ggplot-rs 0.2.0

A Rust implementation of ggplot2's Grammar of Graphics
Documentation 
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use rand::Rng;

use crate::data::{DataFrame, Value};

use super::{Position, PositionParams};

/// Add random noise to x and y positions to reduce overplotting.
pub struct PositionJitter {
    pub width: f64,
    pub height: f64,
}

impl Default for PositionJitter {
    fn default() -> Self {
        PositionJitter {
            width: 0.4,
            height: 0.4,
        }
    }
}

impl Position for PositionJitter {
    fn compute(&self, data: &mut DataFrame, _params: &PositionParams) {
        let mut rng = rand::thread_rng();

        if let Some(x_col) = data.column_mut("x") {
            for v in x_col.iter_mut() {
                if let Some(x) = v.as_f64() {
                    let jitter = rng.gen_range(-self.width..self.width);
                    *v = Value::Float(x + jitter);
                }
            }
        }

        if self.height > 0.0 {
            if let Some(y_col) = data.column_mut("y") {
                for v in y_col.iter_mut() {
                    if let Some(y) = v.as_f64() {
                        let jitter = rng.gen_range(-self.height..self.height);
                        *v = Value::Float(y + jitter);
                    }
                }
            }
        }
    }

    fn name(&self) -> &str {
        "jitter"
    }
}