Area chart

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

export type AreaChartProps = {
  values: number[];
  title?: string;
  detail?: string;
};

/**
 * A filled trend for volume and cumulative change. The fill wipes in with the
 * path, so the area never appears ahead of the line that bounds it.
 */
export const AreaChart = ({values, title, detail}: AreaChartProps) => {
  const frame = useFrame();
  const brand = useBrand();
  const scale = useDesignScale();
  const max = Math.max(...values, 1);
  const draw = interpolate(frame, [12, 62], [0, 1], {easing: Easing.standard});
  const points = values.map((value, index) => ({
    x: (index / Math.max(1, values.length - 1)) * 100,
    y: 100 - (value / max) * 92,
  }));
  const line = points.map((p, i) => `${i === 0 ? "M" : "L"} ${p.x} ${p.y}`).join(" ");
  const area = `${line} L 100 100 L 0 100 Z`;

  return (
    <Fill style={{gap: 30 * scale, justifyContent: "center", padding: `${110 * scale}px ${130 * scale}px`}}>
      {title ? (
        <div style={{fontSize: 58 * scale, fontWeight: 560, letterSpacing: "-0.04em", opacity: interpolate(frame, [0, 16], [0, 1])}}>
          {title}
        </div>
      ) : null}
      <div style={{height: 460 * scale, width: "100%"}}>
        <svg preserveAspectRatio="none" style={{clipPath: `inset(0 ${(1 - draw) * 100}% 0 0)`, height: "100%", width: "100%"}} viewBox="0 0 100 100">
          <path d={area} fill={brand.colors.accent} opacity={0.18} />
          <path d={line} fill="none" stroke={brand.colors.accent} strokeWidth={9 * scale} vectorEffect="non-scaling-stroke" />
        </svg>
      </div>
      {detail ? (
        <div style={{color: brand.colors.muted, fontSize: 32 * scale, opacity: interpolate(frame, [56, 74], [0, 1])}}>{detail}</div>
      ) : null}
    </Fill>
  );
};

import {defineComponentPreview} from "odori/preview";
import {AreaChart} from "./area-chart";

export default defineComponentPreview({
  title: "Area chart",
  category: "Data",
  description: "Filled trend reveal for volume and cumulative change.",
  component: AreaChart,
  canvas: {width: 1920, height: 1080, duration: "4s"},
  controls: {
    title: {type: "text", defaultValue: "Frames rendered"},
    detail: {type: "text", defaultValue: "Cumulative, across every format."},
  },
  examples: [{name: "Adoption", props: {values: [2, 5, 9, 14, 22, 31, 44, 60]}}],
});

import {Scene, Video} from "odori";
import {AreaChart} from "../components/area-chart/area-chart";

<Video>
  <Scene id="area-chart" duration="4s">
    <AreaChart
      values={[
        2,
        5,
        9,
        14,
        22,
        31,
        44,
        60
      ]}
      title="Frames rendered"
      detail="Cumulative, across every format."
    />
  </Scene>
</Video>