d3 mouse event, add circles on click - html

Question

I need to add in my code that when I click it, more circles and of different radius are added, I have been stuck up to this point
function dragstarted(event, d) {
d3.select(this).raise().attr("stroke", "black");
}
function dragged(event, d) {
d3.select(this).attr("cx", d.x = event.x).attr("cy", d.y = event.y);
}
function dragended(event, d) {
d3.select(this).attr("stroke", null);
}
const drag = d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
const height = 300,
width = 700
radius = 20
const svg = d3.select("svg")
.attr("viewBox", [0, 0, width, height])
.attr("stroke-width", 2);
const circles = d3.range(10).map(i => ({
x: Math.random() * (width - radius * 1) + radius,
y: Math.random() * (height - radius * 1) + radius,
}));
svg.selectAll("circle")
.data(circles)
.join("circle")
.attr("cx", d => d.x)
.attr("cy", d => d.y)
.attr("r", radius)
.attr("fill", (d, i) => d3.schemePastel1[i % 100])
.call(drag);
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/6.2.0/d3.min.js"></script>
<svg></svg>
I need to create something like that, that can move the circles and add more circles by clicking

Answer 1

Consider the following:
Move the drawing to a callable function
On click, push a new circle to the array of circles, using the clientX and clientY of the event and redraw.
function dragstarted(event, d) {
d3.select(this).raise().attr("stroke", "black");
}
function dragged(event, d) {
d3.select(this).attr("cx", d.x = event.x).attr("cy", d.y = event.y);
}
function dragended(event, d) {
d3.select(this).attr("stroke", null);
}
const drag = d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
const height = 300,
width = 700,
maxRadius = 20;
const circles = d3.range(10).map(i => ({
x: Math.random() * (width - maxRadius * 2) + maxRadius,
y: Math.random() * (height - maxRadius * 2) + maxRadius,
radius: Math.random() * (maxRadius - 2) + 2,
}));
const svg = d3.select("svg")
.attr("viewBox", [0, 0, width, height])
.attr("stroke-width", 2)
.on("click", (event) => {
console.log(event);
circles.push({
x: event.clientX,
y: event.clientY,
radius: Math.random() * (maxRadius - 2) + 2,
});
drawCircles();
})
function drawCircles() {
svg.selectAll("circle")
.data(circles)
.join("circle")
.attr("cx", d => d.x)
.attr("cy", d => d.y)
.attr("r", d => d.radius)
.attr("fill", (d, i) => d3.schemePastel1[i % 9])
.call(drag);
}
drawCircles();
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/6.2.0/d3.min.js"></script>
<svg></svg>