woocraft 0.4.5

GPUI components lib for Woocraft design system.
Documentation 
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// @reference: https://d3js.org/d3-shape/pie

use std::f32::consts::TAU;

use super::arc::ArcData;

#[allow(clippy::type_complexity)]
pub struct Pie<T> {
  value: Box<dyn Fn(&T) -> Option<f32>>,
  start_angle: f32,
  end_angle: f32,
  pad_angle: f32,
}

impl<T> Default for Pie<T> {
  fn default() -> Self {
    Self {
      value: Box::new(|_| None),
      start_angle: 0.,
      end_angle: TAU,
      pad_angle: 0.,
    }
  }
}

impl<T> Pie<T> {
  pub fn new() -> Self {
    Self::default()
  }

  /// Set the value of the Pie.
  pub fn value<F>(mut self, value: F) -> Self
  where
    F: 'static + Fn(&T) -> Option<f32>, {
    self.value = Box::new(value);
    self
  }

  /// Set the start angle of the Pie.
  pub fn start_angle(mut self, start_angle: f32) -> Self {
    self.start_angle = start_angle;
    self
  }

  /// Set the end angle of the Pie.
  pub fn end_angle(mut self, end_angle: f32) -> Self {
    self.end_angle = end_angle;
    self
  }

  /// Set the pad angle of the Pie.
  pub fn pad_angle(mut self, pad_angle: f32) -> Self {
    self.pad_angle = pad_angle;
    self
  }

  /// Get the arcs of the Pie.
  pub fn arcs<'a>(&self, data: &'a [T]) -> Vec<ArcData<'a, T>> {
    let mut values = Vec::new();
    let mut sum = 0.;

    for (idx, v) in data.iter().enumerate() {
      if let Some(value) = (self.value)(v)
        && value > 0.
      {
        sum += value;
        values.push((idx, v, value));
      }
    }

    let mut arcs = Vec::with_capacity(values.len());
    let mut k = self.start_angle;

    for (index, v, value) in values {
      let start_angle = k;
      let angle_delta = if sum > 0. {
        (value / sum) * (self.end_angle - self.start_angle)
      } else {
        0.
      };
      k += angle_delta;
      let end_angle = k;

      arcs.push(ArcData {
        data: v,
        index,
        value,
        start_angle,
        end_angle,
        pad_angle: self.pad_angle,
      });
    }

    arcs
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn test_pie() {
    let pie = Pie::new().value(|v| Some(*v));

    let data = vec![1., 1., 1.];
    let arcs = pie.arcs(&data);

    assert_eq!(arcs.len(), 3);

    assert_eq!(arcs[0].value, 1.);
    assert_eq!(arcs[1].value, 1.);
    assert_eq!(arcs[2].value, 1.);

    assert_eq!(arcs[0].start_angle, 0.);
    assert_eq!(arcs[0].end_angle, arcs[1].start_angle);
    assert_eq!(arcs[1].end_angle, arcs[2].start_angle);
    assert_eq!(arcs[2].end_angle, TAU);
  }

  #[test]
  fn test_pie_zero_values() {
    let pie = Pie::new().value(|v| Some(*v));
    let data = vec![0., 1., 0., 2.];
    let arcs = pie.arcs(&data);

    assert_eq!(arcs.len(), 2);
    assert_eq!(arcs[0].value, 1.);
    assert_eq!(arcs[1].value, 2.);
    assert_eq!(arcs[0].index, 1);
    assert_eq!(arcs[1].index, 3);
  }
}