andy-react-native-svg-draw

react-native-svg-draw

React Native drawing component based on SVG with editable annotations

Features

• Draw arrow, rectangle, ellipse ... on picture or blank view
• Compatible with Expo
• Built with react-native-reanimated v2
• Save result with react-native-view-shot
• Fully customisable

Installation

Bare react native app

npm install @archireport/react-native-svg-draw react-native-reanimated react-native-gesture-handler react-native-svg react-native-view-shot react-native-linear-gradient

Expo

expo install @archireport/react-native-svg-draw react-native-reanimated react-native-gesture-handler react-native-svg react-native-view-shot expo-linear-gradient

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⚠️ extra steps are required

React Native Gesture Handler needs extra steps to finalize its installation, please follow their installation instructions.

React Native Reanimated needs extra steps to finalize its installation, please follow their installation instructions.

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Usage

Bare react native app

import { DrawWithOptions } from 'react-native-svg-draw';
import LinearGradient from 'react-native-linear-gradient';

// ...
  <DrawWithOptions linearGradient={LinearGradient} />

Expo

import { DrawWithOptions } from 'react-native-svg-draw';
import { LinearGradient } from 'expo-linear-gradient';

// ...
  <DrawWithOptions linearGradient={LinearGradient} />

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How it works

You have 2 options

Use DrawWithOptions provided by the lib

Fast and easy way to use the lib. Example :

  <DrawWithOptions
    linearGradient={LinearGradient}
    image={require('./pexels-sebastian-palomino-2847766.jpg')}
    close={() => true}
    takeSnapshot={(snap) => {
      snap.then((uri) => console.log('snapShot uri:', uri));
    }}
  />

Use your own "DrawWithOptions" component

You can create your own "DrawWithOptions" component and customize the ui.

You will need to use DrawCore component wrapped in DrawProvider context.

<DrawProvider>
  <DrawCore image={require('./pexels-sebastian-palomino-2847766.jpg')}/>
</DrawProvider>

Then you can use the hook "useDrawHook" inside your components to interact with the context. This hook expose a lot of functions and objects that can be used to interact with the DrawCore.

  const {
    drawState,
    dispatchDrawStates,
    itemIsSelected,
    cancelLastAction,
    deleteSelectedItem,
    ...
  } = useDrawHook();

useDrawHook

Name	Type	Description
strokeWidth	shared value(number)	Object from react-native-reanimated, get and set value => strokeWidth.value
color	shared value(hslColor)	Object from react-native-reanimated, get and set value => color.value
onColorStrokeChange	function	Function use when changing color or strokeWidth is done to memorize action for undo
drawState	object	Get the selected drawingMode : 'singleHead','doubleHead','rectangle','ellipse','text','pen', cancelEnabled is true when last action can be canceled, doneItems contains all previous draw items and screenStates helps to go back in time (cancel pops last state)
dispatchDrawStates	function	Can be used to update drawingMode
itemIsSelected	shared value(boolean)	Object from react-native-reanimated Indicate if an item is selected, to get value => itemIsSelected.value
cancelLastAction	function	Call this function when user press your undo button
takeSnapshot	function	This async function will return the uri of your drawing
deleteSelectedItem	function	Call this function when you want to delete the selected item

Recommendation

Copy the drawWithOptions component, sliders component and adjust styles to match your theme

Components

DrawWithOptions

Component with header and footer, based on DrawCore

Properties

Name	Type	Description
close	function	(optional) called when cross is pressed
takeSnapshot	function	(optional) called when send button (at the top right) is pressed
linearGradient	React Component	implementation used for linear gradient (differs between expo and bare react native app)
image	image	(optional) background picture
backgroundColor	string	(optional) background color of the draw zone

DrawCore

Component where the user can draw

Properties

Name	Type	Description
image	image	(optional) background picture
backgroundColor	string	(optional) background color of the draw zone

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT