speice.io/blog/2024-11-15-playing-with-fire/1-introduction/GasketWeighted.tsx

import { useContext, useEffect, useState } from "react";
import { PainterContext } from "../src/Canvas";
import { chaosGameWeighted } from "./chaosGameWeighted";
import TeX from "@matejmazur/react-katex";

import styles from "../src/css/styles.module.css";

type Transform = (x: number, y: number) => [number, number];

export default function GasketWeighted() {
  const [f0Weight, setF0Weight] = useState<number>(1);
  const [f1Weight, setF1Weight] = useState<number>(1);
  const [f2Weight, setF2Weight] = useState<number>(1);

  const f0: Transform = (x, y) => [x / 2, y / 2];
  const f1: Transform = (x, y) => [(x + 1) / 2, y / 2];
  const f2: Transform = (x, y) => [x / 2, (y + 1) / 2];

  const { width, height, setPainter } = useContext(PainterContext);

  useEffect(() => {
    const transforms: [number, Transform][] = [
      [f0Weight, f0],
      [f1Weight, f1],
      [f2Weight, f2]
    ];
    setPainter(chaosGameWeighted({ width, height, transforms }));
  }, [f0Weight, f1Weight, f2Weight]);

  const weightInput = (title, weight, setWeight) => (
    <>
      <div className={styles.inputElement}>
        <p><TeX>{title}</TeX>: {weight}</p>
        <input type={"range"} min={0} max={1} step={.01} value={weight}
               onInput={e => setWeight(Number(e.currentTarget.value))} />
      </div>
    </>
  );

  return (
    <>
      <div className={styles.inputGroup} style={{ display: "grid", gridTemplateColumns: "1fr 1fr 1fr" }}>
        {weightInput("F_0", f0Weight, setF0Weight)}
        {weightInput("F_1", f1Weight, setF1Weight)}
        {weightInput("F_2", f2Weight, setF2Weight)}
      </div>
    </>
  );
}