阴影聚光灯

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html

css

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html

css

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: black;
    color: #666;
    font-family: sans-serif;
    font-size: 16px;
    overscroll-behavior: none;
    
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
}

#container {
    width: 90vw;
    height: 90vh;
}

#title {
    text-align: center;
    width: 100%;
    padding: 10px 0 10px 0;
}

#box {
    position: relative;
    width: 100%;
    height: 100%;
    background: #666;
    overflow: hidden;
    /*cursor: none;*/
    border: 1px solid #333;
    
    -webkit-tap-highlight-color: rgba(0,0,0,0);
	-webkit-user-select: none;
}

.shadow__wall {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
}

#shadow__text {
    position: absolute;
    width: 100%;
    margin: 0;
    color: #999;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 5rem;
    font-weight: bold;
    text-align: center;
    white-space: nowrap;
}

.shadow__box {
    position: absolute;
    background: #999;
    top: 4.5rem;
    height: 50vh;
}

#shadow__box--back {
    left: -5%;
    width: 110%;
}

#shadow__box--front {
    left: 0;
    width: 100%;
}

#shadow__spot {
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: -webkit-gradient(radial, center center, 0, center center, 250, from(rgba(0,0,0,0)), to(rgba(0,0,0,1)));
}

JavaScript

const textElem = document.querySelector('#shadow__text');
const spotElem = document.querySelector('#shadow__spot');
const boxElem = document.querySelector('#shadow__box--back');

const container = document.querySelector('#box');
var width = container.offsetWidth;
var height = container.offsetHeight;

function updateSize(e) {
    width = container.offsetWidth;
    height = container.offsetHeight;
    relMousePos.setOrigin(container);
    
    onMouseMove({clientX: relMousePos._x, clientY: relMousePos._y + 25});
}

function updateTime() {
    let date = new Date();
    let time = date.toLocaleTimeString();
    textElem.innerText = time;
    
    setTimeout(updateTime, 1000);
}

function onMouseMove(e) {
    relMousePos.updatePos(e);
    
    var xm = relMousePos.x;
    var ym = relMousePos.y;

var d = Math.round(Math.sqrt(xm*xm + ym*ym) / 10);
    textElem.style.textShadow = -xm + 'px ' + -ym + 'px ' + (d + 10) + 'px black';    
    boxElem.style.boxShadow = '0 ' + -ym + 'px ' + (d + 30) + 'px black';    
    spotElem.style.backgroundPosition = (xm - (width / 2)) + 'px ' + (ym - (height / 2)) + 'px';
}

document.addEventListener('resize', updateSize);
document.addEventListener('DOMContentLoaded', init);

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