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June 19, 2020 21:54
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <style> | |
| body { | |
| margin:auto; | |
| width: 885px; | |
| font: 10px arial; | |
| padding: 25px; | |
| } | |
| .y-axis line { | |
| opacity:.2; | |
| } | |
| .y-axis path { | |
| display:none; | |
| } | |
| .line { | |
| fill: none; | |
| stroke-width: 1.5px; | |
| opacity:.75; | |
| } | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .lineHoverText { | |
| text-shadow: | |
| -2px -2px 0 #fff, | |
| 2px -2px 0 #fff, | |
| -2px 2px 0 #fff, | |
| 2px 2px 0 #fff; | |
| } | |
| .hoverCircle { | |
| opacity: .75; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <font style="font-size:11px;">Change metric:</font> | |
| <select id="selectbox"> | |
| <option value="_1">Fahrenheit</option> | |
| <option value="_2">Celsius</option> | |
| </select> | |
| <svg id="chart" width="850" height="410"></svg> | |
| <script> | |
| d3.csv("data.csv").then(d => chart(d)) | |
| function chart(data) { | |
| var keys = data.columns.slice(1); | |
| var parseTime = d3.timeParse("%Y%m%d"), | |
| formatDate = d3.timeFormat("%Y-%m-%d"), | |
| bisectDate = d3.bisector(d => d.date).left, | |
| formatValue = d3.format(",.0f"); | |
| data.forEach(function(d) { | |
| d.date = parseTime(d.date); | |
| return d; | |
| }) | |
| var svg = d3.select("#chart"), | |
| margin = {top: 15, right: 35, bottom: 15, left: 35}, | |
| width = +svg.attr("width") - margin.left - margin.right, | |
| height = +svg.attr("height") - margin.top - margin.bottom; | |
| var x = d3.scaleTime() | |
| .rangeRound([margin.left, width - margin.right]) | |
| .domain(d3.extent(data, d => d.date)) | |
| var y = d3.scaleLinear() | |
| .rangeRound([height - margin.bottom, margin.top]); | |
| var z = d3.scaleOrdinal(d3.schemeCategory10); | |
| var line = d3.line() | |
| .curve(d3.curveCardinal) | |
| .x(d => x(d.date)) | |
| .y(d => y(d.degrees)); | |
| svg.append("g") | |
| .attr("class","x-axis") | |
| .attr("transform", "translate(0," + (height - margin.bottom) + ")") | |
| .call(d3.axisBottom(x).tickFormat(d3.timeFormat("%b"))); | |
| svg.append("g") | |
| .attr("class", "y-axis") | |
| .attr("transform", "translate(" + margin.left + ",0)"); | |
| var focus = svg.append("g") | |
| .attr("class", "focus") | |
| .style("display", "none"); | |
| focus.append("line").attr("class", "lineHover") | |
| .style("stroke", "#999") | |
| .attr("stroke-width", 1) | |
| .style("shape-rendering", "crispEdges") | |
| .style("opacity", 0.5) | |
| .attr("y1", -height) | |
| .attr("y2",0); | |
| focus.append("text").attr("class", "lineHoverDate") | |
| .attr("text-anchor", "middle") | |
| .attr("font-size", 12); | |
| var overlay = svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("x", margin.left) | |
| .attr("width", width - margin.right - margin.left) | |
| .attr("height", height) | |
| update(d3.select('#selectbox').property('value'), 0); | |
| function update(input, speed) { | |
| var copy = keys.filter(f => f.includes(input)) | |
| var cities = copy.map(function(id) { | |
| return { | |
| id: id, | |
| values: data.map(d => {return {date: d.date, degrees: +d[id]}}) | |
| }; | |
| }); | |
| y.domain([ | |
| d3.min(cities, d => d3.min(d.values, c => c.degrees)), | |
| d3.max(cities, d => d3.max(d.values, c => c.degrees)) | |
| ]).nice(); | |
| svg.selectAll(".y-axis").transition() | |
| .duration(speed) | |
| .call(d3.axisLeft(y).tickSize(-width + margin.right + margin.left)) | |
| var city = svg.selectAll(".cities") | |
| .data(cities); | |
| city.exit().remove(); | |
| city.enter().insert("g", ".focus").append("path") | |
| .attr("class", "line cities") | |
| .style("stroke", d => z(d.id)) | |
| .merge(city) | |
| .transition().duration(speed) | |
| .attr("d", d => line(d.values)) | |
| tooltip(copy); | |
| } | |
| function tooltip(copy) { | |
| var labels = focus.selectAll(".lineHoverText") | |
| .data(copy) | |
| labels.enter().append("text") | |
| .attr("class", "lineHoverText") | |
| .style("fill", d => z(d)) | |
| .attr("text-anchor", "start") | |
| .attr("font-size",12) | |
| .attr("dy", (_, i) => 1 + i * 2 + "em") | |
| .merge(labels); | |
| var circles = focus.selectAll(".hoverCircle") | |
| .data(copy) | |
| circles.enter().append("circle") | |
| .attr("class", "hoverCircle") | |
| .style("fill", d => z(d)) | |
| .attr("r", 2.5) | |
| .merge(circles); | |
| svg.selectAll(".overlay") | |
| .on("mouseover", function() { focus.style("display", null); }) | |
| .on("mouseout", function() { focus.style("display", "none"); }) | |
| .on("mousemove", mousemove); | |
| function mousemove() { | |
| var x0 = x.invert(d3.mouse(this)[0]), | |
| i = bisectDate(data, x0, 1), | |
| d0 = data[i - 1], | |
| d1 = data[i], | |
| d = x0 - d0.date > d1.date - x0 ? d1 : d0; | |
| focus.select(".lineHover") | |
| .attr("transform", "translate(" + x(d.date) + "," + height + ")"); | |
| focus.select(".lineHoverDate") | |
| .attr("transform", | |
| "translate(" + x(d.date) + "," + (height + margin.bottom) + ")") | |
| .text(formatDate(d.date)); | |
| focus.selectAll(".hoverCircle") | |
| .attr("cy", e => y(d[e])) | |
| .attr("cx", x(d.date)); | |
| focus.selectAll(".lineHoverText") | |
| .attr("transform", | |
| "translate(" + (x(d.date)) + "," + height / 2.5 + ")") | |
| .text(e => e + " " + "º" + formatValue(d[e])); | |
| x(d.date) > (width - width / 4) | |
| ? focus.selectAll("text.lineHoverText") | |
| .attr("text-anchor", "end") | |
| .attr("dx", -10) | |
| : focus.selectAll("text.lineHoverText") | |
| .attr("text-anchor", "start") | |
| .attr("dx", 10) | |
| } | |
| } | |
| var selectbox = d3.select("#selectbox") | |
| .on("change", function() { | |
| update(this.value, 750); | |
| }) | |
| } | |
| </script> | |
| </body> |
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