +authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"] +edition = "2018" +publish = false + +[features] +canvas = [] + +[dependencies] +iced = { path = "../..", features = ["canvas", "async-std", "debug"] } +iced_native = { path = "../../native" } +async-std = { version = "1.0", features = ["unstable"] } +rand = "0.7" diff --git a/examples/solar_system/src/main.rs b/examples/solar_system/src/main.rs new file mode 100644 index 00000000..d05acf84 --- /dev/null +++ b/examples/solar_system/src/main.rs @@ -0,0 +1,244 @@ +//! An animated solar system. +//! +//! This example showcases how to use a `Canvas` widget with transforms to draw +//! using different coordinate systems. +//! +//! Inspired by the example found in the MDN docs[1]. +//! +//! [1]: https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Basic_animations#An_animated_solar_system +use iced::{ + canvas, executor, Application, Canvas, Color, Command, Container, Element, + Length, Point, Settings, Size, Subscription, Vector, +}; + +use std::time::Instant; + +pub fn main() { + SolarSystem::run(Settings::default()) +} + +struct SolarSystem { + state: State, + solar_system: canvas::layer::Cached<State>, +} + +#[derive(Debug, Clone, Copy)] +enum Message { + Tick(Instant), +} + +impl Application for SolarSystem { + type Executor = executor::Default; + type Message = Message; + + fn new() -> (Self, Command<Message>) { + ( + SolarSystem { + state: State::new(), + solar_system: canvas::layer::Cached::new(), + }, + Command::none(), + ) + } + + fn title(&self) -> String { + String::from("Solar system - Iced") + } + + fn update(&mut self, message: Message) -> Command<Message> { + match message { + Message::Tick(instant) => { + self.state.update(instant); + self.solar_system.clear(); + } + } + + Command::none() + } + + fn subscription(&self) -> Subscription<Message> { + time::every(std::time::Duration::from_millis(10)) + .map(|instant| Message::Tick(instant)) + } + + fn view(&mut self) -> Element<Message> { + let canvas = Canvas::new() + .width(Length::Fill) + .height(Length::Fill) + .push(self.solar_system.with(&self.state)); + + Container::new(canvas) + .width(Length::Fill) + .height(Length::Fill) + .center_x() + .center_y() + .into() + } +} + +#[derive(Debug)] +struct State { + start: Instant, + current: Instant, + stars: Vec<(Point, f32)>, +} + +impl State { + const SUN_RADIUS: f32 = 70.0; + const ORBIT_RADIUS: f32 = 150.0; + const EARTH_RADIUS: f32 = 12.0; + const MOON_RADIUS: f32 = 4.0; + const MOON_DISTANCE: f32 = 28.0; + + pub fn new() -> State { + let now = Instant::now(); + let (width, height) = Settings::default().window.size; + + State { + start: now, + current: now, + stars: { + use rand::Rng; + + let mut rng = rand::thread_rng(); + + (0..100) + .map(|_| { + ( + Point::new( + rng.gen_range(0.0, width as f32), + rng.gen_range(0.0, height as f32), + ), + rng.gen_range(0.5, 1.0), + ) + }) + .collect() + }, + } + } + + pub fn update(&mut self, now: Instant) { + self.current = now; + } +} + +impl canvas::layer::Drawable for State { + fn draw(&self, frame: &mut canvas::Frame) { + use canvas::{Fill, Path, Stroke}; + use std::f32::consts::PI; + + let center = frame.center(); + + let space = Path::new(|path| { + path.rectangle(Point::new(0.0, 0.0), frame.size()) + }); + + let stars = Path::new(|path| { + for (p, size) in &self.stars { + path.rectangle(*p, Size::new(*size, *size)); + } + }); + + let sun = Path::new(|path| path.circle(center, Self::SUN_RADIUS)); + let orbit = Path::new(|path| path.circle(center, Self::ORBIT_RADIUS)); + + frame.fill(&space, Fill::Color(Color::BLACK)); + frame.fill(&stars, Fill::Color(Color::WHITE)); + frame.fill(&sun, Fill::Color(Color::from_rgb8(0xF9, 0xD7, 0x1C))); + frame.stroke( + &orbit, + Stroke { + width: 1.0, + color: Color::from_rgba8(0, 153, 255, 0.1), + ..Stroke::default() + }, + ); + + let elapsed = self.current - self.start; + let elapsed_seconds = elapsed.as_secs() as f32; + let elapsed_millis = elapsed.subsec_millis() as f32; + + frame.with_save(|frame| { + frame.translate(Vector::new(center.x, center.y)); + frame.rotate( + (2.0 * PI / 60.0) * elapsed_seconds + + (2.0 * PI / 60_000.0) * elapsed_millis, + ); + frame.translate(Vector::new(Self::ORBIT_RADIUS, 0.0)); + + let earth = Path::new(|path| { + path.circle(Point::ORIGIN, Self::EARTH_RADIUS) + }); + + let shadow = Path::new(|path| { + path.rectangle( + Point::new(0.0, -Self::EARTH_RADIUS), + Size::new( + Self::EARTH_RADIUS * 4.0, + Self::EARTH_RADIUS * 2.0, + ), + ) + }); + + frame.fill(&earth, Fill::Color(Color::from_rgb8(0x6B, 0x93, 0xD6))); + + frame.with_save(|frame| { + frame.rotate( + ((2.0 * PI) / 6.0) * elapsed_seconds + + ((2.0 * PI) / 6_000.0) * elapsed_millis, + ); + frame.translate(Vector::new(0.0, Self::MOON_DISTANCE)); + + let moon = Path::new(|path| { + path.circle(Point::ORIGIN, Self::MOON_RADIUS) + }); + + frame.fill(&moon, Fill::Color(Color::WHITE)); + }); + + frame.fill( + &shadow, + Fill::Color(Color { + a: 0.7, + ..Color::BLACK + }), + ); + }); + } +} + +mod time { + use iced::futures; + use std::time::Instant; + + pub fn every(duration: std::time::Duration) -> iced::Subscription<Instant> { + iced::Subscription::from_recipe(Every(duration)) + } + + struct Every(std::time::Duration); + + impl<H, I> iced_native::subscription::Recipe<H, I> for Every + where + H: std::hash::Hasher, + { + type Output = Instant; + + fn hash(&self, state: &mut H) { + use std::hash::Hash; + + std::any::TypeId::of::<Self>().hash(state); + self.0.hash(state); + } + + fn stream( + self: Box<Self>, + _input: futures::stream::BoxStream<'static, I>, + ) -> futures::stream::BoxStream<'static, Self::Output> { + use futures::stream::StreamExt; + + async_std::stream::interval(self.0) + .map(|_| Instant::now()) + .boxed() + } + } +} |