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World History Timeline
chart = {
let filteredData;
if(sorting !== "time") {
filteredData = [].concat.apply([], dataByRegion.map(d=>d.values));
} else {
filteredData = data.sort((a,b)=> a.start-b.start);
}
filteredData.forEach(d=> d.color = d3.color(color(d.region)))
let parent = this;
if (!parent) {
parent = document.createElement("div");
const svg = d3.select(DOM.svg(width, height));
const g = svg.append("g").attr("transform", (d,i)=>`translate(${margin.left} ${margin.top})`);
const groups = g
.selectAll("g")
.data(filteredData)
.enter()
.append("g")
.attr("class", "civ")
const tooltip = d3.select(document.createElement("div")).call(createTooltip);
const line = svg.append("line").attr("y1", margin.top-10).attr("y2", height-margin.bottom).attr("stroke", "rgba(0,0,0,0.2)").style("pointer-events","none");
groups.attr("transform", (d,i)=>`translate(0 ${y(i)})`)
groups
.each(getRect)
.on("mouseover", function(d) {
d3.select(this).select("rect").attr("fill", d.color.darker())
tooltip
.style("opacity", 1)
.html(getTooltipContent(d))
})
.on("mouseleave", function(d) {
d3.select(this).select("rect").attr("fill", d.color)
tooltip.style("opacity", 0)
})
svg
.append("g")
.attr("transform", (d,i)=>`translate(${margin.left} ${margin.top-10})`)
.call(axisTop)
svg
.append("g")
.attr("transform", (d,i)=>`translate(${margin.left} ${height-margin.bottom})`)
.call(axisBottom)
// 根据鼠标的为止调整 tooltip 的定位，避免靠边时显示不完全
svg.on("mousemove", function(d) {
let [x,y] = d3.mouse(this);
line.attr("transform", `translate(${x} 0)`);
y +=20;
if(x>width/2) x-= 100;
tooltip
.style("left", x + "px")
.style("top", y + "px")
})
parent.appendChild(svg.node());
parent.appendChild(tooltip.node());
parent.groups = groups;
} else {
const civs = d3.selectAll(".civ")
civs.data(filteredData, d=>d.civilization)
.transition()
// .delay((d,i)=>i*10)
.ease(d3.easeCubic)
.attr("transform", (d,i)=>`translate(0 ${y(i)})`)
}
return parent
}
getTooltipContent = function(d) {
return `<b>${d.civilization}</b>
<br/>
<b style="color:${d.color.darker()}">${d.region}</b>
<br/>
${formatDate(d.start)} - ${formatDate(d.end)}
`
}
y= d3.scaleBand()
.domain(d3.range(data.length))
.range([0,height - margin.bottom - margin.top])
.padding(0.2)
x = d3.scaleLinear()
.domain([d3.min(data, d => d.start), d3.max(data, d => d.end)])
.range([0, width - margin.left - margin.right])
createTooltip = function(el) {
el
.style("position", "absolute")
.style("pointer-events", "none")
.style("top", 0)
.style("opacity", 0)
.style("background", "white")
.style("border-radius", "5px")
.style("box-shadow", "0 0 10px rgba(0,0,0,.25)")
.style("padding", "10px")
.style("line-height", "1.3")
.style("font", "11px sans-serif")
}
getRect = function(d){
const el = d3.select(this);
const sx = x(d.start);
const w = x(d.end) - x(d.start);
const isLabelRight =(sx > width/2 ? sx+w < width : sx-w>0);
el.style("cursor", "pointer")
el
.append("rect")
.attr("x", sx)
.attr("height", y.bandwidth())
.attr("width", w)
.attr("fill", d.color);
el
.append("text")
.text(d.civilization)
.attr("x",isLabelRight ? sx-5 : sx+w+5)
.attr("y", 2.5)
.attr("fill", "black")
.style("text-anchor", isLabelRight ? "end" : "start")
.style("dominant-baseline", "hanging");
}
dataByTimeline = d3.nest().key(d=>d.timeline).entries(data);
dataByRegion = d3.nest().key(d=>d.region).entries(data);
axisBottom = d3.axisBottom(x)
.tickPadding(2)
.tickFormat(formatDate)
axisTop = d3.axisTop(x)
.tickPadding(2)
.tickFormat(formatDate)
formatDate = d=> d < 0 ? `${-d}BC` : `${d}AD`
d3 = require("d3@5") // 使用的 D3 版本是 v5，比较旧
csv =d3.csvParse(await FileAttachment("civilization timelines - civilization timelines.csv").text())
data = csv.map(d=>{
return {
...d,
start: +d.start,
end: +d.end
}
}).sort((a,b)=> a.start-b.start);
regions = d3.nest().key(d=>d.region).entries(data).map(d=>d.key)
timelines = dataByTimeline.map(d=>d.key)
color = d3.scaleOrdinal(d3.schemeSet2).domain(regions)
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