Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                html {
  font-size: 18px;
  
  @media (min-width: 900px) {
    font-size: 24px;
  }
}

body {
  font-family: 'Montserrat', sans-serif;
  font-weight: 300;
  line-height: 1.45;
  color: #0F1108;
}

h1 {
  font-size: 2.2rem;
  margin: 0;
  font-weight: 600;
  line-height: 1.15;
  
  @media (min-width: 900px) {
    font-size: 2.488rem;
  }
}

h2 {
  font-size: 1.4rem;
  margin: 0.5rem 0;
  line-height: 1.15;
  font-weight: 200;
  
  @media (min-width: 900px) {
    margin: 1rem 0;
    font-size: 1.44rem;
  }
}

p {
  margin-top: 0.25rem;
  
  @media (min-width: 900px) {
    margin-top: 0.5rem;
  }
}

a {
  color: #0F1108;
  text-decoration: none;
  border-bottom: currentcolor 1px solid;
}

// General modules
.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 0 1rem 100px 1rem;
  
  @media (min-width: 900px) {
    max-width: 650px;
    padding: 0 1rem 90px 1rem;
  }
}

// Full-screen wrapper
.app {
  position: relative;
  background: #F2E9DE;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 2rem);
  margin: 1rem;
  overflow: hidden;
  
  // Modifiers
  &--debug {
    .grab-zone {
      background: rgba(0, 0, 0, 0.15);
    }
    .grab-zone__debug {
      display: block;
    }
    .grab-zone__danger {
      background: rgba(0, 0, 0, 0.15);
    }
    .grabber__arm-wrapper {
      background: rgba(0, 0, 0, 0.15);
    }
  }
}

.grab-zone-wrapper {
  position: absolute;
  bottom: 0;
  right: 0;
  transform: translateX(30%) translateY(50%);
}

.grab-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  
  &__danger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 400px;
    height: 400px;
    border-radius: 50%;
  }
  
  &__debug {
    display: none;
    position: absolute;
    width: 300px;
    top: -100px;
    font-size: 14px;
    text-align: center;
    text-transform: uppercase;
  }
}

.grabber {
  position: relative;
  width: 100px;
  height: 100px;
  
  &__arm-wrapper {
    position: absolute;
    top: -80px;
    width: 24px;
    height: 260px;
  }

  &__arm {
    position: relative;
    width: 24px;
    height: 200px;
    background: #7D9A9E;
    border-radius: 20px;
    overflow: visible;
    transform: translateY(100%);
    transition: transform 0.2s ease;
  }

  &__hand {
    display: block;
    position: absolute;
    top: -12px;
    transform: scale(1.4) rotate(-10deg) translateY(100%);
    transform-origin: bottom center;
    transition: transform 0.3s ease;
  }
  
  &__face {
    position: absolute;
    width: 75px;
    height: 84px;
    right: 5%;
    transition: transform 0.3s ease;
  }
  
  
  &__body {
    position: absolute;
    top: 50%;
    left: 0%;
    width: 110px;
    height: 95px;
    border-radius: 50%;
    background: #7D9A9E;
    transition: transform 0.3s ease;
  }
  
    
  // Modifiers
  &--waiting {
    .grabber__hand {
      transform: scale(1.4) rotate(-10deg);
    }
    .grabber__arm {
      transform: translateY(80%);
    }
    .grabber__face {
      transform: translateY(60%);
    }
  }
  
  // Modifiers
  &--stalking {
    .grabber__hand {
      transform: scale(1.4) rotate(-10deg);
    }
    .grabber__arm {
      transform: translateY(70%);
    }
    .grabber__face {
      transform: translateY(10%);
    }
  }

  &--grabbing {
    .grabber__face {
      transform: translateY(-40%) rotate(10deg);
    }
    .grabber__arm {
      transform: translateY(0%);
    }
    .grabber__body {
      transform: translateY(-20%);
    }
    .grabber__hand {
      transform: scale(1.7) rotate(10deg);
    }
  }
  
  &--grabbed {
    .grabber__arm {
      transition: transform 1s ease;
    }
    .grabber__hand {
      transition: transform 2.5s ease;
    }
    .grabber__face {
      transform: translateY(70%);
      transition: transform 1s ease;
    }
    .grabber__body {
      transform: translateY(50%);
      transition: transform 1s ease;
    }
  }
  
