Webleb - fragmentos de código - Efecto de desplazamiento al navegar por las imágenes

HTML

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Andev Web</title>
  <link rel="stylesheet" href="./style.css">

</head>
<body>
<div class="content">
				<svg class="distort" width="350" height="450" viewBox="0 0 350 450">
					<filter id="distortionFilter">
						<feTurbulence type="turbulence" baseFrequency="0.07 0.01" numOctaves="5" seed="2" stitchTiles="stitch" x="0%" y="0%" width="100%" height="100%" result="noise"/>
						<feDisplacementMap in="SourceGraphic" in2="noise" scale="0" xChannelSelector="R" yChannelSelector="B" x="0%" y="0%" width="100%" height="100%" filterUnits="userSpaceOnUse"/>
					</filter>
					<g filter="url(#distortionFilter)">
						<image class="distort__img" x="50" y="50" xlink:href="https://images.unsplash.com/photo-1530092285049-1c42085fd395?w=500&auto=format&fit=crop&q=60&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8MTB8fHNwcmluZ3xlbnwwfHwwfHx8MA%3D%3D" height="350" width="250"/>
						<image class="distort__img" x="50" y="50" xlink:href="https://images.unsplash.com/photo-1532347922424-c652d9b7208e?w=500&auto=format&fit=crop&q=60&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8NHx8c3VtbWVyfGVufDB8fDB8fHww" height="350" width="250"/>
						<image class="distort__img" x="50" y="50" xlink:href="https://images.unsplash.com/photo-1543837173-6c26bc89937b?w=500&auto=format&fit=crop&q=60&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8OHx8YXV0dW1ufGVufDB8fDB8fHww" height="350" width="250"/>
						<image class="distort__img" x="50" y="50" xlink:href="https://images.unsplash.com/photo-1551582045-6ec9c11d8697?w=500&auto=format&fit=crop&q=60&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8N3x8d2ludGVyfGVufDB8fDB8fHww" height="350" width="250"/>
					</g>
				</svg>
				<nav class="menu">
					<a href="#" class="menu__link">Spring</a>
					<a href="#" class="menu__link">Summer</a>
					<a href="#" class="menu__link">Autumn</a>
					<a href="#" class="menu__link">Winter</a>
				</nav>
			</div>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.18.2/TweenMax.min.js'></script><script  src="./script.js"></script>

</body>
</html>

CSS

JS

{
    const body = document.body;
    const docEl = document.documentElement;

const lineEq = (y2, y1, x2, x1, currentVal) => {
        // y = mx + b 
        var m = (y2 - y1) / (x2 - x1), b = y1 - m * x1;
        return m * currentVal + b;
    };

// The feDisplacementMap element
    const feDisplacementMapEl = document.querySelector('feDisplacementMap');

class Menu {
        constructor() {
            this.DOM = {
                // The SVG element
                svg: document.querySelector('svg.distort'),
                // The menu element
                menu: document.querySelector('nav.menu')
            };
            // The images (one per menu link)
            this.DOM.imgs = [...this.DOM.svg.querySelectorAll('g > image')];
            // The menu links
            this.DOM.menuLinks = [...this.DOM.menu.querySelectorAll('.menu__link')];
            // Mouse position
            this.mousePos = {x: winsize.width/2, y: winsize.height/2};
            // Last mouse positions (one to consider for the image translation movement, another for the scale value of the feDisplacementMap element)
            this.lastMousePos = {
                translation: {x: winsize.width/2, y: winsize.height/2},
                displacement: {x: 0, y: 0}
            };
            // feDisplacementMap scale value
            this.dmScale = 0;
            // Current menu link position
            this.current = -1;
            
            this.initEvents();
            requestAnimationFrame(() => this.render());
        }
        initEvents() {
            // Update mouse position
            window.addEventListener('mousemove', ev => this.mousePos = getMousePos(ev));

this.DOM.menuLinks.forEach((item, pos) => {
                // Create spans for each letter
                const letters = [...item.querySelectorAll('span')];

const mouseenterFn = () => {
                    // Hide the previous menu image.
                    if ( this.current !== -1 ) {
                       TweenMax.set(this.DOM.imgs[this.current], {opacity: 0});
                    }
                    // Update current.
                    this.current = pos;

// Now fade in the new image if we are entering the menu or just set the new image's opacity to 1 if switching between menu items.
                    if ( this.fade ) {
                        TweenMax.to(this.DOM.imgs[this.current], 0.5, {ease: Quad.easeOut, opacity: 1});
                        this.fade = false;
                    }
                    else {
                        TweenMax.set(this.DOM.imgs[this.current], {opacity: 1});
                    }
                    
                    // Letters effect
                    TweenMax.staggerTo(letters, 0.2, {
                        ease: Sine.easeInOut,
                        y: this.lastMousePos.translation.y < this.mousePos.y ? 30 : -30,
                        startAt: {opacity: 1, y: 0},
                        opacity: 0,
                        yoyo: true,
                        yoyoEase: Back.easeOut,
                        repeat: 1,
                        stagger: {
                            grid: [1,letters.length-1],
                            from: 'center',
                            amount: 0.12
                        }
                    });
                };
                item.addEventListener('mouseenter', mouseenterFn);
            });

requestAnimationFrame(() => this.render());
        }
    }

new Menu();
}

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