Last active
December 31, 2016 18:59
-
-
Save paulgb/2076816d87243c189f885afe215e950b to your computer and use it in GitHub Desktop.
Hot Air Rises
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.
Learn more about bidirectional Unicode characters
| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| </head> | |
| <body> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> |
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.
Learn more about bidirectional Unicode characters
| maxSize = 5 | |
| coreSize = 10 | |
| points = 600 | |
| data = new Array(points).fill().map((_, i) => | |
| {return { | |
| radius: i % 50 == 0 ? maxSize : maxSize / 2, | |
| x: 200 * Math.cos(2 * Math.PI * i / points), | |
| y: 200 * Math.sin(2 * Math.PI * i / points) | |
| }}) | |
| data.unshift({radius: coreSize, fx: 0, fy: 0}) | |
| colors = d3.scaleLinear().domain([0,maxSize,coreSize]) | |
| .range(['#00f', '#f00', '#CCC']) | |
| function jitter(amount) { | |
| nodes = [] | |
| force = function (alpha) { | |
| for (node of nodes) { | |
| node.vx += (Math.random() -0.5) * alpha * amount; | |
| node.vy += (Math.random() - 0.5) * alpha * amount; | |
| } | |
| } | |
| force.initialize = function(_nodes) { | |
| nodes = _nodes; | |
| } | |
| return force; | |
| } | |
| height = 505 | |
| width = 960 | |
| circles = d3.select('body').append('svg') | |
| .attr('height', height) | |
| .attr('width', width) | |
| .style('background-color', '#eee') | |
| .append('g') | |
| .attr('transform', | |
| `translate(${width/2} ${height/2})`) | |
| .selectAll('*') | |
| .data(data) | |
| .enter() | |
| .append('circle') | |
| .attr('fill', (d) => colors(d.radius)) | |
| .attr('r', 3) | |
| d3.forceSimulation(data) | |
| .force('gravity', d3.forceY(0).strength(0.08)) | |
| .force('gravity2', d3.forceX(0).strength(0.08)) | |
| .force('jitter', jitter(0.1)) | |
| .force('collision', d3.forceCollide((d) => Math.pow(d.radius, 1.3) / 1)) | |
| .alpha(0.125) | |
| .alphaDecay(0) | |
| .on('tick', () => { | |
| circles | |
| .attr('cx', (d) => d.x * 1.5) | |
| .attr('cy', (d) => d.y * 1.5) | |
| }) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment