// npm install
npm install svg-gauge

// Require JS
var Gauge = require("svg-gauge");

// Standalone
var Gauge = window.Gauge;

// Create a new Gauge
var cpuGauge = Gauge(document.getElementById("cpuSpeed"), {
    max: 100,
    // custom label renderer
    label: function(value) {
      return Math.round(value) + "/" + this.max;
    },
    value: 50,
    // Custom dial colors (Optional)
    color: function(value) {
      if(value < 20) {
        return "#5ee432"; // green
      }else if(value < 40) {
        return "#fffa50"; // yellow
      }else if(value < 60) {
        return "#f7aa38"; // orange
      }else {
        return "#ef4655"; // red
      }
    }
});

// Set gauge value
cpuGauge.setValue(75);

// Set value and animate (value, animation duration in seconds)
cpuGauge.setValueAnimated(90, 1);

import React, { useEffect, useRef } from "react";
import SvgGauge from "svg-gauge";

const defaultOptions = {
  animDuration: 1,
  showValue: true,
  initialValue: 0,
  max: 100
  // Put any other defaults you want. e.g. dialStartAngle, dialEndAngle, radius, etc.
};

const Gauge = props => {
  const gaugeEl = useRef(null);
  const gaugeRef = useRef(null);
  useEffect(() => {
    if (!gaugeRef.current) {
      const options = { ...defaultOptions, ...props };
      gaugeRef.current = SvgGauge(gaugeEl.current, options);
      gaugeRef.current.setValue(options.initialValue);
    }
    gaugeRef.current.setValueAnimated(props.value, 1);
  }, [props]);

  return <div ref={gaugeEl} className="gauge-container" />;
};

export default Gauge;

// to render:
const renderGauge = () => (
  <Gauge
    value={42}
    // any other options you want
  />
);