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Last active March 23, 2019 04:19
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Three.js Ball Bouncing off Walls - https://jsbin.com/rirahuw
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Three.js Ball Bouncing off Walls</title>
<style id="jsbin-css">
body { background-color:#ededed; font:normal 12px/18px Arial, Helvetica, sans-serif; }
h1 { display:block; width:600px; margin:20px auto; padding-bottom:20px; font:normal 24px/30px Georgia, "Times New Roman", Times, serif; color:#333; text-shadow: 1px 2px 3px #ccc; border-bottom:1px solid #cbcbcb; }
#container { width:600px; margin:0 auto; }
#myCanvas { background:#fff; border:1px solid #cbcbcb; }
</style>
</head>
<body>
<h1>Three.js Ball Bouncing off Walls</h1>
<div id="container">
<canvas id="myCanvas" width="300" height="300"></canvas>
</div>
<script id="jsbin-source-html" type="text/html">
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Three.js Ball Bouncing off Walls</title>
</head>
<body>
<h1>Three.js Ball Bouncing off Walls </h1>
<div id="container">
<canvas id="myCanvas" width="300" height="300"></canvas>
</div>
</body>
</html>
<script type="text/javascript">
var context;
var dx= 4;
var dy=4;
var y=150;
var x=10;
function draw(){
context= myCanvas.getContext('2d');
context.clearRect(0,0,300,300);
context.beginPath();
context.arc(x,y,20,0,Math.PI*2,true);
context.closePath();
context.fill();
if( x<0 || x>300){
context.fillStyle=getRandomColor();
dx=-dx;
}
if( y<0 || y>300)
{
context.fillStyle=getRandomColor();
dy=-dy;
}
x+=dx;
y+=dy;
}
setInterval(draw,10);
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
<\/script></script>
<script id="jsbin-source-css" type="text/css">body { background-color:#ededed; font:normal 12px/18px Arial, Helvetica, sans-serif; }
h1 { display:block; width:600px; margin:20px auto; padding-bottom:20px; font:normal 24px/30px Georgia, "Times New Roman", Times, serif; color:#333; text-shadow: 1px 2px 3px #ccc; border-bottom:1px solid #cbcbcb; }
#container { width:600px; margin:0 auto; }
#myCanvas { background:#fff; border:1px solid #cbcbcb; }</script>
</body>
</html>
<script type="text/javascript">
var context;
var dx= 4;
var dy=4;
var y=150;
var x=10;
function draw(){
context= myCanvas.getContext('2d');
context.clearRect(0,0,300,300);
context.beginPath();
context.arc(x,y,20,0,Math.PI*2,true);
context.closePath();
context.fill();
if( x<0 || x>300){
context.fillStyle=getRandomColor();
dx=-dx;
}
if( y<0 || y>300)
{
context.fillStyle=getRandomColor();
dy=-dy;
}
x+=dx;
y+=dy;
}
setInterval(draw,10);
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
</script>
Raw
jsbin.rirahuw.css
body { background-color:#ededed; font:normal 12px/18px Arial, Helvetica, sans-serif; }
h1 { display:block; width:600px; margin:20px auto; padding-bottom:20px; font:normal 24px/30px Georgia, "Times New Roman", Times, serif; color:#333; text-shadow: 1px 2px 3px #ccc; border-bottom:1px solid #cbcbcb; }
#container { width:600px; margin:0 auto; }
#myCanvas { background:#fff; border:1px solid #cbcbcb; }
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