Function fromFlatArray

fromFlatArray(array: readonly number[]): Geometry.Line
Returns a line from four numbers [x1,y1,x2,y2].

See toFlatArray to create an array from a line.
```
import { Lines } from 'https://unpkg.com/ixfx/dist/geometry.js'
const line = Lines.fromFlatArray(...[0, 0, 100, 100]);
// line is {a: { x:0, y:0 }, b: { x: 100, y: 100 } }
```
Parameters
- array: readonly number[]
  Array in the form [x1,y1,x2,y2]
Returns Geometry.Line
Line