Radar / spider chart

Multi-axis polygon overlay for multivariate comparison. Each entity becomes one polygon; vertices land on the per-axis value projected onto a polar coord system.

The demo plots the 1960 Rome Olympics medal table: USA vs USSR across five categories (gold / silver / bronze / track-and- field medals / total). 1960 was the first Summer Games the USSR topped the table at — the kickoff of the Cold War medal rivalry that ran through the 1988 Seoul boycott. The visible gap on the Total spoke shows the USSR's 32-medal margin.

Source: 1960 Summer Olympics medal table — Wikipedia

Public surface

use wisp_chart::polar::{Radar, RadarAxis, RadarSeries};
use wisp_chart::color::Color;

let r = Radar::new(
    vec![
        RadarAxis::new("speed",       (0.0, 100.0)),
        RadarAxis::new("range",       (0.0, 100.0)),
        RadarAxis::new("comfort",     (0.0, 100.0)),
        RadarAxis::new("efficiency",  (0.0, 100.0)),
        RadarAxis::new("price",       (0.0, 100.0)),
    ],
    vec![
        RadarSeries::new("Model A", vec![80.0, 70.0, 60.0, 90.0, 50.0], Color::from_hex("#0072b2").unwrap()),
        RadarSeries::new("Model B", vec![60.0, 85.0, 80.0, 70.0, 75.0], Color::from_hex("#d55e00").unwrap()),
    ],
);

Layout

Convex caveat

Best uses