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import { Injectable } from "@angular/core"
import { Box3, Mesh, MeshNormalMaterial, PerspectiveCamera, Vector3, Sphere, BoxGeometry, MOUSE } from "three"
import { ThreeSceneService } from "./threeSceneService"
import { MapControls } from "three/examples/jsm/controls/MapControls"
import { ThreeRendererService } from "./threeRenderer.service"
import { EventEmitter } from "../../../util/EventEmitter"
import { BehaviorSubject } from "rxjs"
type CameraChangeEvents = {
onCameraChanged: (data: { camera: PerspectiveCamera }) => void
}
@Injectable({ providedIn: "root" })
export class ThreeMapControlsService {
static CAMERA_CHANGED_EVENT_NAME = "camera-changed"
MAX_ZOOM = 200
MIN_ZOOM = 10
controls: MapControls
private eventEmitter = new EventEmitter<CameraChangeEvents>()
zoomPercentage$ = new BehaviorSubject<number>(100)
constructor(
private threeCameraService: ThreeCameraService,
private threeSceneService: ThreeSceneService,
private threeRendererService: ThreeRendererService
) {}
setControlTarget(cameraTarget: Vector3) {
this.controls.target.set(cameraTarget.x, cameraTarget.y, cameraTarget.z)
}
rotateCameraInVectorDirection(x: number, y: number, z: number) {
const zoom = this.getZoom()
this.lookAtDirectionFromTarget(x, y, z)
this.applyOldZoom(zoom)
this.threeRendererService.render()
this.onInput(this.threeCameraService.camera)
}
autoFitTo() {
setTimeout(() => {
const boundingSphere = this.getBoundingSphere()
if (boundingSphere.radius === -1) {
return
}
const length = this.cameraPerspectiveLengthCalculation(boundingSphere)
const cameraReference = this.threeCameraService.camera
cameraReference.position.set(length, length, boundingSphere.center.z)
this.controls.update()
this.focusCameraViewToCenter(boundingSphere)
this.threeRendererService.render()
this.onInput(this.threeCameraService.camera)
const scale = 1.3 // object size / display size
this.controls.maxDistance = length * 4
this.controls.minDistance = boundingSphere.radius / (10 * scale)
this.setZoomPercentage(140)
})
}
private cameraPerspectiveLengthCalculation(boundingSphere: Sphere) {
const cameraReference = this.threeCameraService.camera
//TODO: Scale Factor for object to camera ratio
const scale = 1.3 // object size / display size
const objectAngularSize = ((cameraReference.fov * Math.PI) / 180) * scale
const distanceToCamera = boundingSphere.radius / Math.tan(objectAngularSize / 2)
return Math.sqrt(Math.pow(distanceToCamera, 2) + Math.pow(distanceToCamera, 2))
}
private focusCameraViewToCenter(boundingSphere: Sphere) {
const boundingSphereCenter: Vector3 = boundingSphere.center.clone()
boundingSphereCenter.setY(0)
this.controls.target.set(boundingSphereCenter.x, boundingSphereCenter.y, boundingSphereCenter.z)
this.threeCameraService.camera.lookAt(boundingSphereCenter)
this.threeCameraService.camera.updateProjectionMatrix()
}
getBoundingSphere() {
return new Box3().setFromObject(this.threeSceneService.mapGeometry).getBoundingSphere(new Sphere())
}
private lookAtDirectionFromTarget(x: number, y: number, z: number) {
this.threeCameraService.camera.position.set(this.controls.target.x, this.controls.target.y, this.controls.target.z)
const alignmentCube = new Mesh(new BoxGeometry(20, 20, 20), new MeshNormalMaterial())
this.threeSceneService.scene.add(alignmentCube)
alignmentCube.position.set(this.controls.target.x, this.controls.target.y, this.controls.target.z)
alignmentCube.translateX(x)
alignmentCube.translateY(y)
alignmentCube.translateZ(z)
this.threeCameraService.camera.lookAt(alignmentCube.getWorldPosition(alignmentCube.position))
this.threeSceneService.scene.remove(alignmentCube)
}
private getZoom() {
return this.threeCameraService.camera.position.distanceTo(this.controls.target)
}
private applyOldZoom(oldZoom: number) {
this.threeCameraService.camera.translateZ(oldZoom)
}
init(domElement: HTMLCanvasElement) {
this.controls = new MapControls(this.threeCameraService.camera, domElement)
this.controls.mouseButtons = {
LEFT: MOUSE.ROTATE,
MIDDLE: MOUSE.DOLLY,
RIGHT: MOUSE.PAN
}
this.controls.zoomToCursor = true
const updateZoomToCursor = (event: KeyboardEvent | MouseEvent) => {
this.controls.zoomToCursor = !event.altKey
}
window.addEventListener("keydown", updateZoomToCursor)
window.addEventListener("keyup", updateZoomToCursor)
window.addEventListener("mousemove", updateZoomToCursor)
this.controls.minPolarAngle = 0
this.controls.maxPolarAngle = Math.PI / 2
this.controls.listenToKeyEvents(window)
this.controls.addEventListener("change", () => {
this.onInput(this.threeCameraService.camera)
this.updateZoomPercentage()
this.threeRendererService.render()
})
this.updateZoomPercentage()
}
onInput(camera: PerspectiveCamera) {
this.setControlTarget(this.controls.target)
this.eventEmitter.emit("onCameraChanged", { camera })
}
subscribe<Key extends keyof CameraChangeEvents>(key: Key, callback: CameraChangeEvents[Key]) {
this.eventEmitter.on(key, data => {
callback(data)
})
}
getZoomPercentage(distance: number): number {
const min = this.controls.minDistance
const max = this.controls.maxDistance
if (distance <= min) {
return this.MAX_ZOOM
}
if (distance >= max) {
return this.MIN_ZOOM
}
const range = max - min
return this.MAX_ZOOM - ((distance - min) / range) * (this.MAX_ZOOM - this.MIN_ZOOM)
}
getDistanceFromZoomPercentage(percentage: number): number {
const min = this.controls.minDistance
const max = this.controls.maxDistance
const range = max - min
return min + ((this.MAX_ZOOM - percentage) / (this.MAX_ZOOM - this.MIN_ZOOM)) * range
}
updateZoomPercentage() {
const distance = this.threeCameraService.camera.position.distanceTo(this.controls.target)
const zoomFactor = this.getZoomPercentage(distance)
this.zoomPercentage$.next(zoomFactor)
}
setZoomPercentage(zoom: number) {
const newDistance = this.getDistanceFromZoomPercentage(zoom)
const direction = new Vector3().subVectors(this.threeCameraService.camera.position, this.controls.target).normalize()
this.threeCameraService.camera.position.copy(this.controls.target).add(direction.multiplyScalar(newDistance))
this.controls.update()
this.zoomPercentage$.next(zoom)
}
}
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