implement pinch to zoom

node_modules/component-tap-event/README.md

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+# Tap Event
+
+[![Build Status](https://secure.travis-ci.org/chemzqm/tap-event.svg)](http://travis-ci.org/chemzqm/tap-event)
+
+Make your `touchstart` event listeners into a `tap` event listener!
+
+What is "correct" behavior? The `tap` event:
+
+- shouldn't be triggered until the user removes his/her finger from the surface of the screen.
+- shouldn't be triggered when the user moves his/her finger at all (ie it should not interfere with drag events).
+- shouldn't be triggered if there's ever more than a single finger on the surface at all.
+- should never trigger the `click` event.
+
+Preserve context and arguments in 1.1.0, works with delegate easily
+
+## Install
+
+    npm install component-tap-event -S
+
+## API
+
+```js
+var tap = require('tap-event')
+
+var el = document.querySelector('#container')
+
+// the event you want to handle
+function changeLocation(e) {
+  // e.preventDefault() is already called!
+  location.href = this.href
+}
+
+// wrap the listener
+var listener = tap(changeLocation)
+
+// listen to `touchstart`
+el.addEventListener('touchstart', listener)
+
+// remove the listener
+el.removeEventListener('touchstart', listener)
+```
+
+or, more succinctly:
+
+```js
+document.querySelector('#container').addEventListener('touchstart', tap(function (e) {
+  location.href = this.href
+}))
+```
+
+To set a custom timeout (default is `200ms`), you have two options:
+
+```js
+// set globally
+tap.timeout = 300
+
+// set per instance
+tap(function (e) {
+
+}, {
+  timeout: 300
+})
+```