react-map-interaction

Add map like zooming and panning to any React element. This works on both touch devices (pinch to zoom, drag to pan) as well as with a mouse or trackpad (wheel scroll to zoom, mouse drag to pan).

Install

npm install --save react-map-interaction

Examples

Basic

import { MapInteractionCSS } from 'react-map-interaction';

// This component uses CSS to scale your content.
// Just pass in content as children and it will take care of the rest.
const ThingMap = () => {
  return (
    <MapInteractionCSS>
      <img src="path/to/thing.png" />
    </MapInteractionCSS>
  );
}

Usage without CSS

import { MapInteraction } from 'react-map-interaction';

// Use MapInteraction if you want to determine how to use the resulting translation.
const NotUsingCSS = () => {
  <MapInteraction>
    {
      ({ translation, scale }) => { /* Use the passed values to scale content on your own. */ }
    }
  </MapInteraction>
}

Controlled

import { MapInteractionCSS } from 'react-map-interaction';

// If you want to have control over the scale and translation,
// then use the `scale`, `translation`, and `onChange` props.
class Controlled extends Component {
  constructor(props) {
    super(props);
    this.state = {
      scale: 1,
      translation: { x: 0, y: 0 }
    };
  }

  render() {
    const { scale, translation } = this.state;
    return (
      <MapInteractionCSS
        scale={scale}
        translation={translation}
        onChange={({ scale, translation }) => this.setState({ scale, translation })}
      >
        <img src="path/to/thing.png" />
      </MapInteractionCSS>
    );
  }
}

Prop Types for MapInteractionCSS (all optional)

MapInteraction doesn't require any props. It will control its own internal state, and pass values to its children. If you need to control the scale and translation then you can pass those values as props and listen to the onChange event to receive updates.

{
  // The scale applied to the dimensions of the contents. A scale of 1 means the
  // contents appear at actual size, greater than 1 is zoomed, and between 0 and 1 is shrunken.
  scale: PropTypes.number,
  defaultScale: PropTypes.number,

  // The distance in pixels to translate the contents by.
  translation: PropTypes.shape({ x: PropTypes.number, y: PropTypes.number }),
  defaultTranslation: PropTypes.shape({ x: PropTypes.number, y: PropTypes.number }),

  // Called with an object { scale, translation }
  onChange: PropTypes.func,

  // The min and max of the scale of the zoom. Must be > 0.
  minScale: PropTypes.number,
  maxScale: PropTypes.number,

  // When 'showControls' is 'true', plus/minus buttons are rendered
  // that let the user control the zoom factor
  showControls: PropTypes.bool,

  // Content to render in each of the control buttons (only when 'showControls' is 'true')
  plusBtnContents: PropTypes.node,
  minusBtnContents: PropTypes.node,

  // Class applied to the plus/minus buttons (only when 'showControls' is 'true')
  btnClass: PropTypes.string
};

Prop Types for MapInteraction (all optional)

{
  // Function called with an object { translation, scale }
  // translation: { x: number, y: number }, The current origin of the content
  // scale:       number, The current multiplier mapping original coordinates to current coordinates
  children: PropTypes.func,

  // The rest of the prop types are the same as MapInteractionCSS
  ...MapInteractionCSS.propTypes,
}