React Scroll Parallax

react-scroll-parallax.markdown

React Scroll Parallax

Experimenting with some scroll based parallax effects in React. Uses react-scroll-parallax which provides a react component and single passive scroll listener to add vertical scrolling based offsets to elements based on their position in the viewport.

A Pen by J Scott Smith on CodePen.

License.

script.babel

/**
 * -------------------------------------------------------
 * React Scroll Parallax
 * -------------------------------------------------------
 * 
 * Experimenting with some scroll based parallax effects 
 * using React. See react-scroll-parallax:
 * https://github.com/jscottsmith/react-scroll-parallax
 *
 */

const getRandomInt = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1)) + min;
};

const P1 = {
    bounds: [134, 281],
    forms: [
        <svg viewBox="0 0 134 281">
            <rect className="fill-1" y="22" width="67" height="204"/>
        </svg>,
        <svg viewBox="0 0 134 281">
            <ellipse className="fill-2" cx="67" cy="89" rx="67" ry="67"/>
        </svg>,
        <svg viewBox="0 0 134 281">
            <circle className="fill-1" cx="67" cy="89" r="25"/>
        </svg>,
    ],
};

const A2 = {
    bounds: [167, 281],
    forms: [
        <svg viewBox="0 0 167 281" version="1.1">
            <polygon className="fill-4" points="0,226 83.5,0.1 167,226 "/>
        </svg>,
        <svg viewBox="0 0 167 281" version="1.1">
            <path className="fill-1" d="M112.8,211.8v29.5c0,16.3-13.2,29.5-29.5,29.5s-29.5-13.2-29.5-29.5v-29.5 c0-16.3,13.2-29.5,29.5-29.5S112.8,195.5,112.8,211.8z"/>
        </svg>,
    ],
};

const R3 = {
    bounds: [135, 281],
    forms: [
        <svg viewBox="0 0 135 281" version="1.1">
            <path className="fill-2" d="M67,22H0v134h67c37,0,67-30,67-67S104,22,67,22z"/>
        </svg>,
        <svg viewBox="0 0 135 281" version="1.1">
            <polygon className="fill-6" points="55,226 55,92 135,226 "/>
        </svg>,
        <svg viewBox="0 0 135 281" version="1.1">
            <rect className="fill-1" y="22" width="55" height="204"/>
        </svg>,
    ]
};

const A4 = {
    bounds: [167, 281],
    forms: [
        <svg viewBox="0 0 167 281" version="1.1">
            <polygon className="fill-5" points="0,226 83.5,0.1 167,226 "/>
        </svg>,
        <svg viewBox="0 0 167 281" version="1.1">
            <path className="fill-1" d="M112.8,211.8v29.5c0,16.3-13.2,29.5-29.5,29.5s-29.5-13.2-29.5-29.5v-29.5 c0-16.3,13.2-29.5,29.5-29.5S112.8,195.5,112.8,211.8z"/>
        </svg>,
    ]
};

const L5 = {
    bounds: [110, 281],
    forms: [
        <svg viewBox="0 0 110 281" version="1.1">
            <rect className="fill-1" y="22" width="55" height="204"/>
        </svg>,
        <svg viewBox="0 0 110 281" version="1.1">
            <path className="fill-4" d="M0,226c0,30.4,24.6,55,55,55s55-24.6,55-55H0z"/>
        </svg>,
    ],
};

const L6 = {
    bounds: [110, 281],
    forms: [
        <svg viewBox="0 0 110 281" version="1.1">
            <rect className="fill-1" y="22" width="55" height="204"/>
        </svg>,
        <svg viewBox="0 0 110 281" version="1.1">
            <path className="fill-2" d="M0,226c0,30.4,24.6,55,55,55s55-24.6,55-55H0z"/>
        </svg>,
    ],
};

