Monthly Archives: November 2013

Hands-on session demo (Scatterplot)

[d3-link]http://veniceatlas.epfl.ch/wp-content/uploads/2013/11/test-data.tsv[/d3-link]
[d3-source canvas=”chart”]
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 600 – margin.left – margin.right,
height = 500 – margin.top – margin.bottom;

var x = d3.scale.linear()
.range([0, width]);

var y = d3.scale.linear()
.range([height, 0]);

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
.scale(x)
.orient(“bottom”);

var yAxis = d3.svg.axis()
.scale(y)
.orient(“left”);

var svg = d3.select(“.chart”).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 + “)”);

d3.tsv(“http://veniceatlas.epfl.ch/wp-content/uploads/2013/11/test-data.tsv”, function(error, data) {
data.forEach(function(d) {
d.sepalLength = +d.sepalLength;
d.sepalWidth = +d.sepalWidth;
});

x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();

svg.append(“g”)
.attr(“class”, “x axis”)
.attr(“transform”, “translate(0,” + height + “)”)
.call(xAxis)
.append(“text”)
.attr(“class”, “label”)
.attr(“x”, width)
.attr(“y”, -6)
.style(“text-anchor”, “end”)
.text(“Sepal Width (cm)”);

svg.append(“g”)
.attr(“class”, “y axis”)
.call(yAxis)
.append(“text”)
.attr(“class”, “label”)
.attr(“transform”, “rotate(-90)”)
.attr(“y”, 6)
.attr(“dy”, “.71em”)
.style(“text-anchor”, “end”)
.text(“Sepal Length (cm)”)

svg.selectAll(“.dot”)
.data(data)
.enter().append(“circle”)
.attr(“class”, “dot”)
.attr(“r”, 3.5)
.attr(“cx”, function(d) { return x(d.sepalWidth); })
.attr(“cy”, function(d) { return y(d.sepalLength); })
.style(“fill”, function(d) { return color(d.species); });

var legend = svg.selectAll(“.legend”)
.data(color.domain())
.enter().append(“g”)
.attr(“class”, “legend”)
.attr(“transform”, function(d, i) { return “translate(0,” + i * 20 + “)”; });

legend.append(“rect”)
.attr(“x”, width – 18)
.attr(“width”, 18)
.attr(“height”, 18)
.style(“fill”, color);

legend.append(“text”)
.attr(“x”, width – 24)
.attr(“y”, 9)
.attr(“dy”, “.35em”)
.style(“text-anchor”, “end”)
.text(function(d) { return d; });

});
[/d3-source]