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.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script data-require="[email protected]" 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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