implement pinch to zoom

node_modules/component-tween/Readme.md

@@ -0,0 +1,78 @@
+
+# tween
+
+  Motion tween component using [ease](https://github.com/component/ease).
+
+## Installation
+
+    $ component install component/tween
+
+## Example
+
+```js
+var Tween = require('tween');
+var raf = require('raf');
+var button = document.querySelector('button');
+
+var tween = Tween({ rotate: 0, opacity: 0 })
+  .ease('out-bounce')
+  .to({ rotate: 360, opacity: 1  })
+  .duration(800);
+
+tween.update(function(o){
+  button.style.opacity = o.opacity;
+  button.style.webkitTransform = 'rotate(' + (o.rotate | 0) + 'deg)';
+});
+
+tween.on('end', function(){
+  animate = function(){};
+});
+
+function animate() {
+  raf(animate);
+  tween.update();
+}
+
+animate();
+```
+
+## API
+
+### Tween(obj:Object|Array)
+
+  Initialize a new `Tween` with `obj`.
+
+### Tween#reset()
+
+  Reset the tween.
+
+### Tween#to(obj:Object|Array)
+
+  Tween to `obj` and reset internal state.
+
+     tween.to({ x: 50, y: 100 })
+
+### Tween#duration(ms:Number)
+
+  Set duration to `ms` [500].
+
+### Tween#ease(fn:String|Function)
+
+  Set easing function to `fn`.
+
+     tween.ease('in-out-sine')
+
+### Tween#update(fn:Function)
+
+  Set update function to `fn` or
+  when no argument is given this performs
+  a "step".
+
+### Tween#stop()
+
+  Immediately stop the tween and emit "stop" and end" events. `tween.stopped`
+  is then marked as `true`.
+
+## License
+
+  MIT