COVID-19 Early Spread in South Carolina
· 7 min read
COVID-19 Early Spread in South Carolina
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Sources
- SCDHEC News Releases, Information & Videos (COVID-19) Accessed 27 Mar. 2020.
Source Code
View source
CovidSpreadDemo.tsx
import { useBaseUrlUtils } from "@docusaurus/useBaseUrl";
import { useEffect, useId } from "react";
import * as d3 from "d3";
import styles from "./styles.module.css";
import * as topojson from "topojson-client";
export default function LightSpeed() {
let { withBaseUrl } = useBaseUrlUtils();
let id = useId();
useEffect(() => {
const width = 420,
height = 360,
maxRadius = 28;
let maxData = 100;
let wrapper = document.getElementById(id);
let svg = d3
.select(wrapper)
.append("svg")
.attr("width", width)
.attr("id", "SVGMain")
.attr("height", height);
let sc_projection = d3
.geoAlbers()
.parallels([32 + 30 / 60, 34 + 50 / 60])
.rotate([81, 0])
.scale(6000)
.translate([155, -340]);
let path = d3.geoPath().projection(sc_projection);
let tooltip = d3
.select(wrapper)
.append("div")
.attr("class", styles.tooltip)
.style("opacity", 0);
let radius;
let playButton;
let stopButton;
let sizeLegend;
let colorLegend;
let timeLegend;
let virusData;
let deathData;
let centroids = {};
let totalData = {};
let dateOptions = {
month: "long",
day: "numeric",
} satisfies Intl.DateTimeFormatOptions;
let dataLoaded = false;
let currentDay = 0;
let timerID: NodeJS.Timeout | null = null;
let isPlaying = false;
function getDate(day) {
return new Date(2020, 2, 6 + day);
}
function drawButtons() {
let buttonGroup = svg
.append("g")
.attr(
"transform",
"translate(" +
(width - 50) +
"," +
(height - 20 - (2 * maxRadius + 10)) +
")"
)
.attr("class", styles.button);
playButton = buttonGroup
.append("g")
.attr("class", styles.button)
.attr("transform", "translate(0," + (maxRadius - 20) + ")")
.on("click", playAnimation);
playButton
.append("rect")
.attr("rx", 10)
.attr("ry", 10)
.attr("width", maxRadius * 2)
.attr("height", maxRadius)
.attr("x", -maxRadius);
playButton
.append("text")
.attr("x", -maxRadius / 2)
.attr("dy", "1.2em")
.text("Play");
stopButton = buttonGroup
.append("g")
.attr("class", styles.button)
.attr("transform", "translate(0," + (maxRadius * 2 - 10) + ")")
.on("click", stopAnimation);
stopButton
.append("rect")
.attr("rx", 10)
.attr("ry", 10)
.attr("width", maxRadius * 2)
.attr("height", maxRadius)
.attr("x", -maxRadius);
stopButton
.append("text")
.attr("x", -maxRadius / 2 - 2)
.attr("dy", "1.2em")
.text("Stop");
}
function drawLegend() {
let d1 = maxData / 2;
let d2 = maxData / 4;
sizeLegend = svg
.append("g")
.attr("class", styles.sizeLegend)
.attr(
"transform",
"translate(" + 60 + "," + (height - 20) + ")"
)
.selectAll("g")
.data([
Math.floor(d1 / 10) * 10,
Math.floor(d2 / 10) * 10,
Math.floor(maxData / 10) * 10,
])
.enter()
.append("g");
sizeLegend
.append("circle")
.attr("cy", function (d) {
return -radius(d);
})
.attr("r", radius);
sizeLegend
.append("text")
.attr("y", function (d) {
return -2 * radius(d);
})
.attr("x", function (d) {
return -radius(d) / 100;
})
.attr("dy", "1.2em")
.text(d3.format(".1s"));
colorLegend = svg
.append("g")
.attr("class", styles.colorLegend)
.attr(
"transform",
"translate(" +
60 +
"," +
(height - (20 + 2 * maxRadius)) +
")"
)
.selectAll("g")
.data([
[0, "Cases", "#aa1111"],
[1, "Deaths", "#000"],
])
.enter()
.append("g");
colorLegend
.append("circle")
.attr("cx", function (d) {
return d[0] * 60 - 30;
})
.attr("cy", -maxRadius)
.attr("r", maxRadius)
