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June 16, 2017 23:10
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Creating a custom chart in D3 V4
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const parseDate = d3.timeParse("%Y-%m-%e"); | |
// Get the extent of the dates in the range | |
const xDomain = d3.extent(Object.keys(changes), (d) => { return parseDate(d) }); | |
const xRange = [0, width - margins.left - margins.right]; | |
// Alogirthm to generate the circle size log scale of maxCount | |
const fillSize = (len) => { | |
if (len < 1) { | |
return 0; | |
} | |
let scale = Math.log(len) / Math.log(maxCount); | |
return parseInt(scale * 20) + 5; | |
}; | |
// Create the x scale and axis | |
const x = d3.scaleTime() | |
.domain(xDomain) | |
.range(xRange); | |
const xAxis = d3.axisBottom(x) | |
.tickFormat(d3.timeFormat("%m/%d")) | |
.ticks(d3.timeDay.every(1)); | |
// Start drawing the svg | |
const svg = d3.select(this.svg); | |
const div = d3.select("body").append("div") | |
.attr("class", "tooltip") | |
.style("opacity", 0); | |
const g = svg.append('g') | |
.attr('class', 'axis') | |
.attr('transform', `translate(${margins.left}, ${height / 2})`) | |
.call(xAxis); | |
svg.append('text') | |
.attr('transform', `translate(0, ${margins.top + 20})rotate(90)`) | |
.text('Follows'); | |
svg.append('text') | |
.attr('transform', `translate(0, ${height / 2 + 20})rotate(90)`) | |
.text('Unfollows'); | |
const f = g.append('g') | |
.selectAll('circle') | |
.data(Object.keys(changes)) | |
.enter() | |
.append('circle') | |
.attr('cx', (d) => { return x(parseDate(d)); }) | |
.attr('cy', -60) | |
.attr('r', (d) => { return fillSize(changes[d].follows.length); }) | |
.style('fill', '#00aced') | |
.on("mouseover", (d) => { | |
div.transition() | |
.duration(200) | |
.style("opacity", .9); | |
div.html(`${changes[d].follows.length} follows`) | |
.style("left", (d3.event.pageX) + "px") | |
.style("top", (d3.event.pageY - 28) + "px"); | |
}) | |
.on("mouseout", (d) => { | |
div.transition() | |
.duration(500) | |
.style("opacity", 0); | |
}) | |
.on('click', (d) => { | |
onSelect('follow', changes[d].follows); | |
}); | |
const u = g.append('g') | |
.selectAll('circle') | |
.data(Object.keys(changes)) | |
.enter() | |
.append('circle') | |
.attr('cx', (d) => { return x(parseDate(d)); }) | |
.attr('cy', 60) | |
.attr('r', (d) => { return fillSize(changes[d].unfollows.length); }) | |
.style('fill', '#FF5312') | |
.on("mouseover", function(d) { | |
div.transition() | |
.duration(200) | |
.style("opacity", .9); | |
div.html(`${changes[d].unfollows.length} unfollows`) | |
.style("left", (d3.event.pageX) + "px") | |
.style("top", (d3.event.pageY - 28) + "px"); | |
}) | |
.on("mouseout", function(d) { | |
div.transition() | |
.duration(500) | |
.style("opacity", 0); | |
}) | |
.on('click', (d) => { | |
onSelect('follow', changes[d].follows); | |
}); |
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