A Pen by Noel Delgado on CodePen.
Created
January 23, 2015 19:41
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/* | |
* Noel Delgado - @pixelia_me | |
*/ | |
(function() { | |
var ctx, w, h, cx, cy, PI, PI_HALF, cos, sin, random, lineWidth, C, | |
rings, ringsLength, data; | |
ctx = document.createElement('canvas').getContext('2d'); | |
w = 600; | |
h = 600; | |
cx = (w / 2); | |
cy = (h / 2); | |
rings = []; | |
ringsLength = 0; | |
PI = Math.PI; | |
PI_HALF = PI / 2; | |
cos = Math.cos; | |
sin = Math.sin; | |
random = Math.random; | |
lineWidth = 0.2; | |
C = ["#ABF8FF", "#E76B76", "#1D2439", "#4F3762", "#67F9FF", "#0C0F18"]; | |
data = [ | |
/* ring {t:total_particles, r:radius, d:distance, s:speed, c:color} */ | |
[ | |
{t:80, r:(cx-10), d:40, s:30, c:C[1]}, | |
{t:60, r:(cx-20), d:40, s:80, c:C[2]}, | |
{t:20, r:(cx-30), d:20, s:80, c:C[2]}, | |
], | |
[ | |
{t:80, r:(cx-80), d:40, s:40, c:C[4]}, | |
{t:80, r:(cx-90), d:20, s:40, c:C[4]}, | |
{t:20, r:(cx-100), d:20, s:40, c:C[2]}, | |
{t:40, r:(cx-110), d:20, s:40, c:C[2]}, | |
], | |
[ | |
{t:60, r:(cx-160), d:40, s:20, c:C[2]}, | |
{t:20, r:(cx-170), d:30, s:60, c:C[2]}, | |
{t:40, r:(cx-180), d:40, s:60, c:C[2]}, | |
], | |
[ | |
{t:40, r:(cx-230), d:40, s:20, c:C[5]}, | |
{t:20, r:(cx-240), d:20, s:10, c:C[5]}, | |
], | |
[ | |
{t:10, r:(cx-290), d:10, s:10, c:C[4]} | |
] | |
]; | |
/* */ | |
ctx.canvas.width = w; | |
ctx.canvas.height = h; | |
document.body.appendChild(ctx.canvas); | |
data.forEach(function(group) { | |
var ring = []; | |
group.forEach(function(orbit, i) { | |
var total_particles, index; | |
total_particles = orbit.t; | |
index = 0; | |
for (; index < total_particles; index++) { | |
var radius, distance, speed, color, opacity; | |
radius = orbit.r; | |
distance = orbit.d; | |
speed = random() / orbit.s; | |
speed = i % 2 ? speed : speed * -1; | |
color = orbit.c; | |
opacity = orbit.o; | |
ring.push(new P(radius, distance, speed, color, opacity)); | |
radius = distance = speed = color = opacity = null; | |
} | |
}); | |
rings.push(ring); | |
}); | |
ringsLength = rings.length; | |
/* */ | |
function P(radius, distance, speed, color) { | |
this.a = PI / 180; | |
this.d = distance; | |
this.d2 = (this.d * this.d); | |
this.x = cx + radius * cos(this.a); | |
this.y = cy + radius * sin(this.a); | |
this.c = color; | |
this.r = (random() * 8); | |
this.R = random() > 0.5 ? radius : radius - 5; | |
this.s = speed; | |
this.pos = random() * 360; | |
} | |
function draw() { | |
var i, j, k, xd, yd, d, ring, ringLength, ringLength2, particle, p2; | |
ctx.beginPath(); | |
ctx.globalCompositeOperation = "source-over"; | |
ctx.rect(0, 0 , w, h); | |
ctx.fillStyle = "#151a28"; | |
ctx.fill(); | |
ctx.closePath(); | |
for (i = 0; i < ringsLength; i++) { | |
ring = rings[i]; | |
ringLength = ring.length; | |
ringLength2 = ringLength - 100; | |
for (j = 0; j < ringLength; j++) { | |
particle = ring[j]; | |
particle.x = cx + particle.R * sin(PI_HALF + particle.pos); | |
particle.y = cy + particle.R * cos(PI_HALF + particle.pos); | |
particle.pos += particle.s; | |
ctx.beginPath(); | |
ctx.globalAlpha = 0.12; | |
ctx.globalCompositeOperation = "lighter"; | |
ctx.fillStyle = particle.c; | |
ctx.arc(particle.x, particle.y, particle.r, PI * 2, false); | |
ctx.fill(); | |
ctx.closePath(); | |
for (k = 0; k < ringLength2; k++) { | |
p2 = ring[k]; | |
yd = p2.y - particle.y; | |
xd = p2.x - particle.x; | |
d = ((xd * xd) + (yd * yd)); | |
if (d < particle.d2) { | |
ctx.beginPath(); | |
ctx.globalAlpha = 1; | |
ctx.lineWidth = lineWidth; | |
ctx.moveTo(particle.x, particle.y); | |
ctx.lineTo(p2.x, p2.y); | |
ctx.strokeStyle = p2.c; | |
ctx.stroke(); | |
ctx.closePath(); | |
} | |
} | |
} | |
} | |
} | |
function loop() { | |
draw(); | |
requestAnimationFrame(loop); | |
} | |
loop(); | |
})(); |
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html, body { | |
margin: 0; | |
overflow: hidden; | |
background: #151a28; | |
} | |
canvas { | |
display: block; | |
position: absolute; | |
top: 50%; | |
left: 50%; | |
transform: translateX(-50%) translateY(-50%); | |
} |
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