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eia.js

Uploaded on Mar 07 2022 21:24 by poopscoop

// set the dimensions and margins of the graph
const margin = {top: 10, right: 30, bottom: 30, left: 60},
width = 460 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;

// append the svg object to the body of the page
const svg = d3.select("#my_dataviz")
.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})`);

//Read the data
d3.csv("/data/NY_data.csv",

// When reading the csv, I must format variables:
function(d){
return { year : d3.timeParse("%Y")(d.year), emissions : d.emissions }
}).then(

// Now I can use this dataset:
function(data) {

// Add X axis --> it is a date format
const x = d3.scaleTime()
.domain(d3.extent(data, function(d) { return d.year; }))
.range([ 0, width ]);
svg.append("g")
.attr("transform", `translate(0, ${height})`)
.call(d3.axisBottom(x));

// Max value observed:
const max = d3.max(data, function(d) { return +d.emissions; })

// Add Y axis
const y = d3.scaleLinear()
.domain([0, max])
.range([ height, 0 ]);
svg.append("g")
.call(d3.axisLeft(y));

// Set the gradient
svg.append("linearGradient")
.attr("id", "line-gradient")
.attr("gradientUnits", "userSpaceOnUse")
.attr("x1", 0)
.attr("y1", y(0))
.attr("x2", 0)
.attr("y2", y(max))
.selectAll("stop")
.data([
{offset: "0%", color: "blue"},
{offset: "100%", color: "red"}
])
.enter().append("stop")
.attr("offset", function(d) { return d.offset; })
.attr("stop-color", function(d) { return d.color; });

// Add the line
svg.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "url(#line-gradient)" )
.attr("stroke-width", 2)
.attr("d", d3.line()
.x(function(d) { return x(d.year) })
.y(function(d) { return y(d.emissions) })
)

})

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