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const colors = {
red: 'rgb(255, 99, 132)',
orange: 'rgb(255, 159, 64)',
yellow: 'rgb(255, 205, 86)',
green: 'rgb(75, 192, 192)',
blue: 'rgb(54, 162, 235)',
purple: 'rgb(153, 102, 255)',
grey: 'rgb(201, 203, 207)'
};
function randomExpense() {
// 10/1000 expenses are O(1,000)
// 100/2000 expenses are O(100)
// 1,000/2000 expenses are O(10)
// 10,000/2000 expenses are O(1)
const r = Math.random();
if (r <= 0.02) {
return Math.floor(Math.random() * 5000);
} else if (r <= 0.1) {
return Math.floor(Math.random() * 1000);
} else if (r <= 0.5) {
return Math.floor(Math.random() * 100);
} else {
return Math.floor(Math.random() * 10);
}
}
// Browser starts to choke around 10,000 data points.
function generateData() {
return Array(2000).fill(0).map(x => ({
// select a random day [0, 365]
x: Math.floor(Math.random() * 365),
// select a random USD amount in the range [1, 5,000]
y: randomExpense(),
// TODO(wpcarro): Attach transaction to `metadata` key.
metadata: { foo: 'bar' },
}));
}
////////////////////////////////////////////////////////////////////////////////
// Main
////////////////////////////////////////////////////////////////////////////////
const mount = document.getElementById('mount');
new Chart(mount, {
type: 'scatter',
data: {
datasets: [
{
label: 'Expenses',
data: generateData(),
backgroundColor: colors.red,
}
],
},
options: {
plugins: {
tooltip: {
callbacks: {
title: function(x) {
return `$${x[0].raw.y}`;
},
label: function(x) {
return JSON.stringify(x.raw.metadata);
},
},
},
},
},
})
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