ngx-pinch-zoom

Pinch zoom for Angular

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.

🔬️ Help make Pinch zoom better by answering a few questions.

Installation

Install the npm package.

npm i ngx-pinch-zoom

Import module:

import { PinchZoomModule } from '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">.

<pinch-zoom>
    <img src="path_to_image" /> 
</pinch-zoom>

Properties

name	type	default	description
transition-duration	number	200	Defines the speed of the animation of positioning and transforming.
limit-zoom	number	3	Limit the maximum available scale.
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.

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.

Events

name	type	description
touchstart	{name: "touchstart"}	One or more touch points are placed on the touch surface.
touchend	{name: "touchend"}	One or more touch points are removed from the touch surface.
pan	{name: "pan", detail: {moveX: number, moveY: number}}	A user moves a zoomed image in any direction by a finger.
pinch	{name: "pinch", detail: {scale: number}}	A user zooms an image in or out by two fingers.
double-tap	{name: "double-tap"}	Double touch, consisting of two quick taps.
zoom-in	{name: "zoom-in"}	Zoom-in event is opened, when an image is zoomed in by the button (zoom icon with "+") or by toggleZoom method.
zoom-out	{name: "zoom-out"}	Zoom-in event is opened, when an image is zoomed out by the button (zoom icon with "-") or by toggleZoom method.

Sponsors

Tested using Browserstack