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line.html
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
background-color: #F1F3F3
}
.axis {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #D4D8DA;
stroke-width: 2px;
shape-rendering: crispEdges;
}
.line {
fill: none;
stroke: #6F257F;
stroke-width: 5px;
}
.overlay {
fill: none;
pointer-events: all;
}
.focus circle {
fill: #F1F3F3;
stroke: #6F257F;
stroke-width: 5px;
}
.hover-line {
stroke: #6F257F;
stroke-width: 2px;
stroke-dasharray: 3,3;
}
</style>
<body>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
margin = {top: 20, right: 20, bottom: 30, left: 40},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var parseTime = d3.timeParse("%Y")
bisectDate = d3.bisector(function(d) { return d.year; }).left;
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
var line = d3.line()
.x(function(d) { return x(d.year); })
.y(function(d) { return y(d.value); });
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.csv("Data/data.csv", function(error, data) {
if (error) throw error;
data.forEach(function(d) {
d.year = parseTime(d.year);
d.value = +d.value;
});
x.domain(d3.extent(data, function(d) { return d.year; }));
y.domain(d3.extent(data, function(d) { return d.value;}));
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.attr("fill", "#5D6971")
.text("Rating")
.call(d3.axisLeft(y).ticks(5));
// g.append("g")
// .attr("class", "axis axis--y")
// .call(d3.axisLeft(y).ticks(5).tickFormat(function(d) { return parseInt(d); }))
// .append("text")
// .attr("class", "axis-title")
// .attr("transform", "rotate(-90)")
// .attr("y", 5)
// .attr("dy", ".71em")
// .style("text-anchor", "end")
// .attr("fill", "#5D6971")
// .text("Population)");
g.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
var focus = g.append("g")
.attr("class", "focus")
.style("display", "none");
focus.append("line")
.attr("class", "x-hover-line hover-line")
.attr("y1", 0)
.attr("y2", height);
focus.append("line")
.attr("class", "y-hover-line hover-line")
.attr("x1", width)
.attr("x2", width);
focus.append("circle")
.attr("r", 7.5);
focus.append("text")
.attr("x", 15)
.attr("dy", ".31em");
svg.append("rect")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("class", "overlay")
.attr("width", width)
.attr("height", height)
.on("mouseover", function() { focus.style("display", null); })
.on("mouseout", function() { focus.style("display", "none"); })
.on("mousemove", mousemove);
function mousemove() {
var x0 = x.invert(d3.mouse(this)[0]),
i = bisectDate(data, x0, 1),
d0 = data[i - 1],
d1 = data[i],
d = x0 - d0.year > d1.year - x0 ? d1 : d0;
focus.attr("transform", "translate(" + x(d.year) + "," + y(d.value) + ")");
focus.select("text").text(function() { return d.value; });
focus.select(".x-hover-line").attr("y2", height - y(d.value));
focus.select(".y-hover-line").attr("x2", width + width);
}
});
</script>