.style("fill", function (d) {
return d[2];
});
colorLegend
.append("text")
.attr("x", function (d) {
return d[0] * 60 - 30;
})
.attr("y", -maxRadius - 10)
.attr("dy", "1.2em")
.text(function (d) {
return d[1];
});
timeLegend = svg
.append("g")
.attr("class", styles.timeLegend)
.attr(
"transform",
"translate(" +
60 +
"," +
(height - (20 + 32 + 4 * maxRadius)) +
")"
)
.data([0]);
timeLegend
.append("rect")
.attr("width", maxRadius * 2 + 4)
.attr("rx", 10)
.attr("ry", 10)
.attr("height", maxRadius)
.attr("x", -maxRadius - 2);
timeLegend
.append("text")
.attr("y", maxRadius / 2 + 3)
.text(function (d) {
return getDate(d).toLocaleDateString("en-US", dateOptions);
});
}
function load_initial_data() {
maxData = 0;
for (let day in virusData.columns) {
let dayData = {};
for (let county in virusData[day]) {
dayData[county] = [
virusData[day][county],
deathData[day][county],
];
maxData = Math.max(maxData, virusData[day][county]);
}
totalData[day] = dayData;
}
radius = d3.scaleSqrt().domain([0, maxData]).range([0, maxRadius]);
drawLegend();
drawButtons();
fill_initial_data();
}
function inputInitialData() {
d3.csv(
withBaseUrl("covid-spread-sc/SC_VIRUS_TOTAL_CUMULATIVE.csv")
).then(function (total_data) {
virusData = total_data;
if (dataLoaded) {
load_initial_data();
} else {
dataLoaded = true;
}
});
d3.csv(
withBaseUrl("covid-spread-sc/SC_VIRUS_DEATH_CUMULATIVE.csv")
).then(function (total_data) {
deathData = total_data;
if (dataLoaded) {
load_initial_data();
} else {
dataLoaded = true;
}
});
}
function fill_initial_data() {
let dVList = Object.entries(totalData[0]).map(([key, value]) => {
return { key, value };
});
svg.selectAll(`path.${styles.countyFill}`)
.data(dVList)
.style("fill-opacity", function (d: any) {
if (+d.value[0] > 0) return 0;
return 1;
})
.on("mouseover", function (evt: MouseEvent, d: any) {
if (+d.value[0] >= 1) return;
let firstS = "";
let secondS = "";
if (d.value[0] != 1) firstS = "s";
if (d.value[1] != 1) secondS = "s";
let tooltipText =
"<bold>" +
d.key +
"</bold>" +
"<br/>" +
+d.value[0] +
" case" +
firstS +
"<br/>" +
+d.value[1] +
" death" +
secondS;
tooltip.transition().duration(200).style("opacity", 0.9);
tooltip
.html(tooltipText)
.style("left", evt.pageX + "px")
.style("top", evt.pageY - 28 + "px");
})
.on("mouseout", function (d) {
tooltip.transition().duration(500).style("opacity", 0);
});
let countyLocations = svg
.append("g")
.attr("class", styles.bubbleContainer)
.selectAll(".county-centroid")
.data(dVList)
.enter()
.append("g")
.attr("class", "county-centroid")
.attr("transform", function (d: any) {
return "translate(" + centroids[d.key] + ")";
});
let cases = countyLocations
.append("circle")
.attr("class", styles.case)
.attr("r", function (d: any) {
return radius(+d.value[0]);
});
countyLocations
.append("circle")
.attr("class", styles.death)
.attr("r", function (d: any) {
return radius(+d.value[1]);
});
countyLocations
.append("circle")
.attr("class", styles.caseBoundary)
.attr("r", function (d: any) {
return radius(+d.value[0]);
})
.on("mouseover", function (evt: MouseEvent, d: any) {
let firstS = "";
let secondS = "";
if (d.value[0] != 1) firstS = "s";
if (d.value[1] != 1) secondS = "s";
let tooltipText =
"<bold>" +
d.key +
"</bold>" +
"<br/>" +
+d.value[0] +
" case" +
firstS +
"<br/>" +
+d.value[1] +
" death" +
secondS;
tooltip.transition().duration(200).style("opacity", 0.9);
tooltip
.html(tooltipText)
.style("left", evt.pageX + "px")
.style("top", evt.pageY - 28 + "px");
})
.on("mouseout", function (d) {
