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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import {
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getBoundsFromCartesians,
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getCenterFromBounds,
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getMetersBetween,
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buildEllipsePositions,
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} from '../shapeUtils'
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export class DrawEllipseTool extends ToolBase {
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constructor(viewer) {
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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.ellipseEntity = null
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this.startPosition = null
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this.endPosition = null
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this.centerCartesian = null
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this.semiMajor = 0
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this.semiMinor = 0
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this.isDrawing = false
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}
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start() {
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this.dataSource = new Cesium.CustomDataSource('draw-ellipse')
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this.viewer.dataSources.add(this.dataSource)
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this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas)
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this.handler.setInputAction(click => this.handleLeftClick(click), Cesium.ScreenSpaceEventType.LEFT_CLICK)
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this.handler.setInputAction(movement => this.handleMouseMove(movement), Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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this.tooltip.show('单击设置起点', { x: 0, y: 0 })
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}
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handleLeftClick(click) {
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const position = this.getPositionFromScreen(click.position)
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if (!position) return
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if (!this.startPosition) {
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this.startPosition = position
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this.endPosition = position
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this.isDrawing = true
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this.createEntities()
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this.tooltip.show('单击结束绘制', click.position)
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return
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}
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if (this.isDrawing) {
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this.endPosition = position
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this.updateEllipseByBounds()
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this.isDrawing = false
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const positions = buildEllipsePositions(this.centerCartesian, this.semiMajor, this.semiMinor)
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this.notify('getPolygonPositions', positions)
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this.tooltip.hide()
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this.clearPreviewEntities()
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}
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}
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handleMouseMove(movement) {
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if (!this.isDrawing) {
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this.tooltip.move(movement.endPosition)
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return
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}
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const position = this.getPositionFromScreen(movement.endPosition)
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if (!position) return
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this.endPosition = position
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this.updateEllipseByBounds()
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this.tooltip.move(movement.endPosition)
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}
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updateEllipseByBounds() {
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const bounds = getBoundsFromCartesians([this.startPosition, this.endPosition])
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const center = getCenterFromBounds(bounds)
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if (!bounds || !center) return
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this.centerCartesian = Cesium.Cartesian3.fromRadians(center.longitude, center.latitude)
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const eastWest = getMetersBetween(
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new Cesium.Cartographic(bounds.west, center.latitude),
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new Cesium.Cartographic(bounds.east, center.latitude)
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)
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const northSouth = getMetersBetween(
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new Cesium.Cartographic(center.longitude, bounds.south),
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new Cesium.Cartographic(center.longitude, bounds.north)
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)
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this.semiMajor = Math.max(1, eastWest / 2)
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this.semiMinor = Math.max(1, northSouth / 2)
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}
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createEntities() {
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if (this.ellipseEntity) return
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this.ellipseEntity = this.dataSource.entities.add({
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position: new Cesium.CallbackProperty(() => this.centerCartesian, false),
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ellipse: {
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semiMajorAxis: new Cesium.CallbackProperty(() => this.semiMajor, false),
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semiMinorAxis: new Cesium.CallbackProperty(() => this.semiMinor, false),
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material: Cesium.Color.fromBytes(45, 140, 240, 99),
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outline: true,
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outlineColor: Cesium.Color.fromBytes(45, 140, 240, 255),
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outlineWidth: 2,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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},
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})
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}
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clearPreviewEntities() {
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if (!this.dataSource) return
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this.dataSource.entities.removeAll()
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this.ellipseEntity = null
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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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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.LEFT_CLICK)
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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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.startPosition = null
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this.endPosition = null
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this.centerCartesian = null
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this.isDrawing = false
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}
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}
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