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bower_components/observe-js/examples/constrain.html

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+<!--
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<h1>The world's simplest constraint-solver</h1>
+<script src="constrain.js"></script>
+<script>
+function Circle(radius) {
+  // circumference = 2*PI*radius
+  constrain(this, {
+    radius: function() { return this.circumference / (2*Math.PI); },
+    circumference: function() { return 2 * Math.PI * this.radius; }
+  });
+
+  // area = PI*r^2'
+  constrain(this, {
+    area: function() { return Math.PI * Math.pow(this.radius, 2); },
+    radius: function() { return Math.sqrt(this.area / Math.PI); }
+  });
+
+  if (radius)
+    this.radius = radius;
+}
+</script>