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06.animator.html
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06.animator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport"
content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, target-densitydpi=device-dpi"/>
<style>
html, body {
overflow: hidden;
width: 100%;
height: 100%;
margin:0;
padding:0;
border: 0;
}
</style>
<script src="js/utils.js"></script>
<script src="js/Animator.js"></script>
<script>
var ctx;
var animator;
var lastUpdate = new Date();
function init() {
ctx = initFullScreenCanvas("mainCanvas").getContext("2d");
animator = new Animator(1000);
animator.setRepeatCount(Animator.INFINITE);
animator.setRepeatBehavior(Animator.RepeatBehavior.REVERSE);
animator.setAcceleration(0.8);
animator.setDeceleration(0.15);
animator.start();
animate(0);
}
function animate(t) {
var startX = 50;
var endX = 300;
var now = t || new Date().getTime();
var deltaTime = now - lastUpdate;
lastUpdate = now;
var fraction = animator.update(deltaTime);
var x = (1 - fraction)*startX + fraction*endX;
ctx.fillStyle = "white";
ctx.fillRect(0, 0, 500, 500);
drawBounds(startX, endX, ctx);
drawBullet(x, 50, ctx);
requestAnimationFrame(arguments.callee);
}
function drawBounds(startX, endX, ctx) {
ctx.strokeStyle = "lightblue";
ctx.lineWidth = 3;
ctx.beginPath();
ctx.moveTo(startX, 0);
ctx.lineTo(startX, 100);
ctx.moveTo(endX, 0);
ctx.lineTo(endX, 100);
ctx.closePath();
ctx.stroke();
}
function drawBullet(x, y, ctx) {
var grad = ctx.createRadialGradient(x + 5, y - 5, 4, x + 5, y - 5, 22);
grad.addColorStop(0, "yellow");
grad.addColorStop(1, "red");
ctx.fillStyle = grad;
ctx.lineWidth = 3;
ctx.beginPath();
ctx.arc(x, y, 20, 0, 2*Math.PI, false);
ctx.fill();
}
function initFullScreenCanvas(canvasId) {
var canvas = document.getElementById(canvasId);
resizeCanvas(canvas);
window.addEventListener("resize", function() {
resizeCanvas(canvas);
});
return canvas;
}
function resizeCanvas(canvas) {
canvas.width = document.width || document.body.clientWidth;
canvas.height = document.height || document.body.clientHeight;
}
</script>
</head>
<body onload="init()">
<canvas id="mainCanvas" width="500px" height="500px"></canvas>
</body>
</html>