A modification of Mike Bostock's Connected Particles. An exercise to become familiar with the canvas. Varied the circle size to give some element of depth, and turned the lines into curves.
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Connected Particles
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <html> | |
| <head> | |
| <title></title> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <canvas width="1400" height="800"></canvas> | |
| <script type="text/javascript"> | |
| var canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"), | |
| width = canvas.width, | |
| height = canvas.height, | |
| radius = 2.5, | |
| minDistance = 20, | |
| maxDistance = 100, | |
| minDistance2 = minDistance * minDistance, | |
| maxDistance2 = maxDistance * maxDistance; | |
| var tau = 2 * Math.PI, | |
| n = 1000, | |
| particles = new Array(n); | |
| for (var i = 0; i < n; ++i){ | |
| particles[i] = { | |
| x: width * Math.random(), | |
| y0: height * Math.random(), | |
| v: .1 * (Math.random() - .5) | |
| }; | |
| } | |
| 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.quadraticCurveTo( | |
| (pj.x - pi.x) / 2 + Math.min(pj.x, pi.x), | |
| (Math.max(pi.y, pj.y) - Math.min(pi.y, pj.y)) / 2 + Math.min(pj.y, pi.y) + 5, | |
| pj.x, | |
| pj.y); | |
| context.stroke(); | |
| } | |
| } | |
| } | |
| context.globalAlpha = 0.8; | |
| 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(); | |
| var scaleFactor = (p.v * 10 + 0.6) * 2.5; | |
| var dotRadius = p.v > 0 ? radius * scaleFactor : radius / scaleFactor; | |
| context.arc(p.x, p.y, dotRadius, 0, tau); | |
| context.fill(); | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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