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Bounds.tsx
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Bounds.tsx
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import * as React from 'react'
import * as THREE from 'three'
import { useFrame, useThree } from '@react-three/fiber'
export type SizeProps = {
box: THREE.Box3
size: THREE.Vector3
center: THREE.Vector3
distance: number
}
export type BoundsApi = {
getSize: () => SizeProps
refresh(object?: THREE.Object3D | THREE.Box3): BoundsApi
reset(): BoundsApi
moveTo(position: THREE.Vector3 | [number, number, number]): BoundsApi
lookAt({
target,
up,
}: {
target?: THREE.Vector3 | [number, number, number]
up?: THREE.Vector3 | [number, number, number]
}): BoundsApi
to({ position, target }: { position: [number, number, number]; target: [number, number, number] }): BoundsApi
fit(): BoundsApi
clip(): BoundsApi
}
export type BoundsProps = JSX.IntrinsicElements['group'] & {
maxDuration?: number
margin?: number
observe?: boolean
fit?: boolean
clip?: boolean
interpolateFunc?: (t: number) => number
onFit?: (data: SizeProps) => void
}
type ControlsProto = {
update(): void
target: THREE.Vector3
maxDistance: number
addEventListener: (event: string, callback: (event: any) => void) => void
removeEventListener: (event: string, callback: (event: any) => void) => void
}
type OriginT = {
camPos: THREE.Vector3
camRot: THREE.Quaternion
camZoom: number
}
type GoalT = {
camPos: THREE.Vector3 | undefined
camRot: THREE.Quaternion | undefined
camZoom: number | undefined
camUp: THREE.Vector3 | undefined
target: THREE.Vector3 | undefined
}
// eslint-disable-next-line no-shadow
enum AnimationState {
NONE = 0,
START = 1,
ACTIVE = 2,
}
const isOrthographic = (def: THREE.Camera): def is THREE.OrthographicCamera =>
def && (def as THREE.OrthographicCamera).isOrthographicCamera
const isBox3 = (def: any): def is THREE.Box3 => def && (def as THREE.Box3).isBox3
const interpolateFuncDefault = (t: number) => {
// Imitates the previously used THREE.MathUtils.damp
return 1 - Math.exp(-5 * t) + 0.007 * t
}
const context = React.createContext<BoundsApi>(null!)
export function Bounds({
children,
maxDuration = 1.0,
margin = 1.2,
observe,
fit,
clip,
interpolateFunc = interpolateFuncDefault,
onFit,
}: BoundsProps) {
const ref = React.useRef<THREE.Group>(null!)
const { camera, size, invalidate } = useThree()
const controls = useThree((state) => state.controls as unknown as ControlsProto)
const onFitRef = React.useRef<((data: SizeProps) => void) | undefined>(onFit)
onFitRef.current = onFit
const origin = React.useRef<OriginT>({
camPos: new THREE.Vector3(),
camRot: new THREE.Quaternion(),
camZoom: 1,
})
const goal = React.useRef<GoalT>({
camPos: undefined,
camRot: undefined,
camZoom: undefined,
camUp: undefined,
target: undefined,
})
const animationState = React.useRef<AnimationState>(AnimationState.NONE)
const t = React.useRef<number>(0) // represent animation state from 0 to 1
const [box] = React.useState(() => new THREE.Box3())
const api: BoundsApi = React.useMemo(() => {
function getSize() {
const boxSize = box.getSize(new THREE.Vector3())
const center = box.getCenter(new THREE.Vector3())
const maxSize = Math.max(boxSize.x, boxSize.y, boxSize.z)
const fitHeightDistance = isOrthographic(camera)
? maxSize * 4
: maxSize / (2 * Math.atan((Math.PI * camera.fov) / 360))
const fitWidthDistance = isOrthographic(camera) ? maxSize * 4 : fitHeightDistance / camera.aspect
const distance = margin * Math.max(fitHeightDistance, fitWidthDistance)
return { box, size: boxSize, center, distance }
}
return {
getSize,
refresh(object?: THREE.Object3D | THREE.Box3) {
if (isBox3(object)) box.copy(object)
else {
const target = object || ref.current
if (!target) return this
target.updateWorldMatrix(true, true)
box.setFromObject(target)
}
if (box.isEmpty()) {
const max = camera.position.length() || 10
box.setFromCenterAndSize(new THREE.Vector3(), new THREE.Vector3(max, max, max))
}
origin.current.camPos.copy(camera.position)
origin.current.camRot.copy(camera.quaternion)
isOrthographic(camera) && (origin.current.camZoom = camera.zoom)
goal.current.camPos = undefined
goal.current.camRot = undefined
goal.current.camZoom = undefined
goal.current.camUp = undefined
goal.current.target = undefined
return this
},
reset() {
const { center, distance } = getSize()
const direction = camera.position.clone().sub(center).normalize()
goal.current.camPos = center.clone().addScaledVector(direction, distance)
goal.current.target = center.clone()
const mCamRot = new THREE.Matrix4().lookAt(goal.current.camPos, goal.current.target, camera.up)
goal.current.camRot = new THREE.Quaternion().setFromRotationMatrix(mCamRot)
animationState.current = AnimationState.START
t.current = 0
return this
},
moveTo(position: THREE.Vector3 | [number, number, number]) {
goal.current.camPos = Array.isArray(position) ? new THREE.Vector3(...position) : position.clone()
animationState.current = AnimationState.START
t.current = 0
return this
},
lookAt({
target,
up,
}: {
target: THREE.Vector3 | [number, number, number]
up?: THREE.Vector3 | [number, number, number]
