Северное сияние на фон. CSS, JS?

#javascript #html5 #css3 #background #эффекты

Задумка сделать фоном переливающееся северное сияние или что-то на подобие (именно
фоном, не эффект текста). Мои познания в JS слишком скудны, чтоб написать такой скрипт
самому.
Подскажите, может кто встречал что-то подобное?
    

Ответы

Ответ 1

Это легко гуглится.
Но раз тут не любят вгуглпосылателей, то вот:

Не особо впечатляет, но...


.bubble {
    
  width: 500px;
  height: 500px;

  position: absolute;
  border-radius: 500px;
  -webkit-filter: blur(200px);
  -webkit-animation: pulse 2s alternate infinite;

}

.bubble-blue {

    background: blue;
  
}

.bubble-yellow {

  background: yellow;
  
}

.bubble-red {
  background: red;
}

.bubble-green {
  background: green;
}

.bubble-purple {
  background: purple;
}

@-webkit-keyframes pulse
{
from {-webkit-filter:  blur(200px) opacity(0%);}
to {-webkit-filter:  blur(250px) opacity(100%);}
}













http://codepen.io/JoJoZ/pen/YymvQr



Halm + SCSS:
https://codepen.io/insprd/pen/Hjsye/





// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough banksean@gmail.com
//
// Added 4D noise
// Joshua Koo zz85nus@gmail.com 

/**
 * You can pass in a random number generator object if you like.
 * It is assumed to have a random() method.
 */
var SimplexNoise = function(r) {
	if (r == undefined) r = Math;
  this.grad3 = [[1,1,0],[-1,1,0],[1,-1,0],[-1,-1,0], 
                                 [1,0,1],[-1,0,1],[1,0,-1],[-1,0,-1], 
                                 [0,1,1],[0,-1,1],[0,1,-1],[0,-1,-1]]; 

  this.grad4 = [[0,1,1,1], [0,1,1,-1], [0,1,-1,1], [0,1,-1,-1],
	     [0,-1,1,1], [0,-1,1,-1], [0,-1,-1,1], [0,-1,-1,-1],
	     [1,0,1,1], [1,0,1,-1], [1,0,-1,1], [1,0,-1,-1],
	     [-1,0,1,1], [-1,0,1,-1], [-1,0,-1,1], [-1,0,-1,-1],
	     [1,1,0,1], [1,1,0,-1], [1,-1,0,1], [1,-1,0,-1],
	     [-1,1,0,1], [-1,1,0,-1], [-1,-1,0,1], [-1,-1,0,-1],
	     [1,1,1,0], [1,1,-1,0], [1,-1,1,0], [1,-1,-1,0],
	     [-1,1,1,0], [-1,1,-1,0], [-1,-1,1,0], [-1,-1,-1,0]];

  this.p = [];
  for (var i=0; i<256; i++) {
	  this.p[i] = Math.floor(r.random()*256);
  }
  // To remove the need for index wrapping, double the permutation table length 
  this.perm = []; 
  for(var i=0; i<512; i++) {
		this.perm[i]=this.p[i & 255];
	} 

  // A lookup table to traverse the simplex around a given point in 4D. 
  // Details can be found where this table is used, in the 4D noise method. 
  this.simplex = [ 
    [0,1,2,3],[0,1,3,2],[0,0,0,0],[0,2,3,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,2,3,0], 
    [0,2,1,3],[0,0,0,0],[0,3,1,2],[0,3,2,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,3,2,0], 
    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], 
    [1,2,0,3],[0,0,0,0],[1,3,0,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,3,0,1],[2,3,1,0], 
    [1,0,2,3],[1,0,3,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,0,3,1],[0,0,0,0],[2,1,3,0], 
    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], 
    [2,0,1,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,0,1,2],[3,0,2,1],[0,0,0,0],[3,1,2,0], 
    [2,1,0,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,1,0,2],[0,0,0,0],[3,2,0,1],[3,2,1,0]]; 
};

SimplexNoise.prototype.dot = function(g, x, y) { 
	return g[0]*x + g[1]*y;
};

