This line chart is constructed from a TSV file storing the daily average temperatures of New York, San Francisco and Austin over the last year. The chart employs conventional margins and a number of D3 features:
forked from mbostock's block: Multi-Series Line Chart
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<meta charset="utf-8">
<style>
/* .axis--x path {
display: none;
} */
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
</style>
<svg width="960" height="500"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
margin = {top: 20, right: 80, bottom: 30, left: 50},
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var parseTime = d3.timeParse("%Y%m%d");
var x = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
z = d3.scaleOrdinal(d3.schemeCategory10);
let xAxis = d3.axisBottom(x);
let yAxis = d3.axisLeft(y);
var line = d3.line()
.curve(d3.curveBasis)
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.temperature); });
var xGroup = g.append("g")
.attr("transform", "translate(0," + height + ")");
var zoom = d3.zoom()
.scaleExtent([1 / 4, 8])
.translateExtent([[-width, -Infinity], [2 * width, Infinity]])
.on("zoom", zoomed);
var zoomRect = svg.append("rect")
.attr("width", width)
.attr("height", height)
.attr("fill", "none")
.attr("pointer-events", "all")
.call(zoom);
g.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
d3.tsv("data.tsv", type, function(error, data) {
if (error) throw error;
var cities = data.columns.slice(1).map(function(id) {
return {
id: id,
values: data.map(function(d) {
return {date: d.date, temperature: d[id]};
})
};
});
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([
d3.min(cities, function(c) { return d3.min(c.values, function(d) { return d.temperature; }); }),
d3.max(cities, function(c) { return d3.max(c.values, function(d) { return d.temperature; }); })
]);
z.domain(cities.map(function(c) { return c.id; }));
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")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("fill", "#000")
.text("Temperature, ºF");
let activeFlagDict = {};
let filteredCityList = [];
var city = g.selectAll(".city")
.data(cities)
.enter().append("g")
.attr("class", "city");
city.append("path")
.attr("class", "line")
.attr("clip-path", "url(#clip)")
.attr("id", function(d) { return getCityIdForLine(d.id); })
.attr("d", function(d) { return line(d.values); })
.style("stroke", function(d) { return z(d.id); });
city.append("text")
.datum(function(d) { return {id: d.id, value: d.values[d.values.length - 1]}; })
.attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")"; })
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.on("click", function(d){
// Filtering
// Determine if current line is visible
let cityId = getCityIdForLine(d.id);
var active = activeFlagDict[cityId]? false : true,
newOpacity = active ? 0 : 1;
// Hide or show the elements
d3.select("#" + cityId).style("opacity", newOpacity);
// Update whether or not the elements are active
activeFlagDict[cityId] = active;
if (active){
filteredCityList.push(cityId);
}else{
let city_i = filteredCityList.indexOf(cityId);
filteredCityList.splice(city_i, 1);
}
})
// Brushing
.on("mouseover", function(d){
let cityId = getCityIdForLine(d.id);
d3.selectAll(".city")
.selectAll("path")
.filter(function(d){
return cityId != getCityIdForLine(d.id) && !filteredCityList.includes(cityId);
})
.transition()
.style("stroke", "#DCDCDC");
d3.select("g#" + cityId).raise();
})
.on("mouseout", function(d){
d3.selectAll(".city")
.selectAll("path")
.transition()
.style("stroke", function(d){
return z(d.id);
})
})
.text(function(d) { return d.id; });
});
function type(d, _, columns) {
d.date = parseTime(d.date);
for (var i = 1, n = columns.length, c; i < n; ++i) d[c = columns[i]] = +d[c];
return d;
}
function getCityIdForLine(str){
return str.split(' ').join('');
}
function zoomed() {
let xz = d3.event.transform.rescaleX(x);
xGroup.call(xAxis.scale(xz));
line.x(function(d) {
return xz(d.date)
})
g.selectAll(".line")
.attr("d", function(d){return line(d.values)});
g.selectAll(".axis--x").remove();
}
</script>
https://d3js.org/d3.v4.min.js