JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

Any URL's added here will be added as `<script>`

s in order, and run *before* the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

` ````
move mouse to change light
```

` ````
body, html {
background: #333;
font-family: sans-serif;
color: white;
}
```

` ````
const NUM = 10;
let win = $(window);
let mouseX = 0, mouseY = 0;
let boxes = [];
let up = function(i, max, fn) {
fn(i++);
if (i < max) up(i, max, fn);
};
let calcAng = function(x, y) {
let lightPos = light.position()
let dx = lightPos.left - x;
let dy = lightPos.top - y;
return -Math.atan2(dy, dx) / Math.PI * 180;
};
let calcDist = function(x, y) {
let lightPos = light.position()
let dx = lightPos.left - x;
let dy = lightPos.top - y;
return Math.sqrt(dx * dx, dy * dy);
};
let calcShade = function(x, y) {
let angle = calcAng(x, y);
let dist = calcDist(x, y);
let sx = dist * Math.cos(-angle * Math.PI / 180) * -1;
let sy = dist * Math.sin(-angle * Math.PI / 180) * -1;
sx = Math.min(20, Math.max(sx, -20));
sy = Math.min(20, Math.max(sy, -20));
let blur = Math.min(100, dist);
let hBlur = Math.min(50, blur) * 0.5;
// consider distance in the eq?
return {
bg: `-webkit-linear-gradient(${angle}deg, rgba(0, 0, 0, 0.2), rgba(255, 255, 255, 0.4) ${blur}%)`,
shadow: `${sx}px ${sy}px ${hBlur}px rgba(0, 0, 0, 0.15)`
};
};
let randomBox = function() {
let size = Math.random() * 200 + 50;
let params = {
size: size,
left: Math.random() * (win.width() - size),
top: 50 + Math.random() * (win.height() - size)
};
let shade = calcShade(params.left, params.top);
params.bg = shade.bg;
return box(params);
};
let box = function(p) {
let b = $('<div>', {
css: {
position: 'absolute',
left: p.left,
top: p.top,
width: p.size, height: p.size,
borderRadius: 4,
overflow: 'hidden',
border: '1px solid rgba(255, 255, 255, 0.5)'
}
}).appendTo('body');
let tex = $('<div>', {
'class': 'tex',
css: {
position: 'absolute',
left: 0,
top: 0,
width: '100%', height: '100%',
backgroundSize: 'cover',
background: 'url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/17496/joe.jpg)'
}
}).appendTo(b);
let light = $('<div>', {
'class': 'light',
css: {
position: 'absolute',
left: 0,
top: 0,
width: '100%', height: '100%',
// background: p.bg || 'gray',
zIndex: p.zIndex || 0,
// do this with the angle and distance somewhat
// boxShadow: '0 20px 50px rgba(0, 0, 0, 0.2)'
}
}).appendTo(b);
return b;
};
let light = box({
size: 10,
left: win.width() * 0.5,
top: win.height() * 0.5,
zIndex: 100
});
up(0, NUM, function(i) {
boxes.push(randomBox());
});
$(document).on('mousemove', function(e) {
mouseX = e.pageX;
mouseY = e.pageY;
});
setInterval(function() {
light.css({
left: mouseX,
top: mouseY
});
boxes.forEach(function(item) {
let rect = item[0].getBoundingClientRect();
let css = calcShade(
rect.left + rect.width / 2,
rect.top + rect.height / 2
);
item.css({
boxShadow: css.shadow
});
item.find('.light').css({
background: css.bg
});
});
}, 16);
```

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