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October 1, 2016 19:25
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Fibonacci Spiral (for d3.unconf badge)
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| license: mit | |
| height: 1500 | |
| border: no | |
| scrolling: yes |
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> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width = window.innerWidth || 960, | |
| height = window.innerHeight || 500, | |
| transitionMs = 3100, | |
| cx = width * 0.726, | |
| cy = height * 0.405, | |
| dAttr = "m" + cx + "," + cy, | |
| dAttrSquare = dAttr, | |
| iterations = 13, | |
| scale = width * 0.01815, | |
| svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| // generated with http://tristen.ca/hcl-picker/#/hlc/6/1/15534C/E2E062 | |
| var palette = "#375D65,#396F6F,#408175,#4E9377,#64A476,#80B473,#A2C36F,#C7D06D,#F0DB70,white,white".split(",").reverse(); | |
| // calculate fib sequence and update path attr, build background <rect> | |
| // from an old old blog post: http://www.bytemuse.com/post/fibonacci-spiral/ | |
| var x = 0, y = 1, z = 1, | |
| radius, dx, dy, temp; | |
| for(var iter = 2; iter < iterations; iter++) { | |
| radius = x * scale; | |
| dx = iter % 4 < 2 ? radius : -radius; | |
| dy = (iter + 1) % 4 < 2 ? radius : -radius; | |
| dAttr += "a"+radius+","+radius+" 0 0 0 " + dx + "," + dy; | |
| x = y; | |
| y = z; | |
| z = x + y; | |
| dAttrSquare += " l"+dx+","+dy; | |
| svg.append('rect') | |
| .attr('x', dx < 0 ? (cx + dx) : cx) | |
| .attr('y', dy < 0 ? (cy + dy) : cy) | |
| .attr('width', Math.abs(dx)) | |
| .attr('height', Math.abs(dy)) | |
| .style('stroke', '#ccc') | |
| .style('stroke-width', '4px') | |
| .style('fill', palette[(iter-2) % palette.length]) | |
| .style('opacity', 0.5) | |
| .transition() | |
| .delay((iter - 2) * (transitionMs / 14)) | |
| .duration(300) | |
| .ease('cubic-in') | |
| .style('opacity', 1); | |
| cx += dx; | |
| cy += dy; | |
| } | |
| var pathSquare = svg.append('path') | |
| .attr('d', dAttrSquare) | |
| .style('fill', 'none') | |
| .style('stroke', 'white') | |
| .style('stroke-width', '3.5px') | |
| .style('stroke-dasharray', '12 12'); | |
| var path = svg.append('path') | |
| .attr('d', dAttr) | |
| .style('fill', 'none') | |
| .style('stroke', 'white') | |
| .style('stroke-width', '4.5px'); | |
| var length = path.node().getTotalLength(); | |
| path.attr('stroke-dasharray', length + ' ' + length) | |
| .attr('stroke-dashoffset', length) | |
| .transition() | |
| .duration(transitionMs) | |
| .ease('cubic-in') | |
| .attr('stroke-dashoffset', 0); | |
| </script> | |
| </body> |
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