}) {
goal.current.target = Array.isArray(target) ? new THREE.Vector3(...target) : target.clone()
if (up) {
goal.current.camUp = Array.isArray(up) ? new THREE.Vector3(...up) : up.clone()
} else {
goal.current.camUp = camera.up.clone()
}
const mCamRot = new THREE.Matrix4().lookAt(
goal.current.camPos || camera.position,
goal.current.target,
goal.current.camUp
)
goal.current.camRot = new THREE.Quaternion().setFromRotationMatrix(mCamRot)
animationState.current = AnimationState.START
t.current = 0
return this
},
/**
* @deprecated Use moveTo and lookAt instead
*/
to({ position, target }: { position: [number, number, number]; target?: [number, number, number] }) {
return this.moveTo(position).lookAt({ target })
},
fit() {
if (!isOrthographic(camera)) {
// For non-orthographic cameras, fit should behave exactly like reset
return this.reset()
}
// For orthographic cameras, fit should only modify the zoom value
let maxHeight = 0,
maxWidth = 0
const vertices = [
new THREE.Vector3(box.min.x, box.min.y, box.min.z),
new THREE.Vector3(box.min.x, box.max.y, box.min.z),
new THREE.Vector3(box.min.x, box.min.y, box.max.z),
new THREE.Vector3(box.min.x, box.max.y, box.max.z),
new THREE.Vector3(box.max.x, box.max.y, box.max.z),
new THREE.Vector3(box.max.x, box.max.y, box.min.z),
new THREE.Vector3(box.max.x, box.min.y, box.max.z),
new THREE.Vector3(box.max.x, box.min.y, box.min.z),
]
// Transform the center and each corner to camera space
const pos = goal.current.camPos || camera.position
const target = goal.current.target || controls?.target
const up = goal.current.camUp || camera.up
const mCamWInv = target
? new THREE.Matrix4().lookAt(pos, target, up).setPosition(pos).invert()
: camera.matrixWorldInverse
for (const v of vertices) {
v.applyMatrix4(mCamWInv)
maxHeight = Math.max(maxHeight, Math.abs(v.y))
maxWidth = Math.max(maxWidth, Math.abs(v.x))
}
maxHeight *= 2
maxWidth *= 2
const zoomForHeight = (camera.top - camera.bottom) / maxHeight
const zoomForWidth = (camera.right - camera.left) / maxWidth
goal.current.camZoom = Math.min(zoomForHeight, zoomForWidth) / margin
animationState.current = AnimationState.START
t.current = 0
onFitRef.current && onFitRef.current(this.getSize())
return this
},
clip() {
const { distance } = getSize()
camera.near = distance / 100
camera.far = distance * 100
camera.updateProjectionMatrix()
if (controls) {
controls.maxDistance = distance * 10
controls.update()
}
invalidate()
return this
},
}
}, [box, camera, controls, margin, invalidate])
React.useLayoutEffect(() => {
if (controls) {
// Try to prevent drag hijacking
const callback = () => {
if (controls && goal.current.target && animationState.current !== AnimationState.NONE) {
const front = new THREE.Vector3().setFromMatrixColumn(camera.matrix, 2)
const d0 = origin.current.camPos.distanceTo(controls.target)
const d1 = (goal.current.camPos || origin.current.camPos).distanceTo(goal.current.target)
const d = (1 - t.current) * d0 + t.current * d1
controls.target.copy(camera.position).addScaledVector(front, -d)
controls.update()
}
animationState.current = AnimationState.NONE
}
controls.addEventListener('start', callback)
return () => controls.removeEventListener('start', callback)
}
}, [controls])
// Scale pointer on window resize
const count = React.useRef(0)
React.useLayoutEffect(() => {
if (observe || count.current++ === 0) {
api.refresh()
if (fit) api.reset().fit()
if (clip) api.clip()
}
}, [size, clip, fit, observe, camera, controls])
useFrame((state, delta) => {
// This [additional animation step START] is needed to guarantee that delta used in animation isn't absurdly high (2-3 seconds) which is actually possible if rendering happens on demand...
if (animationState.current === AnimationState.START) {
animationState.current = AnimationState.ACTIVE
invalidate()
} else if (animationState.current === AnimationState.ACTIVE) {
t.current += delta / maxDuration
if (t.current >= 1) {
goal.current.camPos && camera.position.copy(goal.current.camPos)
goal.current.camRot && camera.quaternion.copy(goal.current.camRot)
goal.current.camUp && camera.up.copy(goal.current.camUp)
goal.current.camZoom && isOrthographic(camera) && (camera.zoom = goal.current.camZoom)
camera.updateMatrixWorld()
camera.updateProjectionMatrix()
if (controls && goal.current.target) {
controls.target.copy(goal.current.target)
controls.update()
}
animationState.current = AnimationState.NONE
} else {
const k = interpolateFunc(t.current)
goal.current.camPos && camera.position.lerpVectors(origin.current.camPos, goal.current.camPos, k)
goal.current.camRot && camera.quaternion.slerpQuaternions(origin.current.camRot, goal.current.camRot, k)
goal.current.camUp && camera.up.set(0, 1, 0).applyQuaternion(camera.quaternion)
goal.current.camZoom &&
isOrthographic(camera) &&
(camera.zoom = (1 - k) * origin.current.camZoom + k * goal.current.camZoom)
camera.updateMatrixWorld()
camera.updateProjectionMatrix()
}
invalidate()
}
})
return (
<group ref={ref}>
<context.Provider value={api}>{children}</context.Provider>
</group>
)
}
export function useBounds() {
return React.useContext(context)
}