快和慢,老式投影仪动画

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html

css

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html

css

body, html {
  height: 100%;background-color: #CCFDFC;
}

* {
  box-sizing: border-box;
}

#app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0 4rem;
}

.screen {
  width: 320px;
  height: 320px;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow: 0px 10px 30px #f2f2f2, 0px 3px 4px #d9d9d9;
  position: relative;
  display: flex;
  align-items: center;
  border-radius: 160px;background-color: #fff;
}

.reel {
  position: absolute;
  height: 241px;
  left: 0;
}

.projector {
  width: 100%;
  max-width: 320px;
}

p {
  margin: 1.25em 0 0.75em 0;
  font-weight: bold;
  padding: 0;
  line-height: 1;
  font-family: arial;
}

input[type=range] {
  -webkit-appearance: none;
  /* Hides the slider so that custom slider can be made */
  width: 100%;
  /* Specific width is required for Firefox. */
  background: transparent;
  /* Otherwise white in Chrome */
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
}

input[type=range]:focus {
  outline: none;
  /* Removes the blue border. You should probably do some kind of focus styling for accessibility reasons though. */
}

input[type=range]::-ms-track {
  width: 100%;
  cursor: pointer;
  /* Hides the slider so custom styles can be added */
  background: transparent;
  border-color: transparent;
  color: transparent;
}

/* Special styling for WebKit/Blink */
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 8px;
  background: #0db9f2;
  cursor: pointer;
  margin-top: -6px;
  /* You need to specify a margin in Chrome, but in Firefox and IE it is automatic */
  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.5);
}

/* All the same stuff for Firefox */
input[type=range]::-moz-range-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 8px;
  background: #0db9f2;
  cursor: pointer;
  margin-top: -6px;
  /* You need to specify a margin in Chrome, but in Firefox and IE it is automatic */
  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.5);
}

/* All the same stuff for IE */
input[type=range]::-ms-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 8px;
  background: #0db9f2;
  cursor: pointer;
  margin-top: -6px;
  /* You need to specify a margin in Chrome, but in Firefox and IE it is automatic */
  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.5);
}

input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 3px;
  cursor: pointer;
  background: #9cbec9;
  border-radius: 1.3px;
}

input[type=range]:focus::-webkit-slider-runnable-track {
  background: #367ebd;
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 3px;
  cursor: pointer;
  background: #9cbec9;
  border-radius: 1.3px;
}

input[type=range]::-ms-track {
  width: 100%;
  height: 3px;
  cursor: pointer;
  background: #9cbec9;
  border-radius: 1.3px;
}

input[type=range]::-ms-fill-lower {
  width: 100%;
  height: 3px;
  cursor: pointer;
  background: #9cbec9;
  border-radius: 1.3px;
}

input[type=range]:focus::-ms-fill-lower {
  background: #3071a9;
}

input[type=range]::-ms-fill-upper {
  width: 100%;
  height: 3px;
  cursor: pointer;
  background: #9cbec9;
  border-radius: 1.3px;
}

input[type=range]:focus::-ms-fill-upper {
  background: #9cbec9;
}

JavaScript

const { useState, useEffect } = React;

const Reel = ({ speed }) => {

const [left, setLeft] = useState(0);

useEffect(() => {
    let counter = setInterval(() => {
      setLeft(prevLeft => {
        if (prevLeft <= (2880 - (320 + speed)) * -1) {
          return 0;
        }
        return prevLeft - speed;
      });
    }, 41.6667);
    return () => clearInterval(counter);
  });

return (
    React.createElement("img", {
      className: "reel",
      src: "https://i.postimg.cc/rcBS3Y3k/frames-v2.png",
      alt: "\uD83C\uDFA0",
      style: { left } }));

};

return (
    React.createElement(React.Fragment, null,
    React.createElement("div", { className: "screen" },
    React.createElement(Reel, { speed: speed * 6.4 })),

React.createElement("p", null, msg),
    React.createElement("input", {
      onInput: handleSpeed,
      value: speed,
      type: "range",
      className: "projector" })));

};

// Render app
ReactDOM.render(React.createElement(App, null), document.getElementById("app"));

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