Created
May 20, 2021 05:12
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import './App.css'; | |
import * as d3 from 'd3' | |
import {useEffect, useState} from 'react' | |
function App() { | |
useEffect(() => { | |
// Create a dataset of pets and the amount of people that own them | |
let dataSet = [ | |
{subject: "Dogs", count: 150}, | |
{subject: "Fish", count: 75}, | |
{subject: "Cats", count: 135}, | |
{subject: "Bunnies", count: 240}, | |
] | |
// Generate a p tag for each element in the dataSet with the text: Subject: Count | |
d3.select('#pgraphs').selectAll('p').data(dataSet).enter().append('p').text(dt => dt.subject + ": " + dt.count) | |
// Bar Chart: | |
const getMax = () => { // Calculate the maximum value in the DataSet | |
let max = 0 | |
dataSet.forEach((dt) => { | |
if(dt.count > max) {max = dt.count} | |
}) | |
return max | |
} | |
// Create each of the bars and then set them all to have the same height(Which is the max value) | |
d3.select('#BarChart').selectAll('div').data(dataSet) | |
.enter().append('div').classed('bar', true).style('height', `${getMax()}px`) | |
//Transition the bars into having a height based on their corresponding count value | |
d3.select('#BarChart').selectAll('.bar') | |
.transition().duration(1000).style('height', bar => `${bar.count}px`) | |
.style('width', '80px').style('margin-right', '10px').delay(300) // Fix their width and margin | |
}, []) | |
return ( | |
<div className = "App"> | |
<div id="pgraphs"></div> // Create a div to house our p tags | |
<div id="BarChart"></div> // Create a div to house our BarChart | |
</div> | |
); | |
} | |
export default App; |
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