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@mbostock
Last active Feb 9, 2016
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Monotone Interpolation
license: gpl-3.0
<!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="//d3js.org/d3.v3.min.js"></script>
<script>
var data = [
[new Date(2001, 0, 1), 1],
[new Date(2002, 0, 1), 2],
[new Date(2003, 0, 1), 2],
[new Date(2004, 0, 1), 3],
[new Date(2005, 0, 1), 4],
[new Date(2006, 0, 1), 5]
];
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.time.scale()
.domain([new Date(2001, 0, 1), new Date(2006, 0, 1)])
.range([0, width]);
var y = d3.scale.linear()
.domain([0, 6])
.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("monotone")
.x(function(d) { return x(d[0]); })
.y(function(d) { return y(d[1]); });
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);
svg.selectAll(".dot")
.data(data)
.enter().append("circle")
.attr("class", "dot")
.attr("cx", line.x())
.attr("cy", line.y())
.attr("r", 3.5);
</script>
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