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1_position.html
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<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>Skookum Labs - http://labs.skookum.com/demos/barcampclt_physics/</title></head>
<body>
<canvas id="surface" width="600" height="400"></canvas>
<pre><code id="source">
// Version 0: Position
var ball = {
x: 300,
y: 200,
r: 15
};
var canvas = document.getElementById("surface");
var ctx = canvas.getContext('2d');
setInterval(function() {
// Clear display
ctx.save();
ctx.fillStyle = "rgba(0, 1, 1, .2)";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.restore();
// Draw ball
ctx.save();
ctx.translate(ball.x, ball.y);
ctx.fillStyle = "#f00";
ctx.beginPath();
ctx.arc(0, 0, ball.r, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
ctx.restore();
}, 1000 / 77);
</code></pre>
<script>
// Version 0: Position
var ball = {
x: 300,
y: 200,
r: 15
};
var canvas = document.getElementById("surface");
var ctx = canvas.getContext('2d');
setInterval(function() {
// Clear display
ctx.save();
ctx.fillStyle = "rgba(0, 255, 255, 1)";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.restore();
// Draw ball
ctx.save();
ctx.translate(ball.x, ball.y);
ctx.fillStyle = "#F00";
ctx.beginPath();
ctx.arc(0, 0, ball.r, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
ctx.restore();
}, 1000 / 77);
</script>
</body></html>