JSFiddle - React, Tailwind, and code Playground

by booktu8

HTML

<canvas id="canvas"></canvas>

JavaScript

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.arc(70, 80, 10, 0, 2 * Math.PI, false);
ctx.fill();
ctx.addHitRegion({id: "circle"});

canvas.addEventListener("mousemove", function(event){
  if(event.region) {
    alert("hit region: " + event.region);
  }
});