garciadelcastillo/index.html

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
    <link rel="stylesheet" type="text/css" href="styles.css">
  </head>
  <body>
    <div id="sketchpadDiv">
      <canvas id="sketchpadCanvas"></canvas>
    </div>
  </body>
  <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
  <script type="text/javascript" src="http://www.garciadelcastillo.es/sketchpad/sketchpad.js"></script>
  <script type="text/javascript" src="sketch.js"></script>
</html>

## sketch.js
// Create new instance of Sketchpad in target Canvas
var pad = new Sketchpad('sketchpadCanvas');

// Create some Nodes and join them with Lines
var A = new pad.Node(100, 100),
    B = new pad.Node(540, 300),
    C = new pad.Node(540, 100),
    D = new pad.Node(100, 300),
    AB = pad.Line.between(A, B),
    CD = pad.Line.between(C, D);

// Compute the intersection of the Lines, and attach a Circle to it
var X = pad.Point.intersection(AB, CD),
	circleX = pad.Circle.centerRadius(X, 101);

// Compute intersections between Circle and Lines
var XAB = pad.Point.intersection(AB, circleX),
	XCD = pad.Point.intersection(CD, circleX);

// Display and Tag all Points
pad.showPoints();
pad.tagPoints();

## styles.css
body {
  margin: 0;
  padding: 0;
}

#sketchpadDiv {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px solid #000;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

#sketchpadCanvas {
  position: absolute;
}
	<!DOCTYPE html>
	<meta charset="utf-8">
	<html>
	<head>
	<link rel="stylesheet" type="text/css" href="styles.css">
	</head>
	<body>
	<div id="sketchpadDiv">
	<canvas id="sketchpadCanvas"></canvas>
	</div>
	</body>
	<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
	<script type="text/javascript" src="http://www.garciadelcastillo.es/sketchpad/sketchpad.js"></script>
	<script type="text/javascript" src="sketch.js"></script>
	</html>
	// Create new instance of Sketchpad in target Canvas
	var pad = new Sketchpad('sketchpadCanvas');

	// Create some Nodes and join them with Lines
	var A = new pad.Node(100, 100),
	B = new pad.Node(540, 300),
	C = new pad.Node(540, 100),
	D = new pad.Node(100, 300),
	AB = pad.Line.between(A, B),
	CD = pad.Line.between(C, D);

	// Compute the intersection of the Lines, and attach a Circle to it
	var X = pad.Point.intersection(AB, CD),
	circleX = pad.Circle.centerRadius(X, 101);

	// Compute intersections between Circle and Lines
	var XAB = pad.Point.intersection(AB, circleX),
	XCD = pad.Point.intersection(CD, circleX);

	// Display and Tag all Points
	pad.showPoints();
	pad.tagPoints();
	body {
	margin: 0;
	padding: 0;
	}

	#sketchpadDiv {
	position: absolute;
	width: 100%;
	height: 100%;
	border: 1px solid #000;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	}

	#sketchpadCanvas {
	position: absolute;
	}