server/aspnetapp/wwwroot/lib/pinch-zoom-js/README.md

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# PinchZoom.js

PinchZoom is a Javascript library providing multi-touch gestures for zooming and dragging on any DOM element.

## Installation

- Use the [NPM package](https://www.npmjs.com/package/pinch-zoom-js).
- Link directly to the [minified script](https://unpkg.com/pinch-zoom-js/dist/pinch-zoom.min.js) via [UNPKG](https://unpkg.com). Make sure you specify a version.
- Compile from source. 👾

## Usage

### Requirements
* No dependencies, built with vanilla JS.
* A modern browser (ECMA 5 support, http://caniuse.com/use-strict).

### Initialisation

```Javascript

let el = document.querySelector('#my-id');
let pz = new PinchZoom(el, options);

```

### Options

```Text

tapZoomFactor:      Zoom factor that a double tap zooms to. (default 2)
zoomOutFactor:      Resizes to original size when zoom factor is below this value. (default 1.3)
animationDuration:  Animation duration in milliseconds. (default 300)
maxZoom:            Maximum zoom factor. (default 4)
minZoom:            Minimum zoom factor. (default 0.5)
draggableUnzoomed:  Capture drag events even when the image isn't zoomed. (default true)
                    (using `false` allows other libs (e.g. swipe) to pick up drag events)
lockDragAxis:       Lock panning of the element to a single axis. (default false)
setOffsetsOnce:     Compute offsets (image position inside container) only once. (default false)
                    (using `true` maintains the offset on consecutive `load` and `resize`)
use2d:              Fall back to 2D transforms when idle. (default true)
                    (a truthy value will still use 3D transforms during animation)
verticalPadding:    Vertical padding to apply around the image. (default 0)
horizontalPadding:  Horizontal padding to apply around the image. (default 0)

onZoomStart:        Callback for zoomstart event (params: Pinchzoom object, Event event) (default null)
onZoomEnd:          Callback for zoomend event (params: Pinchzoom object, Event event) (default null)
onZoomUpdate:       Callback for zoomupdate event (params: Pinchzoom object, Event event) (default null)
onDragStart:        Callback for dragstart event (params: Pinchzoom object, Event event) (default null)
onDragEnd:          Callback for dragend event (params: Pinchzoom object, Event event) (default null)
onDragUpdate:       Callback for dragupdate event (params: Pinchzoom object, Event event) (default null)
onDoubleTap:        Callback for doubletap event (params: Pinchzoom object, Event event) (default null)
```

### Methods

```Javascript
let pz = new PinchZoom(myElement);

pz.enable(); // Enables all gesture capturing (is enabled by default)
pz.disable(); // Disables all gesture capturing
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