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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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/*body { |
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background-color: whitesmoke; |
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}*/ |
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/*svg { |
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background-color: whitesmoke; |
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}*/ |
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/* setup plot area css */ |
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/*rect#plot { |
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fill: black; |
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stroke: none; |
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}*/ |
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/* make the y-axis label refer to its path color */ |
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/*.city text { |
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fill: red; |
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}*/ |
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</style> |
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<svg width="960" height="500"></svg> |
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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: 70}, |
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width = svg.attr("width") - margin.left - margin.right, |
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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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var parseTime = d3.timeParse("%Y%m%d"); |
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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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var line = d3.line() |
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/* level 1: lab point 4 */ |
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.curve(d3.curveLinear) |
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.x(function(d) { return x(d.date); }) |
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.y(function(d) { return y(d.temperature); }); |
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/* loading csv data */ |
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d3.tsv("data.tsv", type, function(error, data) { |
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if (error) throw error; |
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// console.log(data); |
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// id = cities name ["Austin", "San Francisco", "New York"] |
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var 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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/* save min and max temperature */ |
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/* level 4: lab point 1 */ |
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var minTemp, maxTemp; |
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// for the degree padding range on y axis |
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var yAxisPad = 5; |
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y.domain([ |
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// inner loop: iterate over each cities' temperatue value and get the min and max of each cities |
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// then outer loop: iterate each cities min and max temperature, and find out the minimum and maximum temperature value amongst those cities |
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/* self explaination about these yAxisPad stuff: rounding in [roof/floor](minTemp/maxTemp +- yAxisPad) depend on condition explain below: */ |
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/* Note: |
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1. if (temp +- yAxisPad) = +ve numbers, use roof |
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2. in min, if (temp +- yAxisPad) = -ve numbers, use floor |
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*/ |
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/* level 4: lab point 2 */ |
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(minTemp = d3.min(cities, function(c) { return d3.min(c.values, function(d) { return d.temperature; }) })) - yAxisPad, |
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(maxTemp = d3.max(cities, function(c) { return d3.max(c.values, function(d) { return d.temperature; }) })) + yAxisPad |
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]); |
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// debug use |
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// console.log(minTemp, maxTemp); |
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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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/* level 1: lab point 1 */ |
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.attr("transform", "translate(" + width + ", 0)") |
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// .call(d3.axisRight(y).tickFormat(function (d){return d + "%";})) |
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/* level 2: lab point 1: change y-axis ticks label to degree symbol º*/ |
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.call(d3.axisRight(y).tickFormat(function(d) {return d + "º"})) |
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.append("text") |
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/* level 1: lab point 2 */ |
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.attr("transform", "rotate(90)") |
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.attr("y", 6) |
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.attr("dy", "0.71em") |
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.attr("fill", "#000") |
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/* level 2: lab point 2 */ |
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.text("Fahrenheit"); |
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// here city = EACH city from cities list when use in accessing data |
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var city = g.selectAll("city") |
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.data(cities) |
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.enter().append("g") |
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.attr("class", "city"); |
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/* temporary showing the cities structure here for circle point implementation */ |
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// var cities = data.columns.slice(1).map(function(id) { |
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// return { |
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// id: id, |
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// |
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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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/* binding DOM tutorials: https://www.dashingd3js.com/binding-data-to-dom-elements */ |
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// .data(theData), theData = cities = [Object1, Object2, Object3], .data(theData) = access to EACH object in the Data Array (like access through forEach loop) |
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/* level 3: lab point 1 */ |
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var marks = city.append("g") |
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// how .selectAll works: https://bl.ocks.org/mbostock/5369146 |
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// multiple selector on elements using selectAll(obj1, obj2); |
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.selectAll("circle", "text") |
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/** IMPORTANT DEBUG and checking here: accessing data to implement circle point on each data values **/ |
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// console.log(cities[0].values[0].temperature); |
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// d = cities[i] |
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// values = Array[Object1, Object2], Object contain a {date: data.date, temperature: data[id]}; |
