chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, calendar_width, calendar_height * years.length])
.attr("font-family", "sans-serif")
.attr("font-size", 10);
const year = svg.selectAll("g")
.data(years)
.join("g")
.attr("transform", (d, i) => `translate(40.5,${calendar_height * i + cellSize * 1.5})`);
year.append("text")
.attr("x", -5)
.attr("y", -5)
.attr("font-weight", "bold")
.attr("text-anchor", "end")
.text(([key]) => key);
year.append("g")
.attr("text-anchor", "end")
.selectAll("text")
.data((weekday === "weekday" ? d3.range(2, 7) : d3.range(7)).map(i => new Date(1995, 0, i)))
.join("text")
.attr("x", -5)
.attr("y", d => (countDay(d) + 0.5) * cellSize)
.attr("dy", "0.31em")
.text(formatDay);
year.append("g")
.selectAll("rect")
.data(weekday === "weekday"
? ([, values]) => values.filter(d => ![0, 6].includes(d.date.getUTCDay()))
: ([, values]) => values)
.join("rect")
.attr("width", cellSize - 1)
.attr("height", cellSize - 1)
.attr("x", d => timeWeek.count(d3.utcYear(d.date), d.date) * cellSize + 0.5)
.attr("y", d => countDay(d.date) * cellSize + 0.5)
.attr("fill", d => color(d.value))
.append("title")
.text(d => `${formatDate(d.date)}
Retail Percent Change:${formatValue(d.value)}${d.retail_and_recreation === undefined ? "" : `
Retail Change From Baseline: ${formatClose(d.retail_and_recreation)}`}`);
const month = year.append("g")
.selectAll("g")
.data(([, values]) => d3.utcMonths(d3.utcMonth(values[0].date), values[values.length - 1].date))
.join("g");
month.filter((d, i) => i).append("path")
.attr("fill", "none")
.attr("stroke", "#fff")
.attr("stroke-width", 3)
.attr("d", pathMonth);
month.append("text")
.attr("x", d => timeWeek.count(d3.utcYear(d), timeWeek.ceil(d)) * cellSize + 2)
.attr("y", -5)
.text(formatMonth);
return svg.node();
}