##D3 Star Trails
An attempt to recreate this picture of star trails in D3.
Last active
October 9, 2016 02:07
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D3 Star Trails
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style></style> | |
| <!-- https://imgur.com/a/5baGi --> | |
| <body></body> | |
| <script type="text/javascript"> | |
| var width = 960; | |
| var height = 500; | |
| var data = []; | |
| var arcs = 4500; | |
| var innerradius, outerradius, startangle, endangle, opacity, arccolor; | |
| var color = d3.interpolateRgb("#FFFFFF", "#68DAF9"); | |
| //Generate random arc properties within constraints | |
| for( i=0; i < arcs; i++ ) | |
| { | |
| arccolor = d3.randomUniform(0, 1.0)(); | |
| innerradius = d3.randomUniform( 10, width )(); | |
| if(arccolor < 0.2) | |
| { | |
| outerradius = innerradius + d3.randomUniform(0.8, 1.8)(); | |
| opacity = d3.randomNormal(0.6, 0.8)(); | |
| } | |
| if(arccolor > 0.2) | |
| { | |
| outerradius = innerradius + d3.randomUniform(0.5, 1.0)(); | |
| opacity = d3.randomNormal(0.3, 0.7)(); | |
| } | |
| var startangle = d3.randomUniform( 0, 2 * Math.PI )(); | |
| var endangle = startangle - (25 * Math.PI / 180); | |
| var opacity = d3.randomNormal(0.3, 0.8)(); | |
| var arccolor = color(d3.randomUniform(0, 1.0)()); | |
| //console.log(color(arccolor)); | |
| data.push( { innerradius: innerradius, outerradius: outerradius, start: startangle, end: endangle, opacity: opacity, color: arccolor } ); | |
| } | |
| //Polaris | |
| data.push( {innerradius: 0, outerradius: 1.3, start: 0, end: 2 * Math.PI, opacity: 0.85, color: color(0) }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g"); | |
| svg.append("rect") | |
| .attr("width", "100%") | |
| .attr("height", "100%") | |
| .attr("fill", "#021F3F"); | |
| var arc = d3.arc() | |
| .startAngle( function(d) { return d.start; }) | |
| .endAngle( function(d) { return d.end; }) | |
| .innerRadius( function(d) { return d.innerradius; }) | |
| .outerRadius( function(d) { return d.outerradius; }); | |
| var chart = function(data) { | |
| svg.selectAll("path") | |
| .data(data) | |
| .enter() | |
| .append("path") | |
| .attr("class", "arc") | |
| .attr("d", arc) | |
| .attr("transform", "translate(" + width / 5 + "," + height / 1.7 + ")") | |
| .attr("fill", function(d) { return d.color; }) | |
| .style("opacity", function(d) { return d.opacity; }); | |
| } | |
| chart(data); | |
| </script> |
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