Struct BoulderDustState 

pub struct BoulderDustState { /* private fields */ }

The 2×2 smoke-puff block kicked up when a pushed boulder slides one tile. The block is written once, anchored to the player’s map tile at push time (the animation outlives the push lockout, so the anchor must not track the player afterward), then runs BOULDER_DUST_STEPS steps of BOULDER_DUST_STEP_FRAMES frames each. Every step the block drifts 1px against the boulder’s slide direction and the sprite palette toggles, flashing two gray shades.

Implementations

impl BoulderDustState

pub const fn inactive() -> Self

A finished (inactive) state — no dust showing.

pub const fn new(facing: Direction, anchor_x: u16, anchor_y: u16) -> Self

Start the dust for a push in facing direction, anchored to the player’s map tile at push time.

pub fn tick(&mut self)

Advance one frame. No-op once the animation has finished.

pub fn is_active(&self) -> bool

True while the puff is showing (steps 0..7).

pub fn facing(&self) -> Direction

The push direction.

pub fn anchor(&self) -> (u16, u16)

The player’s map tile at push time — the dust’s world anchor.

pub fn step(&self) -> u8

Current animation step index (0..=7).

pub fn base_offset(&self) -> (i32, i32)

Base pixel offset of the dust block’s top-left corner from the player sprite’s top-left (the puff appears at the boulder’s base, “2 blocks away from the player”).

pub fn drift_px(&self) -> (i32, i32)

Per-step pixel drift of the dust block — opposite to the boulder’s slide direction. The puff lingers as the boulder slides away from it.

pub fn tile_drifts(&self) -> [(i32, i32); 4]

Per-step pixel delta of each of the block’s four 8×8 tiles (upper-left, upper-right, lower-left, lower-right). Vertical pushes move the whole block; horizontal pushes move only the upper-right, lower-left and lower-right tiles — the upper-left tile stays in place.

pub fn palette_flipped(&self) -> bool

True on odd steps: the palette toggles once per step, flashing the two gray shades of the smoke sprite.

Trait Implementations

impl Clone for BoulderDustState

fn clone(&self) -> BoulderDustState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BoulderDustState

impl Debug for BoulderDustState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for BoulderDustState

impl PartialEq for BoulderDustState

fn eq(&self, other: &BoulderDustState) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BoulderDustState