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<meta charset="utf-8">
<style> /* set the CSS */
.line { fill: black; }
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 50, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// set the ranges
var x = d3.scaleBand()
.range([0, width])
.padding(50);
var y = d3.scaleLinear()
.range([height, 0]);
// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
console.log("x1996:", x(+'1996'));
console.log("x2001:", x(+'2001'));
console.log("x2014:", x(+'2014'));
//line function
var line = d3.line()
.x(function(d) { console.log("x:", x(d.key));
return x(d.key); }) // set the x values for the line generator
.y(function(d) { console.log("y:", y(d.value.sumworth));return y(d.value.sumworth); }) // set the y values for the line generator
.curve(d3.curveMonotoneX) // apply smoothing to the line
// get the billionaires data
d3.csv("billionaires.csv", function(error, data) {
if (error) throw error;
console.log(data);
var worthMap = new Map();
data.forEach(function(d) {
d.year = d.year;
d['worth in billions'] = +d['worth in billions'];
});
var nested_data = d3.nest()
.key(function(d) { return d.year; })
.rollup(function(worth) { return { "sumworth": d3.sum(worth, function(d) {return parseFloat(+d['worth in billions']);})} })
.entries(data);
console.log("nested_data:");
console.log(nested_data);
// data.forEach(function(d) {
// if (worthMap.has(d.year)) {
// sum = worthMap.get(d.year)
// sum = sum + (+d['worth in billions'])
// worthMap.set(d.year, sum);
// }else {
// worthMap.set(d.year, +d['worth in billions']);
// }
// });
// console.log(worthMap);
// var arr = Array.from(worthMap.values());
// Scale the range of the data in the domains
x.domain(nested_data.map(function(d) { return d.key; }));
y.domain([0, d3.max(nested_data, function(d) { return +d.value.sumworth; })]);
// // add the x Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", ".8em")
.style("font-size", "15px")
.attr("dy", ".75em")
// add the y Axis
svg.append("g")
.call(d3.axisLeft(y));
// draw the line for the line chart
svg.append("path")
.datum(nested_data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("stroke-width", 1.5)
.attr("d", line);
svg.append("text")
.attr("text-anchor", "middle") // this makes it easy to centre the text as the transform is applied to the anchor
.attr("transform", "translate("+ margin.right +","+(height/2)+")rotate(-90)") // text is drawn off the screen top left, move down and out and rotate
.text("Total Worth in Billions");
svg.append("text")
.attr("text-anchor", "middle") // this makes it easy to centre the text as the transform is applied to the anchor
.attr("transform", "translate("+ (width/2) +","+(height+margin.bottom)+")") // text is drawn off the screen top left, move down and out and rotate
.text("Year");
});
</script>
<p><a href ="https://bl.ocks.org/elt12njo/76b484f5187c7ecfc83070dd81897327/6741bd95237f3ed45867a843e8e5403b90386639">Reference</a>
</p>
</body>
https://d3js.org/d3.v4.min.js