playing with spirals and the basics of trigonometry.
square roots make all the difference.
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Last active
December 19, 2017 01:36
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| license: mit |
This file contains 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.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; | |
| background: #111; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 960; | |
| var height = 500; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| var num = 200; | |
| var maxlen = 50; | |
| var cellSize = 15; | |
| var angleVelocity = 206.432 | |
| var radiusVelocity = 7.4597881856 | |
| //https://coolors.co/359aa8-fad8d6-6b62c4-cc5151-e5c03b | |
| var colors = [ | |
| "#359AA8", | |
| "#FAD8D6", | |
| "#6B62C4", | |
| "#CC5151", | |
| "#E5C03B", | |
| ] | |
| var i = 0; | |
| var sequences = d3.range(num).map(function(j) { | |
| var len = maxlen | |
| var len = 5 + Math.ceil(Math.random() * maxlen) | |
| var color = colors[Math.floor(Math.random()*colors.length)] | |
| //var color = colors[j % colors.length] | |
| return d3.range(len).map(function(k) { | |
| i++; | |
| return { | |
| i: i, j: j, k: k, | |
| color: color//"#60ffe4" | |
| } | |
| }) | |
| }) | |
| var rects = [] | |
| sequences.forEach(function(sequence) { | |
| sequence.forEach(function(cell) { | |
| var ai = Math.sqrt(64+cell.i) | |
| var theta = ai * angleVelocity * Math.PI/180 | |
| var radius = ai * radiusVelocity | |
| cell.x = width/2 + radius * Math.cos(theta) | |
| cell.y = height/2 + radius * Math.sin(theta) | |
| cell.theta = theta | |
| rects.push(cell) | |
| }) | |
| }) | |
| console.log("sequences", sequences) | |
| var gs = svg.selectAll("g.cell").data(rects) | |
| gs.exit().remove() | |
| var gsE = gs.enter() | |
| .append("g").classed("cell", true) | |
| gsE.append("rect") | |
| gs = gsE.merge(gs) | |
| gs.select("rect") | |
| .attr("x", function(d) { | |
| return d.x | |
| }) | |
| .attr("y", function(d) { | |
| return d.y | |
| }) | |
| .attr("width", function(d) { | |
| return cellSize | |
| }) | |
| .attr("height", function(d) { | |
| return cellSize | |
| }) | |
| .style("fill", function(d) { return d.color }) | |
| // .style("stroke", "#111") | |
| // .style("stroke-width", 1.5) | |
| .style("fill-opacity", 0.8) | |
| .attr("transform", function(d) { | |
| return "rotate(" + (d.theta/Math.PI*180) + "," + [d.x + cellSize/2, d.y + cellSize/2] + ")" | |
| }) | |
| </script> | |
| </body> |
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