I want to constrain a controller within an area of a circle with jquery-ui's draggable widget. I write some codes like this:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.3/jquery-ui.js"></script>
<style>
.draggable {
width: 80px;
height: 80px;
border: thin solid #000000;
border-radius: 40px;
position: relative;
top: 110px;
left: 110px;
background-color: #000000;
}
.containment-wrapper {
height: 300px;
width: 300px;
border: thin solid #000000;
border-radius: 150px;
}
</style>
</head>
<body>
<div class="containment-wrapper">
<div id="draggable" class="draggable"></div>
</div>
</body>
<script>
$( "#draggable" ).draggable({ containment: "parent" });
</script>
</html>
The path which the black circle can go along is actually a rectangle, even the appearance of the wrapper div is a circle.
How to correct this to fit my purpose?
