--canvas---------/earch.html at master · fanaiai/--canvas--------- · GitHub

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" type="text/css" href="css/reset.css">
    <style type="text/css">
    body {
        text-align: center;
    }

    canvas {
        margin: 0 auto;
        border: 1px solid #ccc;
    }
    </style>
</head>

<body>
    <canvas id="canvas"></canvas>
</body>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
canvas.width = 600;
canvas.height = 600;

window.onload = function() {}

var sun = new Image();
var moon = new Image();
var earth = new Image();

function init() {
    sun.src = 'https://mdn.mozillademos.org/files/1456/Canvas_sun.png';
    moon.src = 'https://mdn.mozillademos.org/files/1443/Canvas_moon.png';
    earth.src = 'https://mdn.mozillademos.org/files/1429/Canvas_earth.png';
    window.requestAnimationFrame(draw);
}

function draw() {
    var ctx = document.getElementById('canvas').getContext('2d');

    ctx.globalCompositeOperation = 'destination-over';
    ctx.clearRect(0, 0, canvas.width, canvas.height); // clear canvas

    ctx.fillStyle = 'rgba(0,0,0,0.4)';
    ctx.strokeStyle = 'rgba(0,153,255,0.4)';
    ctx.save();
    ctx.translate(canvas.width/2, canvas.height/2);

    // Earth
    var time = new Date();
    ctx.rotate(((2 * Math.PI) / 60) * time.getSeconds() + ((2 * Math.PI) / 60000) * time.getMilliseconds());
    ctx.translate(105, 0);
    ctx.fillRect(0, -12, 50, 24); // Shadow
    ctx.drawImage(earth, -12, -12);

    // Moon
    ctx.save();
    ctx.rotate(((2 * Math.PI) / 6) * time.getSeconds() + ((2 * Math.PI) / 6000) * time.getMilliseconds());
    ctx.translate(0, 28.5);
    ctx.drawImage(moon, -3.5, -3.5);
    ctx.restore();

    ctx.restore();

    ctx.beginPath();
    ctx.arc(canvas.width/2, canvas.height/2, 105, 0, Math.PI * 2, false); // Earth orbit
    ctx.stroke();

    ctx.drawImage(sun, 0, 0, canvas.width, canvas.height);

    window.requestAnimationFrame(draw);
}

init();
</script>

</html>