Created
March 10, 2021 19:52
-
-
Save lvngd/1d9f56b2c4b8896563c6a6e5651ae795 to your computer and use it in GitHub Desktop.
Demo of D3 data joins - displaying random subsets from a grid of circles.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://d3js.org/d3.v6.min.js"></script> | |
</head> | |
<body> | |
<div id="chart"></div> | |
</body> | |
<script> | |
function getRandomInteger(min, max) { | |
return Math.floor(Math.random() * (max - min) + min); | |
} | |
function drawGraph(){ | |
d3.select("#chart") | |
.style("width", "400px") | |
.style("height", "400px"); | |
const enterColor = "#c6db5f",//apple green | |
updateColor = "#759e7e",//muted green | |
svgBackgroundColor = '#152c33' | |
width = 500, | |
height = 500, | |
numRows = 12, | |
numCols = 12, | |
radius = 16, | |
numNodes = numRows * numCols; | |
//x and y axis scales | |
const y = d3.scaleBand() | |
.range([0,400]) | |
.domain(d3.range(numRows)); | |
const x = d3.scaleBand() | |
.range([0, 400]) | |
.domain(d3.range(numCols)); | |
let circleNodes = d3.range(numNodes).map(function(i) { | |
return { | |
id: i, | |
radius: radius, | |
x: x(i%numCols), | |
y: y(Math.floor(i/numCols)) | |
}; | |
}); | |
const svg = d3.select('#chart') | |
.append('div') | |
.classed('svg-container', true) | |
.append('svg') | |
.attr("preserveAspectRatio", "xMinYMin meet") | |
.attr("viewBox", "0 0 500 500") | |
.classed('svg-content-responsive', true) | |
.style("background-color", svgBackgroundColor) | |
.append('g'); | |
//container to hold the grid | |
const container = svg.append("g") | |
.attr("transform", `translate(65,65)`); | |
function update(nodes){ | |
let t = d3.transition() | |
.duration(750); | |
let circles = container.selectAll("circle") | |
.data(nodes,d=>d.id); | |
circles | |
.join( | |
enter => enter.append("circle") | |
.attr("fill", enterColor), | |
update => update | |
.attr("fill", updateColor), | |
exit => exit | |
.style("opacity", 0.4) | |
.call(e => e.transition(t).remove()) | |
) | |
.attr('cx', d => d.x) | |
.attr('cy', d => d.y) | |
.attr('r', d => d.radius) | |
} | |
//initial layout | |
update(circleNodes); | |
d3.interval(function() { | |
update(d3.shuffle(circleNodes) | |
.slice(0, getRandomInteger(5,circleNodes.length))); | |
}, 2500); | |
} | |
//call function to draw the graph | |
drawGraph(); | |
</script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment