157 lines
3.8 KiB
JavaScript
157 lines
3.8 KiB
JavaScript
// Dimensions of chart.
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let margin = { top: 30, right: 10, bottom: 30, left: 45 },
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// width = parseInt(d3.select('#chart').style('width'), 10) - margin.left - margin.right,
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width = 600 - margin.left - margin.right,
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height = width*.8 - margin.top - margin.bottom;
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let svg = d3.select("#chart").append("svg")
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.attr("width", width + margin.left + margin.right)
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.attr("height", height + margin.top + margin.bottom)
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.append("g")
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
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// Scales: x and y
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let x = d3.scaleLinear()
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.domain([1909, 2017])
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.range([0, width]);
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let y = d3.scaleLinear()
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.domain([0, 100])
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.range([height, 0]);
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// Geometries
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let area = d3.area()
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.x(d => x(d.year))
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.y1(d => y(d.amt));
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let line = d3.line()
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.x(d => x(d.year))
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.y(d => y(d.amt));
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let xAxis, yAxis, xAxisEl, yAxisEL;
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let meats, beef, chicken;
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// Load data
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const meatData = Promise.all([
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d3.csv("data/beef-vs-chicken-difference.csv", d3.autoType)
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]);
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meatData.then(function(data) {
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meats = data[0];
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console.log(meats);
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svg.datum(meats);
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// Initialize chart now that data is loaded.
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initChart();
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});
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function initChart() {
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// x-axis
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xAxis = d3.axisBottom(x)
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.ticks(4)
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.tickFormat(d => d)
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.tickSize(-height-8)
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.tickPadding(5);
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xAxisEl = svg.append("g")
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.attr("class", "x axis bottom")
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.attr("transform", "translate(0,"+(height+8)+")");
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xAxisEl.call(xAxis);
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// y-axis
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yAxis = d3.axisLeft(y)
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// .ticks(7)
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.ticks(5)
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.tickSize(-width-8)
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.tickPadding(5);
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yAxisEl = svg.append("g")
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.attr("class", "y axis left")
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.attr("transform", "translate("+(-8)+",0)");
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yAxisEl.append("text")
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.attr("class", "axistitle")
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.attr("x", 0).attr("y", 0)
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.attr("dx", "-2.25em")
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.attr("dy", "-1.5em")
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.style("text-anchor", "start")
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.text("Pounds per capita");
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yAxisEl.call(yAxis);
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// Area clipping paths
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svg.append("clipPath")
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.attr("id", "clip-above")
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.append("path")
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.attr("d", d3.area()
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.x(d => x(d.Year))
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.y0(0)
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.y1(d => y(d.Chicken)));
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svg.append("clipPath")
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.attr("id", "clip-below")
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.append("path")
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.attr("d", d3.area()
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.x(d => x(d.Year))
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.y0(height)
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.y1(d => y(d.Chicken)));
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// Area differences
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svg.append("path")
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.attr("class", "area above")
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.attr("clip-path", "url(#clip-above)")
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.attr("fill", "#fdad94")
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.attr("d", d3.area()
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.x(d => x(d.Year)).y0(height).y1(d => y(d.Beef)));
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svg.append("path")
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.attr("class", "area below")
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.attr("fill", "#f9e59f")
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.attr("clip-path", "url(#clip-below)")
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.attr("d", d3.area()
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.x(d => x(d.Year)).y0(0).y1(d => y(d.Beef)));
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// Lines
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svg.append("path")
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.attr("class", "line chicken")
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.attr("fill", "none")
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.attr("stroke", "#bf980d")
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.attr("stroke-width", "2px")
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.attr("d", d3.line()
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.x(d => x(d.Year))
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.y(d => y(d.Chicken)));
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svg.append("path")
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.attr("class", "line beef")
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.attr("fill", "none")
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.attr("stroke", "#fb470e")
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.attr("stroke-width", "2px")
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.attr("d", d3.line()
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.x(d => x(d.Year))
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.y(d => y(d.Beef)));
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setAnnotation();
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}
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function setAnnotation() {
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svg.append("text")
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.attr("class", "mainlab")
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.attr("fill", "#fb470e")
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.attr("x", x(1962))
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.attr("y", y(40))
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.text("BEEF");
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svg.append("text")
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.attr("text-anchor", "end")
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.attr("class", "mainlab")
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.attr("fill", "#bf980d")
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.attr("x", x(2017))
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.attr("y", y(65))
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.text("CHICKEN");
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}
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