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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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.axis--x path { |
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display: none; |
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} |
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.line { |
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fill: none; |
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stroke: steelblue; |
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stroke-width: 1.5px; |
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} |
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.focus text { |
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text-anchor: middle; |
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text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff; |
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} |
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.voronoi path { |
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fill: none; |
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pointer-events: all; |
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} |
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.voronoi--show path { |
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stroke: red; |
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stroke-opacity: 0.2; |
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} |
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.city--hover { |
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stroke: #000; |
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} |
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#form { |
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position: absolute; |
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top: 20px; |
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right: 30px; |
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} |
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</style> |
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<svg width="960" height="500"></svg> |
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<label id="form" for="show-voronoi"> |
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Show Voronoi |
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<input type="checkbox" id="show-voronoi" disabled> |
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</label> |
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<script src="//d3js.org/d3.v4.min.js"></script> |
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<script> |
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var svg = d3.select("svg"), |
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margin = {top: 20, right: 80, bottom: 30, left: 50}, |
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width = svg.attr("width") - margin.left - 2 * margin.right, // set the line plot area slightly compacted to the left, so that the hover/click effect of text won't overlapped |
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height = svg.attr("height") - margin.top - margin.bottom, |
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g = svg.append("g").attr("transform", translate(margin.left, margin.top)); |
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// voronoi global variable, focus for hovering + zooming |
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var voronoiGroup, focus; |
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// setup clip path (for limiting zoom) |
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g.append("clipPath") |
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.attr("id", "clip") |
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.append("rect") |
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.attr("width", width) |
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.attr("height", height); |
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var parseTime = d3.timeParse("%Y%m%d"); |
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// use for general linking in between click event and mouse-over event |
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var clickedStates = d3.map(); |
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var x = d3.scaleTime().range([0, width]), |
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y = d3.scaleLinear().range([height, 0]), |
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z = d3.scaleOrdinal(d3.schemeCategory10), |
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xz = x; // used for scaling x position when zoom, initially set as x, if zoomed, the d3.event.rescaleX will be set as this |
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// voronoi: data binded by d.values from cities -> each city's d.values |
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var voronoi = d3.voronoi() |
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.x(function(d) {return xz(d.date); }) |
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.y(function(d) {return y(d.temperature); }) |
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// set voronoi area EXACTLY fit with the line point max min boundary |
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.extent([[xz(x.domain()[0]) , y(y.domain()[1])], [xz(x.domain()[1]), y(y.domain()[0])]]); |
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var line = d3.line() |
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.curve(d3.curveBasis) |
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.x(function(d) { return xz(d.date); }) |
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.y(function(d) { return y(d.temperature); }); |
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// for hovering effect -> circle in voronoi |
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focus = g.append("g") |
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.attr("class", "focus") |
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// .attr("clip-path","url(#clip)") |
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.attr("transform", translate(-100,-100)); |
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focus.append("circle") |
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.attr("r", 3.5) |
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.attr("fill", "red") |
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.attr("stroke", "black") |
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.attr("stroke-width", 3); |
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focus.append("text") |
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.attr("y", -10); |
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// zoom effect |
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var zoom = d3.zoom() |
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.scaleExtent([1 / 4, 15000]) |
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// change with the scaledX position - use xz!!! |
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.translateExtent([[xz(xz.domain()[0]), -Infinity], [xz(xz.domain()[1])+200, Infinity]]) |
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.on("zoom", zoomed); |
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d3.tsv("data.tsv", type, function(error, data) { |
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if (error) throw error; |
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// zoom effect setup |
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cities = data.columns.slice(1).map(function(id) { |
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return { |
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id: id, |
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values: data.map(function(d) { |
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return {date: d.date, temperature: d[id]}; |
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}) |
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}; |
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}); |
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x.domain(d3.extent(data, function(d) { return d.date; })); |
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y.domain([ |
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d3.min(cities, function(c) { return d3.min(c.values, function(d) { return d.temperature; }); }), |
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d3.max(cities, function(c) { return d3.max(c.values, function(d) { return d.temperature; }); }) |
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]); |
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z.domain(cities.map(function(c) { return c.id; })); |
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g.append("g") |
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.attr("class", "axis axis--x") |
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.attr("transform", translate(0, height)) |
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.call(d3.axisBottom(x)); |
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g.append("g") |
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.attr("class", "axis axis--y") |
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.call(d3.axisLeft(y)) |
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.append("text") |
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.attr("transform", "rotate(-90)") |
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.attr("y", 6) |
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.attr("dy", "0.61em") |
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.attr("dx", "1.8em") |
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.attr("fill", "#000") |
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.text("Temperature, ºF"); |
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var city = g.selectAll(".city") |
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.data(cities) |
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.enter() |
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.append("g") |
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// add id on each cities (easier in selecting) |
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.attr("id", function(d){return formatLetter(d.id)}) // use formatLetter (consider edge case like San Francisco, San Bruno, San Jose etc.) |
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.attr("class", "city"); |
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// use a easier draw path function |
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drawPath(city); |
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// setup voronoi data |
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cities.map(function(c1){ |
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c1.values.forEach(function(c2){ |
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// set line associate with each values |
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c2.city = {line: c1.line, values: c1.values, name: c1.id}; |
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}) |
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}) |
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city.append("text") |
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.datum(function(d) { return {id: d.id, value: d.values[d.values.length - 1]}; }) |
