<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="utf-8">
<title>Animacja w Canvas</title>
<script type="text/javascript">
var canvas
var context;
var x = 20;
var y = 200;
var z = 200;
var a = 20;
var dx = 10; /// o ile ma sie przesuwać
var kolory = new Array("blue", "red", "yellow", "green"); /// zmina kolorow
var i = 0;
// rysownie koła onLoad body
function draw() {
canvas = document.getElementById('image1');
context = canvas.getContext('2d');
setInterval(anim, 20); // co ile wywyołuje funkcje animacja im mniejsza wartośc tym szybciej
}
function anim() {
context.clearRect(0, 0, canvas.width, canvas.height);
x += dx;
if (x > (canvas.width - 20)) {
dx = -10;
i = ++i % kolory.length;
}
if (x < 20) {
dx = 10;
i = ++i % kolory.length;
}
// rysowanie koła
context.beginPath();
context.fillStyle = kolory[i];
context.arc(x, y, 20, 0, Math.PI * 2, true);
context.closePath;
context.fill();
/// koniec rysowania koła
}
</script>
<style type="text/css">
canvas { border: 1px solid blue; }
</style>
</head>
<body onload="draw();">
<canvas id="image1" width="400" height="400">
Twoja przeglądarka nie wspiera elementu canvas!
Pobierz Internet Explorer 9 lub nowszą wersję!
</canvas>
</body>
</html>
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