Published
Edited
Apr 30, 2019
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render = {
const particleContext = DOM.context2d(w, h);
const randomWalkParticles = Array.from({length: activeParticles},
() => [Math.random() * w,
Math.random() * h,
(Math.random() - 0.5),
(Math.random() - 0.5)]);
const minDistance2 = minDistance * minDistance;
const maxDistance2 = maxDistance * maxDistance;
for(let iterations = 0; iterations < maxIterations; iterations++){
particleContext.strokeStyle= colorScale(iterations);
//Connections
for (let i = 0; i < activeParticles; ++i) {
for (let j = i + 1; j < activeParticles; ++j) {
const pi = randomWalkParticles[i];
const pj = randomWalkParticles[j];
const dx = pi[0] - pj[0];
const dy = pi[1] - pj[1];
const d2 = dx * dx + dy * dy;
if (d2 < maxDistance2) {
particleContext.globalAlpha = d2 > minDistance2 ? (maxDistance2 - d2) / (maxDistance2 - minDistance2) : 1;
particleContext.beginPath();
particleContext.moveTo(pi[0], pi[1]);
particleContext.lineTo(pj[0], pj[1]);
particleContext.stroke();
}
}
}
let c = particleContext.canvas;
c.style.width= "100%";
c.style.height= "100%";
c.style.position= "absolute";
c.style.zIndex= -1;
c.style.top= 0;
c.style.left= 0;
yield c;
for (const p of randomWalkParticles) {
//Random Walk
p[0] += p[2];
p[1] += p[3];
if (p[0] < (0 - maxDistance)) p[0] = w + maxDistance;
else if (p[0] > (width + maxDistance)) p[0] = 0 - maxDistance;
if (p[1] < (0 - maxDistance)) p[1] = h + maxDistance;
else if (p[1] > (h + maxDistance)) p[1] = 0 - maxDistance;
p[2] += 0.3 * (Math.random() - 0.5) - .01 * p[2];
p[3] += 0.3 * (Math.random() - 0.5) - .01 * p[3];
}
}
}
colorScale = d3.scaleLinear()
.domain([0,
maxIterations*0.182,
maxIterations*0.191,
maxIterations*0.2,
maxIterations*.75,
maxIterations*.9,
maxIterations])//, maxIterations])
.range(["#134870",
"hsl(211, 42%, 52%)",
"hsl(357, 79%, 32%)",
"hsl(211, 42%, 52%)",
"#134870",
"hsl(53, 90%, 52%)",
"hsl(39, 90%, 52%)"]);//, "hsl(53, 90%, 52%)"]);
activeParticles = 9
h = 500//Math.max(document.documentElement.clientHeight, window.innerHeight || 1);
w = 500//Math.max(document.documentElement.clientHeight, window.innerHeight || width);
pxCnt = w*h
minDistance = maxDistance / 10;
maxDistance = sidePerParticle
maxIterations = 1500;
d3 = require("d3-scale@2")
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