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// add text offset // zxc |
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.attr("transform", function(d) { return translate(xz(d.value.date)+30, y(d.value.temperature))}) |
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.attr("x", 3) |
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.attr("dy", "0.35em") |
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.style("font", "10px sans-serif") |
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.style("cursor", "pointer") |
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.text(function(d) { return d.id; }) |
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.on("click", function(d){ |
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var onClick = d3.select(this).classed("onClick"); |
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if(!onClick){ |
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clickedStates.set(this.parentNode.id, true); |
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g.select("#"+this.parentNode.id).select("path").remove(); |
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} |
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else { |
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clickedStates.remove(this.parentNode.id); |
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// update path line |
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drawPath(g.select("#"+ this.parentNode.id)); |
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} |
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// toogle on/off flag |
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d3.select(this).classed("onClick", !onClick); |
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}) |
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.on("mouseover", function(d){ |
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// if this path is not disabled, bring this line to front, color other line to gray |
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var onClick = d3.select(this).classed("onClick"); |
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if(!onClick){ |
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g.select("#"+ this.parentNode.id).raise(); |
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g.selectAll(".city").filter(function(c){ |
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// return city that is not hover |
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return d.id != c.id; |
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}) |
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.select("path") |
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.style("stroke", "lightgray"); |
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} |
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}) |
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.on("mouseout", function(d){ |
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// resume all cities line color |
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g.selectAll(".city") |
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.select("path") |
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.style("stroke", function(city){ |
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return z(city.id); |
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}) |
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}) |
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// create voronoi group |
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voronoiGroup = g.append("g") |
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.attr("class", "voronoi") |
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// clip the zoom area |
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.attr("clip-path","url(#clip)") |
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.style("pointer-events", "all"); |
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// for setting up voronoi group |
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drawVoronoi(); |
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// show voronoi option - check the voronoi area |
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// Debug Issues: (adjust voronoi width to enabled text hovering/click effect). Previously the voronoi area overlapped text |
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d3.select("#show-voronoi") |
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.property("disabled", false) |
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.on("change", function() { voronoiGroup.classed("voronoi--show", this.checked); }); |
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}); |
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function drawVoronoi(){ |
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// merge all lines' points' values |
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all = d3.merge(cities.map(function(d) {return d.values;})); |
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voronoiGroup.selectAll("path") |
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.data(voronoi.polygons(all)) |
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.enter() |
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.append("path") |
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.attr("class", function(d) { |
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try { |
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return formatLetter(d.data.city.name); |
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}catch (e) {} |
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}) |
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// .attr("id", function(d){return formatLetter(d.id)}) |
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.attr("d", function(d) {return d ? "M" + d.join("L") + "Z" : null;}) |
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.on("mouseover", function(d) { |
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try { |
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// get class name of this path |
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if(!clickedStates.has(this.className.baseVal)){ |
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// if scaled x mouseover out of plot boundaries, don't show the hover effect |
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if(!(xz(d.data.date) < x.range()[0]) && !(xz(d.data.date) > x.range()[1])){ |
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// transform the focus (label for city and temperature) |
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focus.attr("transform", translate(xz(d.data.date), y(d.data.temperature))); |
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// draw city name and temperature |
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focus.select("text") |
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.style("font-size", 9) |
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.style("font-weight", "bolder") |
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.attr("dy", -5) |
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// "\u00A0" = add spacebar |
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.text(d.data.city.name + "\u00A0" + "\u00A0" + d.data.temperature + "ºF"); |
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// use hover class |
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d3.select(d.data.city.line).classed("city--hover", true); |
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// add as the last child |
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d.data.city.line.parentNode.appendChild(d.data.city.line); |
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// raise the text above all the line! |
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focus.raise(); |
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} |
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} |
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}catch (e){} |
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}) |
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.on("mouseout", function(d) { |
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d3.select(d.data.city.line).classed("city--hover", false); |
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focus.attr("transform", translate(-100, -100)); |
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}) |
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.call(zoom); |
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} |
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// zoom function |
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function zoomed() { |
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// rescale x position |
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xz = d3.event.transform.rescaleX(x); |
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// x axis change when zoom |
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g.select(".axis--x") |
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.call(d3.axisBottom(x).scale(xz)); |
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// redraw new path when zooming |
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g.selectAll(".city").selectAll("path.line") |
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.attr("d", function(d){return line(d.values)}); |
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} |
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// easier for drawing path, based on pass in elem |
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function drawPath(elem) { |
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elem.append("path") |
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.attr("class", "line") |
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.attr("d", function(d) {d.line = this; return line(d.values);}) |
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.attr("clip-path", "url(#clip)") |
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.style("fill", "none") |
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.style("stroke", function(d) { return z(d.id); }); |
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} |
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// for formatting id values |
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function formatLetter(state){ |
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return state.replace(/[^a-zA-Z]/g, "_"); |
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} |
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function type(d, _, columns) { |
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d.date = parseTime(d.date); |
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for (var i = 1, n = columns.length, col; i < n; ++i){ |
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d[col = columns[i]] = +d[col]; |
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} |
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return d; |
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} |
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function translate(x, y) { |
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return "translate(" + String(x) + "," + String(y) + ")"; |
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} |
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</script> |