一款基于javascript的3D玻璃破碎特效

之前为大家介绍了一款 html5 canvas实现图片玻璃碎片特效。今天要给大家带来一款基于javascript的3D玻璃破碎特效。效果图如下：

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html代码：

<div id="container">
        <div id="fragment">
        </div>
    </div>

css代码：

 body
        {
            background-color: #f1f1f1;
            margin: 0;
            overflow: hidden;
        }
        
        #container
        {
            position: absolute;
            width: 384px;
            height: 384px;
            margin: auto;
            left: 0;
            top: 0;
            bottom: 0;
            right: 0;
        }
        
        .fragment
        {
            position: absolute;
            width: 48px;
            height: 48px;
        }

javascript代码：

    function init() {
    const FRAG_SIZE = 48;

    var defaultEase = Sine.easeOut;

    var container = document.getElementById('container'),
        containerRect = container.getBoundingClientRect(),
        fragments = [],
        centerX = 192,
        centerY = 192;

    TweenMax.set(container, {
       perspective:600
    });

    createFragments();
    createTweens();
    startUpdateLoop();

    function createFragments() {
        var fragment;

        for (var i = 0; i < 8; i++) {
            for (var j = 0; j < 8; j++) {
                fragment = document.createElement('div');
                fragment.className = 'fragment';

                TweenMax.set(fragment, {
                    x:j * FRAG_SIZE,
                    y:i * FRAG_SIZE
                });

                container.appendChild(fragment);
                fragments.push(fragment);
            }
        }
    }

    function createTweens() {
        var tl = new TimelineMax({repeat:-1}),
            fragment,
            delay;

        for (var i = 0; i < fragments.length; i++) {
            fragment = fragments[i];
            delay = 1 - (i % 8) * randomRange(0.04, 0.06);

            if (i < 32) {

                if (i === 0) {
                    tl.insert(createSpecialTween(fragment), delay);
                }
                else {
                    tl.insert(createArcTween(fragment), delay);
                }
                console.log('d1', delay);
            }
            else {
                tl.insert(createStraightTween(fragment), delay);
                console.log('d2', delay);
            }
        }
    }

    function createSpecialTween(fragment) {
        var bezierPoints = [
                {x:centerX - 24, y:-256},
                {x:centerX - 24, y:centerY - 24}
            ];

        var tl = new TimelineMax(),
            tween1 = TweenMax.to(fragment, 1.2, {
                bezier:{type:'soft', values:bezierPoints},
                ease:defaultEase
            }),
            tween2 = TweenMax.to(fragment, 1.2, {
                z:525,
                rotationX:360,
                rotationY:360,
                ease:defaultEase
            });

        tl.insert(tween1);
        tl.insert(tween2);

        return tl;
    }

    function createArcTween(fragment) {
        var dx = (centerX - fragment._gsTransform.x - 24),
            dy = (centerY - fragment._gsTransform.y - 24);

        var bezierPoints = [
            {x:fragment._gsTransform.x, y:fragment._gsTransform.y - dy},
            {x:fragment._gsTransform.x, y:containerRect.bottom}
        ];

        var tl = new TimelineMax(),
            tween1 = TweenMax.to(fragment, randomRange(3.2, 3.1), {
                bezier:{values:bezierPoints},
                ease:defaultEase
            }),
            tween2 = TweenMax.to(fragment, randomRange(3.2, 3.1), {
                z:randomRange(800, 1000),
                rotationX:randomRange(360, 1080),
                rotationY:randomRange(360, 1080),
                ease:defaultEase
            });

        tl.insert(tween1);
        tl.insert(tween2);

        return tl;
    }

    function createStraightTween(fragment) {
        var dx = (centerX - fragment._gsTransform.x - 24) * 4;

        return TweenMax.to(fragment, randomRange(3, 3.1), {
            x:-dx,
            y:window.innerHeight + containerRect.bottom + randomRange(0, 124),
            z:randomRange(300, 500) * (Math.random() > 0.5 ? 1 : -1),
            rotationX:randomRange(360, 1080),
            rotationY:randomRange(360, 1080),
            ease:defaultEase
        })
    }

    function startUpdateLoop() {
        requestAnimationFrame(tick);

        function tick() {
            var fragment,
                angleX,
                angleY;

            for (var i = 0; i < fragments.length; i++) {
                fragment = fragments[i];

                angleX = Math.abs(fragment._gsTransform.rotationX % 180 - 90) / 180;
                angleY = Math.abs(fragment._gsTransform.rotationY % 180 - 90) / 180;

                var l = Math.round((angleX + angleY) / 2 * 100);
                fragment.style.backgroundColor = 'hsl(30,100%,' + l + '%)';
                fragment.style.zIndex = Math.round(fragment._gsTransform.z);
            }

            requestAnimationFrame(tick);
        }
    }

    function randomRange(min, max) {
        return min + Math.random() * (max - min);
    }
}

window.onload = init;//@ sourceURL=pen.js

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