Published unlisted
Edited
Apr 5, 2021
chart = {
const el = DOM.svg(width + margin.left + margin.right, height + margin.top + margin.bottom)
const svg = d3.select(el)
const clip = DOM.uid("clip");
svg.append("defs")
.append("clipPath")
.attr("id", clip.id)
.append("rect")
.attr("width", width)
.attr("height", height);
const focus = svg.append("g")
.attr("class", "focus")
.attr("transform", `translate(${margin.left},${margin.top})`);
const context = svg.append("g")
.attr("class", "context")
.attr("transform", `translate(${margin2.left},${margin2.top})`);
focus.append("path")
.datum(data)
.attr("clip-path", clip)
.attr("class", "area")
.attr("d", area)
.style("fill", "black");
focus.append("g")
.attr("class", "x axis")
.attr("transform", `translate(0,${height})`)
.call(xAxis);
focus.append("g")
.attr("class", "y axis")
.call(yAxis);
context.append("path")
.datum(data)
.attr("class", "area")
.attr("d", area2);
context.append("g")
.attr("class", "x axis")
.attr("transform", `translate(0,${height2})`)
.call(xAxis2);
context.append("g")
.attr("class", "x brush")
//add tooltip
const tooltip = focus.append("g");
focus.on("touchmove mousemove", function(event) {
const {date, value} = bisect(d3.pointer(event, this)[0]);
tooltip
.attr("transform", `translate(${x(parseDate(date))},${y(value)})`)
.call(callout, `${(value)}
${parseDate(date)}`);
});
focus.on("touchend mouseleave", () => tooltip.call(callout, null));
return el;
}
brush = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height])
.style("display", "block");
const brush = d3.brushX(x2)
.extent([[0, -10],[width - margin.right, height2]])
.on('brush', brushed)
.on("end", brushended)
d3.select(chart)
.select('g.brush')
.call(brush)
const defaultSelection = [x(d3.utcHour.offset(x.domain()[0], -1)), x.range()[1]];
svg.append("g")
.call(xAxis, x, height);
svg.append("path")
.datum(data)
.attr("fill", "yellow")
.attr("d", area);
const gb = svg.append("g")
.call(brush)
.call(brush.move, defaultSelection);
function brushed() {
let extent = d3.event.selection.map(d => x2.invert(d))
x.domain( extent )
d3.select(chart).select(".area").attr("d", area);
d3.select(chart).select(".x.axis").call(xAxis);
}
function brushended() {
if (!d3.event.selection) {
gb.call(brush.move, defaultSelection);
}
}
return svg.brush
}
area2 = d3.area()
.x(d => x2(parseDate(d.date)))
.y0(y2(0))
.y1(d => y2(d.count))
.curve(d3.curveStepAfter)
area = d3.area()
.x(d => x(parseDate(d.date)))
.y0(y(0))
.y1(d => y(d.count))
.curve(d3.curveStepAfter)
yAxis = d3.axisLeft(y)
xAxis2 = d3.axisBottom(x2)
xAxis = d3.axisBottom(x)
width = 960 - margin.left - margin.right
margin2 = ({ top: 430, right: 10, bottom: 20, left: 40 })
margin = ({top: 10, right: 10, bottom: 100, left: 40})
height = 500 - margin.top - margin.bottom
height2 = 500 - margin2.top - margin2.bottom
y = d3.scaleLinear()
.domain([0, d3.max(data.map(d => d.count))])
.range([height, 0])
y2 = d3.scaleLinear()
.domain([0, d3.max(data.map(d => d.count))])
.range([height2,0])
x = {
const minDate = d3.min(data.map(d => parseDate(d.date)))
const maxDate = d3.max(data.map(d => parseDate(d.date)))
return d3.scaleTime()
.domain([minDate, maxDate])
.range([0, width])
}
x2 = {
const minDate = d3.min(data.map(d => parseDate(d.date)))
const maxDate = d3.max(data.map(d => parseDate(d.date)))
return d3.scaleTime()
.domain(x.domain())
.range([0, width])
}
timeParse = d3.timeParse("%Y-%m-%d %H:%M:%S")
parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S")
formatDate = d3.timeFormat("%Y-%m-%d %H:%M:%S")
data = {
const earliestStartDate = d3.min(candidates.map(d => parseDate(d.start)))
const lastDate = d3.max(candidates.map(d => parseDate(d.end)))
let dates = d3.scaleTime()
.domain([d3.timeHour.offset(earliestStartDate, -1), lastDate])
.ticks(d3.timeHour.every(1))
.map(d => formatDate(d))
const datesAndCounts = dates.map(d => {
let c = 0
for (let i = 0; i < candidates.length; i++) {
const cStart = candidates[i].start
const cEnd = candidates[i].end
if ((parseDate(cStart) <= parseDate(d)) && (parseDate(cEnd) > parseDate(d) || cEnd === "")) {
c++
}
}
return {date: d, count: c}
})
return datesAndCounts
}
candidates = [
{name: "nome1", start: "2019-09-01 09:00:12", end: "2019-09-02 15:20:13"},
{name: "nome2", start: "2019-09-01 05:10:33", end: "2019-09-01 12:40:15"},
{name: "nome3", start: "2019-09-01 02:08:11", end: "2019-09-01 13:15:23"}
]
d3 = require("d3@5")
callout = (g, value) => {
if (!value) return g.style("display", "none");
g
.style("display", null)
.style("pointer-events", "none")
.style("font", "10px sans-serif");
const path = g.selectAll("path")
.data([null])
.join("path")
.attr("fill", "white")
.attr("stroke", "black");
const text = g.selectAll("text")
.data([null])
.join("text")
.call(text => text
.selectAll("tspan")
.data((value + "").split(/\n/))
.join("tspan")
.attr("x", 0)
.attr("y", (d, i) => `${i * 1.1}em`)
.style("font-weight", (_, i) => i ? null : "bold")
.text(d => d));
const {x, y, width: w, height: h} = text.node().getBBox();
text.attr("transform", `translate(${-w / 2},${15 - y})`);
path.attr("d", `M${-w / 2 - 10},5H-5l5,-5l5,5H${w / 2 + 10}v${h + 20}h-${w + 20}z`);
}
bisect = {
const bisect = d3.bisector(d => parseDate(d.date)).left;
return mx => {
const date = x.invert(mx);
const index = bisect(data, date, 1);
const a = data[index - 1];
const b = data[index];
return b && (date - a.date > b.date - date) ? b : a;
};
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
