A Voronoi diagram colored with a radial gradient centered on each cell's site. The luminance of each point is proportional to the cost of reaching the nearest site (the darker the color, the higher the cost).
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September 28, 2016 15:38
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Cushion Voronoi
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| svg = d3.select 'svg' | |
| width = svg.node().getBoundingClientRect().width | |
| height = svg.node().getBoundingClientRect().height | |
| defs = svg.append 'defs' | |
| radius = 10 | |
| sites_data = d3.range(20).map () -> | |
| return { | |
| x: Math.round(Math.random() * (width - radius * 2) + radius), | |
| y: Math.round(Math.random() * (height - radius * 2) + radius) | |
| } | |
| voronoi = d3.voronoi() | |
| .x (d) -> d.x | |
| .y (d) -> d.y | |
| .extent [[-1, -1], [width + 1, height + 1]] | |
| cells_data = voronoi.polygons(sites_data) | |
| # define cells gradients | |
| gradients = defs.selectAll '.gradient' | |
| .data sites_data | |
| enter_gradients = gradients.enter().append 'radialGradient' | |
| .attrs | |
| class: 'gradient' | |
| gradientUnits: 'userSpaceOnUse' | |
| id: (d,i) -> "gradient_#{i}" | |
| cx: (d) -> d.x | |
| cy: (d) -> d.y | |
| r: 300 | |
| enter_gradients.append 'stop' | |
| .attrs | |
| offset: '0%' | |
| 'stop-color': 'white' | |
| enter_gradients.append 'stop' | |
| .attrs | |
| offset: '100%' | |
| 'stop-color': 'black' | |
| # render cells | |
| cells = svg.selectAll '.cell' | |
| .data cells_data | |
| cells.enter().append 'path' | |
| .attrs | |
| class: 'cell' | |
| d: (d) -> if not d? then null else "M" + d.join("L") + "Z" | |
| fill: (d,i) -> "url(#gradient_#{i})" | |
| # render sites | |
| sites = svg.selectAll '.site' | |
| .data sites_data | |
| sites.enter().append 'circle' | |
| .attrs | |
| class: 'site' | |
| r: radius | |
| cx: (d) -> d.x | |
| cy: (d) -> d.y | |
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| body, html { | |
| padding: 0; | |
| margin: 0; | |
| height: 100%; | |
| } | |
| svg { | |
| width: 100%; | |
| height: 100%; | |
| background: white; | |
| } | |
| .site { | |
| fill: #DDD; | |
| stroke: gray; | |
| } | |
| .cell { | |
| shape-rendering: crispEdges; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Cushion Voronoi</title> | |
| <link type="text/css" href="index.css" rel="stylesheet"/> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-selection-multi.v0.4.min.js"></script> | |
| </head> | |
| <body> | |
| <svg></svg> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| // Generated by CoffeeScript 1.10.0 | |
| (function() { | |
| var cells, cells_data, defs, enter_gradients, gradients, height, radius, sites, sites_data, svg, voronoi, width; | |
| svg = d3.select('svg'); | |
| width = svg.node().getBoundingClientRect().width; | |
| height = svg.node().getBoundingClientRect().height; | |
| defs = svg.append('defs'); | |
| radius = 10; | |
| sites_data = d3.range(20).map(function() { | |
| return { | |
| x: Math.round(Math.random() * (width - radius * 2) + radius), | |
| y: Math.round(Math.random() * (height - radius * 2) + radius) | |
| }; | |
| }); | |
| voronoi = d3.voronoi().x(function(d) { | |
| return d.x; | |
| }).y(function(d) { | |
| return d.y; | |
| }).extent([[-1, -1], [width + 1, height + 1]]); | |
| cells_data = voronoi.polygons(sites_data); | |
| gradients = defs.selectAll('.gradient').data(sites_data); | |
| enter_gradients = gradients.enter().append('radialGradient').attrs({ | |
| "class": 'gradient', | |
| gradientUnits: 'userSpaceOnUse', | |
| id: function(d, i) { | |
| return "gradient_" + i; | |
| }, | |
| cx: function(d) { | |
| return d.x; | |
| }, | |
| cy: function(d) { | |
| return d.y; | |
| }, | |
| r: 300 | |
| }); | |
| enter_gradients.append('stop').attrs({ | |
| offset: '0%', | |
| 'stop-color': 'white' | |
| }); | |
| enter_gradients.append('stop').attrs({ | |
| offset: '100%', | |
| 'stop-color': 'black' | |
| }); | |
| cells = svg.selectAll('.cell').data(cells_data); | |
| cells.enter().append('path').attrs({ | |
| "class": 'cell', | |
| d: function(d) { | |
| if (d == null) { | |
| return null; | |
| } else { | |
| return "M" + d.join("L") + "Z"; | |
| } | |
| }, | |
| fill: function(d, i) { | |
| return "url(#gradient_" + i + ")"; | |
| } | |
| }); | |
| sites = svg.selectAll('.site').data(sites_data); | |
| sites.enter().append('circle').attrs({ | |
| "class": 'site', | |
| r: radius, | |
| cx: function(d) { | |
| return d.x; | |
| }, | |
| cy: function(d) { | |
| return d.y; | |
| } | |
| }); | |
| }).call(this); |
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