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multiple_lines_labels_tooltips.html
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<!DOCTYPE html>
<!-- Modification of an example by Scott Murray from Knight D3 course -->
<html lang="en">
<head>
<meta charset="utf-8">
<title>Line Chart with Multiple Lines</title>
<style type="text/css">
body {
background-color: white;
font-family: Helvetica, Arial, sans-serif;
}
h1 {
font-size: 24px;
margin: 0;
}
p {
font-size: 14px;
margin: 10px 0 0 0;
width: 700px;
}
svg {
background-color: white;
}
path.line {
fill: none;
stroke: gray;
}
.unfocused {
opacity: .5;
stroke-width: 1px;
}
.focused {
opacity: 1;
stroke-width: 2px;
}
.axis path,
.axis line {
fill: none;
stroke: black;
stroke-width: 1px;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
text.linelabel {
font-size: 9pt;
color: gray;
}
circle {
fill: gray;
}
.tooltip {
position: absolute;
z-index: 10;
}
.tooltip p {
background-color: white;
border: gray 1px solid;
padding: 2px;
max-width: 180px;
}
</style>
</head>
<body>
<h1>CO2 Emissions by Country</h1>
<p>Carbon dioxide emissions, 1961-2010. Data not available for the entire period for all countries. Source: <a href="http://data.worldbank.org/indicator/EN.ATM.CO2E.KT?page=6">World Bank</a>, 2014. (Based on a modified example from Scott Murray.)</p>
<p>Mouse over the lines to see data points and highlight a line.</p>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
<script type="text/javascript">
//Dimensions and padding
var fullwidth = 700;
var fullheight = 600;
var margin = {top: 20, right: 100, bottom: 40, left:100};
var width = fullwidth - margin.left - margin.right;
var height = fullheight - margin.top - margin.bottom;
//Set up date formatting and years
var dateFormat = d3.time.format("%Y");
//Set up scales
var xScale = d3.time.scale()
.range([ 0, width ]);
var yScale = d3.scale.linear()
.range([ 0, height ]);
//Configure axis generators
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(15)
.tickFormat(function(d) {
return dateFormat(d);
})
.outerTickSize([0])
.innerTickSize([0]);
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.outerTickSize([0]);
//Configure line generator
// each line dataset must have a d.year and a d.amount for this to work.
var line = d3.svg.line()
.x(function(d) {
return xScale(dateFormat.parse(d.year));
})
.y(function(d) {
return yScale(+d.amount);
});
//Create the empty SVG image
var svg = d3.select("body")
.append("svg")
.attr("width", fullwidth)
.attr("height", fullheight)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var tooltip = d3.select("body")
.append("div")
.attr("class", "tooltip");
//Load data
d3.csv("data/co2_emissions.csv", function(data) {
//New array with all the years, for referencing later
var years = ["1961", "1962", "1963", "1964", "1965", "1966", "1967", "1968", "1969", "1970", "1971", "1972", "1973", "1974", "1975", "1976", "1977", "1978", "1979", "1980", "1981", "1982", "1983", "1984", "1985", "1986", "1987", "1988", "1989", "1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010"];
// or you could get this by doing:
// var years = d3.keys(data[0]).slice(0, 54-4); //
//Create a new, empty array to hold our restructured dataset
var dataset = [];
//Loop once for each row in data
data.forEach(function (d, i) {
var myEmissions = [];
//Loop through all the years - and get the emissions for this data element
years.forEach(function (y) {
// If value is not empty
if (d[y]) {
//Add a new object to the new emissions data array - for year, amount
myEmissions.push({
country: d.countryName, // we can put the country in here too. It won't hurt.
year: y,
amount: d[y] // this is the value for, for example, d["2004"]
});
}
});
//Create new object with this country's name and empty array
// d is the current data row... from data.forEach above.
dataset.push( {
country: d.countryName,
emissions: myEmissions // we just built this!
} );
});
//Uncomment to log the original data to the console
// console.log(data);
//Uncomment to log the newly restructured dataset to the console
console.log(dataset);
//Set scale domains - max and mine of the years
xScale.domain(
d3.extent(years, function(d) {
return dateFormat.parse(d);
}));
// max of emissions to 0 (reversed, remember)
yScale.domain([
d3.max(dataset, function(d) {
return d3.max(d.emissions, function(d) {
return +d.amount;
});
}),
0
]);
//Make a group for each country
var groups = svg.selectAll("g")
.data(dataset)
.enter()
.append("g");
//Within each group, create a new line/path,
//binding just the emissions data to each one
groups.selectAll("path")
.data(function(d) { // because there's a group with data already...
return [ d.emissions ]; // it has to be an array for the line function
})
.enter()
.append("path")
.attr("class", "line")
.classed("unfocused", true) // they are not focused till mouseover
.attr("id", function(d) {
// we are attaching an id to the line using the countryname, replacing
// the spaces with underscores so it's a valid id.
// this will be useful when we do the mouseover and want to highlight a line too.
if (d[0] && d[0].length != 0) {
// this if-test makes sure there is an array and it's not empty.
return d[0].country.replace(/ |,|\./g, '_');
}
})
.attr("d", line);
// Tooltip dots
var circles = groups.selectAll("circle")
.data(function(d) { // because there's a group with data already...
return d.emissions; // NOT an array here.
})
.enter()
.append("circle");
circles.attr("cx", function(d) {
return xScale(dateFormat.parse(d.year));
})
.attr("cy", function(d) {
return yScale(d.amount);
})
.attr("r", 3)
.attr("id", function(d) {
return d.country.replace(/ |,|\./g, '_');
})
.style("opacity", 0); // this is optional - if you want visible dots or not!
// Adding a subtle animation to increase the dot size when over it!
circles
.on("mouseover", mouseoverFunc)
.on("mousemove", mousemoveFunc)
.on("mouseout", mouseoutFunc);
// We're putting the text label at the group level, where the country name was originally.
//We can access data here, because it's already attached!
// We use the scales to position labels at end of line.
groups.append("text")
.attr("x", function(d) {
if (d.emissions.length != 0) {
var lastYear = d.emissions[d.emissions.length-1].year;
return xScale(dateFormat.parse(lastYear));
}
})
.attr("y", function(d) {
if (d.emissions.length != 0) {
var lastAmount = d.emissions[d.emissions.length-1].amount;
return yScale(+lastAmount);
}
})
.attr("dx", "3px")
.attr("dy", "3px")
.text(function(d) {
if (d.emissions.length != 0) {
var lastAmount = d.emissions[d.emissions.length-1].amount;
if (+lastAmount > 700000) {
return d.country;
}
}
})
.attr("class", "linelabel");
//Axes
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
function mouseoverFunc(d) {
// this will highlight both a dot and its line.
var lineid = d3.select(this).attr("id");
d3.select(this)
.transition()
.style("opacity", 1)
.attr("r", 4);
d3.select("path#" + lineid).classed("focused", true).classed("unfocused", false);
tooltip
.style("display", null) // this removes the display none setting from it
.html("<p>Country: " + d.country +
"<br>Year: " + d.year +
"<br>Emissions: " + d.amount + " kt</p>");
}
function mousemoveFunc(d) {
tooltip
.style("top", (d3.event.pageY - 10) + "px" )
.style("left", (d3.event.pageX + 10) + "px");
}
function mouseoutFunc(d) {
d3.select(this)
.transition()
.style("opacity", 0)
.attr("r", 3);
d3.selectAll("path.line").classed("unfocused", true).classed("focused", false);
tooltip.style("display", "none"); // this sets it to invisible!
}
}); // end of data csv
</script>
</body>
</html>