# Pinch zoom for Angular
## Note 2
This Project has been forked to update:
- Add a listener to detect zoom changes (onZoomChange)="zoomChange($event) [demo](https://mapaxe.github.io/ngx-pinch-zoom/#on-zoom-change-event)
- Adds functionality to modify the zoom state programmatically [demo](https://mapaxe.github.io/ngx-pinch-zoom/#on-external-control-with-programmatically-methods)
- Adds functionality to modify the zoom state programmatically at a specific point (in this example the click) [demo](https://mapaxe.github.io/ngx-pinch-zoom/#zoom-on-click)
## Note 1
This Project has been forked to update to the newest Angular 16 Version.
The module provides opportunities for image zooming in, zooming out and positioning with use of gestures on a touch screen.
Live demos and source code samples can be found on [home page](http://ivylab.space/pinch-zoom).
🔬️ Help make Pinch zoom better by [answering a few questions](https://docs.google.com/forms/d/e/1FAIpQLSfDW_yLcKTlRzhUy3PMAFMgmsmy9cNyeML8hQ8rOgM3PEIKGA/viewform?usp=sf_link).
## Installation
Install the npm package.
```
npm i @meddv/ngx-pinch-zoom
```
Import module:
```ts
import { PinchZoomModule } from '@meddv/ngx-pinch-zoom';
@NgModule({
imports: [ PinchZoomModule ]
})
```
## Usage
For use, put your image inside the <pinch-zoom> container. Please, pay attention to the parameters of your viewport metatag. If you use Pinch Zoom, it is required to limit zooming of a web-page, by entering the following parameters: <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">.
```html
```
## Properties
| name | type | default | description |
|---------------------| ----------------------------- | --------------------- |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| transition-duration | number | 200 | Defines the speed of the animation of positioning and transforming. |
| limit-zoom | number, "original image size" | "original image size" | Limit the maximum available scale. By default, the maximum scale is calculated based on the original image size. |
| minScale | number | 0 | Limit the minimum acceptable scale. With a value of 1, it is recommended to use this parameter with `limitPan` |
| auto-zoom-out | boolean | false | Automatic restoration of the original size of an image after its zooming in by two fingers. |
| double-tap | boolean | true | Zooming in and zooming out of an image, depending on its current condition, with double tap. |
| disabled | boolean | false | Disable zoom. |
| disablePan | boolean | false | Turn off panning with one finger. |
| overflow | "hidden", "visible" | "hidden" | `hidden` - the overflow is clipped, and the rest of the content will be invisible. `visible` - the overflow is not clipped. The content renders outside the element's box. |
| disableZoomControl | "disable", "never", "auto" | "auto" | Disable zoom controls. `auto` - Disable zoom controls on touch screen devices. `never` - show zoom controls on all devices. `disable` - disable zoom controls on all devices. |
| zoomControlScale | number | 1 | Zoom factor when using zoom controls. |
| backgroundColor | string | "rgba(0,0,0,0.85)" | The background color of the container. |
| limitPan | boolean | false | Stop panning when the edge of the image reaches the edge of the screen. |
| minPanScale | number | 1.0001 | Minimum zoom at which panning is enabled. |
| listeners | "auto", "mouse and touch" | "mouse and touch" | By default, subscriptions are made for mouse and touch screen events. The value `auto` means that the subscription will be only for touch events or only for mouse events, depending on the type of screen. |
| wheel | boolean | true | Scale with the mouse wheel. |
| wheelZoomFactor | number | 0.2 | Zoom factor when zoomed in with the mouse wheel. |
| stepZoomFactor | number | 0.2 | Zoom factor when zoomed in/out with external control and zoom in with mouse click. |
| autoHeight | boolean | false | Calculate the height of the container based on the `width` and `height` attributes of the image. By default, the width of the container is 100%, and the height is determined after the image information is loaded - this may cause a delay in determining the height of the container. If you want the container to initially have dimensions corresponding to the dimensions of the image, then specify the attributes `width` and `height` for the `![]()
` tag. When setting the property value to `true`, a subscription to the window resize listener will be created. |
| draggableImage | boolean | false | Sets the attribute `draggable` to the `![]()
` tag. |
## Outputs
| name | description |
|---------------------|--------------------------------------------------------------------------------------------|
| (onZoomChange) | Returns a ZoomEvent objet on every change of state |
```
interface ZoomEvent {
scale: number;
moveX: number;
moveY: number;
}
```
## Methods
| name | description |
|-------------------------------------|----------------------------------------------------------------------------------------------------------------------------------|
| toggleZoom() | Image zooming in and out, depending on its current state. |
| destroy() | Unsubscribe from mouse events and touches, as well as remove added styles from the DOM tree. |
| zoomIn() | Allows zooming in a step with an external control, requires a value defined in the `stepZoomFactor` property |
| resetZoom() | Unsubscribe from mouse events and touches, as well as remove added styles from the DOM tree. |
| zoomOut() | Allows zooming out a step with an external control, requires a value defined in the `stepZoomFactor` property |
| zoomPoint(newPoint: MouseZoomPoint) | Allows zooming in a step with an external control in a specific point, requires a value defined in the `stepZoomFactor` property |
```
interface MouseZoomPoint{
clientX: number;
clientY: number;
}
```
See the full documentation and examples on the [home page](http://ivylab.space/pinch-zoom).
## Author services
Are you interested in this library but lacks features? [Write to the author](https://github.com/drozhzhin-n-e), he can do it for you.
## Sponsors
Tested using Browserstack
[](http://browserstack.com/)