Struct IceDrip 

pub struct IceDrip { /* private fields */ }

Ice-drip decor — a row of icicles along the top edge of a rect with melt-droplets that fall under gravity, fade out, and recur, plus a faint frost shimmer along the edge. The signature decor of the Skaði “Skade Vinter” winter scene (pairs with crate::look::Theme::skade_vinter).

Pure CPU — layered alpha shapes on an egui::Painter, no GPU/backend risk — time-driven and deterministic given (seed, clock), so it is headless- testable exactly like ParticleBurst / RavenSprite. It is off unless enabled (the gate); paint_gated also follows the active theme’s EffectsPolicy so it stays dark under Reduced/None/Device.

let mut drip = IceDrip::new(12, 0).enabled(true);
drip.set_clock(ui.input(|i| i.time));   // time-driven
drip.paint_gated(ui, ui.max_rect());    // honours EffectsPolicy

Implementations

impl IceDrip

pub fn new(count: usize, seed: u64) -> Self

count icicles across the top edge, jittered deterministically by seed (SplitMix64 — no RNG crate). Default icy palette; disabled by default (the gate) — call enabled(true) to turn it on.

pub fn enabled(self, on: bool) -> Self

Turn the decor on/off (the gate). Builder form.

pub fn colors(self, ice: Color32, glow: Color32) -> Self

Override the icicle + frost colours.

pub fn with_period(self, secs: f32) -> Self

Drip cycle length in seconds (one droplet per cycle). Builder form.

pub fn at_clock(self, secs: f32) -> Self

Pin the clock up front (builder form of set_clock) — the testable, deterministic entry point.

pub fn set_clock(&mut self, secs: f32)

Set the absolute scene time (drive from ui.input(|i| i.time)).

pub fn update(&mut self, dt: f32)

Advance the scene time by dt seconds.

pub fn is_enabled(&self) -> bool

Is the decor on?

pub fn paint(&self, painter: &Painter, rect: Rect)

Paint the icicles + falling melt-droplets + frost shimmer onto painter, hanging from the top edge of rect. No-op unless enabled.

pub fn paint_gated(&self, ui: &Ui, rect: Rect)

Paint only if the active theme’s EffectsPolicy allows decorative motion (i.e. Full) — so the decor follows the theme (dark under Reduced/None/Device) on top of its own enabled gate. Reads the policy published by crate::look::Theme::apply.

pub fn state_json(&self) -> Value

Observable state for headless / robot tests (the state_json hook): the gate, the icicle count, the live droplets (each x + normalised fall + alpha), the frost phase, and the clock. Asserted as DATA, not pixels.

Trait Implementations

impl Clone for IceDrip

fn clone(&self) -> IceDrip

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.