const A7 = {
    bounds: [167, 281],
    forms: [
        <svg viewBox="0 0 167 281" version="1.1">
            <polygon className="fill-3" points="0,226 83.5,0.1 167,226 "/>
        </svg>,
        <svg viewBox="0 0 167 281" version="1.1">
            <path className="fill-1" d="M112.8,211.8v29.5c0,16.3-13.2,29.5-29.5,29.5s-29.5-13.2-29.5-29.5v-29.5 c0-16.3,13.2-29.5,29.5-29.5S112.8,195.5,112.8,211.8z"/>
        </svg>,
    ],
};

const X8 = {
    bounds: [204, 281],
    forms: [
        <svg viewBox="0 0 204 281" version="1.1">
            <polygon className="fill-2" points="0.2,192 34.1,226 203.5,56 169.6,22 "/>
        </svg>,
        <svg viewBox="0 0 204 281" version="1.1">
            <polygon className="fill-1" points="0.2,56 34.1,22 203.5,192 169.6,226 "/>
        </svg>,
    ],
};

const Gradients = () => (
    <svg width="50" height="50" version="1.1" className="hidden">
        <defs>
            <linearGradient id="gradient-1" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#6ED0DD" />
                <stop offset="100%" stopColor="#70E2B9" />
            </linearGradient>
            <linearGradient id="gradient-2" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#405D86" />
                <stop offset="100%" stopColor="#384257" />
            </linearGradient>
            <linearGradient id="gradient-3" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#ED6088" />
                <stop offset="100%" stopColor="#C86FA3" />
            </linearGradient>
            <linearGradient id="gradient-4" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#F07F6B" />
                <stop offset="100%" stopColor="#EFC15C" />
            </linearGradient>
            <linearGradient id="gradient-5" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#8D63B1" />
                <stop offset="100%" stopColor="#8179CB" />
            </linearGradient>
            <linearGradient id="gradient-6" x1="0" x2="0" y1="0" y2="1">
                <stop offset="0%" stopColor="#EDD460" />
                <stop offset="100%" stopColor="#EDBC39" />
            </linearGradient>
        </defs>
    </svg>
);

const word = [P1, A2, R3, A4, L5, L6, A7, X8];

class Letter extends React.Component {
    render() {
        const { letter } = this.props;
        const offset = getRandomInt(50, 150);
        const isSlower = getRandomInt(0, 1) ? true : false;
        return (
            <div className="letter" style={{
                width: letter.bounds[0] / 10 + 'rem',
                height: letter.bounds[1] / 10 + 'rem',
            }}>
                {letter.forms.map((X, i) => 
                    <Parallax
                        className="form"
                        key={i}                        
                        offsetYMin={-offset * (i + 1) + 'px'}
                        offsetYMax={offset * (i + 1) + 'px'}
                        slowerScrollRate={isSlower}
                    >
                        {X}
                    </Parallax>
                )}
            </div>
        );
    }
}

const Scroll = () => (
    <div className="scroll">
        <p>Scroll</p>
        <svg version="1.1" x="0px" y="0px" viewBox="0 0 167 299">
            <polygon className="fill-3" points="167,73 83.5,298.9 0,73 "/>
            <polygon className="fill-1" points="137.4,0 83.5,145.9 29.6,0 "/>
        </svg>
    </div>
);

const Github = () => (
    <a href="https://github.com/jscottsmith/react-scroll-parallax" rel="noopener" target="_blank" className="button">GitHub</a>
);

const Fullscreen = () => (
    <a href="https://codepen.io/jscottsmith/full/eREbwz/" rel="noopener" target="_blank" className="fullscreen">
        <svg version="1.1" x="0px" y="0px" viewBox="0 0 30 30">
            <polygon points="16.5,15 23.1,8.3 26,11.2 26,4 18.8,4 21.7,6.9 15,13.5 8.3,6.9 11.2,4 4,4 4,11.2 6.9,8.3 13.5,15  6.9,21.7 4,18.8 4,26 11.2,26 8.3,23.1 15,16.5 21.7,23.1 18.8,26 26,26 26,18.8 23.1,21.7 	"/>
        </svg>
    </a>
);

