As used in production on Bloomberg's Best Books of 2015.
Largely derived from FizzyText (seen here, source here, my attempted explanation here).
As used in production on Bloomberg's Best Books of 2015.
Largely derived from FizzyText (seen here, source here, my attempted explanation here).
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// http://mrl.nyu.edu/~perlin/noise/ | |
var ImprovedNoise = function () { | |
var p = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10, | |
23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87, | |
174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211, | |
133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208, | |
89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5, | |
202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119, | |
248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232, | |
178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249, | |
14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205, | |
93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180]; | |
for ( var i = 0; i < 256 ; i++ ) { | |
p[ 256 + i ] = p[ i ]; | |
} | |
function fade( t ) { | |
return t * t * t * ( t * ( t * 6 - 15 ) + 10 ); | |
} | |
function lerp( t, a, b ) { | |
return a + t * ( b - a ); | |
} | |
function grad( hash, x, y, z ) { | |
var h = hash & 15; | |
var u = h < 8 ? x : y, v = h < 4 ? y : h == 12 || h == 14 ? x : z; | |
return ( ( h & 1 ) == 0 ? u : -u ) + ( ( h & 2 ) == 0 ? v : -v ); | |
} | |
return { | |
noise: function ( x, y, z ) { | |
var floorX = Math.floor( x ), floorY = Math.floor( y ), floorZ = Math.floor( z ); | |
var X = floorX & 255, Y = floorY & 255, Z = floorZ & 255; | |
x -= floorX; | |
y -= floorY; | |
z -= floorZ; | |
var xMinus1 = x -1, yMinus1 = y - 1, zMinus1 = z - 1; | |
var u = fade( x ), v = fade( y ), w = fade( z ); | |
var A = p[ X ] + Y, AA = p[ A ] + Z, AB = p[ A + 1 ] + Z, B = p[ X + 1 ] + Y, BA = p[ B ] + Z, BB = p[ B + 1 ] + Z; | |
return lerp( w, lerp( v, lerp( u, grad( p[ AA ], x, y, z ), | |
grad( p[ BA ], xMinus1, y, z ) ), | |
lerp( u, grad( p[ AB ], x, yMinus1, z ), | |
grad( p[ BB ], xMinus1, yMinus1, z ) ) ), | |
lerp( v, lerp( u, grad( p[ AA + 1 ], x, y, zMinus1 ), | |
grad( p[ BA + 1 ], xMinus1, y, z - 1 ) ), | |
lerp( u, grad( p[ AB + 1 ], x, yMinus1, zMinus1 ), | |
grad( p[ BB + 1 ], xMinus1, yMinus1, zMinus1 ) ) ) ); | |
} | |
} | |
} | |
var currentRandom = Math.random; | |
// Pseudo-random generator | |
function Marsaglia(i1, i2) { | |
// from http://www.math.uni-bielefeld.de/~sillke/ALGORITHMS/random/marsaglia-c | |
var z=i1 || 362436069, w= i2 || 521288629; | |
var nextInt = function() { | |
z=(36969*(z&65535)+(z>>>16)) & 0xFFFFFFFF; | |
w=(18000*(w&65535)+(w>>>16)) & 0xFFFFFFFF; | |
return (((z&0xFFFF)<<16) | (w&0xFFFF)) & 0xFFFFFFFF; | |
}; | |
this.nextDouble = function() { | |
var i = nextInt() / 4294967296; | |
return i < 0 ? 1 + i : i; | |
}; | |
this.nextInt = nextInt; | |
} | |
Marsaglia.createRandomized = function() { | |
var now = new Date(); | |
return new Marsaglia((now / 60000) & 0xFFFFFFFF, now & 0xFFFFFFFF); | |
}; | |
// Noise functions and helpers | |
function PerlinNoise(seed) { | |
var rnd = seed !== undefined ? new Marsaglia(seed) : Marsaglia.createRandomized(); | |
var i, j; | |
// http://www.noisemachine.com/talk1/17b.html | |
// http://mrl.nyu.edu/~perlin/noise/ | |
// generate permutation | |
var p = new Array(512); | |
for(i=0;i<256;++i) { p[i] = i; } | |
for(i=0;i<256;++i) { var t = p[j = rnd.nextInt() & 0xFF]; p[j] = p[i]; p[i] = t; } | |
// copy to avoid taking mod in p[0]; | |
for(i=0;i<256;++i) { p[i + 256] = p[i]; } | |
function grad3d(i,x,y,z) { | |
var h = i & 15; // convert into 12 gradient directions | |
var u = h<8 ? x : y, | |
v = h<4 ? y : h===12||h===14 ? x : z; | |
return ((h&1) === 0 ? u : -u) + ((h&2) === 0 ? v : -v); | |
} | |
function grad2d(i,x,y) { | |
var v = (i & 1) === 0 ? x : y; | |
return (i&2) === 0 ? -v : v; | |
} | |
function grad1d(i,x) { | |
return (i&1) === 0 ? -x : x; | |
} | |
function lerp(t,a,b) { return a + t * (b - a); } | |
this.noise3d = function(x, y, z) { | |
var X = Math.floor(x)&255, Y = Math.floor(y)&255, Z = Math.floor(z)&255; | |
x -= Math.floor(x); y -= Math.floor(y); z -= Math.floor(z); | |
var fx = (3-2*x)*x*x, fy = (3-2*y)*y*y, fz = (3-2*z)*z*z; | |
var p0 = p[X]+Y, p00 = p[p0] + Z, p01 = p[p0 + 1] + Z, p1 = p[X + 1] + Y, p10 = p[p1] + Z, p11 = p[p1 + 1] + Z; | |
return lerp(fz, | |
lerp(fy, lerp(fx, grad3d(p[p00], x, y, z), grad3d(p[p10], x-1, y, z)), | |
lerp(fx, grad3d(p[p01], x, y-1, z), grad3d(p[p11], x-1, y-1,z))), | |
lerp(fy, lerp(fx, grad3d(p[p00 + 1], x, y, z-1), grad3d(p[p10 + 1], x-1, y, z-1)), | |
lerp(fx, grad3d(p[p01 + 1], x, y-1, z-1), grad3d(p[p11 + 1], x-1, y-1,z-1)))); | |
}; | |
this.noise2d = function(x, y) { | |
var X = Math.floor(x)&255, Y = Math.floor(y)&255; | |
x -= Math.floor(x); y -= Math.floor(y); | |
var fx = (3-2*x)*x*x, fy = (3-2*y)*y*y; | |
var p0 = p[X]+Y, p1 = p[X + 1] + Y; | |
return lerp(fy, | |
lerp(fx, grad2d(p[p0], x, y), grad2d(p[p1], x-1, y)), | |
lerp(fx, grad2d(p[p0 + 1], x, y-1), grad2d(p[p1 + 1], x-1, y-1))); | |
}; | |
this.noise1d = function(x) { | |
var X = Math.floor(x)&255; | |
x -= Math.floor(x); | |
var fx = (3-2*x)*x*x; | |
return lerp(fx, grad1d(p[X], x), grad1d(p[X+1], x-1)); | |
}; | |
} | |
function noiser(oct, fall) { | |
// these are lifted from Processing.js | |
// processing defaults | |
var noiseProfile = { | |
generator: undefined, | |
octaves: oct || 4, | |
fallout: fall || .8, | |
seed: undefined | |
}; | |
function noise(x, y, z) { | |
if(noiseProfile.generator === undefined) { | |
// caching | |
noiseProfile.generator = new PerlinNoise(noiseProfile.seed); | |
} | |
var generator = noiseProfile.generator; | |
var effect = 1, k = 1, sum = 0; | |
for(var i=0; i<noiseProfile.octaves; ++i) { | |
effect *= noiseProfile.fallout; | |
switch (arguments.length) { | |
case 1: | |
sum += effect * (1 + generator.noise1d(k*x))/2; break; | |
case 2: | |
sum += effect * (1 + generator.noise2d(k*x, k*y))/2; break; | |
case 3: | |
sum += effect * (1 + generator.noise3d(k*x, k*y, k*z))/2; break; | |
} | |
k *= 2; | |
} | |
return sum; | |
}; | |
return noise; | |
} |
<!doctype html> | |
<html> | |
<head> | |
<style> | |
#streakytext { | |
position: absolute; | |
width: 100%; | |
height: 100%; | |
} | |
canvas { | |
position: absolute; | |
top: 0; | |
left: 0; | |
} | |
#streakytext span { | |
position: absolute; | |
} | |
</style> | |
<title>StreakyText</title> | |
<script src='d3.min.js'></script> | |
<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js'></script> | |
<script src='improvedNoise.js'></script> | |
<script src='main.js?v=1'></script> | |
</head> | |
<body> | |
<div id='streakytext'></div> | |
<script> | |
// titles = d3.selectAll(".book-title")[0].map(function(d) { return d.innerText; }); | |
var titles = ["Rise of the Robots", "The Buried Giant", "Swimming With Sharks: My Journey Into the World of the Bankers", "Other People’s Money: The Real Business of Finance", "In This Together", "What Do You Do With an Idea?", "History's People: Personalities and the Past", "The Silk Roads", "How Music Works", "Superforecasting: The Art and Science of Prediction", "Ghost Fleet", "The New Tsar: The Rise and Reign of Vladimir Putin", "The Silk Road: A New History", "A World Lit Only by Fire", "The Courage to Act", "The Witches: Salem, 1692", "A Beautiful Question: Finding Nature’s Deep Design", "The Courage to Act", "Economics Rules", "Between Debt and the Devil", "Dreamland: The True Tale of America’s Opiate Epidemic", "Call Me Debbie: True Confessions of a Down-to-Earth Diva", "Scarcity", "Why Did Europe Conquer the World?", "Barbarian Days: A Surfing Life", "Unfinished Business", "Rise of the Robots: Technology and the Threat of a Jobless Future", "The Conservative Heart", "The Shape of the New: Four Big Ideas and How They Made the Modern World", "The Tsar of Love and Techno: Stories", "Between the World and Me", "Shadow Cold War: The Sino-Soviet Competition for the Third World", "The Buried Giant", "The Cost of Courage", "The Limits of Partnership: U.S.-Russian Relations in the Twenty-First Century", "Dealing with China: An Insider Unmasks the New Economic Superpower", "The Wright Brothers", "Kerouac: A Biography", "Give and Take", "Hiroshima Nagasaki: The Real Story of the Atomic Bombings and Their Aftermath", "No Ordinary Disruption", "This Changes Everything", "An Officer and a Spy", "Ataturk", "HHhH", "The Maisky Diaries", "The Courage to Act", "A Little Life: A Novel", "Superforecasting: The Art and Science of Prediction", "The Power of Being Yourself", "Primates of Park Avenue", "How Google Works", "Being Mortal", "The Courage to Act", "Lords of Finance", "Immortal: The Approved Biography of George Best", "Lancet Infectious Diseases", "Superforecasting: The Art and Science of Prediction", "The Century Trilogy (Fall of Giants, Winter of the World, Edge of Eternity)", "American Icon", "Political Order and Political Decay: From the Industrial Revolution to the Globalization of Democracy", "Just Mercy", "The Road to Character", "Skyfaring: A Journey With a Pilot", "Napoleon: A Life", "Collapse and Revival: Understanding Global Recessions and Recoveries", "Just Mercy", "Universal Man: The Lives of John Maynard Keynes", "Dead Wake", "The Girl on the Train", "Do No Harm", "The Wandering Falcon", "Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future", "Sapiens: A Brief History of Humankind", "Submission", "The Courage to Act", "End of Discussion", "Memories of a Marriage", "The Courage to Act"]; | |
titles = _.shuffle(titles); | |
var streakyText = new StreakyText(document.getElementById('streakytext'), titles); | |
</script> | |
</body> | |
</html> |
// TOTAL RIPOFF OF FIZZYTEXT | |
// https://github.com/dataarts/dat.gui/blob/gh-pages/docs/demo.js | |
// (still has a ton of vestigial elements thereof) | |
function StreakyText(container, titles) { | |
var that = this; | |
// These are the variables that we manipulate with gui-dat. | |
// Notice they're all defined with "this". That makes them public. | |
// Otherwise, gui-dat can't see them. | |
this.growthSpeed = 0.05; // how fast do particles change size? | |
this.minR = 0; | |
this.maxR = 12; | |
this.minV = .4; | |
this.maxV = 3; // how big can they get? | |
this.noiseStrength = 10; // how turbulent is the flow? | |
this.speed = 0; // how fast do particles move? | |
this.initialSpeed = 0; | |
this.speedDelay = 500; | |
this.timeToMaxSpeed = 4000; | |
this.maxSpeed = .5; | |
//////////////////////////////////////////////////////////////// | |
var _this = this; | |
var width = container.offsetWidth; | |
// var height = container.offsetHeight; | |
var height = .5 * width; | |
d3.select(container) | |
.style("height", height + "px"); | |
