Marching contours!
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September 14, 2017 21:52
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When the Contours Go Marching In
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| license: gpl-3.0 | |
| border: no |
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> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no" /> | |
| </head> | |
| <body> | |
| <svg width="960" height="500" stroke-linejoin="round" stroke-linecap="round"> | |
| </svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-contour.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> | |
| <script> | |
| var svg = d3.select('svg'), | |
| svgWidth = +svg.attr('width'), | |
| randomNumberGenerator = d3.randomNormal(), | |
| n = 96, // data width | |
| m = 50, // data height | |
| values = []; | |
| // fill in the data array with random numbers within a normal distribution | |
| values.length = n * m; | |
| for (var i = 0; i < values.length; ++i) { | |
| // positive values only, | |
| // just for the sake of making contour thresholds easier to experiment with | |
| values[i] = Math.abs(randomNumberGenerator()); | |
| } | |
| svg.selectAll('path') | |
| .data(d3.contours() | |
| .size([n, m]) | |
| .thresholds(d3.range(0.5, 3.5, 0.5))(values) // this will create 6 steps | |
| ) | |
| .enter().append('path') | |
| .attr('d', d3.geoPath(d3.geoIdentity().scale(svgWidth / n))) | |
| .style('fill', 'none') | |
| .style('stroke', function(d, idx) { | |
| return d3.schemeOranges[9][idx] | |
| }) | |
| .style('stroke-width', 2.5) | |
| .style('stroke-dasharray', '0, 1000'); | |
| // march the contours into existence | |
| svg.selectAll('path') | |
| .transition() | |
| .duration(7000) | |
| .style('stroke-dasharray', '1000, 0'); | |
| </script> | |
| </body> | |
| </html> |
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