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| license: mit |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3-timer.v1.min.js"></script> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas width="960" height="800"></canvas> | |
| <script> | |
| var length = 100; | |
| var color = d3.scaleLinear().domain([1,length]) | |
| .interpolate(d3.interpolateHcl) | |
| .range([d3.rgb("#00f946"), d3.rgb('#9500d1')]); | |
| var canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"), | |
| width = canvas.width, | |
| height = canvas.height, | |
| minRadius = 2.5, | |
| maxRadius = 5, | |
| minDistance = 80, | |
| maxDistance = 100, | |
| minDistance2 = minDistance * minDistance, | |
| maxDistance2 = maxDistance * maxDistance; | |
| var tau = 2 * Math.PI, | |
| n = 100, | |
| particles = new Array(n); | |
| for (var i = 0; i < n; ++i) { | |
| particles[i] = { | |
| x: width * Math.random(), | |
| y0: height * Math.random(), | |
| v: 0.1 * (Math.random() - 0.5), | |
| r: minRadius + Math.random() * (maxRadius), | |
| c: color(Math.floor(Math.random()*100)) | |
| }; | |
| } | |
| d3.timer(function(elapsed) { | |
| context.clearRect(0, 0, width, height); | |
| for (var i = 0; i < n; ++i) { | |
| for (var j = i + 1; j < n; ++j) { | |
| var pi = particles[i], | |
| pj = particles[j], | |
| dx = pi.x - pj.x, | |
| dy = pi.y - pj.y, | |
| d2 = dx * dx + dy * dy; | |
| if (d2 < maxDistance2) { | |
| context.globalAlpha = d2 > minDistance2 ? (maxDistance2 - d2) / (maxDistance2 - minDistance2) : 1; | |
| context.beginPath(); | |
| context.moveTo(pi.x, pi.y); | |
| context.lineTo(pj.x, pj.y); | |
| context.stroke(); | |
| } | |
| } | |
| } | |
| context.globalAlpha = 1; | |
| for (var i = 0; i < n; ++i) { | |
| var p = particles[i]; | |
| p.y = p.y0 + elapsed * p.v; | |
| if (p.y > height + maxDistance) p.x = width * Math.random(), p.y0 -= height + 2 * maxDistance; | |
| else if (p.y < -maxDistance) p.x = width * Math.random(), p.y0 += height + 2 * maxDistance; | |
| context.beginPath(); | |
| context.arc(p.x, p.y, p.r, 0, tau); | |
| context.fillStyle = p.c; | |
| context.fill(); | |
| } | |
| }); | |
| </script> | |
| </body> |
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