SimplexNoise.prototype.noise = function(xin, yin) { 
  var n0, n1, n2; // Noise contributions from the three corners 
  // Skew the input space to determine which simplex cell we're in 
  var F2 = 0.5*(Math.sqrt(3.0)-1.0); 
  var s = (xin+yin)*F2; // Hairy factor for 2D 
  var i = Math.floor(xin+s); 
  var j = Math.floor(yin+s); 
  var G2 = (3.0-Math.sqrt(3.0))/6.0; 
  var t = (i+j)*G2; 
  var X0 = i-t; // Unskew the cell origin back to (x,y) space 
  var Y0 = j-t; 
  var x0 = xin-X0; // The x,y distances from the cell origin 
  var y0 = yin-Y0; 
  // For the 2D case, the simplex shape is an equilateral triangle. 
  // Determine which simplex we are in. 
  var i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords 
  if(x0>y0) {i1=1; j1=0;} // lower triangle, XY order: (0,0)->(1,0)->(1,1) 
  else {i1=0; j1=1;}      // upper triangle, YX order: (0,0)->(0,1)->(1,1) 
  // A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and 
  // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where 
  // c = (3-sqrt(3))/6 
  var x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords 
  var y1 = y0 - j1 + G2; 
  var x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords 
  var y2 = y0 - 1.0 + 2.0 * G2; 
  // Work out the hashed gradient indices of the three simplex corners 
  var ii = i & 255; 
  var jj = j & 255; 
  var gi0 = this.perm[ii+this.perm[jj]] % 12; 
  var gi1 = this.perm[ii+i1+this.perm[jj+j1]] % 12; 
  var gi2 = this.perm[ii+1+this.perm[jj+1]] % 12; 
  // Calculate the contribution from the three corners 
  var t0 = 0.5 - x0*x0-y0*y0; 
  if(t0<0) n0 = 0.0; 
  else { 
    t0 *= t0; 
    n0 = t0 * t0 * this.dot(this.grad3[gi0], x0, y0);  // (x,y) of grad3 used for
2D gradient 
  } 
  var t1 = 0.5 - x1*x1-y1*y1; 
  if(t1<0) n1 = 0.0; 
  else { 
    t1 *= t1; 
    n1 = t1 * t1 * this.dot(this.grad3[gi1], x1, y1); 
  }
  var t2 = 0.5 - x2*x2-y2*y2; 
  if(t2<0) n2 = 0.0; 
  else { 
    t2 *= t2; 
    n2 = t2 * t2 * this.dot(this.grad3[gi2], x2, y2); 
  } 
  // Add contributions from each corner to get the final noise value. 
  // The result is scaled to return values in the interval [-1,1]. 
  return 70.0 * (n0 + n1 + n2); 
};

// 3D simplex noise 
SimplexNoise.prototype.noise3d = function(xin, yin, zin) { 
  var n0, n1, n2, n3; // Noise contributions from the four corners 
  // Skew the input space to determine which simplex cell we're in 
  var F3 = 1.0/3.0; 
  var s = (xin+yin+zin)*F3; // Very nice and simple skew factor for 3D 
  var i = Math.floor(xin+s); 
  var j = Math.floor(yin+s); 
  var k = Math.floor(zin+s); 
  var G3 = 1.0/6.0; // Very nice and simple unskew factor, too 
  var t = (i+j+k)*G3; 
  var X0 = i-t; // Unskew the cell origin back to (x,y,z) space 
  var Y0 = j-t; 
  var Z0 = k-t; 
  var x0 = xin-X0; // The x,y,z distances from the cell origin 
  var y0 = yin-Y0; 
  var z0 = zin-Z0; 
  // For the 3D case, the simplex shape is a slightly irregular tetrahedron. 
  // Determine which simplex we are in. 
  var i1, j1, k1; // Offsets for second corner of simplex in (i,j,k) coords 
  var i2, j2, k2; // Offsets for third corner of simplex in (i,j,k) coords 
  if(x0>=y0) { 
    if(y0>=z0) 
      { i1=1; j1=0; k1=0; i2=1; j2=1; k2=0; } // X Y Z order 
      else if(x0>=z0) { i1=1; j1=0; k1=0; i2=1; j2=0; k2=1; } // X Z Y order 
      else { i1=0; j1=0; k1=1; i2=1; j2=0; k2=1; } // Z X Y order 
    } 
  else { // x0 y0) ? 32 : 0;
   var c2 = (x0 > z0) ? 16 : 0;
   var c3 = (y0 > z0) ? 8 : 0;
   var c4 = (x0 > w0) ? 4 : 0;
   var c5 = (y0 > w0) ? 2 : 0;
   var c6 = (z0 > w0) ? 1 : 0;
   var c = c1 + c2 + c3 + c4 + c5 + c6;
   var i1, j1, k1, l1; // The integer offsets for the second simplex corner
   var i2, j2, k2, l2; // The integer offsets for the third simplex corner
   var i3, j3, k3, l3; // The integer offsets for the fourth simplex corner
   // simplex[c] is a 4-vector with the numbers 0, 1, 2 and 3 in some order.
   // Many values of c will never occur, since e.g. x>y>z>w makes x=3 ? 1 : 0;
   j1 = simplex[c][1]>=3 ? 1 : 0;
   k1 = simplex[c][2]>=3 ? 1 : 0;
   l1 = simplex[c][3]>=3 ? 1 : 0;
   // The number 2 in the "simplex" array is at the second largest coordinate.
   i2 = simplex[c][0]>=2 ? 1 : 0;
   j2 = simplex[c][1]>=2 ? 1 : 0;    k2 = simplex[c][2]>=2 ? 1 : 0;
   l2 = simplex[c][3]>=2 ? 1 : 0;
   // The number 1 in the "simplex" array is at the second smallest coordinate.
   i3 = simplex[c][0]>=1 ? 1 : 0;
   j3 = simplex[c][1]>=1 ? 1 : 0;
   k3 = simplex[c][2]>=1 ? 1 : 0;
   l3 = simplex[c][3]>=1 ? 1 : 0;
   // The fifth corner has all coordinate offsets = 1, so no need to look that up.
   var x1 = x0 - i1 + G4; // Offsets for second corner in (x,y,z,w) coords
   var y1 = y0 - j1 + G4;
   var z1 = z0 - k1 + G4;
   var w1 = w0 - l1 + G4;
   var x2 = x0 - i2 + 2.0*G4; // Offsets for third corner in (x,y,z,w) coords
   var y2 = y0 - j2 + 2.0*G4;
   var z2 = z0 - k2 + 2.0*G4;
   var w2 = w0 - l2 + 2.0*G4;
   var x3 = x0 - i3 + 3.0*G4; // Offsets for fourth corner in (x,y,z,w) coords
   var y3 = y0 - j3 + 3.0*G4;
   var z3 = z0 - k3 + 3.0*G4;
   var w3 = w0 - l3 + 3.0*G4;
   var x4 = x0 - 1.0 + 4.0*G4; // Offsets for last corner in (x,y,z,w) coords
   var y4 = y0 - 1.0 + 4.0*G4;
   var z4 = z0 - 1.0 + 4.0*G4;
   var w4 = w0 - 1.0 + 4.0*G4;
   // Work out the hashed gradient indices of the five simplex corners
   var ii = i & 255;
   var jj = j & 255;
   var kk = k & 255;
   var ll = l & 255;
   var gi0 = perm[ii+perm[jj+perm[kk+perm[ll]]]] % 32;
   var gi1 = perm[ii+i1+perm[jj+j1+perm[kk+k1+perm[ll+l1]]]] % 32;
   var gi2 = perm[ii+i2+perm[jj+j2+perm[kk+k2+perm[ll+l2]]]] % 32;
   var gi3 = perm[ii+i3+perm[jj+j3+perm[kk+k3+perm[ll+l3]]]] % 32;
   var gi4 = perm[ii+1+perm[jj+1+perm[kk+1+perm[ll+1]]]] % 32;
   // Calculate the contribution from the five corners
   var t0 = 0.6 - x0*x0 - y0*y0 - z0*z0 - w0*w0;
   if(t0<0) n0 = 0.0;
   else {
     t0 *= t0;
     n0 = t0 * t0 * this.dot(grad4[gi0], x0, y0, z0, w0);
   }
  var t1 = 0.6 - x1*x1 - y1*y1 - z1*z1 - w1*w1;
   if(t1<0) n1 = 0.0;
   else {
     t1 *= t1;
     n1 = t1 * t1 * this.dot(grad4[gi1], x1, y1, z1, w1);
   }
  var t2 = 0.6 - x2*x2 - y2*y2 - z2*z2 - w2*w2;
   if(t2<0) n2 = 0.0;
   else {
     t2 *= t2;
     n2 = t2 * t2 * this.dot(grad4[gi2], x2, y2, z2, w2);
   }   var t3 = 0.6 - x3*x3 - y3*y3 - z3*z3 - w3*w3;
   if(t3<0) n3 = 0.0;
   else {
     t3 *= t3;
     n3 = t3 * t3 * this.dot(grad4[gi3], x3, y3, z3, w3);
   }
  var t4 = 0.6 - x4*x4 - y4*y4 - z4*z4 - w4*w4;
   if(t4<0) n4 = 0.0;
   else {
     t4 *= t4;
     n4 = t4 * t4 * this.dot(grad4[gi4], x4, y4, z4, w4);
   }
   // Sum up and scale the result to cover the range [-1,1]
   return 27.0 * (n0 + n1 + n2 + n3 + n4);
};




/* PolyFill http://paulirish.com/2011/requestanimationframe-for-smart-animating/ */
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = 
          window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());






var context;
var simplex = new SimplexNoise();

/* zz85 aka @blurspline */
/* CPU Based method here*/
/* For GLSL version see http://glsl.heroku.com/e#812.1 */
function createCloudTexture(width, height) {
	var canvas = document.createElement("canvas");
	canvas.width = width;
	canvas.height = height;
	
	context = canvas.getContext('2d');
	
	
	document.body.appendChild(canvas);
	
	this.redraw = function() {
		var now = Date.now();
		var time = now / 8000;
		
		context.clearRect(0, 0, width, height);
		var gradient = context.createLinearGradient( 0,  (Math.sin(time / 2)+1) * 0.5 *
height, width, height - (Math.sin(time / 2)+1) * 0.5* height  );

		gradient.addColorStop( 0, 'rgba(200,200,0,0.9)' );
		gradient.addColorStop( (Math.sin(time)+1) * 0.5 * 0.2, 'rgba(100,0,0,1)' );
		
		gradient.addColorStop( (Math.cos(time)+1) * 0.5 * 0.2 + 0.4 , 'rgba(0,200,0,1)'
); // 0.6
		gradient.addColorStop( 0.8, 'rgba(0,0,200,1)' );
		gradient.addColorStop( 1, 'rgba(200,200,200,1)' );

		context.fillStyle = gradient;
		
		context.fillRect(0,0, width, height);
		
		context.save();
		context.globalCompositeOperation = 'lighter';
		var gradient = context.createLinearGradient( 0, 0, 0, height );
		gradient.addColorStop( 0, 'rgba(0,0,0,0.2)' );
		gradient.addColorStop( 1, 'rgba(200,200,200,0.5)' );
		
		
		context.fillStyle = gradient;
		context.fillRect(0,0, width, height);
		
		context.restore();
		
		var image = context.createImageData( width, height );
		var image2 = context.getImageData( 0, 0, width, height );
		
		var imageData = image.data;
		var imageData2 = image2.data;
		
		
		var w,h, n;
		
		// settings
		var octaves = 2;				
		var scaleX = 4 /octaves, scaleY = 0.25 /octaves;
		
		for ( var i = 0, j = 0, l = imageData.length; i < l; i += 4, j ++  ) {
		
			h = Math.floor( j/width );
			w = j % width;
		
			n = 0;
			var frequency = 1;
			var persistance = 0.5;
			var amptitude ;
		
			for (var oi=0; oi < octaves; oi++) {
				frequency *= 2;
				amptitude =  Math.pow(persistance, oi);
			
				n += simplex.noise3d(w/width * frequency * scaleX, h/height* frequency * scaleY,
time)  * amptitude ;
			}

		
			var m = n;
			var factor = n* 0.5 + 0.5; // + 1 ) * 0.5
			n = Math.floor( factor * 255); //Math.floor
		

			// Multiply ** (best!!!)
			imageData[ i ] = Math.floor( factor * imageData2[ i ]);
			imageData[ i + 1 ] = Math.floor( factor * imageData2[ i + 1]);
			imageData[ i + 2 ] = Math.floor( factor * imageData2[ i + 2 ]);
			imageData[ i + 3 ] = 255;
			


		}
		context.putImageData( image, 0, 0 );
		
		//console.log('done', Date.now() - now);

	}
	
	this.redraw();
	
	return this;
}

// var canvas = createCloudTexture(800, 600)
var canvas = createCloudTexture(465, 465)
animate();


function animate() {

	requestAnimationFrame( animate );
	render();

}

function render() {
	canvas.redraw();
}
body { background-color: #DDDDDD; font: 30px sans-serif; }
canvas { margin: auto; }



http://jsdo.it/zz85/r8vv





/* Meyer Reset */
html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,font,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td{font-family:
"Lucida Grande", Lucida, Verdana, sans-serif;margin:0;padding:0;border:0;outline:0;font-size:100%;vertical-align:baseline;background:transparent}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:'';content:none}:focus{outline:0}ins{text-decoration:none}del{text-decoration:line-through}table{border-collapse:collapse;border-spacing:0}	

html
{
	background: #000 url(https://jedidiah.eu/code/css/masks/aurora_borealis/sky.jpg)
repeat-x top center;
}
.wavey
{
	/* Make the hidden image fit to the full window to match the background on the html
element */
	position:fixed;
	top:0; right:0; bottom:0; left:0;
	opacity:0.8;
	
	/* Set the background */
	background: transparent url(https://jedidiah.eu/code/css/masks/aurora_borealis/lines.jpg)
repeat top left;
	
	/* Set the mask (uses the same properties as background) */
	-webkit-mask-image: url(https://jedidiah.eu/code/css/masks/aurora_borealis/wavey4.png);
	-webkit-mask-repeat:repeat-y;
	
	-webkit-animation-name: pulsed;
	-webkit-animation-duration: 1000s;
	-webkit-animation-timing-function: linear;
	-webkit-animation-iteration-count: infinite;
	
}
.waveyecho
{
	/* Make the hidden image fit to the full window to match the background on the html
element */
	position:fixed;
	top:0; right:0; bottom:0; left:0;
	
	/* Set the background */
	background: transparent url(https://jedidiah.eu/code/css/masks/aurora_borealis/lines.jpg)
repeat top left;
	opacity:0.5;
	
	/* Set the mask (uses the same properties as background) */
	-webkit-mask-image: url(https://jedidiah.eu/code/css/masks/aurora_borealis/wavey3.png);
	-webkit-mask-repeat:repeat-y;
	
	-webkit-animation-name: pulsedecho;
	-webkit-animation-duration: 1000s;
	-webkit-animation-timing-function: linear;
	-webkit-animation-iteration-count: infinite;
	
}

#pulsed
{
	/* Make the hidden image fit to the full window to match the background on the html
element */
	position:fixed;
	top:0; right:0; bottom:0; left:0;
	
	/* Set the background */
	
	/* Set the mask (uses the same properties as background) */
	-webkit-mask-image: url(https://jedidiah.eu/code/css/masks/aurora_borealis/fade.png);
	-webkit-mask-repeat:repeat-x;
	
}

@-webkit-keyframes pulsed {
	0% { -webkit-mask-position: 0px -5000px; background-position: 1% 1%; }
	50% { -webkit-mask-position: -500px 5000px; background-position: -1000% 1%; }
	100% { -webkit-mask-position: 0px 15000px; background-position: -3000% 1%; }
}

@-webkit-keyframes pulsedecho {
	0% { -webkit-mask-position: 0px 20000px; background-position: -1000% 1%; }
	50% { -webkit-mask-position: -500px 15000px; background-position: 0% 1%; }
	100% { -webkit-mask-position: 0px 0px; background-position: -1000% 1%; }
}

  

  





https://jedidiah.eu/code/css/masks/aurora_borealis/

При желании, можно найти ещё.