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Created
September 10, 2016 18:32
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Site movement during Voronoi relaxation
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; | |
| } | |
| svg { background: white; } | |
| .poly {opacity:.3;fill:none} | |
| .spread {opacity: .1 } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| (function() { | |
| var options = { | |
| width: 960, | |
| height: 500, | |
| points: 25, | |
| iterations: 50, | |
| colorScale: d3.interpolateRgb('#0d0', '#22f'), | |
| modes: ['spread', 'point'], // Valid: "spread", "line", "point" | |
| pointSize: 3, | |
| filterPolygons: function(step) { | |
| var last = options.iterations - 1; | |
| return step == 0 || step == last; | |
| } | |
| }; | |
| var points = []; | |
| var width = options.width, height = options.height; | |
| var count = options.points; | |
| while(count-- > 0) { | |
| points.push([ | |
| Math.random() * width, | |
| Math.random() * height | |
| ]); | |
| }; | |
| var layers = [points]; | |
| var voronoi = d3.voronoi().size([width, height]); | |
| var iterations = options.iterations; | |
| while(iterations-- > 0) { | |
| points = voronoi.polygons(points).map(function(poly) { | |
| return d3.polygonCentroid(poly); | |
| }); | |
| layers.push(points); | |
| } | |
| var scale = d3.scaleSequential(options.colorScale).domain([0, options.iterations]); | |
| var $svg = d3.select('body').append('svg') | |
| .attr('width', options.width) | |
| .attr('height',options.height); | |
| $svg.selectAll('.layer') | |
| .data(layers) | |
| .enter() | |
| .append('g') | |
| .attr('class', 'layer') | |
| .each(function(layer, step) { | |
| var color = scale(step); | |
| if(options.filterPolygons(step)) { | |
| d3.select(this) | |
| .append('g') | |
| .attr('class', 'polys') | |
| .selectAll('.poly') | |
| .data(function() { return voronoi.polygons(layer);}) | |
| .enter() | |
| .append('path') | |
| .attr('class', 'poly') | |
| .attr('stroke', color) | |
| .attr('fill', color) | |
| .attr('d', function(poly) { | |
| return 'M' + poly.map(function(point) { | |
| return point.join(','); | |
| }).join('L') + 'Z'; | |
| }); | |
| } | |
| var enter = d3.select(this).selectAll() | |
| .data(function(points) {return points;}) | |
| .enter(); | |
| options.modes.map(function(mode) { | |
| switch(mode) { | |
| case 'spread': | |
| return enter | |
| .append('path') | |
| .attr('class', 'spread') | |
| .attr('d', function(p, i) { | |
| return 'M' + layers[0][i].join(',') + 'L' + p.join(','); | |
| }) | |
| .attr('stroke', color); | |
| case 'line': | |
| return enter | |
| .append('path') | |
| .attr('class', 'line') | |
| .attr('d', function(p, i) { | |
| var prev = step ? layers[step - 1][i] : p; | |
| return 'M' + prev.join(',') + 'L' + p.join(','); | |
| }) | |
| .attr('stroke', color); | |
| case 'point': | |
| return enter | |
| .append('circle') | |
| .attr('class', 'point') | |
| .attr('r', options.pointSize * .5) | |
| .attr('fill', color) | |
| .attr('cx', function(p) {return p[0]}) | |
| .attr('cy', function(p) {return p[1]}); | |
| } | |
| }); | |
| }); | |
| }()); | |
| </script> | |
| </body> |
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