A custom line interpolator with horizontal tangents.
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Sankey Interpolation
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| license: gpl-3.0 |
This file contains 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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| x | y | |
|---|---|---|
| 0 | 1 | |
| 1 | 5 | |
| 2 | 3 | |
| 3 | 8 | |
| 4 | 5 |
This file contains 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"> | |
| <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; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| 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() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .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(interpolateSankey) | |
| .x(function(d) { return x(d.x); }) | |
| .y(function(d) { return y(d.y); }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| d3.csv("data.csv", function(error, data) { | |
| if (error) throw error; | |
| data.forEach(function(d) { | |
| d.x = +d.x; | |
| d.y = +d.y; | |
| }); | |
| x.domain(d3.extent(data, function(d) { return d.x; })); | |
| y.domain(d3.extent(data, function(d) { return d.y; })); | |
| 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") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| }); | |
| function interpolateSankey(points) { | |
| var x0 = points[0][0], y0 = points[0][1], x1, y1, x2, | |
| path = [x0, ",", y0], | |
| i = 0, | |
| n = points.length; | |
| while (++i < n) { | |
| x1 = points[i][0], y1 = points[i][1], x2 = (x0 + x1) / 2; | |
| path.push("C", x2, ",", y0, " ", x2, ",", y1, " ", x1, ",", y1); | |
| x0 = x1, y0 = y1; | |
| } | |
| return path.join(""); | |
| } | |
| </script> |
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