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|
use crate::utils;
fn compute_reverse(frames: u64, tick: u64, start: u64) -> u64 {
let leftover = frames - (tick - start)
.clamp(0, frames);
tick - leftover
}
pub enum ModeToggle {
Inactive { start: u64 },
Active { start: u64 },
}
pub struct Mode {
frames: u64,
toggle: ModeToggle,
locked: bool,
}
impl Mode {
pub fn new(frames: u64) -> Self {
Self {
frames,
toggle: ModeToggle::Inactive { start: 0 },
locked: false,
}
}
/// Is the current state active?
pub fn is_active(&self) -> bool {
match self.toggle {
ModeToggle::Inactive {..} => false,
ModeToggle::Active {..} => true,
}
}
pub fn is_locked(&self) -> bool {
self.locked
}
/// Has the current transition finished?
pub fn is_ready(&self, tick: u64) -> bool {
let started = match self.toggle {
ModeToggle::Inactive { start } => start,
ModeToggle::Active { start } => start,
};
tick - started > self.frames
}
pub fn progress(&self, tick: u64) -> f32 {
match self.toggle {
ModeToggle::Inactive { start } => {
1.0 - (((tick - start) as f32) / self.frames as f32)
.clamp(0.0, 1.0)
},
ModeToggle::Active { start } => {
(((tick - start) as f32) / self.frames as f32)
.clamp(0.0, 1.0)
}
}
}
pub fn reset(&mut self) {
self.locked = false;
self.toggle = ModeToggle::Inactive { start: 0 };
}
pub fn reverse(&mut self, tick: u64) -> bool {
if !self.locked {
self.locked = true;
match self.toggle {
ModeToggle::Inactive { start } => {
self.toggle = ModeToggle::Active {
start: compute_reverse(self.frames, tick, start)
};
},
ModeToggle::Active { start } => {
self.toggle = ModeToggle::Inactive {
start: compute_reverse(self.frames, tick, start)
};
},
}
true
} else { false }
}
pub fn lock(&mut self) {
self.locked = true;
}
pub fn unlock(&mut self) {
self.locked = false;
}
}
pub struct Cursor {
pub index: i32,
pub prev_index: i32,
pub change_started: u64,
pub bound: i32,
pub frames: u64,
pub locked: bool,
}
impl Cursor {
pub fn new(bound: i32, frames: u64) -> Self {
Self {
index: 0,
prev_index: 0,
change_started: 0,
bound,
frames,
locked: false,
}
}
pub fn animation_index(&self, tick: u64) -> f32 {
let progress = ((tick - self.change_started) as f32)
/ (self.frames as f32 / 2.0);
utils::lerp(
self.prev_index as f32,
self.index as f32,
progress
)
}
pub fn is_ready(&self, tick: u64) -> bool {
tick - self.change_started > self.frames
}
pub fn set(&mut self, val: i32, tick: u64) -> bool {
if self.is_ready(tick) || !self.locked {
self.change_started = tick;
self.prev_index = self.index;
self.index = val;
self.index %= self.bound;
self.locked = true;
true
} else { false }
}
pub fn increment(&mut self, tick: u64) -> bool {
self.set(self.index + 1, tick)
}
pub fn decrement(&mut self, tick: u64) -> bool {
self.set(self.index + self.bound - 1, tick)
}
pub fn unlock(&mut self) {
self.locked = false;
}
}
|
