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HTML

              
                <!-- <div style="position: absolute;">WIP</div> -->
<div id="app"></div>

              
            
!

CSS

              
                body {
  height: 100vh;
}

#app {
  height: 100vh;
}

              
            
!

JS

              
                const NUM_OF_BARS = 10;
const MAX_RENDA = 18;

const BACK_ALPHA = 0.2;
const FRONT_ALPHA = 0.8;

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      countPerSec: 0,
      ceil: 0
    };
  }
  render() {
    const App = window.styled.div`
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
    `;
    const SiiyaButton = window.styled.button`
      flex: 1 1 auto;
      width: 20em;
      background-color: #eefeba;
      font-family: "M PLUS Rounded 1c";
      margin-top: 3px;
      transition: all 1s ease;
      &:hover {
        background-color: #efabaa;
      }
    `;
    return (
      <App>
        <Bars
          countPerSec={this.state.countPerSec}
          numOfBars={NUM_OF_BARS}
          ceil={this.state.ceil}
        />
        <SiiyaButton onClick={() => this.pound()}>連打しや</SiiyaButton>
      </App>
    );
  }
  pound() {
    const currentTime = performance.now();
    if (this.lastTime == null) {
      this.lastTime = currentTime;
    } else {
      const delta = currentTime - this.lastTime;
      this.lastTime = currentTime;
      // calc hz
      const cPerSec = (1 / delta) * 1000;
      if (cPerSec > this.state.ceil) {
        this.setState({
          countPerSec: cPerSec,
          ceil: cPerSec
        });
      } else {
        this.setState({
          countPerSec: cPerSec
        });
      }
    }
  }
}

class Bars extends React.Component {
  render() {
    const bars = [];
    const delta = Math.floor(255 / this.props.numOfBars);
    const progress = Math.floor(
      (this.props.countPerSec / MAX_RENDA) * NUM_OF_BARS
    );
    for (let i = 0; i < this.props.numOfBars; i++) {
      const rr = i * delta;
      const gg = 20;
      const bb = 255 - rr;
      const alpha = i < progress ? FRONT_ALPHA : BACK_ALPHA;
      const code = `#${hexColor(rr)}${hexColor(gg)}${hexColor(bb)}`;
      bars.push(<Bar key={code} rr={rr} gg={gg} bb={bb} alpha={alpha} />);
    }
    const Bars = window.styled.div`
      display: flex;
      flex-direction: column-reverse;
      flex: 3 1 auto;
      width: 20em;
    `;
    const Count = window.styled.div`
      position: absolute;
      top: 14px;
      left: 0;
      right: 0;
      text-align: center;
      font-size: 2em;
      font-family: "Nico Moji", "M PLUS Rounded 1c";
    `;
    return (
      <Bars>
        <Count>
          {this.props.countPerSec.toFixed(2)}回/s
          <br />
          MAX:{this.props.ceil.toFixed(2)}回/s
        </Count>
        {bars}
      </Bars>
    );
  }
}

class Bar extends React.Component {
  render() {
    let changeAlpha = null;
    if (this.props.alpha >= 0.5) {
      changeAlpha = window.styled.keyframes`
        from {
          background-color: rgba(${this.props.rr}, ${this.props.gg}, ${this.props.bb}, ${this.props.alpha});
        }
        to {
          background-color: rgba(${this.props.rr}, ${this.props.gg}, ${this.props.bb}, ${BACK_ALPHA});
        }
      `;
    }
    const Bar = window.styled.div`
      flex: 1 1 auto;
      background-color: rgba(${this.props.rr}, ${this.props.gg}, ${this.props.bb}, ${BACK_ALPHA});
      animation: ${changeAlpha} 1s linear;
    `;
    return <Bar></Bar>;
  }
}

function hexColor(c) {
  if (c < 256) {
    if (c < 16) {
      return "0" + Math.abs(c).toString(16);
    }
    return Math.abs(c).toString(16);
  }
  return 0;
}

ReactDOM.render(<App />, document.getElementById("app"));

              
            
!
999px

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