<html>
<head>
<style>
canvas {
border: 10px solid rgb(250, 0, 0);
margin: 0 auto;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="1000" height="720"></canvas>
<script type="text/javascript">
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 50;
var x = 50;
var y = 50;
var x2 = 350;
var y2 = 550;
var dx = 5;
var dy = -5;
var dx2 = 5;
var dy2 = -5;
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI * 2);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
function drawBall2() {
ctx.beginPath();
ctx.arc(x2, y2, ballRadius, 0, Math.PI * 2);
ctx.fillStyle = "red";
ctx.fill();
ctx.closePath();
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBall();
drawBall2();
if (x + dx > canvas.width - ballRadius || x + dx < ballRadius) {
dx = -dx;
}
if (y + dy > canvas.height - ballRadius || y + dy < ballRadius) {
dy = -dy;
}
if (x2 + dx > canvas.width - ballRadius || x2 + dx2 < ballRadius) {
dx2 = -dx2;
}
if (y2 + dy > canvas.height - ballRadius || y2 + dy2 < ballRadius) {
dy2 = -dy2;
}
x += dx;
y += dy;
x2 += dx2;
y2 += dy2;
}
setInterval(draw, 10);
</script>
</body>
</html>