Image To Grid Transition

import { preloadImages, map } from './utils';
import { gsap } from 'gsap';
import { Flip } from 'gsap/Flip';
gsap.registerPlugin(Flip);

let winsize = {width: window.innerWidth, height: window.innerHeight};
window.addEventListener('resize', () => winsize = {width: window.innerWidth, height: window.innerHeight});

const DOM = {
    // the grid
    grid: document.querySelector('.grid'),
    // enter button
    enterCtrl: document.querySelector('.content__enter'),
    // back button
    backCtrl: document.querySelector('.button-back'),
    
    // initial image element that we want to move into the final grid
    contentItem: document.querySelector('.content__item-img'),
    // where to insert the initial image element when the grid is open
    gridItemTarget: document.querySelector('.grid__item--target'),
    // and when it's closed 
    gridItemOriginalTarget: document.querySelector('.content__item'),
    
    // initial title element spans
    contentTitleTexts: document.querySelectorAll('.content__item-title > span'),
    // grid title element spans
    gridTitleTexts: document.querySelectorAll('.grid__item--title > span'),
    
    // all grid items (except the .grid__item--target, .grid__item--back and grid__item--title)
    gridItems: document.querySelectorAll('.grid > .grid__item:not(.grid__item--target):not(.grid__item--title):not(.grid__item--back)'),
};

const animationSettings = {
    duration: 1,
    ease: 'expo.inOut'
};

const body = document.body;
// original bg color
const bgcolor = getComputedStyle(body).getPropertyValue('--color-bg');

let isAnimating = false;

// Calculates the position of an element when the element is [distanceDifference]px more far from the center of the page than it was previously
const getInitialPosition = (element, distanceDifference = 400) => {
    const elCenter = {x: element.offsetLeft + element.offsetWidth/2, y: element.offsetTop + element.offsetHeight/2};
    const angle = Math.atan2(Math.abs(winsize.height/2 - elCenter.y), Math.abs(winsize.width/2 - elCenter.x));
    
    let x = Math.abs(Math.cos(angle) * distanceDifference);
    let y = Math.abs(Math.sin(angle) * distanceDifference);
    
    return {
        x: elCenter.x < winsize.width/2 ? x*-1 : x,
        y: elCenter.y < winsize.height/2 ? y*-1 : y
    };
};

// Distance from the element's center point to the center of the page
const getDistance = element => {
    const elCenter = {x: element.offsetLeft + element.offsetWidth/2, y: element.offsetTop + element.offsetHeight/2};
    return Math.hypot(elCenter.x - winsize.width/2, elCenter.y - winsize.height/2);
}

// opens up the grid
const showGrid = () => {

    if ( isAnimating ) return;
    isAnimating = true;

    const tl = gsap.timeline({
        onComplete: () => {
            isAnimating = false;
        }
    })
    .addLabel('start', 0)
    // hide enter button
    .to(DOM.enterCtrl, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        opacity: 0,
        onComplete: () => gsap.set(DOM.enterCtrl, {pointerEvents: 'none'})
    }, 'start')
    // use the gsap Flip plugin to animate the main image to the grid
    .add(() => {

        DOM.grid.classList.add('grid--open');
    
        const imageState = Flip.getState(DOM.contentItem);
        DOM.gridItemTarget.appendChild(DOM.contentItem);
        Flip.from(imageState, {
            duration: animationSettings.duration,
            ease: animationSettings.ease,
        });
        
    }, 'start');

    for (let item of DOM.gridItems) {
        const {x,y} = getInitialPosition(item);
        const delay = map(getDistance(item), 0, 1000, 0, 0.4);
        
        tl
        // animate in the grid item's labels
        .to(item.querySelector('.oh__inner'), {
            duration: animationSettings.duration*1.7,
            ease: animationSettings.ease,
            startAt: {yPercent: 101},
            yPercent: 0,
            delay: delay,
        }, 'start')
        // Set the original positions of the grid items and animate them in
        // The position will be relative to the center of the page and outwards
        .set(item, {
            x: x,
            y: y,
            opacity: 0
        }, 'start')
        .to(item, {
            duration: animationSettings.duration,
            ease: 'expo',
            x: 0,
            y: 0,
            delay: delay,
            opacity: 1
        }, 'start+=0.4')
    }
    
