charts-rs

charts-rs is a charting library for rust. It's simple and fast.

Overview

charts-rs provides a straightforward approach to generating charts with support for multiple output formats including svg, png, jpeg, webp, and avif. The library offers nine distinct themes: light, dark, grafana, ant, vintage, walden, westeros, chalk, and shine, with light as the default theme.

The library supports twelve chart types: Bar, HorizontalBar, Line, Pie, Radar, Scatter, Candlestick, Table, Heatmap, MultiChart, Calendar, and Gauge. Drawing inspiration from Apache ECharts, charts-rs enables developers to create charts with similar functionality and appearance.

Themes

themes

Features

Nine built-in themes available for all chart types
Custom font loading from ttf or otf files
Advanced line chart features: smooth curves, area filling, mark points and mark lines
Multiple legend styles across all charts: round rect, circle, and rect
Dual y-axis support for enhanced data visualization
Logarithmic scale support ("log", "log2", or {"type":"log","base":N})
Gradient fill support for bars, areas, and pie slices (LinearGradient)
JSON-based chart configuration for simplified setup
Multiple output formats (svg, png, jpeg, webp, avif) for various use cases
Scaled image export via svg_to_png_with_size and equivalent functions for other formats
Web-based JSON editor for interactive chart configuration and testing

Demo

You can try to use the web demo page, it's simple and useful.

Charts Web Demo Page: https://charts.npmtrend.com/

Charts Web Source: https://github.com/vicanso/charts-rs-web

Mix line bar

Horizontal bar

Line

Pie

Radar

Scatter

Candlestick

Table

Heatmap

Multi Chart

Example

New from option

use charts_rs::{
    BarChart, Box, SeriesCategory, THEME_GRAFANA
};
let mut bar_chart = BarChart::new_with_theme(
    vec![
        ("Evaporation", vec![2.0, 4.9, 7.0, 23.2, 25.6, 76.7, 135.6]).into(),
        (
            "Precipitation",
            vec![2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6],
        )
            .into(),
        ("Temperature", vec![2.0, 2.2, 3.3, 4.5, 6.3, 10.2, 20.3]).into(),
    ],
    vec![
        "Mon".to_string(),
        "Tue".to_string(),
        "Wed".to_string(),
        "Thu".to_string(),
        "Fri".to_string(),
        "Sat".to_string(),
        "Sun".to_string(),
    ],
    THEME_GRAFANA,
);
bar_chart.title_text = "Mixed Line and Bar".to_string();
bar_chart.legend_margin = Some(Box {
    top: bar_chart.title_height,
    bottom: 5.0,
    ..Default::default()
});
bar_chart.series_list[2].category = Some(SeriesCategory::Line);
bar_chart.series_list[2].y_axis_index = 1;
bar_chart.series_list[2].label_show = true;

bar_chart
    .y_axis_configs
    .push(bar_chart.y_axis_configs[0].clone());
bar_chart.y_axis_configs[0].axis_formatter = Some("{c} ml".to_string());
bar_chart.y_axis_configs[1].axis_formatter = Some("{c} °C".to_string());

println!("{}", &bar_chart.svg().unwrap());
svg_to_png(&bar_chart.svg().unwrap()).unwrap();

From json

use charts_rs::{BarChart, svg_to_png};
let bar_chart = BarChart::from_json(
    r###"{
        "width": 630,
        "height": 410,
        "margin": {
            "left": 10,
            "top": 5,
            "right": 10
        },
        "title_text": "Bar Chart",
        "title_font_color": "#345",
        "title_align": "right",
        "sub_title_text": "demo",
        "legend_align": "left",
        "series_list": [
            {
                "name": "Email",
                "label_show": true,
                "data": [120.0, 132.0, 101.0, 134.0, 90.0, 230.0, 210.0]
            },
            {
                "name": "Union Ads",
                "data": [220.0, 182.0, 191.0, 234.0, 290.0, 330.0, 310.0]
            }
        ],
        "x_axis_data": [
            "Mon",
            "Tue",
            "Wed",
            "Thu",
            "Fri",
            "Sat",
            "Sun"
        ]
    }"###,
).unwrap();
println!("{}", bar_chart.svg().unwrap());
svg_to_png(&bar_chart.svg().unwrap()).unwrap();

Scaled image export

use charts_rs::{BarChart, svg_to_png_with_size};
let chart = BarChart::from_json(r###"{ ... }"###).unwrap();
let svg = chart.svg().unwrap();

// Scale to exactly 800×400
let png = svg_to_png_with_size(&svg, Some(800), Some(400)).unwrap();

// Scale to width 800, preserve aspect ratio
let png = svg_to_png_with_size(&svg, Some(800), None).unwrap();

Load more fonts

let buf = fs::read(file).unwrap();
get_or_try_init_fonts(vec![&buf]));

License

This project is licensed under the Apache-2.0 license.

charts-rs 0.4.1