charton 0.4.1

A high-level, layered charting system for Rust, designed for Polars-first data workflows and multi-backend rendering.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

use charton::prelude::*;
use polars::prelude::*;
use std::error::Error;

#[test]
fn test_transform_calculate_1() -> Result<(), Box<dyn Error>> {
    // Create sample data with x and y values
    let df = df! [
        "type" => ["a", "b", "c", "d"],
        //"type" => [1.0, 2.5, 3.0, 4.1],
        "value" => [5.1, 5.3, 5.7, 6.5],
        "value_std" => [0.2, 0.23, 0.14, 0.25]
    ]?;

    // Create error bar chart using transform_calculate to add min/max values
    let errorbar_chart = Chart::build(&df)?
        // Use transform_calculate to create ymin and ymax columns based on fixed std values
        .transform_calculate(
            (col("value") - col("value_std")).alias("value_min"), // ymin = y - std
            (col("value") + col("value_std")).alias("value_max"), // ymax = y + std
        )?
        .mark_errorbar()?
        .encode((x("type"), y("value_min"), y2("value_max")))?
        .configure_errorbar(
            |e| {
                e.with_color("blue")
                    .with_stroke_width(2.0)
                    .with_cap_length(5.0)
                    .with_center(true)
            }, // Show center point
        );
    errorbar_chart
        .with_size(500, 400)
        .with_title("Error Bar Chart with Mean and Std Dev")
        .coord_flip()
        .save("./tests/transform_calculate_1.svg")?;

    Ok(())
}