Function getExitSideFromRect

packages/ui/src/hooks/use-pointer-in-transit.ts:13–31

(point: Point, rect: DOMRect)

type Polygon = Point[]

function getExitSideFromRect(point: Point, rect: DOMRect) {
  const top = Math.abs(rect.top - point.y)
  const bottom = Math.abs(rect.bottom - point.y)
  const right = Math.abs(rect.right - point.x)
  const left = Math.abs(rect.left - point.x)

  switch (Math.min(top, bottom, right, left)) {
    case left:
      return 'left'
    case right:
      return 'right'
    case top:
      return 'top'
    case bottom:
      return 'bottom'
    default:
      return null
  }
}

function getPointsFromRect(rect: DOMRect) {
  const { top, right, bottom, left } = rect