Expo Image Deep Zoom

Use MapView to zoom big images

Installation

yarn add expo-image-deep-zoom

Usage

import React from 'react'
import { InteractionManager, ActivityIndicator } from 'react-native'
import * as FileSystem from 'expo-file-system'
 
import DeepZoom from 'expo-image-deep-zoom'
 
export default class Planta extends React.Component {
  static navigationOptions = { title: 'Planta' }
  state = { uri: null, cacheDirectory: null }
 
  componentDidMount() {
    InteractionManager.runAfterInteractions(() => {
      const uri = `${FileSystem.documentDirectory}my-image.jpg`
      const cacheDirectory = `${FileSystem.documentDirectory}my-image`
      this.setState({ cacheDirectory, uri })
    })
  }
 
  render() {
    const { uri } = this.state
 
    if (!uri) return <ActivityIndicator size='large' style={{ flex: 1 }}/>
    return <DeepZoom
      imageUri={this.state.uri}
      cacheDirectory={this.state.cacheDirectory}
      maxZoom={6}
    />
  }
}

Author

Daniel Fernando Lourusso