Summary:
New a Path instance will cause a slice call to exist path.
```js
// react-native/Libraries/ART/ARTSerializablePath.js
if (path instanceof SerializablePath) {
this.path = path.path.slice(0);
}
```
Most of d3's APIs can set context when we don't want to use d3's build-in path object. And in RN envirenment, we must use RN's path instance. So we can use RN's path as a context in d3 avoiding doing conversions from svg's path string to arrays. But with existing code, when Shape receive a `d` proprety, it new a path instance and will cause calling slice in a very large array.
Typical usage is as follows
```js
import React from 'react';
import { View, ART } from 'react-native';
import { line } from 'd3-shape';
import { scaleLinear } from 'd3-scale';
const { Path, Surface, Shape } = ART;
const width = 360;
const height = 300;
const data = [5,2,7,6,9,1,8,4,3];
const x = scaleLinear().range([0, width]).domain([0, data.length]);
const y = scaleLinear().range([height, 0]).domain([0, 9]);
const myline = line()
.x(function(d, i) {
return x(i);
})
.y(function(d) { return y(d); });
// use RN's ART Path
const path = Path();
myline.context(path)(data);
class TestArt extends React.Component {
render() {
return (
<View>
<Surface width={width} height={height}>
<Shape
stroke="red"
d={
// use RN's ART Path
path
// use d3's path
// myline(data)
}
/>
</Surface>
</View>
);
}
}
```
Closes https://github.com/facebook/react-native/pull/14551
Differential Revision: D5398653
Pulled By: javache
fbshipit-source-id: 1264acfb8844b60584604a664e0474f9e212d1d1
6b29fe78c4