garciadelcastillo/index.html

## readme.md

      
    Raw
  

              readme.md
            
          
    Animation

Scripted changes can be added to the sketch by overriding its update function. This process would be analogous to Processing's draw() function:

  
## 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');

// Construct a circle with a rotating line inside
var center = new pad.Node(pad.width.value / 2, pad.height.value / 2),
    circle = pad.Circle.centerRadius(center, 100);
    tip = pad.Point.along(circle, 0.0),
    hand = pad.Line.between(center, tip);

// Override sketch's update function with a custom updater
pad.update = function () {
    // Make sure to use object's methods to modify values
    // or changes won't replicate to children elements
    tip.setParameter(pad.frameCount / 500);
    // tip.parameter = pad.frameCount / 500;  // this won't work
};

## 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');

	// Construct a circle with a rotating line inside
	var center = new pad.Node(pad.width.value / 2, pad.height.value / 2),
	circle = pad.Circle.centerRadius(center, 100);
	tip = pad.Point.along(circle, 0.0),
	hand = pad.Line.between(center, tip);

	// Override sketch's update function with a custom updater
	pad.update = function () {
	// Make sure to use object's methods to modify values
	// or changes won't replicate to children elements
	tip.setParameter(pad.frameCount / 500);
	// tip.parameter = pad.frameCount / 500; // this won't work
	};
	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;
	}