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use crate::axis::Tick;
use crate::private::SealedScale;
pub trait Scale: SealedScale {}
#[derive(Clone, Debug)]
pub struct Numeric {
start: f32,
stop: f32,
tick_spacing: f32,
}
impl Default for Numeric {
fn default() -> Self {
Self::new(0.0, 1.0)
}
}
impl Numeric {
pub fn new(min: f32, max: f32) -> Self {
let tick_spacing = Self::spacing(min, max);
let start = (min / tick_spacing).floor() * tick_spacing;
let stop = (max / tick_spacing).ceil() * tick_spacing;
Self {
start,
stop,
tick_spacing,
}
}
fn spacing(min: f32, max: f32) -> f32 {
let span = max - min;
let power = span.log10().floor() as i32;
let spc = 10_f32.powi(power);
let start = (min / spc).floor() * spc;
let stop = (max / spc).ceil() * spc;
let steps = (stop - start) / spc;
if steps <= 1.0 {
spc / 10.0
} else if steps <= 2.0 {
spc / 4.0
} else if steps < 5.0 {
spc / 2.0
} else {
spc
}
}
pub fn tick_spacing(&self) -> f32 {
self.tick_spacing
}
fn add_tick(&self, val: f32, ticks: &mut Vec<Tick>) {
let value = self.normalize(val);
let text = format!("{}", val);
let tick = Tick::new(value, text);
ticks.push(tick);
}
}
impl Scale for Numeric {}
impl SealedScale for Numeric {
fn from_data<'a, I, P>(data: I, get: fn(&P) -> f32) -> Self
where
I: IntoIterator<Item = &'a P>,
P: 'a,
{
let mut it = data.into_iter();
if let Some(pt) = it.next() {
let mut min = get(pt);
let mut max = min;
for pt in it {
let x = get(pt);
if x < min {
min = x;
}
if x > max {
max = x;
}
}
Numeric::new(min, max)
} else {
Numeric::default()
}
}
fn union(&self, rhs: Self) -> Self {
let min = self.start.min(rhs.start);
let max = self.stop.max(rhs.stop);
Numeric::new(min, max)
}
fn inverted(&self) -> Self {
Numeric {
start: self.start,
stop: self.stop,
tick_spacing: -self.tick_spacing,
}
}
fn normalize(&self, value: f32) -> f32 {
let a = self.start;
let b = self.stop;
if b - a > f32::EPSILON {
if self.tick_spacing() > 0.0 {
(value - a) / (b - a)
} else {
(b - value) / (b - a)
}
} else {
0.5
}
}
fn ticks(&self) -> Vec<Tick> {
let mut ticks = vec![];
let spacing = self.tick_spacing();
if spacing > 0.0 {
let mut val = self.start;
while val <= self.stop {
self.add_tick(val, &mut ticks);
val += spacing;
}
} else {
let mut val = self.stop;
while val >= self.start {
self.add_tick(val, &mut ticks);
val += spacing;
}
};
ticks
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
assert_eq!(Numeric::new(0.0, 10.0).tick_spacing(), 1.0);
assert_eq!(Numeric::new(9.5, 10.0).tick_spacing(), 0.1);
assert_eq!(Numeric::new(0.0, 25.0).tick_spacing(), 5.0);
assert_eq!(Numeric::new(0.0, 30.0).tick_spacing(), 5.0);
assert_eq!(Numeric::new(0.0, 40.0).tick_spacing(), 5.0);
assert_eq!(Numeric::new(0.0, 50.0).tick_spacing(), 10.0);
assert_eq!(Numeric::new(0.0, 75.0).tick_spacing(), 10.0);
assert_eq!(Numeric::new(0.0, 100.0).tick_spacing(), 10.0);
assert_eq!(Numeric::new(0.0, 1.0).tick_spacing(), 0.1);
assert_eq!(Numeric::new(0.0, 1.5).tick_spacing(), 0.25);
assert_eq!(Numeric::new(0.0, 2.0).tick_spacing(), 0.25);
assert_eq!(Numeric::new(0.0, 0.1).tick_spacing(), 0.01);
assert_eq!(Numeric::new(0.0, 0.1).tick_spacing(), 0.01);
}
}