Building and Using Tools to See.
UVA Architecture + Data Science. IT Director. Instructor.
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Heatmap
import {world_gdp_growth} from "@emfielduva/dvlib_sampledata"
world_gdp_growth
Inputs.table(world_gdp_growth)
tallGDPdata = {
const tallGDPdata = [];
world_gdp_growth.forEach(d => {
for (let i=1960; i<=2012; i++) {
tallGDPdata.push({"Country Name": d["Country Name"], year: i, value: d[i]});
}
})
return tallGDPdata;
}
Inputs.table(tallGDPdata)
heatmap1 = Plot.plot({
width: 400,
//x: {axis: null},
marks: [
Plot.cell(tallGDPdata, {
x: "year",
y: "Country Name",
fill: "value"
})
]
})
heatmap1
<svg width="1000" height="1500">
<g id="heatmap"></g>
<text x="500" y="30" style="font-size: 14px; font-weight: bold;">Float over and click on cells.</text>
<text id="explain" x="500" y="100" style="font-size: 20px; font-weight: bold;"></text>
</svg>
<div id="controls">
<button id="show">Show All</button>
</div>
<style>
#controls {position: absolute; top:40px; left: 495px;}
button {background-color: #fefefe; border: 1px solid #eee; border-radius: 3px; cursor: pointer;}
</style>
hmElem = d3.select(svgContainer).select("#heatmap")
heatmap2 = dvHeatmap(hmElem,tallGDPdata,"year","Country Name","value",options)
options = ({
boxSize: 5,
paddingX: 1,
colorScale: colorScale, // next cell below
startPos: {x:100,y:20}, // shifts it to accomodate the side and top labels
rotateColumnTextDeg: -60 // negative directions go counter-clockwise. Azimuth not Cartesian.
})
colorScale = d3.scaleLinear().domain([-50,0,50]).range(["red","white","green"])
explain = (evt,d) => {
let thisElem = evt.currentTarget;
let elemD3 = d3.select(thisElem);
d3.select("#explain").text(d["Country Name"] + ": " + d.year) ;
}
highlightYear = (evt,d) => {
let thisElem = evt.currentTarget;
let selectedYear = d.year;
dimAll();
heatmap2.filter(d => d.year == selectedYear).style("opacity","");
}
dimAll = () => {
heatmap2.style("opacity",0.1)
}
showAll = () => {
heatmap2.style("opacity","")
}
heatmap2.on("mouseover", explain)
heatmap2.on("click", highlightYear)
{
// register event listeners
const btns = d3.select(svgContainer).select("#controls");
btns.select("#show").on("click", showAll);
}
highlight = {
heatmap2.filter(d => toNum(d.value) < range.low || toNum(d.value) > range.high).style("stroke","");
heatmap2.filter(d => toNum(d.value) >= range.low && toNum(d.value) <= range.high).style("stroke","steelblue");
}
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