use metfor::{HectoPascal, Knots, Quantity, WindSpdDir, WindUV};
use optional::{none, Optioned};
use sounding_base::{DataRow, Sounding};
use std::ops::Sub;
use crate::error::AnalysisError::*;
use crate::error::*;
pub fn linear_interpolate_sounding(snd: &Sounding, tgt_p: HectoPascal) -> Result<DataRow> {
let pressure: &[Optioned<HectoPascal>] = snd.pressure_profile();
let temperature = snd.temperature_profile();
let wet_bulb = snd.wet_bulb_profile();
let dew_point = snd.dew_point_profile();
let theta_e = snd.theta_e_profile();
let wind = snd.wind_profile();
let omega = snd.pvv_profile();
let height = snd.height_profile();
let cloud_fraction = snd.cloud_fraction_profile();
let mut result = DataRow::default();
result.pressure = Optioned::from(tgt_p);
let mut below_idx: usize = 0;
let mut above_idx: usize = 0;
let mut found_bottom: bool = false;
for (i, p) in pressure.iter().enumerate() {
if let Some(p) = p.into_option() {
if p > tgt_p {
below_idx = i;
found_bottom = true;
} else if p < tgt_p && found_bottom {
above_idx = i;
break;
} else if (p - tgt_p).unpack().abs() <= ::std::f64::EPSILON {
return snd.data_row(i).ok_or(AnalysisError::InvalidInput);
} else {
break; }
}
}
if above_idx != 0 {
let p_below = pressure[below_idx].unwrap();
let p_above = pressure[above_idx].unwrap();
let run = p_above - p_below;
let dp = tgt_p - p_below;
result.temperature = eval_linear_interp(below_idx, above_idx, run, dp, temperature);
result.wet_bulb = eval_linear_interp(below_idx, above_idx, run, dp, wet_bulb);
result.dew_point = eval_linear_interp(below_idx, above_idx, run, dp, dew_point);
result.theta_e = eval_linear_interp(below_idx, above_idx, run, dp, theta_e);
if wind.len() > above_idx {
if let (Some(w_below), Some(w_above)) =
(wind[below_idx].into_option(), wind[above_idx].into_option())
{
let WindUV::<Knots> {
u: x_below,
v: y_below,
} = WindUV::from(w_below);
let WindUV::<Knots> {
u: x_above,
v: y_above,
} = WindUV::from(w_above);
let dp = dp.unpack();
let run = run.unpack();
let rise_x = x_above - x_below;
let rise_y = y_above - y_below;
let x = x_below + rise_x * (dp / run);
let y = y_below + rise_y * (dp / run);
let interped_wind = WindSpdDir::from(WindUV { u: x, v: y });
result.wind = interped_wind.into();
}
}
result.pvv = eval_linear_interp(below_idx, above_idx, run, dp, omega);
result.height = eval_linear_interp(below_idx, above_idx, run, dp, height);
result.cloud_fraction = eval_linear_interp(below_idx, above_idx, run, dp, cloud_fraction);
Ok(result)
} else {
Err(InvalidInput)
}
}
#[inline]
pub fn linear_interpolate<X, Y>(xs: &[Optioned<X>], ys: &[Optioned<Y>], target_x: X) -> Optioned<Y>
where
X: Quantity + optional::Noned + PartialOrd + Sub<X>,
<X as Sub<X>>::Output: Quantity + optional::Noned,
Y: Quantity + optional::Noned,
{
debug_assert_eq!(xs.len(), ys.len());
let mut below_idx: usize = 0;
let mut above_idx: usize = 0;
let mut found_bottom: bool = false;
for (i, x) in xs.iter().enumerate() {
if x.is_some() {
let x = x.unpack();
if x > target_x {
below_idx = i;
found_bottom = true;
} else if x < target_x && found_bottom {
above_idx = i;
break;
} else if (x - target_x).unpack().abs() <= ::std::f64::EPSILON {
return ys[i];
} else {
break; }
}
}
if above_idx != 0 {
let x_below = xs[below_idx].unwrap();
let x_above = xs[above_idx].unwrap();
let run = x_above - x_below;
let dx = target_x - x_below;
eval_linear_interp(below_idx, above_idx, run, dx, ys)
} else {
none()
}
}
#[inline]
fn eval_linear_interp<QX, QY>(
blw_idx: usize,
abv_idx: usize,
run: QX,
dp: QX,
array: &[Optioned<QY>],
) -> Optioned<QY>
where
QX: Quantity + optional::Noned,
QY: Quantity + optional::Noned,
{
if array.len() > abv_idx {
if array[blw_idx].is_some() && array[abv_idx].is_some() {
let (val_below, val_above) = (
array[blw_idx].unpack().unpack(),
array[abv_idx].unpack().unpack(),
);
let rise: f64 = (val_above - val_below).unpack();
let run: f64 = run.unpack();
let dp: f64 = dp.unpack();
Optioned::from(QY::pack(val_below + dp * rise / run))
} else {
Optioned::default()
}
} else {
Optioned::default()
}
}
#[inline]
pub(crate) fn linear_interp<X, Y>(x_val: X, x1: X, x2: X, y1: Y, y2: Y) -> Y
where
X: Sub<X> + Copy,
<X as Sub<X>>::Output: Quantity,
Y: Quantity + Sub<Y>,
<Y as Sub<Y>>::Output: Quantity,
{
let run = (x2 - x1).unpack();
let rise = (y2 - y1).unpack();
let dx = (x_val - x1).unpack();
Y::pack(y1.unpack() + dx * (rise / run))
}