Blur-diffused heatmap.
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October 4, 2016 19:17
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Blurred Matrix Heatmap
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| height: 480 | |
| license: mit |
This file contains hidden or 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> | |
| <meta charset="utf-8"> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select('svg'), | |
| width = +svg.attr('width'), | |
| height = +svg.attr('height'); | |
| /******************************************************************************* | |
| * Color Palette | |
| */ | |
| var colorScale = d3.scaleQuantize() | |
| .range(['#ffffb2', '#fed976', '#feb24c', '#fd8d3c', '#f03b20', '#bd0026']); | |
| /****************************************************************************** | |
| * Gooey Filter | |
| * Source: https://bl.ocks.org/nbremer/3da658e9a21cd3c71d0819f9698f3bfa | |
| */ | |
| var defs = svg.append('defs'); | |
| var filter = defs.append('filter').attr('id','gooeyCodeFilter'); | |
| filter.append('feGaussianBlur') | |
| .attr('in','SourceGraphic') | |
| .attr('stdDeviation','20') | |
| //to fix safari: http://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image | |
| .attr('color-interpolation-filters','sRGB') | |
| .attr('result','blur'); | |
| filter.append('feColorMatrix') | |
| .attr('in','blur') | |
| .attr('mode','matrix') | |
| .attr('values','1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 19 -9') | |
| .attr('result','gooey'); | |
| /****************************************************************************** | |
| * Generate 20x10 matrix. | |
| */ | |
| var groups = {}; | |
| for (var i = 0; i < 20; i++) { | |
| for (var j = 0; j < 10; j++) { | |
| var value = 1 - (Math.abs(10 - i) + Math.abs(5 - j)) / 15; | |
| value *= 0.8 + Math.random() * 0.2; // Noise. | |
| var color = colorScale(value); | |
| if (!groups[color]) groups[color] = []; | |
| groups[color].push({x: i, y: j, value: value, color: color}); | |
| } | |
| } | |
| /****************************************************************************** | |
| * Render to grid. | |
| */ | |
| var wrap = svg.append('g'); | |
| Object.keys(groups).forEach(function (color) { | |
| var cell = wrap.append('g') | |
| .attr('class', 'cells') | |
| .style('filter', 'url(#gooeyCodeFilter)') | |
| .selectAll('rect') | |
| .data(groups[color]) | |
| .enter().append('rect') | |
| .attr('width', 48) | |
| .attr('height', 48) | |
| .attr('x', (d) => d.x * 48) | |
| .attr('y', (d) => d.y * 48) | |
| .attr('fill', (d) => d.color); | |
| cell.append('title') | |
| .text((d) => d.value); | |
| }); | |
| </script> |
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