tldraw/components/canvas/bounds/bounding-box.tsx

import * as React from 'react'
import { Edge, Corner } from 'types'
import { useSelector } from 'state'
import { getSelectedShapes, isMobile } from 'utils/utils'

import CenterHandle from './center-handle'
import CornerHandle from './corner-handle'
import EdgeHandle from './edge-handle'
import RotateHandle from './rotate-handle'

export default function Bounds() {
  const isBrushing = useSelector((s) => s.isIn('brushSelecting'))
  const isSelecting = useSelector((s) => s.isIn('selecting'))
  const zoom = useSelector((s) => s.data.camera.zoom)
  const bounds = useSelector((s) => s.values.selectedBounds)
  const rotation = useSelector(({ data }) =>
    data.selectedIds.size === 1 ? getSelectedShapes(data)[0].rotation : 0
  )

  if (!bounds) return null
  if (!isSelecting) return null

  const size = (isMobile().any ? 12 : 8) / zoom // Touch target size

  return (
    <g
      pointerEvents={isBrushing ? 'none' : 'all'}
      transform={`
        rotate(${rotation * (180 / Math.PI)}, 
        ${(bounds.minX + bounds.maxX) / 2}, 
        ${(bounds.minY + bounds.maxY) / 2})
        translate(${bounds.minX},${bounds.minY})`}
    >
      <CenterHandle bounds={bounds} />
      <EdgeHandle size={size} bounds={bounds} edge={Edge.Top} />
      <EdgeHandle size={size} bounds={bounds} edge={Edge.Right} />
      <EdgeHandle size={size} bounds={bounds} edge={Edge.Bottom} />
      <EdgeHandle size={size} bounds={bounds} edge={Edge.Left} />
      <CornerHandle size={size} bounds={bounds} corner={Corner.TopLeft} />
      <CornerHandle size={size} bounds={bounds} corner={Corner.TopRight} />
      <CornerHandle size={size} bounds={bounds} corner={Corner.BottomRight} />
      <CornerHandle size={size} bounds={bounds} corner={Corner.BottomLeft} />
      <RotateHandle size={size} bounds={bounds} />
    </g>
  )
}