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Swing door trending filter
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| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <link href="main.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #ccc; | |
| shape-rendering: crispEdges; | |
| } |
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| var margin = {top: 50, right: 20, bottom: 50, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 300 - margin.top - margin.bottom | |
| var pointsNumber = 45 | |
| var Δ = 0.1 | |
| var x = d3.scale.linear() | |
| .domain([0, pointsNumber]) | |
| .range([0, width]) | |
| var y = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([height, 0]) | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| var area = svg | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")") | |
| area.append("g") | |
| .attr("class", "axis") | |
| .call(yAxis) | |
| var areaGroup = area.append('g') | |
| var sdtGroup = area.append('g') | |
| var ε = 1e-6 | |
| function filterData(d, Δ){ | |
| d = d.slice() | |
| var start = 0, | |
| result =[], | |
| trendBoundaries = [Infinity, -Infinity], | |
| currentPointBoundaries = [], | |
| prevTrendBoundaries = [], | |
| newY = d[0], | |
| lower = 0, | |
| upper = 1, | |
| pushPoint = function () { result.push({ x: start, y: newY }) } | |
| pushPoint() | |
| for (var i = 0; i < d.length; i++) { | |
| currentPointBoundaries = [ | |
| (d[i] - d[start] + Δ) / (i - start), | |
| (d[i] - d[start] - Δ) / (i - start) | |
| ] | |
| prevTrendBoundaries = trendBoundaries.slice() | |
| if (trendBoundaries[upper] < currentPointBoundaries[upper] + ε) { | |
| trendBoundaries[upper] = currentPointBoundaries[upper] | |
| } | |
| if (currentPointBoundaries[lower] < trendBoundaries[lower] + ε) { | |
| trendBoundaries[lower] = currentPointBoundaries[lower] | |
| } | |
| if (trendBoundaries[lower] < trendBoundaries[upper] + ε) { | |
| trendBoundaries = [Infinity, -Infinity] | |
| i-- | |
| newY = d3.sum(prevTrendBoundaries) * (i - start) / 2 + d[start] | |
| start = i | |
| d[start] = newY | |
| pushPoint() | |
| } | |
| } | |
| i-- | |
| if (d.length > 1) newY = d3.sum(trendBoundaries) * (i - start) / 2 + d[start] | |
| start = i | |
| pushPoint() | |
| return result | |
| } | |
| var i = 0 | |
| var currentValue = Math.random() | |
| var values = [] | |
| var limit = d3.scale.linear().clamp(true) | |
| setInterval(function(){ | |
| if (i < pointsNumber){ | |
| currentValue = limit(currentValue + .3 * Math.random() - .15 + .01 * Math.cos(i * 5)) | |
| values.push(currentValue) | |
| var circles = areaGroup.selectAll('circle') | |
| .data(values) | |
| circles.exit().remove() | |
| circles | |
| .enter().append('circle') | |
| .attr('cx', function(d, i) {return x(i) }) | |
| .attr('cy', function(d) { return y(d) }) | |
| .attr('r', 0) | |
| .attr('fill', '#aaa') | |
| .transition() | |
| .attr('r', 1.5) | |
| var data = filterData(values, Δ) | |
| var filteredDots = sdtGroup.selectAll('circle') | |
| .data(data, function (d) { return d.x + " " + d.y }) | |
| filteredDots.exit().remove() | |
| filteredDots | |
| .enter().append('circle') | |
| .attr('cx', function(d) { return x(d.x) }) | |
| .attr('cy', function(d) { return y(d.y) }) | |
| .attr('fill', '#000') | |
| .attr('r', 0) | |
| .transition() | |
| .attr('r', 1.5) | |
| var boundaries = [] | |
| function offsetLine (line, offset) { | |
| return [{x: line[0].x, y: line[0].y + offset}, {x: line[1].x, y: line[1].y + offset}] | |
| } | |
| d3.pairs(data).forEach(function(d){ | |
| boundaries.push(d) | |
| boundaries.push(offsetLine(d, Δ)) | |
| boundaries.push(offsetLine(d, -Δ)) | |
| }) | |
| var lines = areaGroup.selectAll('line') | |
| .data(boundaries, function (d) { return d[0].x + " " + d[0].y + " " + d[1].x + " " + d[1].y }) | |
| lines.exit().remove() | |
| lines.enter().append('line') | |
| .attr('stroke', '#ccc') | |
| .attr('x1', function(d) { return x(d[0].x) }) | |
| .attr('y1', function(d) { return y(d[0].y) }) | |
| .attr('x2', function(d) { return x(d[1].x) }) | |
| .attr('y2', function(d) { return y(d[1].y) }) | |
| i++ | |
| } | |
| }, 100) |
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