Drawing rounded cornered rectangle in react-native ART.

App.tsx

import React from 'react'
import { View, ART } from 'react-native'
import Rect from './Rect'
const {Surface} = ART

function App(){
  return(
    <View style={{backgroundColor: 'rgba(37, 72, 101, 1.0)'}}>
      <Surface width={300} height={300}>
        <Rect width={100} height={100} fill={'yellow'} stroke={'green'} x={10} y={20} bottomRightRadius={100} bottomLeftRadius={20} topRightRadius={10}/>
            <Rect strokeDash={[0,4]} width={20} height={100} fill={'rgba(255,0,0, 0.09)'} stroke={'red'} x={10} y={130} rc={50}/>
      </Surface>
    </View>
  )
}

Rect.tsx

import React from 'react'
import PropTypes from 'prop-types'
import {ART} from 'react-native'
const {Group, Shape, Path} = ART

function Rect({fill, stroke, x, width, y, rc, height, topLeftRadius, topRightRadius, bottomRightRadius, bottomLeftRadius, ...rest}){
    const startX = 0;
    const startY = 0;
    const smallDimension = width > height ? height : width;
    let tlr = topLeftRadius !== null ? topLeftRadius : rc; tlr =  tlr > smallDimension/2 ? smallDimension /2 : tlr;
    let trr = topRightRadius !== null ? topRightRadius : rc; trr = trr > smallDimension/2 ? smallDimension /2 : trr;
    let brr = bottomRightRadius !== null ? bottomRightRadius : rc; brr = brr > smallDimension/2 ? smallDimension /2 : brr;
    let blr = bottomLeftRadius !== null ? bottomLeftRadius : rc; blr = blr > smallDimension/2 ? smallDimension /2 : blr;
    const d = Path()
                .move(startX, startY)
                .move(startX, tlr)
                .arc( tlr, startY-tlr, tlr, tlr, false, false) // top left
                .lineTo(width - trr, startY)
                .arc( trr, startX+trr, trr, trr, false, false) // top right
                .lineTo(width, startY+ (height - brr))
                .arc(startX-brr, brr, brr, brr, false, false) // bottom right
                .lineTo(startX + blr, height)
                .arc(startX-blr, startY-blr, blr, blr, false, false) // bottom right
                .close()
              
    return(
        <Group x={x} y={y}>
            <Shape {...rest} fill={fill} stroke={stroke} d={d}/>
        </Group>
    )
}

Rect.propTypes = {
    width: PropTypes.number.isRequired,
    height: PropTypes.number.isRequired,
    x: PropTypes.number,
    y: PropTypes.number,
    fill: PropTypes.string,
    stroke: PropTypes.string,
    topLeftRadius: PropTypes.number,
    topRightRadius: PropTypes.number,
    bottomRightRadius: PropTypes.number,
    bottomLeftRadius: PropTypes.number,
    rc: PropTypes.number
}

Rect.defaultProps = {
    x: 0,
    y: 0,
    fill: 'transparent',
    stroke: 'red',
    topLeftRadius: null,
    topRightRadius: null,
    bottomRightRadius: null,
    bottomLeftRadius: null,
    rc: 0
}

export default Rect

React native ios device. rounded corner rectangles.