var noiseScale = 300; | |
var frameTime = 30; | |
var fontSizeScale = d3.scale.linear() | |
.domain([1200, 320]) | |
.range([200, 60]); | |
var particleFontSizeScale = d3.scale.linear() | |
.domain([1200, 320]) | |
.range([20, 10]); | |
var leftOffsetScale = d3.scale.linear() | |
.domain([1200, 320]) | |
.range([50, 0]) | |
// var fontSize = 200; | |
var fontSize = Math.round(fontSizeScale(width)); | |
var particleFontSize = Math.round(particleFontSizeScale(width)); | |
var leftOffset = Math.round(leftOffsetScale(width)) | |
var noise1 = noiser(4,.8); | |
var noise2 = noiser(4,.5); | |
// This is the context we use to get a bitmap of text using | |
// the getImageData function. | |
var r = document.createElement('canvas'); | |
var s = r.getContext('2d'); | |
// This is the context we actually use to draw. | |
var c = document.createElement('canvas'); | |
var g = c.getContext('2d'); | |
// This is the context we actually use to draw streaks. | |
var c2 = document.createElement('canvas'); | |
var g2 = c2.getContext('2d'); | |
r.setAttribute('width', width); | |
c.setAttribute('width', width); | |
c2.setAttribute('width', width); | |
r.setAttribute('height', height); | |
c.setAttribute('height', height); | |
c2.setAttribute('height', height); | |
// Add our demo to the HTML | |
// container.appendChild(r); | |
container.appendChild(c2); | |
container.appendChild(c); | |
// Stores bitmap image | |
var pixels = []; | |
// Stores a list of particles | |
var particles = []; | |
// Set g.font to the same font as the bitmap canvas, incase we | |
// want to draw some outlines. | |
s.font = "400 "+fontSize+"px helvetica, arial, serif"; | |
s.textBaseline = 'middle'; | |
g.font = g2.font = "400 "+particleFontSize+"px monospace"; | |
// g.globalAlpha = 1; | |
g.fillStyle = "#000"; | |
g2.fillStyle = "#ccc"; | |
g.globalCompositeOperation = "darken"; | |
g2.globalCompositeOperation = "multiply"; | |
var mouse = [width/2,height/2]; | |
d3.select(container).on("mousemove", function() { mouse = d3.mouse(this); }); | |
// Instantiate some particles | |
// for (var i = 0; i < 1500; i++) { | |
// particles.push(new Particle(Math.random() * width, Math.random() * height)); | |
// } | |
titles = titles.slice(0,50); | |
titles.forEach(function(d,i) { | |
var newH = i * (height / titles.length); | |
var newW = Math.random() * width * .3; | |
titles.pop().split("").forEach(function(character, i) { | |
particles.push(new Particle(newW + i*10, newH, character)); | |
}); | |
}) | |
// console.log(particles.length); | |
// This function creates a bitmap of pixels based on your message | |
// It's called every time we change the message property. | |
var createBitmap = function () { | |
s.fillStyle = "#fff"; | |
s.fillRect(0, 0, width, height); | |
s.fillStyle = "#000"; | |
s.fillText("Best Books", leftOffset, height*.33); | |
s.fillText("of 2015", leftOffset, height*.67); | |
// Pull reference | |
var imageData = s.getImageData(0, 0, width, height); | |
pixels = imageData.data; | |
}; | |
// Called once per frame, updates the animation. | |
var render = function (t) { | |
that.framesRendered ++; | |
g.clearRect(0, 0, width, height); | |
// speed is piecewise: flat at min, sin wave up to max, flat at max | |
// _this.speed = .5; | |
if(t < _this.speedDelay) { | |
_this.speed = 0; | |
} else if (t < _this.speedDelay + _this.timeToMaxSpeed) { | |
var tt = t - _this.speedDelay; | |
_this.speed = _this.maxSpeed * ( (Math.sin((Math.PI * tt / _this.timeToMaxSpeed) - (Math.PI/2)) + 1) / 2 ) | |
} else { | |
_this.speed = _this.maxSpeed; | |
} | |
// console.log(t, _this.speed); | |
for (var i = 0; i < particles.length; i++) { | |
particles[i].render(t); | |
} | |
}; | |
// Returns x, y coordinates for a given index in the pixel array. | |
var getPosition = function (i) { | |
return { | |
x: (i - (width * 4) * Math.floor(i / (width * 4))) / 4, | |
y: Math.floor(i / (width * 4)) | |
}; | |
}; | |
// Returns a color for a given pixel in the pixel array. | |
var getColor = function (x, y) { | |
var base = (Math.floor(y) * width + Math.floor(x)) * 4; | |
var c = { | |
r: pixels[base + 0], | |
g: pixels[base + 1], | |
b: pixels[base + 2], | |
a: pixels[base + 3] | |
}; | |
return "rgb(" + c.r + "," + c.g + "," + c.b + ")"; | |
}; | |
createBitmap(); | |
d3.timer(render); | |
// This class is responsible for drawing and moving those little | |
// colored dots. | |
function Particle(x, y, c) { | |
// Position | |
this.x = x; | |
this.y = y; | |
// Size of particle | |
this.r = _this.maxR / 1; | |
// Speed of particle | |
this.v = _this.maxV; | |
this.character = c || getRandomChar(); | |
this.constrain = function (v, o1, o2) { | |
if (v < o1) v = o1; | |
else if (v > o2) v = o2; | |
return v; | |
}; | |
function getRandomChar() | |
{ | |
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; | |
return possible.charAt(Math.floor(Math.random() * possible.length)); | |
} | |
// Called every frame | |
this.render = function (t) { | |
// What color is the pixel we're sitting on top of? | |
var c = getColor(this.x, this.y); | |
// Where should we move? | |
var angle1 = noise1(this.x / noiseScale, this.y / noiseScale) * _this.noiseStrength; | |
var angle2 = noise2(this.x / noiseScale, this.y / noiseScale) * _this.noiseStrength; | |
// Oscillate between two Perlin noise flow fields every 10 seconds | |
var noiseInterpolate = d3.scale.linear() | |
.range([angle2,angle1]); | |
var tt = .5 * Math.cos((2*Math.PI*t)/60000) + .5; | |
var angle = noiseInterpolate(tt); | |
// var angle = angle1; | |
// Are we within the boundaries of the image? | |
var onScreen = this.x > 0 && this.x < width && | |
this.y > 0 && this.y < height; | |
var isBlack = c != "rgb(255,255,255)" && onScreen; | |
// If we're on top of a black pixel, slow. | |
// If not, speed up. | |
if (isBlack) { | |
this.v -= _this.growthSpeed; | |
this.r += 10 * _this.growthSpeed * _this.speed; | |
// this.r = _this.maxR; | |
} else { | |
this.v += _this.growthSpeed; | |
this.r -= 3 * _this.growthSpeed * _this.speed; | |
} | |
this.r = this.constrain(this.r, _this.minR, _this.maxR); | |
this.v = this.constrain(this.v, _this.minV, _this.maxV); | |
// Change our position based on the flow field and our | |
// explode velocity. | |
this.x += Math.cos(angle) * this.v * _this.speed; | |
this.y += -Math.sin(angle) * this.v * _this.speed; | |
// this.x += 2; | |
// If we're off the screen, go over to other side (torus topology) | |
// if(this.x < 0) this.x = width; | |
// if(this.x > width) this.x = 0; | |
// if(this.y < 0) this.y = height; | |
// if(this.y > height) this.y = 0; | |
if (!onScreen) { | |
this.x = Math.random() * width; | |
this.y = Math.random() * height; | |
this.r = _this.minR; | |
return; // Don't draw! | |
} | |
// If we're tiny, keep moving around until we find a black | |
// pixel. | |
if (this.r <= _this.minR) { | |
this.x = Math.random() * width; | |
this.y = Math.random() * height; | |
this.r = _this.minR; | |
return; // Don't draw! | |
} | |
// Draw the streak. | |
// g.font = g2.font = "400 "+this.r+"px monospace"; | |
g.globalAlpha = this.r / _this.maxR; | |
g.fillText(this.character, this.x, this.y); | |
if(isBlack) { | |
g2.fillText(this.character, this.x, this.y); | |
} | |
} | |
} | |
} |