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bola8.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Bola 8</title>
<!-- With 💙 from @doguedogue -->
</head>
<style>
html,
body {
margin: 0;
height: 100%;
overflow: hidden
}
</style>
<body onresize="scrrsz()">
<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
scrrsz();
function scrrsz() {
WIDTH = window.innerWidth;
HEIGHT = window.innerHeight;
pantalla.width = WIDTH;
pantalla.height = HEIGHT;
x = 0; //start over
limpiarPantalla();
}
function disenharCircunferencia(x, y, radio) {
pincel.fillStyle = "black";
pincel.beginPath();
pincel.arc(x, y, radio, 0, 2 * Math.PI);
pincel.fill();
pincel.fillStyle = "white";
pincel.beginPath();
pincel.arc(x, y, radio / 2, 0, 2 * Math.PI);
pincel.fill();
pincel.font = `${RADIO}px Georgia`;
pincel.fillStyle = "black";
pincel.fillText("8", x - (radio / 3), y + (radio / 3));
}
function limpiarPantalla() {
pincel.clearRect(0, 0, WIDTH, HEIGHT);
pincel.fillStyle = COLOR;
pincel.fillRect(0, 0, WIDTH, HEIGHT);
}
var sentido = 1;
var RADIO = 100;
var x = 0 - RADIO;
var SPEED = 1;
var COLOR = "#048434";
function actualizarPantalla() {
limpiarPantalla();
disenharCircunferencia(x, HEIGHT / 2, RADIO);
if (sentido == 1) {
x++;
if (x > WIDTH - RADIO) {
sentido = 0;
}
} else {
x--;
if (x < 0 + RADIO) {
sentido = 1;
}
}
}
setInterval(actualizarPantalla, SPEED);
</script>
</body>
</html>