    tl
    // Animate in the main image label
    .to(DOM.gridItemTarget.querySelector('.oh__inner'), {
        duration: animationSettings.duration*1.7,
        ease: animationSettings.ease,
        startAt: {yPercent: 101},
        yPercent: 0
    }, 'start')
    // Animate out the big title spans and animate in the small title spans
    .to(DOM.contentTitleTexts, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        yPercent: pos => pos%2 ? 100 : -100,
        opacity: 0
    }, 'start')
    .to(DOM.gridTitleTexts, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        startAt: {
            xPercent: pos => pos%2 ? 50 : -50,
            opacity: 0
        },
        xPercent: 0,
        opacity: 1
    }, 'start')
    // Animate the back button
    .to(DOM.backCtrl, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        startAt: {
            xPercent: 40,
            opacity: 0
        },
        xPercent: 0,
        opacity: 1
    }, 'start')
    // Animate the color of the page
    .to(body, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        backgroundColor: '#CDD1CD'
    }, 'start');

};

const hideGrid = () => {

    if ( isAnimating ) return;
    isAnimating = true;

    const tl = gsap.timeline({
        onComplete: () => {
            DOM.grid.classList.remove('grid--open');
            isAnimating = false;
        }
    })
    .addLabel('start', 0)
    .to(body, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        backgroundColor: bgcolor
    }, 'start')
    .to(DOM.gridItemTarget.querySelector('.oh__inner'), {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        yPercent: 101
    }, 'start');

    for (let item of DOM.gridItems) {
        const {x,y} = getInitialPosition(item);
        const delay = map(getDistance(item), 0, 1000, 0.4, 0);

        tl
        .to(item, {
            duration: animationSettings.duration,
            ease: animationSettings.ease,
            x: x,
            y: y,
            opacity: 0,
            delay: delay
        }, 'start')
        .to(item.querySelector('.oh__inner'), {
            duration: animationSettings.duration*.5,
            ease: animationSettings.ease,
            yPercent: 101,
            delay: delay,
        }, 'start')
    }

    tl
    .to(DOM.gridTitleTexts, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        xPercent: pos => pos%2 ? 50 : -50,
        opacity: 0
    }, 'start')
    .to(DOM.backCtrl, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        xPercent: 20,
        opacity: 0
    }, 'start')
    .to(DOM.contentTitleTexts, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        yPercent: 0,
        opacity: 1
    }, 'start+=0.4')
    .to(DOM.enterCtrl, {
        duration: animationSettings.duration,
        ease: animationSettings.ease,
        opacity: 1,
        onComplete: () => gsap.set(DOM.enterCtrl, {pointerEvents: 'auto'})
    }, 'start+=0.4')
    .add(() => {

        const imageState = Flip.getState(DOM.contentItem);
        DOM.gridItemOriginalTarget.appendChild(DOM.contentItem);
        Flip.from(imageState, {
            duration: animationSettings.duration,
            ease: animationSettings.ease,
        });
        
    }, 'start+=0.4');

};

DOM.enterCtrl.addEventListener('click', () => showGrid());
DOM.backCtrl.addEventListener('click', () => hideGrid());

// Preload images
preloadImages('.grid__item-img').then( _ => document.body.classList.remove('loading'));

const imagesLoaded = require('imagesloaded');

/**
 * Map number x from range [a, b] to [c, d] 
 * @param {Number} x - changing value
 * @param {Number} a 
 * @param {Number} b
 * @param {Number} c
 * @param {Number} d
 */
const map = (x, a, b, c, d) => (x - a) * (d - c) / (b - a) + c;

/**
 * Preload images
 * @param {String} selector - Selector/scope from where images need to be preloaded. Default is 'img'
 */
const preloadImages = (selector = 'img') => {
    return new Promise((resolve) => {
        imagesLoaded(document.querySelectorAll(selector), {background: true}, resolve);
    });
};

export {
    map,
    preloadImages
};

README.md
## Credits

- Images from [Unsplash](https://unsplash.com/)


## License
[MIT](LICENSE)

Made with :blue_heart:  by [Codrops](http://www.codrops.com)

MIT License

Copyright (c) 2009 - 2021 [Codrops](https://tympanus.net/codrops)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

GSAP standard license snapshot
Source: https://gsap.com/community/standard-license/
Retrieved: 2026-09-22T04:22:49.089Z
Original distribution copyright and version headers remain in the runtime code.

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 Effective date: April 30, 2025

 Last modified date: May 30, 2025

 Copyright (©) 2025, Webflow


ev-emitter@2.1.2 — LICENSE.md
Copyright (c) 2016-2021 [David DeSandro](https://desandro.com)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


imagesloaded@5.0.0 — LICENSE.md
Copyright (c) 2011-2022 [David DeSandro](https://desandro.com) and [contributors](https://github.com/desandro/imagesloaded/graphs/contributors)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.