playing with spirals and the basics of trigonometry.
square roots make all the difference.
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December 19, 2017 01:36
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thing 0002
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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.
Learn more about bidirectional Unicode characters
| <!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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