tooltip.transition().duration(500).style("opacity", 0);
});
}
function playAnimation() {
if (isPlaying) return;
isPlaying = true;
if (currentDay >= Object.keys(virusData).length - 2) {
currentDay = 0;
transitionToDay(currentDay);
}
timerID = setInterval(() => updateForNextDay(), 605);
}
function stopAnimation() {
if (!isPlaying) return;
if (timerID != null) {
clearInterval(timerID);
}
isPlaying = false;
}
function updateForNextDay() {
currentDay = (currentDay + 1) % (Object.keys(totalData).length - 2);
transitionToDay(currentDay);
}
function transitionToDay(day) {
if (day >= Object.keys(virusData).length - 2) {
stopAnimation();
}
let dVList = Object.entries(totalData[day]).map(([key, value]) => {
return { key, value };
});
let countyLocations = svg
.selectAll(".county-centroid")
.data(dVList);
let cases = countyLocations.select(`circle.${styles.case}`);
let deaths = countyLocations.select(`circle.${styles.death}`);
let boundaries = countyLocations.select(
`circle.${styles.caseBoundary}`
);
svg.select(`.${styles.timeLegend}`)
.data([day])
.select("text")
.text(function (d) {
return getDate(d).toLocaleDateString("en-US", dateOptions);
});
if (day == 0) {
cases.attr("r", function (d: any) {
return radius(+d.value[0]);
});
deaths.attr("r", function (d: any) {
return radius(+d.value[1]);
});
boundaries.attr("r", function (d: any) {
return radius(+d.value[0]);
});
svg.selectAll(`path.${styles.countyFill}`)
.data(dVList)
.style("fill-opacity", function (d: any) {
if (+d.value[0] >= 1) return 0;
return 1;
});
} else {
let transitionEase = d3.easeLinear;
let duration = 600;
cases
.transition()
.duration(duration)
.ease(transitionEase)
.attr("r", function (d: any) {
return radius(+d.value[0]);
});
deaths
.transition()
.duration(duration)
.ease(transitionEase)
.attr("r", function (d: any) {
return radius(+d.value[1]);
});
boundaries
.transition()
.duration(duration)
.ease(transitionEase)
.attr("r", function (d: any) {
return radius(+d.value[0]);
});
svg.selectAll(`path.${styles.countyFill}`)
.data(dVList)
.transition()
.ease(transitionEase)
.duration(duration)
.style("fill-opacity", function (d: any) {
if (+d.value[0] >= 1) return 0;
return 1;
});
}
}
d3.json(withBaseUrl("covid-spread-sc/states.json")).then(function (
sc: any
) {
let state = topojson.feature(sc, sc.objects.places);
svg.append("path")
.datum(state)
.attr("d", path)
.attr("class", styles.state);
});
d3.json(withBaseUrl("covid-spread-sc/counties.json")).then(function (
counties: any
) {
let features = topojson.feature(
counties,
counties.objects.places
).features;
svg.append("g")
.selectAll(`path.${styles.countyFill}`)
.data(
features.sort(function (a, b) {
if (b.properties.NAME > a.properties.NAME) return -1;
if (b.properties.NAME < a.properties.NAME) return 1;
return 0;
})
)
.enter()
.append("path")
.attr("d", path)
.attr("class", styles.countyFill);
svg.append("path")
.datum(
topojson.mesh(
counties,
counties.objects.places,
function (a, b) {
return a !== b;
}
)
)
.attr("d", path)
.attr("class", styles.countyBoundary);
svg.append("path")
.datum(
topojson.mesh(
counties,
counties.objects.places,
function (a, b) {
return a === b;
}
)
)
.attr("d", path)
.attr("class", styles.countyBoundary);
for (let i = 0; i < features.length; i++) {
let centroid = path.centroid(features[i]);
if (features[i].properties.NAME == "Charleston") {
centroid = [centroid[0] - 15, centroid[1] + 12];
}
centroids[features[i].properties.NAME] = centroid;
}
inputInitialData();
});
}, [id]);
return <div className={styles.wrapper} id={id} />;
}