based on http://bl.ocks.org/mbostock/3310323 this shows how you put gaps in your line for missinng data -- here denoted by randomly inserting NaN values (so you may need to refresh the page if you don't see any breaks)
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February 10, 2018 01:45
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line interpolation with gaps
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| .dot { | |
| fill: white; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var data = d3.range(20).map(function(i) { | |
| return {x: i / 19, y: (Math.sin(i / 3) + 2) / 4}; | |
| }).map(function(d){ //remove y values at random | |
| if(Math.random() < 0.1){ | |
| return { | |
| x:d.x, | |
| y:NaN | |
| } | |
| } | |
| return d; | |
| }); | |
| var margin = {top: 20, right: 30, bottom: 30, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| var line = d3.svg.line() | |
| .interpolate(function(points){ //interpolate straight lines with gaps for NaN | |
| var section = 0; | |
| var arrays = [[]]; | |
| points.forEach(function(d,i){ | |
| if(isNaN(d[1])){ | |
| section++; | |
| arrays[section] = []; | |
| }else{ | |
| arrays[section].push(d) | |
| } | |
| }); | |
| var pathSections = []; | |
| arrays.forEach(function(points){ | |
| pathSections.push(d3.svg.line()(points)); | |
| }) | |
| var joined = pathSections.join(''); | |
| return joined.substr(1); //substring becasue D£ always adds an M to a path so we end up with MM at the start | |
| }) | |
| .x(function(d) { return x(d.x); }) | |
| .y(function(d) { return y(d.y); }); | |
| var svg = d3.select("body").append("svg") | |
| .datum(data) | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis); | |
| svg.append("path") | |
| .attr("class", "line") | |
| .attr("d", line); | |
| </script> |
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