const ParallaxWord = () => (
    <div className="word">
        {word.map((X, i) => 
            <Letter key={i} letter={X} />
        )}
    </div>
);

const App = () => (
    <ParallaxProvider>
        <main>
            <Scroll />
            <Gradients />
            <ParallaxWord />
            <Github />
            <Fullscreen />
        </main>
    </ParallaxProvider>
);


const run = () => {
    const root = document.createElement('div');
    document.body.appendChild(root);
    
    const scrollAnimation = { scrollTop: 0 };
    const scrollTop = document.body.clientHeight / 2 - window.innerHeight / 2;
    
    const tween = TweenLite.to(scrollAnimation, 2, {
        scrollTop: scrollTop,
        ease: Power2.easeInOut,
        onUpdate: () => {
            window.scrollTo(0, scrollAnimation.scrollTop);
        }
    });
    
    window.addEventListener('mousewheel', function mouseHandler() {
        tween.kill();
        window.removeEventListener('mousewheel', mouseHandler, false);
    }, false);
    
    ReactDOM.render(
        <App />,
        root
    );
}

run();

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.1/react-dom.js"></script>
<script src="https://codepen.io/jscottsmith/pen/KqvEKv"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.1/react.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.1/TweenMax.min.js"></script>
<script src="https://unpkg.com/[email protected]/prop-types.js"></script>

style.scss

html {
    font-size: 0.5vw; 
}

body {
    position: relative;
    background-color: #F2EEDD;
    background-image: linear-gradient(to bottom, #7DE2FC 0%, #ffecd2 100%);
    height: 400rem;
    min-height: 300vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll {
    position: absolute;
    top: 50vh;
    left: 50%;
    margin-left: -7rem;
    width: 14rem;
    height: auto;
    font-family: Futura, Helvetica, sans-serif;
    font-weight: bold;
    letter-spacing: 0.3rem;
    text-align: center;
    text-transform: uppercase;
    font-size: 3rem;
    color: #405D86;
    
    svg {
        margin: 0 2rem;
    }
}

.word {
    display: flex;
    flex-flow: row nowrap;
    align-items: center;
}

.letter {
    position: relative;
    margin: 0 1.8rem;
    &:first-of-type {
        margin-right: -2rem; // P/A kerning
    }
}

.form {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    
    svg {
        display: block;
        width: 100%;
        height: auto;
        // background-color: rgba(salmon, 0.2);
    }
}

.fill-1 {
    fill: url(#gradient-2); // #405D86;
}

.fill-2 {
    fill: url(#gradient-6);
}

.fill-3 {
    fill: url(#gradient-3); // #ED6088;
}

.fill-4 {
    fill: url(#gradient-1); // #6ED0DD
}

.fill-5 {
    fill: url(#gradient-4);
}

.fill-6 {
    fill: url(#gradient-5);
}

.hidden {
    position: absolute;
    top: -1000rem;
    left: -1000rem;
    width: 0;
    height: 0;
}

.button {
    position: absolute;
    width: 24rem;
    height: 10rem;
    bottom: 50vh;
    left: 50%;
    margin-left: -12rem;
    
    font-family: Futura, Helvetica, sans-serif;
    font-weight: bold;
    letter-spacing: 0.3rem;
    text-align: center;
    line-height: 10rem;
    text-transform: uppercase;
    font-size: 3rem;
    text-decoration: none;
    background-image: linear-gradient(to bottom, #8D63B1 0%, #8179CB 100%);
    color: #ffffff;
    
    &:hover {
        background-image: linear-gradient(to bottom, #405D86 0%, #384257 100%);
    }
}

.fullscreen {
    position: fixed;
    width: 32px;
    height: 32px;
    bottom: 20px;
    right: 20px;
    svg {
        fill: url(#gradient-5);
    }
    &:hover {
        svg {
            fill: url(#gradient-2);
        }
    }
}