Spirograph inspired by this stackoverflow question.
Created
March 12, 2017 18:31
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d3 Spirograph
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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.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script data-require="d3@4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 600, | |
| height = 600; | |
| var svg = d3.select('body') | |
| .append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| .append('g') | |
| .attr('transform','translate(' + width/2 + ',' + height/2 + ')'); | |
| var data = [ | |
| { | |
| r: 250, | |
| x: 0, | |
| y: 0, | |
| c: 'black', | |
| d: 0 | |
| }, { | |
| r: 175, | |
| x: 0, | |
| y: 0, | |
| c: 'steelblue', | |
| d: 10000 | |
| },{ | |
| r: 50, | |
| x: 0, | |
| y: 0, | |
| c: 'orange', | |
| d: 8000 | |
| },{ | |
| r: 40, | |
| x: 0, | |
| y: 0, | |
| c: 'red', | |
| d: 6000 | |
| },{ | |
| r: 30, | |
| x: 0, | |
| y: 0, | |
| c: 'green', | |
| d: 4000, | |
| l: 'color' | |
| },{ | |
| r: 2, | |
| x: 0, | |
| y: 0, | |
| c: 'yellow', | |
| d: 200, | |
| l: 'line' | |
| } | |
| ]; | |
| data.forEach(function(d,i){ | |
| if (i === 0) d.pD = null; | |
| else d.pD = data[i-1]; | |
| }); | |
| var line = updateLine(); | |
| svg.selectAll('circle') | |
| .data(data) | |
| .enter() | |
| .append('circle') | |
| .attr('r', function(d){ | |
| return d.r; | |
| }) | |
| .style('fill', 'none') | |
| .style('stroke', function(d){ | |
| return d.c | |
| }) | |
| .each(goRound); | |
| function goRound(d,i){ | |
| if (!d.pD) return function(t) { } | |
| if (d.l === 'color') line.newColor(); | |
| var self = d3.select(this); | |
| self.transition() | |
| .ease(d3.easeLinear) | |
| .duration(function(d){ | |
| return d.d; | |
| }) | |
| .tween("go.round", function(){ | |
| var inter = d3.interpolate(0, Math.PI * 2); | |
| return function(t) { | |
| d.x = Math.cos(inter(t)) * (d.pD.r - d.r) + d.pD.x; | |
| d.y = Math.sin(inter(t)) * (d.pD.r - d.r) + d.pD.y; | |
| self.attr('cx', d.x); | |
| self.attr('cy', d.y); | |
| if (d.l === 'line') { | |
| line.update([d.x, d.y]) | |
| } | |
| }; | |
| }) | |
| .on('end', goRound); | |
| } | |
| function updateLine(){ | |
| var line = d3.line(), | |
| data = [], | |
| c_index = -1 | |
| path = null; | |
| return { | |
| update: function(p){ | |
| data.push(p); | |
| path.attr('d', line(data)); | |
| }, | |
| newColor: function(){ | |
| c_index++; | |
| path = svg.append('path') | |
| .style('stroke', d3.schemeCategory10[c_index % 10]) | |
| .style('storke-width', '2px') | |
| .style('fill', 'none'); | |
| data = []; | |
| } | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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