  &--extended {
    .grabber__arm {
      transform: translateY(-20%);
    }
    .grabber__face {
      transform: translateY(-60%) rotate(15deg);
    }
    .grabber__body {
      transform: translateY(-40%);
    }
  }
  
  &--shaka {
    .grabber__arm {
      transform: translateY(50%);           
    }
    .grabber__hand {
      transform: scale(2.5) translateY(10%);
      animation: shaka 0.5s infinite alternate forwards;
      transform-origin: 55% 60%;
    }
    .grabber__face {
      transform: translateY(70%);
      transition: transform 1s ease;
    }
    .grabber__body {
      transform: translateY(50%);
      transition: transform 1s ease;
    }
  }
}

.trap-button {
  position: absolute;
  bottom: 80px;
  right: 70px;
  min-width: 125px;
  background: #8ECACC;
  color: white;
  border-radius: 5px;
  padding: 0.4rem 0.5rem;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.debug-button {
  position: fixed;
  top: 0;
  right: 0;
  background: transparent;
  padding: 1rem;
  margin: 1rem;
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.5;
}

@keyframes shaka {
  0% { transform: scale(2.5) translateY(0%) rotate(-20deg); }
  100% { transform: scale(2.5) translateY(0%) rotate(20deg); }
}
              
            
!

JS

              
                const { useState, useRef, useEffect, useLayoutEffect, createContext } = React;

/**
 * Globals
 */

const CONSTANTS = {
  assetPath: "https://s3-us-west-2.amazonaws.com/s.cdpn.io/184729",
}

const ASSETS = {
  head: `${CONSTANTS.assetPath}/head.svg`,
  waiting: `${CONSTANTS.assetPath}/hand.svg`,
  stalking: `${CONSTANTS.assetPath}/hand-waiting.svg`,
  grabbing: `${CONSTANTS.assetPath}/hand.svg`,
  grabbed: `${CONSTANTS.assetPath}/hand-with-cursor.svg`,
  shaka: `${CONSTANTS.assetPath}/hand-surfs-up.svg`
}

// Preload images
Object.keys(ASSETS).forEach(key => {
  const img = new Image();
  img.src = ASSETS[key];
});


/**
 * Shared hooks
 */

// Hover state - https://dev.to/spaciecat/hover-states-with-react-hooks-4023
const useHover = () => {
  const ref = useRef();
  const [hovered, setHovered] = useState(false);

  const enter = () => setHovered(true);
  const leave = () => setHovered(false);

  useEffect(
    () => {
      ref.current.addEventListener("mouseenter", enter);
      ref.current.addEventListener("mouseleave", leave);
      return () => {
        ref.current.removeEventListener("mouseenter", enter);
        ref.current.removeEventListener("mouseleave", leave);
      };
    },
    [ref]
  );

  return [ref, hovered];
};

// Mouse position
const useMousePosition = () => {
  const [position, setPosition] = useState({ x: 0, y: 0 });

  useEffect(() => {
    const setFromEvent = e => setPosition({ x: e.clientX, y: e.clientY });
    window.addEventListener("mousemove", setFromEvent);

    return () => {
      window.removeEventListener("mousemove", setFromEvent);
    };
  }, []);

  return position;
};

// Element position
const usePosition = () => {
  const ref = useRef();
  const [position, setPosition] = useState({});

  const handleResize = () => {
    setPosition(ref.current.getBoundingClientRect());
  };

  useLayoutEffect(() => {
    handleResize();
    window.addEventListener('resize', handleResize);

    return () => {
      window.removeEventListener('resize', handleResize);
    };
  }, [ref.current]);

  return [ref, position];
};


/**
 * React Components
 */

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      debug: false,
      cursorGrabbed: false,
      gameOver: false,
    };
    
    this.handleToggleDebug = this.handleToggleDebug.bind(this);
    this.handleButtonClicked = this.handleButtonClicked.bind(this);
    this.handleCursorGrabbed = this.handleCursorGrabbed.bind(this);
  }
  
  handleToggleDebug() {
    this.setState({
      debug: !this.state.debug
    });
  }
  
  handleCursorGrabbed() {
    this.setState({
      cursorGrabbed: true
    });
    setTimeout(() => {
      this.setState({
        cursorGrabbed: false
      });
    }, 2000)
  }

    
  handleButtonClicked() {
    this.setState({
      gameOver: true
    });
    setTimeout(() => {
      this.setState({
        gameOver: false
      });
    }, 4000)
  }

  render() {
    const { cursorGrabbed, gameOver, debug } = this.state;
    const screenStyle = cursorGrabbed ? { cursor: "none" } : {};
    const appClass = debug ? "app app--debug" : "app";
    
    return (
      <div className={appClass} style={screenStyle}>
        <section className="container">
          <h1>Hello!</h1>
          <h2>Welcome to the internet.</h2>
          <p>This is a classic website, no traps or weird stuff!</p>
          <p>Feel free to browse, relax and, I don't know, click the button down there? Might as well, right?</p>
          
          <button
            className="debug-button"
            onClick={this.handleToggleDebug}>
              Debug
          </button>
        </section>
        
        <button
          className="trap-button"
          onClick={this.handleButtonClicked}>
            { gameOver && "Nice one" }
            { cursorGrabbed && "Gotcha!" }
            { !gameOver && !cursorGrabbed && "Button!"}
        </button>
        
        <div className="grab-zone-wrapper">
          <GrabZone
            onCursorGrabbed={this.handleCursorGrabbed} 
            cursorGrabbed={cursorGrabbed}
            gameOver={gameOver}
          />
        </div>
      </div>
    );
  }
}

// GrabZone (The hover trigger zone)
const GrabZone = ({ cursorGrabbed, gameOver, onCursorGrabbed }) => {
  const [outerRef, outerHovered] = useHover();
  const [innerRef, innerHovered] = useHover();
  const [isExtended, setExtendedArm] = useState(false);

  let state = "waiting";
  if (outerHovered) {
    state = "stalking";
  }
  if (innerHovered) {
    state = "grabbing";
  }
  if (cursorGrabbed) {
    state = "grabbed";
  }
  if (gameOver) {
    state = "shaka"
  }
  
  // If state is grabbing for a long time, they're being clever!
  useEffect(() => {
      let timer;
      if (state === "grabbing") {
        timer = setTimeout(() => {
          // Not so clever now, are they?
          setExtendedArm(true);
          timer = null;
        }, 2000);
      }
      return () => {
        setExtendedArm(false);
        if (timer) {
          clearTimeout(timer);
        }
      };
    },
    [state]
  );

  return (
    <div className="grab-zone" ref={outerRef}>
      <div className="grab-zone__debug">
        <strong>Debug info:</strong>
        <p>Current state: {state}</p>
        <p>Extended arm: {isExtended ? "Yes" : "No"}</p>
      </div>
      <div className="grab-zone__danger" ref={innerRef}>
        <Grabber
          state={state}
          gameOver={gameOver}
          extended={isExtended}
          onCursorGrabbed={onCursorGrabbed}
        />
      </div>
    </div>
  );
};

// Grabber (The graphic)
const Grabber = ({ state, gameOver, extended, onCursorGrabbed }) => {
  const mousePos = useMousePosition();
  const [ref, position] = usePosition();
  const hasCursor = false;

  // Calculate rotation of armWrapper
  const x = position.left + position.width * 0.5;
  const y = position.top + position.height * 0.5;
  const angle = gameOver ? 0 : Math.atan2(mousePos.x - x, -(mousePos.y - y)) * (180 / Math.PI);
  
  // Ensure value is within acceptable range (-75 to 75)
  const rotation = Math.min(Math.max(parseInt(angle), -79), 79);
  
  const grabberClass = `grabber grabber--${state} ${extended && "grabber--extended"}`;
  const wrapperStyle = { transform: `rotate(${rotation}deg)` };

  let handImageSrc = ASSETS[state];

  return (
    <div className={grabberClass}>
      <div className="grabber__body"></div>
      <img className="grabber__face" src={ASSETS.head} />
      <div className="grabber__arm-wrapper" ref={ref} style={wrapperStyle}>
        <div className="grabber__arm">
          <img
            className="grabber__hand"
            src={handImageSrc}
            onMouseEnter={onCursorGrabbed}
          />
        </div>
      </div>
    </div>
  );
};

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

              
            
!
999px

Console