focal-point

Installation

npm i @steinringer/focal-point

Usage

FocalPoints are Coordinates range between -1 and 1 for both x and y axes.

To apply these coordinates you have to use FocalPointFocus class which will make some calculations on image to fit into parent container's aspect ratios and dimensions.

<div style="width: 800px; height: 300px">
    <img id="focused-image" src="assets/fat-thor.jpg" alt="">
</div>

this.imageElement = 
    document.getElementById("focused-image") as HTMLImageElement;

this.focusedImage = new FocalPointFocus(this.imageElement, { x: 0, y: 0 });

Keep in mind

Call FocalPointFocus class in case your html template is ready to view.

f.e. In case you are using Angular, move the logic into ngAfterViewInit() lifecycle hook.