HTML5 Canvas Text Particles Effect - remixed
It can haz moar art
original script by Rishabh http://cssdeck.com/labs/cool-canvas-particles-text-effect
additions by Rezoner: blur, pulsation, quality, blinking, arc/rect, trembling, background adjusting
<div id="gui">
<div id="gui">
<label>effect</label>
<select id="effect">
<option value=0>none</option>
<option value=1>blur</option>
<option value=2>blink</option>
<option value=3>earthquake</option>
</select><label>global pulsation</label>
<select id="globalPulsation">
<option value=0>no</option>
<option value=1>yes</option>
</select><label>pulsation speed</label>
<select id="pulsationSpeed">
<option value=100>0.1 s</option>
<option value=250>0.25 s</option>
<option value=500 selected>0.5 s</option>
<option value=1000>1 s</option>
<option value=1500>1.5 s</option>
</select><label>radius</label>
<select id="particleRadius">
<option value=2>2</option>
<option value=5 selected>5</option>
<option value=7>7</option>
<option value=10>10</option>
<option value=15>15</option>
</select><label>shapes</label>
<select id="shape">
<option value=0>circles</option>
<option value=1>rectangles</option>
</select> <label>blending</label>
<select id="blending">
<option value=1 selected>yes</option>
<option value=0>no</option>
</select><button id="text">text</button>
<button id="link">link</button>
</div><canvas id="canvas" width="600" height="300"></canvas>
<div class="copy">
© copystuff by <a href="http://rezoner.net">Rezoner</a> and <a href="http://cssdeck.com">Rishabh</a> - <a style="color:#835;" href="http://cssdeck.com/labs/db2o5oej/0">Compose your own effect</a>
</div>body { background: #003; text-align: center; font- family: "trebuchet ms" }
body { background: #003; text-align: center; font-family: "trebuchet ms" }
canvas { left: 50%; position: absolute; top: 50%; margin-top: -150px; margin-left: -300px; }
#gui { background: rgba(0, 60, 60, 0.5); padding: 4px; border-bottom: 1px solid rgba(0, 0, 0, 0.5); }
label { color: #0aa; font-size: 11px; max-width: 60px; display: inline-block; vertical-align:middle }
select { background: rgba(0, 0, 0, 0.5); color: #0ff; border-radius: 7px; border: 0; padding: 2px; font-size: 13px }
option { background: #012; }
.copy { position: absolute; bottom: 16px; right: 16px; color: #228 }
a { color: #259 }
/*
/* original script by Rishabhadditions by Rezoner: blur, pulsation, quality, blinking, arc/rect, trembling, background adjusting*/ /* play with these values */BLUR = false;
PULSATION = true;
PULSATION_PERIOD = 500;
PARTICLE_RADIUS = 5;
/* disable blur before using blink */BLINK = false;
GLOBAL_PULSATION = false;
QUALITY = 2; /* 0 - 5 */
/* set false if you prefer rectangles */ARC = true;
/* trembling + blur = fun */TREMBLING = 0; /* 0 - infinity */
FANCY_FONT = "arial";
BACKGROUND = "#003";
BLENDING = true;
/* if empty the text will be a random number */TEXT = "";
/* ------------------ */var ENCODE_DATA = ["BLUR", "BLENDING", "GLOBAL_PULSATION", "TEXT", "TREMBLING", "ARC", "PULSATION_PERIOD", "PARTICLE_RADIUS", "PULSATION", "BLINK"];
var GET = {};
var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m, key, value) {
GET[key] = value;
});
decodeData();QUALITY_TO_FONT_SIZE = [10, 20, 50, 100, 200, 350];
QUALITY_TO_SCALE = [20, 14, 6, 3, 1.5, 0.9];
QUALITY_TO_TEXT_POS = [10, 18, 43, 86, 170, 280];
window.onload = function() {
document.body.style.backgroundColor = BACKGROUND;
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var W = canvas.width;
var H = canvas.height;
var tcanvas = document.createElement("canvas");
var tctx = tcanvas.getContext("2d");
tcanvas.width = W;
tcanvas.height = H;
total_area = W * H;
total_particles = 800;
single_particle_area = total_area / total_particles;
area_length = Math.sqrt(single_particle_area);
console.log(area_length);
var particles = [];
for(var i = 1; i <= total_particles; i++) {
particles.push(new particle(i));
}
function particle(i) {
this.r = Math.round(Math.random() * 255 | 0);
this.g = Math.round(Math.random() * 255 | 0);
this.b = Math.round(Math.random() * 255 | 0);
this.alpha = 1;
this.x = (i * area_length) % W;
this.y = (i * area_length) / W * area_length;
/* randomize delta to make particles sparkling */this.deltaOffset = Math.random() * PULSATION_PERIOD | 0;
this.radius = 0.1 + Math.random() * 2;
}
var positions = [];
function new_positions() {
tctx.fillStyle = "white";
tctx.fillRect(0, 0, W, H)
tctx.fill();
tctx.font = "bold " + QUALITY_TO_FONT_SIZE[QUALITY] + "px " + FANCY_FONT;