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// .data(function(d) {return d.values;}) |
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.data(function(d) {return d.values;}) |
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.enter(); |
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// tutorial abount binding circle to each data values: https://bost.ocks.org/mike/circles/ |
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// extra info: d3 function(d,i) - the meaning of i changed as data changed explain in: http://stackoverflow.com/questions/20853402/d3-functiond-i-the-meaning-of-i-changed-as-data-changed |
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/* level 3: lab point 1 */ |
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marks.append("circle") |
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.attr("cx", function(d) { return x(d.date);} ) |
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.attr("cy", function(d) { return y(d.temperature);} ) |
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.attr("r", "0.12em") |
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/* level 3: lab point 2 */ |
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// Phewww!: finally! access this -> marks dataset's PARENT NODE's __data_ property = city's data which contain the city's id = "Austin", "San Francisco", "New York" |
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.style("fill", function (d) { return z(this.parentNode.__data__.id); }); |
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/******************************************** |
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* set min and max label on the data point * |
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********************************************/ |
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// display min label on point |
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/* level 4: lab point 3 */ |
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marks.filter(function (d) {return d.temperature == minTemp;}) |
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.append("text") |
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.attr("x", function(d) {return x(d.date);}) |
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.attr("y", function(d) {return y(d.temperature);}) |
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.attr("dy", "1em") |
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.attr("dx", "-1em") |
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.style("font", "0.7em sans-serif") |
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.style("fill", function (d) { return z(this.parentNode.__data__.id); }) |
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.text(function (d) {return d.temperature + "º";}); |
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// display max label on point |
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/* level 4: lab point 3 */ |
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marks.filter(function (d) {return d.temperature == maxTemp;}) |
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.append("text") |
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.attr("x", function(d) {return x(d.date);}) |
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.attr("y", function(d) {return y(d.temperature);}) |
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.attr("dy", "-0.3em") |
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.attr("dx", "-1em") |
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.style("font", "0.7em sans-serif") |
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.style("fill", function (d) { return z(this.parentNode.__data__.id); }) |
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.text(function (d) {return d.temperature + "º";}); |
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city.append("path") |
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// here, the class=line is refer to the svg class .line above |
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.attr("class", "line") |
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// line(d.values): sub d.values as data into d3.line(arg) above |
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.attr("d", function(d) { return line(d.values); }) |
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.style("stroke", function(d) { return z(d.id); }); |
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city.append("text") |
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/* see .datum documentation: https://github.com/d3/d3-selection/blob/master/README.md#selection_datum */ |
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// d.values = each city's temperature values in Array[n1, n2, n3...] |
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/* original code */ |
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// .datum(function(d) {return {id: d.id, value: d.values[d.values.length - 1]}; }) |
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/* explaination on .datum func */ |
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// .datum(func(d): return an object {x,y} which set the z-legend stick along with the graph line) |
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// d.values[0] means that the z-legend starting with the 1st temperature data |
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// debug with -> console.log(d.values[0]) |
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.datum(function(d) {return {id: d.id, value: d.values[0]}; }) |
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/* move the cities label to left side of line graph from the first starting date data point */ |
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.attr("transform", function(d) {return "translate(" + (x(d.value.date)-margin.left) + "," + y(d.value.temperature) + ")"; }) |
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.attr("x", 3) |
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// adjusting dy so that y-axis label won't overlap with y-axis .tick text (the temp value) |
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.attr("dy", function(d) { |
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/* level 1: lab point 5 */ |
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if (d.id == "San Francisco") {v = "1.2em";} |
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else {v = "0.35em";} |
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return v; |
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} |
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) |
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// setting the slightly offset "Austin" |
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// .attr("dx", function(d) { if (d.id == "Austin") return (margin.left + offset);}) |
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// console.log(d.id.length) -> check cities length "Austin" = 6, "San Francisco" = 13, "New York" 8 to set the offset margin |
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/* level 1: Optional lab point 5 */ |
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.attr("dx", function(d) { |
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if(d.id == "Austin") return ("3.5em"); |
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else if (d.id == "New York") return ("2em"); { |
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} |
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}) |
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.style("font", "10px sans-serif") |
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/* level 1: lab point 3 */ |
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.style("fill", function (d) { return z(d.id); }) |
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.text(function(d) { return d.id; } |
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); |
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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, c; i < n; ++i) d[c = columns[i]] = +d[c]; |
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return d; |
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} |
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</script> |