JSFiddle - React, Tailwind, and code Playground

by Adolfo

HTML

<canvas id="myCanvas" width="480" height="320"></canvas>

CSS

canvas { background: #eee; }

JavaScript

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-ballRadius;
var dx = 2;
var dy = -2;
var c = false; //cambia color
var r; //rojo
var g; //verde
var b; //azul

function drawBall() {
    r = Math.floor(Math.random() * 256);
    g = Math.floor(Math.random() * 256);
    b = Math.floor(Math.random() * 256);
    ctx.beginPath();
    ctx.arc(x, y, ballRadius, 0, Math.PI*2);
    if (c){
    	ctx.fillStyle = 'rgb(' + r + ',' + g + ',' + b + ')';
      c=false;
    }
    ctx.fill();
    ctx.closePath();
}

function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    drawBall();
    
    if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
        dx = -dx;
				c = true;
    }
    if(y + dy > canvas.height-ballRadius || y + dy < ballRadius) {
        dy = -dy;
        c = true;
    }
    x += dx;
    y += dy;
}

setInterval(draw, 5);