diff options
Diffstat (limited to 'examples/solar_system/src/main.rs')
| -rw-r--r-- | examples/solar_system/src/main.rs | 158 |
1 files changed, 64 insertions, 94 deletions
diff --git a/examples/solar_system/src/main.rs b/examples/solar_system/src/main.rs index 9337c7b5..e2f107bd 100644 --- a/examples/solar_system/src/main.rs +++ b/examples/solar_system/src/main.rs @@ -81,6 +81,12 @@ struct State { } 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) = window::Settings::default().size; @@ -95,17 +101,6 @@ impl State { } } - pub fn space(&self) -> Space<'_> { - Space { stars: &self.stars } - } - - pub fn system(&self) -> System { - System { - start: self.start, - now: self.now, - } - } - pub fn update(&mut self, now: Instant) { self.now = now; self.system_cache.clear(); @@ -136,106 +131,81 @@ impl State { } } -impl<Message> canvas::State<Message> for State { +impl<Message> canvas::Program<Message> for State { fn draw(&self, bounds: Size) -> Vec<canvas::Geometry> { - vec![ - self.space_cache.draw(bounds, self.space()), - self.system_cache.draw(bounds, self.system()), - ] - } -} + use canvas::{Path, Stroke}; + use std::f32::consts::PI; -#[derive(Debug)] -struct Space<'a> { - stars: &'a [(Point, f32)], -} + let background = self.space_cache.draw(bounds, |frame| { + let space = Path::rectangle(Point::new(0.0, 0.0), frame.size()); -impl canvas::Drawable for Space<'_> { - fn draw(&self, frame: &mut canvas::Frame) { - use canvas::Path; + let stars = Path::new(|path| { + for (p, size) in &self.stars { + path.rectangle(*p, Size::new(*size, *size)); + } + }); - let space = Path::rectangle(Point::new(0.0, 0.0), frame.size()); + frame.fill(&space, Color::BLACK); - let stars = Path::new(|path| { - for (p, size) in self.stars { - path.rectangle(*p, Size::new(*size, *size)); - } + frame.translate(frame.center() - Point::ORIGIN); + frame.fill(&stars, Color::WHITE); }); - frame.fill(&space, Color::BLACK); + let system = self.system_cache.draw(bounds, |frame| { + let center = frame.center(); - frame.translate(frame.center() - Point::ORIGIN); - frame.fill(&stars, Color::WHITE); - } -} + let sun = Path::circle(center, Self::SUN_RADIUS); + let orbit = Path::circle(center, Self::ORBIT_RADIUS); -#[derive(Debug)] -struct System { - start: Instant, - now: Instant, -} - -impl System { - 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; -} - -impl canvas::Drawable for System { - fn draw(&self, frame: &mut canvas::Frame) { - use canvas::{Path, Stroke}; - use std::f32::consts::PI; - - let center = frame.center(); - - let sun = Path::circle(center, Self::SUN_RADIUS); - let orbit = Path::circle(center, Self::ORBIT_RADIUS); - - frame.fill(&sun, Color::from_rgb8(0xF9, 0xD7, 0x1C)); - frame.stroke( - &orbit, - Stroke { - width: 1.0, - color: Color::from_rgba8(0, 153, 255, 0.1), - ..Stroke::default() - }, - ); + frame.fill(&sun, 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.now - self.start; - let rotation = (2.0 * PI / 60.0) * elapsed.as_secs() as f32 - + (2.0 * PI / 60_000.0) * elapsed.subsec_millis() as f32; + let elapsed = self.now - self.start; + let rotation = (2.0 * PI / 60.0) * elapsed.as_secs() as f32 + + (2.0 * PI / 60_000.0) * elapsed.subsec_millis() as f32; - frame.with_save(|frame| { - frame.translate(Vector::new(center.x, center.y)); - frame.rotate(rotation); - frame.translate(Vector::new(Self::ORBIT_RADIUS, 0.0)); + frame.with_save(|frame| { + frame.translate(Vector::new(center.x, center.y)); + frame.rotate(rotation); + frame.translate(Vector::new(Self::ORBIT_RADIUS, 0.0)); + + let earth = Path::circle(Point::ORIGIN, Self::EARTH_RADIUS); + let shadow = Path::rectangle( + Point::new(0.0, -Self::EARTH_RADIUS), + Size::new( + Self::EARTH_RADIUS * 4.0, + Self::EARTH_RADIUS * 2.0, + ), + ); - let earth = Path::circle(Point::ORIGIN, Self::EARTH_RADIUS); - let shadow = Path::rectangle( - Point::new(0.0, -Self::EARTH_RADIUS), - Size::new(Self::EARTH_RADIUS * 4.0, Self::EARTH_RADIUS * 2.0), - ); + frame.fill(&earth, Color::from_rgb8(0x6B, 0x93, 0xD6)); - frame.fill(&earth, Color::from_rgb8(0x6B, 0x93, 0xD6)); + frame.with_save(|frame| { + frame.rotate(rotation * 10.0); + frame.translate(Vector::new(0.0, Self::MOON_DISTANCE)); - frame.with_save(|frame| { - frame.rotate(rotation * 10.0); - frame.translate(Vector::new(0.0, Self::MOON_DISTANCE)); + let moon = Path::circle(Point::ORIGIN, Self::MOON_RADIUS); + frame.fill(&moon, Color::WHITE); + }); - let moon = Path::circle(Point::ORIGIN, Self::MOON_RADIUS); - frame.fill(&moon, Color::WHITE); + frame.fill( + &shadow, + Color { + a: 0.7, + ..Color::BLACK + }, + ); }); - - frame.fill( - &shadow, - Color { - a: 0.7, - ..Color::BLACK - }, - ); }); + + vec![background, system] } } |