chart = {
const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]);
svg.append("g").call(xAxis);
svg.append("g").call(yAxis);
svg
.append("g")
.attr("stroke", "none")
.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("cx", d => x(d.date))
.attr("cy", d => y(+d.value))
.attr("fill", d => z(+d.anomaly))
.attr("r", 5.5)
.on("mouseover", function(d) {
d3.select(this)
.attr("stroke", "orange")
.style("cursor", "pointer");
let x_range = x.range();
let middle = (x_range[1] - x_range[0]) / 2;
let x_offset = 15;
if (d.x > middle) x_offset = -180;
let tooltip = d3
.select("body")
.append("div")
.attr("class", "svg-tooltip")
.style("position", "absolute")
.style("visibility", "visible")
.html(
"Temperature: " +
d.target.__data__.value +
" ℉" +
"<br>" +
"Year: " +
formatTime(d.target.__data__.date)
)
.style("top", d.pageY - 10 + "px")
.style("left", d.pageX + x_offset + "px");
})
.on("mouseout", function(d) {
d3.selectAll(".svg-tooltip").remove();
d3.select(this).attr("stroke", "none");
});
svg
.append("path")
.datum(regression(data))
.style("fill", "none")
.style("stroke", "gray")
.style("stroke-width", "2px")
.attr("d", line);
return svg.node();
}
noaa_data_maine = FileAttachment("17-tavg-12-12-1895-2018.json").json()
regression = d3
.regressionLoess()
.x(d => d.date)
.y(d => +d.value)
.bandwidth(bandwidth)
line = d3.line()
.x(d => x(d[0]))
.y(d => y(d[1]));
x = d3.scaleTime()
.domain(d3.extent(data, d => d.date))
.range([margin.left, width - margin.right])
y = d3
.scaleLinear()
.domain(d3.extent(data, d => +d.value))
.nice()
.range([height - margin.bottom, margin.top])
z.domain()
z = {
const max = d3.max(data, d => Math.abs(d.anomaly));
return d3.scaleSequential(d3.interpolateRdBu).domain([max, -max]);
}
parseTime = d3.timeParse("%Y")
formatTime = d3.timeFormat("%Y")
xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).ticks(width / 80).tickSizeOuter(0))
yAxis = g =>
g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y).ticks(null, "+"))
.call(g => g.select(".domain").remove())
.call(g =>
g
.selectAll(".tick line")
.filter(d => d === 0)
.clone()
.attr("x2", width - margin.right - margin.left)
.attr("stroke", "#ccc")
)
.call(g =>
g
.append("text")
.attr("fill", "#000")
.attr("x", 5)
.attr("y", margin.top)
.attr("dy", "0.32em")
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text("Temperature (°F)")
)
styles = html`
<style>
.svg-tooltip {
background-color: white;
border-radius: .1rem;
border: 1px solid grey;
color: black;
display: block;
width: 200px
height: 200px;
padding: .2rem .4rem;
position: absolute;
text-overflow: ellipsis;
white-space: pre;
z-index: 300;
visibility: hidden;
}
</style>`
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