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SOM Animation with d3.js
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| <!doctype html> | |
| <meta charset="utf-8"> | |
| <style> | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js" type="text/javascript"></script> | |
| <script> | |
| var | |
| n = 20, // square root of number of nodes | |
| m = 1500, // number of data | |
| d = 3, // dimension of data | |
| sen = 10, //size of each node (pixel) | |
| nodes = [], | |
| data = [] | |
| ; | |
| function random(){ | |
| return Math.floor(Math.random() * 256); | |
| } | |
| // generate data | |
| for(var i = 0; i < m; i++){ | |
| data.push([random(), random(), random()]); | |
| } | |
| // initialize nodes | |
| for(var i = 0; i < n * n; i++){ | |
| nodes.push({ | |
| x: i % n, | |
| y: Math.floor(i / n), | |
| value: [random(), random(), random()] | |
| }); | |
| } | |
| function rgb(array){ | |
| return 'rgb('+ array.map(function(r){return Math.round(r);}).join(',') +')'; | |
| } | |
| var | |
| svg = d3.select('body').append('svg').attr('width', 600).attr('height', 600), | |
| margin = 30, | |
| width = n * sen, | |
| height = n * sen | |
| ; | |
| var | |
| rgb_nodes = svg.append('g').attr('class','nodes all'), | |
| r_nodes = svg.append('g').attr('class','nodes r').attr('transform', 'translate(' + (width + margin) +', 0)'), | |
| g_nodes = svg.append('g').attr('class','nodes g').attr('transform', 'translate(0, ' + (height + margin) + ')'), | |
| b_nodes = svg.append('g').attr('class','nodes b').attr('transform', 'translate(' + (width + margin) +', ' + (height + margin) +')'); | |
| rgb_nodes | |
| .selectAll('rect') | |
| .data(nodes) | |
| .enter().append('rect') | |
| .attr('x', function(node){return node.x * sen;}) | |
| .attr('y', function(node){return node.y * sen;}) | |
| .attr('width', sen) | |
| .attr('height', sen) | |
| .style('fill', function(node){return rgb(node.value);}) | |
| r_nodes | |
| .selectAll('rect') | |
| .data(nodes) | |
| .enter().append('rect') | |
| .attr('x', function(node){return node.x * sen;}) | |
| .attr('y', function(node){return node.y * sen;}) | |
| .attr('width', sen) | |
| .attr('height', sen) | |
| .style('fill', function(node){return rgb([node.value[0], 0, 0]);}) | |
| g_nodes | |
| .selectAll('rect') | |
| .data(nodes) | |
| .enter().append('rect') | |
| .attr('x', function(node){return node.x * sen;}) | |
| .attr('y', function(node){return node.y * sen;}) | |
| .attr('width', sen) | |
| .attr('height', sen) | |
| .style('fill', function(node){return rgb([0, node.value[1], 0]);}) | |
| b_nodes | |
| .selectAll('rect') | |
| .data(nodes) | |
| .enter().append('rect') | |
| .attr('x', function(node){return node.x * sen;}) | |
| .attr('y', function(node){return node.y * sen;}) | |
| .attr('width', sen) | |
| .attr('height', sen) | |
| .style('fill', function(node){return rgb([0, 0, node.value[2]]);}) | |
| // labels | |
| rgb_nodes.append('text').text('rgb').attr('x', width / 2 ).attr('y', height + 20).style('text-anchor', 'middle'); | |
| r_nodes.append('text').text('r').attr('x', width / 2 ).attr('y', height + 20).style('text-anchor', 'middle'); | |
| g_nodes.append('text').text('g').attr('x', width / 2 ).attr('y', height + 20).style('text-anchor', 'middle'); | |
| b_nodes.append('text').text('b').attr('x', width / 2 ).attr('y', height + 20).style('text-anchor', 'middle'); | |
| function distance3(a, b){ | |
| return (b[0] - a[0]) * (b[0] - a[0]) + (b[1] - a[1]) * (b[1] - a[1]) + (a[2] - b[2]) * (a[2] - b[2]); | |
| } | |
| function distance2(a, b){ | |
| return (b[0] - a[0]) * (b[0] - a[0]) + (b[1] - a[1]) * (b[1] - a[1]); | |
| } | |
| function learn(r, alpha){ | |
| var datum, | |
| min_distance, | |
| min_node, | |
| cd, | |
| r2 = r * r, | |
| d2 | |
| ; | |
| for(var i = 0; i < m; i++){ //for each datum | |
| datum = data[i]; | |
| min_distance = Number.MAX_VALUE; | |
| for(var j = 0; j < n * n; j++){ //for each node | |
| cd = distance3(datum, nodes[j].value); | |
| if(min_distance > cd){ | |
| min_distance = cd; | |
| min_node = nodes[j]; | |
| } | |
| } | |
| for(var j = 0; j < n * n; j++){ | |
| d2 = distance2([nodes[j].x, nodes[j].y], [min_node.x, min_node.y]); | |
| if(d2 < r2){ | |
| for(var k = 0; k < d; k++){ | |
| nodes[j].value[k] += alpha * Math.sqrt(d2 / r2) * (datum[k] - nodes[j].value[k]); | |
| } | |
| } | |
| } | |
| } | |
| } | |
| function update(){ | |
| rgb_nodes.selectAll('rect').transition().style('fill', function(node){return rgb(node.value);}); | |
| r_nodes.selectAll('rect').transition().style('fill', function(node){return rgb([node.value[0], 0, 0]);}); | |
| g_nodes.selectAll('rect').transition().style('fill', function(node){return rgb([0, node.value[1], 0]);}); | |
| b_nodes.selectAll('rect').transition().style('fill', function(node){return rgb([0, 0, node.value[2]]);}); | |
| } | |
| var r = 10, alpha = 1, iteration = 150, count = 0; | |
| var timer = setInterval(function(){ | |
| count ++; | |
| if(count > iteration){ | |
| clearInterval(timer); | |
| return; | |
| } | |
| learn(1 + r, alpha); | |
| update(); | |
| r *= 0.975; | |
| alpha *= 0.985; | |
| console.log(1 + r, alpha); | |
| }, 300); | |
| </script> | |
| </body> |
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