import * as Cesium from 'cesium'
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import { MapTooltip } from '../Tooltip'
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import { ToolBase } from '../ToolBase'
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const POINT_ENTITY_NAME = 'edit-polygon-point'
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const DEFAULT_STYLE = {
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fill: Cesium.Color.fromBytes(45, 140, 240, 99),
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outline: Cesium.Color.fromBytes(45, 140, 240, 255),
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}
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const resolveStyle = style => ({
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fill: style?.fill || DEFAULT_STYLE.fill,
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outline: style?.outline || DEFAULT_STYLE.outline,
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})
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const normalizePoints = points =>
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(points || []).map(point => ({
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lng: point.lng ?? point.longitude,
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lat: point.lat ?? point.latitude,
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height: point.height ?? 0,
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}))
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export class EditPolygonTool extends ToolBase {
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constructor(viewer, options = {}) {
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super(viewer)
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this.tooltip = new MapTooltip(viewer)
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this.dataSource = null
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this.polygonEntity = null
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this.polylineEntity = null
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this.positions = []
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this.isDragging = false
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this.draggedIndex = -1
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this.style = resolveStyle(options?.style)
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}
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start(points = []) {
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const normalized = normalizePoints(points)
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this.positions = normalized
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.filter(point => point?.lng !== undefined && point?.lat !== undefined)
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.map(point => Cesium.Cartesian3.fromDegrees(Number(point.lng), Number(point.lat), Number(point.height || 0)))
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this.dataSource = new Cesium.CustomDataSource('edit-polygon')
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this.viewer.dataSources.add(this.dataSource)
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this.createEntities()
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this.rebuildPointEntities()
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this.initHandler()
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}
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initHandler() {
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if (!this.viewer || this.handler) return
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this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas)
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this.handler.setInputAction(movement => this.handleMouseMove(movement), Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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this.handler.setInputAction(click => this.handleLeftDown(click), Cesium.ScreenSpaceEventType.LEFT_DOWN)
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this.handler.setInputAction(() => this.handleLeftUp(), Cesium.ScreenSpaceEventType.LEFT_UP)
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this.handler.setInputAction(click => this.handleRightClick(click), Cesium.ScreenSpaceEventType.RIGHT_CLICK)
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}
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handleLeftDown(click) {
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const pickedEntity = this.viewer.scene.pick(click.position)?.id
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if (!pickedEntity || pickedEntity.name !== POINT_ENTITY_NAME) return
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const index = pickedEntity.customData?.index
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if (typeof index !== 'number') return
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this.isDragging = true
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this.draggedIndex = index
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this.disableMapControl()
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}
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handleLeftUp() {
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if (!this.isDragging) return
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this.isDragging = false
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this.draggedIndex = -1
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this.enableMapControl()
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this.notify('getPolygonPositions', this.positions)
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}
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handleMouseMove(movement) {
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this.tooltip.show('拖动顶点编辑，右键删除点', movement.endPosition)
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if (!this.isDragging || this.draggedIndex < 0) return
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const position = this.getPositionFromScreen(movement.endPosition)
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if (!position) return
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this.positions[this.draggedIndex] = position
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const pointEntity = this.dataSource.entities.values.find(
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entity => entity?.name === POINT_ENTITY_NAME && entity.customData?.index === this.draggedIndex
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)
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if (pointEntity) {
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pointEntity.position = position
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}
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}
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handleRightClick(click) {
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const pickedEntity = this.viewer.scene.pick(click.position)?.id
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if (!pickedEntity || pickedEntity.name !== POINT_ENTITY_NAME) return
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if (this.positions.length <= 3) return
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const index = pickedEntity.customData?.index
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if (typeof index !== 'number') return
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this.positions.splice(index, 1)
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this.rebuildPointEntities()
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this.notify('getPolygonPositions', this.positions)
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}
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createEntities() {
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this.polygonEntity = this.dataSource.entities.add({
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polygon: {
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hierarchy: new Cesium.CallbackProperty(
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() => new Cesium.PolygonHierarchy(this.positions),
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false
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),
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material: this.style.fill,
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outline: false,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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show: new Cesium.CallbackProperty(() => this.positions.length >= 3, false),
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},
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})
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this.polylineEntity = this.dataSource.entities.add({
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polyline: {
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positions: new Cesium.CallbackProperty(() => {
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if (this.positions.length < 2) return this.positions
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return [...this.positions, this.positions[0]]
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}, false),
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clampToGround: true,
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width: 2,
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material: this.style.outline,
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show: new Cesium.CallbackProperty(() => this.positions.length >= 2, false),
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},
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})
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}
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rebuildPointEntities() {
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this.dataSource.entities.values
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.slice()
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.filter(entity => entity?.name === POINT_ENTITY_NAME)
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.forEach(entity => this.dataSource.entities.remove(entity))
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this.positions.forEach((position, index) => {
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this.dataSource.entities.add({
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name: POINT_ENTITY_NAME,
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position: position.clone ? position.clone() : position,
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point: {
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pixelSize: 12,
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color: Cesium.Color.WHITE,
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outlineColor: this.style.outline,
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outlineWidth: 2,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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disableDepthTestDistance: Number.POSITIVE_INFINITY,
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},
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customData: {
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index,
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},
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})
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})
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}
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getPositions() {
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return this.positions.slice()
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}
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getPositionFromScreen(screenPosition) {
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const scene = this.viewer.scene
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const cartesian = scene.pickPosition(screenPosition)
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if (cartesian) return cartesian
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return scene.camera.pickEllipsoid(screenPosition, scene.globe.ellipsoid)
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}
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setStyle(style) {
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this.style = resolveStyle(style)
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if (this.polygonEntity?.polygon) {
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this.polygonEntity.polygon.material = this.style.fill
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}
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if (this.polylineEntity?.polyline) {
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this.polylineEntity.polyline.material = this.style.outline
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}
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if (this.dataSource) {
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this.dataSource.entities.values
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.filter(entity => entity?.name === POINT_ENTITY_NAME)
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.forEach(entity => {
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if (entity?.point) {
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entity.point.outlineColor = this.style.outline
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}
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})
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}
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}
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disableMapControl() {
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const controller = this.viewer.scene.screenSpaceCameraController
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controller.enableRotate = false
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controller.enableTranslate = false
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controller.enableZoom = false
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}
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enableMapControl() {
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const controller = this.viewer.scene.screenSpaceCameraController
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controller.enableRotate = true
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controller.enableTranslate = true
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controller.enableZoom = true
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}
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destroy() {
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if (this.dataSource) {
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this.dataSource.entities.removeAll()
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this.viewer.dataSources.remove(this.dataSource)
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this.dataSource = null
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}
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if (this.handler) {
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOWN)
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_UP)
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.RIGHT_CLICK)
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this.handler.destroy()
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this.handler = null
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}
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this.tooltip?.destroy()
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this.tooltip = null
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this.positions = []
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this.isDragging = false
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this.draggedIndex = -1
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}
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}
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