var text = TEXT || String(Math.random()).substr(-3);
tctx.strokeStyle = "black";
tctx.strokeText(text, (QUALITY + 1) * 5, QUALITY_TO_TEXT_POS[QUALITY]);
image_data = tctx.getImageData(0, 0, W, H);
pixels = image_data.data;
positions = [];for(var i = 0; i < pixels.length; i = i + 4) {
if(pixels[i] != 255) {
position = {x: (i / 4 % W | 0) * QUALITY_TO_SCALE[QUALITY] | 0,
y: (i / 4 / W | 0) * QUALITY_TO_SCALE[QUALITY] | 0
}
positions.push(position);
}
}
get_destinations();}
function draw() {
var now = Date.now();
ctx.globalCompositeOperation = "source-over";
if(BLUR) ctx.globalAlpha = 0.1;
else if(!BLUR && !BLINK) ctx.globalAlpha = 1.0;
ctx.fillStyle = BACKGROUND;
ctx.fillRect(0, 0, W, H)
if(BLENDING) ctx.globalCompositeOperation = "lighter";
for(var i = 0; i < particles.length; i++) {
p = particles[i];
/* in lower qualities there is not enough full pixels for all of them - dirty hack*/if(isNaN(p.x)) continue
ctx.beginPath();
ctx.fillStyle = "rgb(" + p.r + ", " + p.g + ", " + p.b + ")";
ctx.fillStyle = "rgba(" + p.r + ", " + p.g + ", " + p.b + ", " + p.alpha + ")";
if(BLINK) ctx.globalAlpha = Math.sin(Math.PI * mod * 1.0);
if(PULSATION) { /* this would be 0 -> 1 */
var mod = ((GLOBAL_PULSATION ? 0 : p.deltaOffset) + now) % PULSATION_PERIOD / PULSATION_PERIOD;
/* lets make the value bouncing with sinus */mod = Math.sin(mod * Math.PI);
} else var mod = 1;
var offset = TREMBLING ? TREMBLING * (-1 + Math.random() * 2) : 0;
var radius = PARTICLE_RADIUS * p.radius;
if(!ARC) {
ctx.fillRect(offset + p.x - mod * radius / 2 | 0, offset + p.y - mod * radius / 2 | 0, radius * mod, radius * mod);
} else {ctx.arc(offset + p.x | 0, offset + p.y | 0, radius * mod, Math.PI * 2, false);
ctx.fill();
}
p.x += (p.dx - p.x) / 10;
p.y += (p.dy - p.y) / 10;
}
}
function get_destinations() {
for(var i = 0; i < particles.length; i++) {
pa = particles[i];
particles[i].alpha = 1;
var distance = [];
nearest_position = 0;
if(positions.length) {
for(var n = 0; n < positions.length; n++) {
po = positions[n];
distance[n] = Math.sqrt((pa.x - po.x) * (pa.x - po.x) + (pa.y - po.y) * (pa.y - po.y));
if(n > 0) {
if(distance[n] <= distance[nearest_position]) {
nearest_position = n;
}
}
}
particles[i].dx = positions[nearest_position].x;
particles[i].dy = positions[nearest_position].y;
particles[i].distance = distance[nearest_position];
var po1 = positions[nearest_position];
for(var n = 0; n < positions.length; n++) {
var po2 = positions[n];
distance = Math.sqrt((po1.x - po2.x) * (po1.x - po2.x) + (po1.y - po2.y) * (po1.y - po2.y));
if(distance <= 5) {
positions.splice(n, 1);
}
}
} else { //particles[i].alpha = 0;}
}
}
function init() {
new_positions();setInterval(draw, 16.67);
setInterval(new_positions, 2000);
}
init();}
/* GUI */ document.getElementById("globalPulsation").addEventListener("change", function() {
switch(this.value | 0) {
case 0: GLOBAL_PULSATION = false; break;
case 1: GLOBAL_PULSATION = true; break;
}
});document.getElementById("effect").addEventListener("change", function() {
TREMBLING = 0;
switch(this.value | 0) {
case 0: BLUR = false; BLINK = false; break;
case 1: BLUR = true; BLINK = false; break;
case 2: BLUR = false; BLINK = true; break;
case 3: BLUR = true; TREMBLING = 5; break;
}
}); document.getElementById("pulsationSpeed").addEventListener("change", function() {
PULSATION_PERIOD = this.value;
});document.getElementById("particleRadius").addEventListener("change", function() {
PARTICLE_RADIUS = this.value;
}); document.getElementById("shape").addEventListener("change", function() {
ARC = !parseInt(this.value);
}); document.getElementById("blending").addEventListener("change", function() {
BLENDING = parseInt(this.value);
});document.getElementById("link").addEventListener("click", function() {
var data = [ ];
for(var i = 0; i < ENCODE_DATA.length; i++) {
var key = ENCODE_DATA[i];
var val = window[key];
if(typeof val !== "string") val = val | 0;
else val = encodeURIComponent(val);
data.push(key, val);
} var link = "http://cssdeck.com/labs/full/db2o5oej/0/noframe/?options=" + data.join("__");
prompt("your link", link);
});
function decodeData() {
if(GET['options']) {
var temp = GET['options'].split("__");
for(var i = 0; i < ENCODE_DATA.length * 2; i += 2) {
var val = temp[i + 1];
if(typeof window[temp[i]] !== "string") val = parseInt(val);
else val = decodeURIComponent(val);
window[temp[i]] = val;
}
document.getElementById("gui").style.display = "none";
}
}
document.getElementById("text").addEventListener("click", function() {
TEXT = prompt("Enter new text", TEXT);
});