Donut chart

import {Fill, Easing, interpolate, useBrand, useFrame, useDesignScale} from "odori";

export type DonutSlice = {label: string; value: number};

export type DonutChartProps = {
  slices: DonutSlice[];
  /** Held in the middle of the ring. */
  centerLabel?: string;
  title?: string;
};

/**
 * Part to whole with a stable center. Slices sweep in order around one ring,
 * and the center metric never moves, so the eye has somewhere to rest.
 */
export const DonutChart = ({slices, centerLabel, title}: DonutChartProps) => {
  const frame = useFrame();
  const brand = useBrand();
  const scale = useDesignScale();
  const total = slices.reduce((sum, slice) => sum + slice.value, 0) || 1;
  const sweep = interpolate(frame, [10, 62], [0, 1], {easing: Easing.standard});
  const radius = 40;
  const circumference = 2 * Math.PI * radius;
  let offset = 0;

  return (
    <Fill style={{alignItems: "center", gap: 34 * scale, justifyContent: "center", padding: 100 * scale}}>
      {title ? (
        <div style={{fontSize: 54 * scale, fontWeight: 560, letterSpacing: "-0.04em", opacity: interpolate(frame, [0, 16], [0, 1])}}>
          {title}
        </div>
      ) : null}
      <div style={{height: 460 * scale, position: "relative", width: 460 * scale}}>
        <svg style={{height: "100%", transform: "rotate(-90deg)", width: "100%"}} viewBox="0 0 100 100">
          <circle cx={50} cy={50} fill="none" r={radius} stroke={brand.colors.border} strokeWidth={12} />
          {slices.map((slice, index) => {
            const share = (slice.value / total) * sweep;
            const dash = share * circumference;
            const element = (
              <circle
                key={slice.label}
                cx={50}
                cy={50}
                fill="none"
                r={radius}
                stroke={index === 0 ? brand.colors.accent : brand.colors.muted}
                strokeDasharray={`${dash} ${circumference}`}
                strokeDashoffset={-offset * circumference}
                strokeWidth={12}
                opacity={index === 0 ? 1 : 0.45 + index * 0.1}
              />
            );
            offset += slice.value / total;
            return element;
          })}
        </svg>
        {centerLabel ? (
          <div
            style={{
              alignItems: "center",
              display: "flex",
              fontSize: 92 * scale,
              fontWeight: 600,
              inset: 0,
              justifyContent: "center",
              letterSpacing: "-0.05em",
              position: "absolute",
            }}
          >
            {centerLabel}
          </div>
        ) : null}
      </div>
      <div style={{color: brand.colors.muted, display: "flex", fontSize: 28 * scale, gap: 28 * scale}}>
        {slices.map((slice) => (
          <span key={slice.label}>
            {slice.label} {Math.round((slice.value / total) * 100)}%
          </span>
        ))}
      </div>
    </Fill>
  );
};

import {defineComponentPreview} from "odori/preview";
import {DonutChart} from "./donut-chart";

export default defineComponentPreview({
  title: "Donut chart",
  category: "Data",
  description: "Part-to-whole display with a stable center metric.",
  component: DonutChart,
  canvas: {width: 1920, height: 1080, duration: "4s"},
  controls: {
    title: {type: "text", defaultValue: "Where render time goes"},
    centerLabel: {type: "text", defaultValue: "72%"},
  },
  examples: [
    {
      name: "Split",
      props: {
        slices: [
          {label: "encode", value: 72},
          {label: "paint", value: 18},
          {label: "audio", value: 10},
        ],
        centerLabel: "72%",
      },
    },
  ],
});

import {Scene, Video} from "odori";
import {DonutChart} from "../components/donut-chart/donut-chart";

<Video>
  <Scene id="donut-chart" duration="4s">
    <DonutChart
      slices={[
        {
          label: "encode",
          value: 72
        },
        {
          label: "paint",
          value: 18
        },
        {
          label: "audio",
          value: 10
        }
      ]}
      centerLabel="72%"
      title="Where render time goes"
    />
  </Scene>
</Video>