OXYGENHUB
# 317d776c725b oxygenhub / crates / backdrop / src / scene.rs
2.2 KiB · Rust · last changed Live arrivals on the sky 22 days ago source blame history raw
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//! A backdrop's scene (docs/backgrounds.md §2): what it draws and how it
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//! moves. The engine (lib.rs) drives any of them the same way.
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use crate::sky::{Colours, Kind};
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pub trait Scene {
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    /// The view is now `w` by `h` CSS pixels, the page's content column
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    /// between `avoid`'s left and right.
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    fn resize(&mut self, w: f32, h: f32, avoid: Option<(f32, f32)>);
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    /// The cursor moved to `(x, y)`, or left the page.
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    fn point(&mut self, at: Option<(f32, f32)>);
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    /// Move on by `dt` seconds.
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    fn step(&mut self, dt: f32);
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    /// The marks, 8 floats each (sky::Sky::instances).
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    fn instances(&self, c: &Colours, out: &mut Vec<f32>);
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    /// The links, 12 floats each (sky::Sky::links).
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    fn links(&self, c: &Colours, out: &mut Vec<f32>);
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    /// The name a resting cursor shows, and where.
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    fn label(&self) -> Option<(&str, f32, f32)>;
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    /// New activity in repository `repo` (§5, "Live"); only the sky shows it.
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    fn arrive(&mut self, _repo: &str, _kind: Kind, _n: u32) {}
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    /// Whether a frame would show anything new besides the drift, which
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    /// the engine stops drawing a while after the last input (§6).
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    fn busy(&self) -> bool;
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    fn still(&self) -> bool;
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    fn size(&self) -> (f32, f32);
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}
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impl Scene for crate::sky::Sky {
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    fn resize(&mut self, w: f32, h: f32, avoid: Option<(f32, f32)>) {
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        crate::sky::Sky::resize(self, w, h, avoid)
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    }
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    fn point(&mut self, at: Option<(f32, f32)>) {
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        crate::sky::Sky::point(self, at)
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    }
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    fn step(&mut self, dt: f32) {
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        crate::sky::Sky::step(self, dt)
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    }
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    fn instances(&self, c: &Colours, out: &mut Vec<f32>) {
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        crate::sky::Sky::instances(self, c, out)
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    }
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    fn links(&self, c: &Colours, out: &mut Vec<f32>) {
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        crate::sky::Sky::links(self, c, out)
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    }
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    fn label(&self) -> Option<(&str, f32, f32)> {
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        crate::sky::Sky::label(self)
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    }
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    fn arrive(&mut self, repo: &str, kind: Kind, n: u32) {
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        crate::sky::Sky::arrive(self, repo, kind, n)
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    }
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    fn busy(&self) -> bool {
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        crate::sky::Sky::busy(self)
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    }
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    fn still(&self) -> bool {
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        self.still
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    }
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    fn size(&self) -> (f32, f32) {
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        (self.w, self.h)
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    }
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}