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use crate::coord::ranged1d::{
AsRangedCoord, DefaultFormatting, DiscreteRanged, KeyPointHint, Ranged,
};
use std::ops::Range;
/// This axis decorator will make the axis partially display on the axis.
/// At some time, we want the axis only covers some part of the value.
/// This decorator will have an additional display range defined.
#[derive(Clone)]
pub struct PartialAxis<R: Ranged>(R, Range<R::ValueType>);
/// The trait for the types that can be converted into a partial axis
pub trait IntoPartialAxis: AsRangedCoord {
/// Make the partial axis
///
/// - `axis_range`: The range of the axis to be displayed
/// - **returns**: The converted range specification
fn partial_axis(
self,
axis_range: Range<<Self::CoordDescType as Ranged>::ValueType>,
) -> PartialAxis<Self::CoordDescType> {
PartialAxis(self.into(), axis_range)
}
}
impl<R: AsRangedCoord> IntoPartialAxis for R {}
impl<R: Ranged> Ranged for PartialAxis<R>
where
R::ValueType: Clone,
{
type FormatOption = DefaultFormatting;
type ValueType = R::ValueType;
fn map(&self, value: &Self::ValueType, limit: (i32, i32)) -> i32 {
self.0.map(value, limit)
}
fn key_points<Hint: KeyPointHint>(&self, hint: Hint) -> Vec<Self::ValueType> {
self.0.key_points(hint)
}
fn range(&self) -> Range<Self::ValueType> {
self.0.range()
}
fn axis_pixel_range(&self, limit: (i32, i32)) -> Range<i32> {
let left = self.map(&self.1.start, limit);
let right = self.map(&self.1.end, limit);
left.min(right)..left.max(right)
}
}
impl<R: DiscreteRanged> DiscreteRanged for PartialAxis<R>
where
R: Ranged,
<R as Ranged>::ValueType: Eq + Clone,
{
fn size(&self) -> usize {
self.0.size()
}
fn index_of(&self, value: &R::ValueType) -> Option<usize> {
self.0.index_of(value)
}
fn from_index(&self, index: usize) -> Option<Self::ValueType> {
self.0.from_index(index)
}
}
/// Make a partial axis based on the percentage of visible portion.
/// We can use `into_partial_axis` to create a partial axis range specification.
/// But sometimes, we want to directly specify the percentage visible to the user.
///
/// - `axis_range`: The range specification
/// - `part`: The visible part of the axis. Each value is from [0.0, 1.0]
/// - **returns**: The partial axis created from the input, or `None` when not possible
pub fn make_partial_axis<T>(
axis_range: Range<T>,
part: Range<f64>,
) -> Option<PartialAxis<<Range<T> as AsRangedCoord>::CoordDescType>>
where
Range<T>: AsRangedCoord,
T: num_traits::NumCast + Clone,
{
let left: f64 = num_traits::cast(axis_range.start.clone())?;
let right: f64 = num_traits::cast(axis_range.end.clone())?;
let full_range_size = (right - left) / (part.end - part.start);
let full_left = left - full_range_size * part.start;
let full_right = right + full_range_size * (1.0 - part.end);
let full_range: Range<T> = num_traits::cast(full_left)?..num_traits::cast(full_right)?;
let axis_range: <Range<T> as AsRangedCoord>::CoordDescType = axis_range.into();
Some(PartialAxis(full_range.into(), axis_range.range()))
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_make_partial_axis() {
let r = make_partial_axis(20..80, 0.2..0.8).unwrap();
assert_eq!(r.size(), 101);
assert_eq!(r.range(), 0..100);
assert_eq!(r.axis_pixel_range((0, 100)), 20..80);
}
}
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