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react-focal

react-focal helps users define the focal point of their images. This allows the developer to create suitable crops for all kinds of resolutions which will always be centered around the subject of any image.

Usage

react-focal can be found on npm, so to install it, run:

$ npm install --save react-focal

Once it's installed you can use it as such:

import React from 'react';
import Focal from 'react-focal';
 
export default function MyComponent() {
  return (
    <Focal
      width={640}
      height={480}
    />
  );
}

This will render the most basic instance of Focal which doesn't really do much. It becomes more interesting when you add an onChange handler to the component.

import Focal from 'react-focal';
 
export default class MyComponent extends React.Component {
  constructor() {
    super();
 
    this.state = {
      x: 50,
      y: 50,
    };
 
    this.onChange = this.onChange.bind(this);
  }
 
  onChange(x, y) {
    this.setState({ x, y });
  }
 
  render() {
    return (
      <div>
        <Focal
          width={640}
          height={480}
          onChange={this.onChange}
        />
        <input type="hidden" name="x" value={this.state.x} />
        <input type="hidden" name="y" value={this.state.y} />
      </div>
    );
  }
}

The above example updates two hidden inputs with the new focal point coordinates every time they change. You could do something like this, or similar, in order to store the focal point in your database and then make custom crops as required.

License

MIT © Poki BV