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243 lines
9.1 KiB
JavaScript
243 lines
9.1 KiB
JavaScript
4 months ago
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import * as Cesium from 'cesium'
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export default class MeasureDistance {
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constructor(viewer) {
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this.viewer = viewer
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this.isMeasure = false
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this.initEvents()
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this.positions = []
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this.temPositions = [] // 鼠标移动时产生的临时点
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this.vertexEntities = [] // 节点元素
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this.lineEntity = undefined // 折线元素
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this.totalDistance = 0 // 总距离
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}
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initEvents(){
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this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas)
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}
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//激活
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activate() {
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this.registerEvents(); //注册鼠标事件
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this.isMeasure = true;
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this.totalDistance = 0 // 总距离
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//设置鼠标样式
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this.viewer._element.style.cursor = 'crosshair';
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this.viewer.enableCursorStyle = true;
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this.temPositions = [];
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this.positions = [];
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this.viewer.scene.globe.depthTestAgainstTerrain = true
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}
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//禁用
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deactivate() {
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if (!this.isMeasure) return;
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this.unRegisterEvents();
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this.viewer._element.style.cursor = 'default';
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this.viewer.enableCursorStyle = true;
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this.isMeasure = false;
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this.viewer.scene.globe.depthTestAgainstTerrain = false
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}
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//清空绘制
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clear() {
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//清除线对象
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this.viewer.entities.remove(this.lineEntity);
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this.lineEntity = undefined;
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//清除节点
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this.vertexEntities.forEach(item => {
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this.viewer.entities.remove(item);
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});
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this.vertexEntities = [];
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}
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//创建线对象
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createLineEntity() {
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this.lineEntity = this.viewer.entities.add({
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polyline: {
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positions: new Cesium.CallbackProperty(e => {
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return this.temPositions;
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}, false),
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width: 2,
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material: Cesium.Color.YELLOW,
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// depthFailMaterial: Cesium.Color.YELLOW,
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clampToGround: true,
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disableDepthTestDistance:99000000,
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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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//创建线节点
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createVertex() {
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let vertexEntity = new Cesium.Entity({
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id: "MeasureDistanceVertex" + this.positions[this.positions.length - 1],
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position: this.positions[this.positions.length - 1],
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point: {
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color: Cesium.Color.FUCHSIA,
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pixelSize: 6,
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disableDepthTestDistance:99000000,
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heightReference:Cesium.HeightReference.CLAMP_TO_GROUND,
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},
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label:{
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text: this.spaceDistance(this.positions) + "km",
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font: "2rem sans-serif",
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fillColor: Cesium.Color.WHITE,
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style: Cesium.LabelStyle.FILL,
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pixelOffset: new Cesium.Cartesian2(20, -10),
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eyeOffset: new Cesium.Cartesian3(0, 0, 0),
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horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
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verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
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// distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 20000),
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scale: 0.5,
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showBackground: true,
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backgroundColor: new Cesium.Color(0.165, 0.165, 0.165, 0.5),
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backgroundPadding: new Cesium.Cartesian2(10, 10),
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disableDepthTestDistance:99000000,
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heightReference:Cesium.HeightReference.CLAMP_TO_GROUND
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},
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});
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this.vertexEntities.push(vertexEntity)
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this.viewer.entities.add(vertexEntity)
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}
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//创建起点
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createStartEntity() {
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let vertexEntity = this.viewer.entities.add({
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position: this.positions[0],
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type: "MeasureDistanceVertex",
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point: {
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show: true,
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pixelSize: 10,
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color: Cesium.Color.RED,
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outlineColor: Cesium.Color.WHITE,
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outlineWidth: 1,
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disableDepthTestDistance:99000000,
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heightReference:Cesium.HeightReference.CLAMP_TO_GROUND,
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},
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});
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this.vertexEntities.push(vertexEntity)
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}
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//创建终点节点
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createEndEntity() {
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let vertexEntity = this.viewer.entities.add({
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position: this.positions[this.positions.length - 1],
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type: "MeasureDistanceVertex",
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label:{
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text: "总距离：" + this.totalDistance.toFixed(3) + "km",
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font: "2.5rem sans-serif",
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fillColor: Cesium.Color.WHITE,
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style: Cesium.LabelStyle.FILL,
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pixelOffset: new Cesium.Cartesian2(20, -60),
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eyeOffset: new Cesium.Cartesian3(0, 0, 30),
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horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
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verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
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// distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 20000),
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scale: 0.5,
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showBackground: true,
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backgroundColor: new Cesium.Color(0.165, 0.165, 0.165, 0.99),
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backgroundPadding: new Cesium.Cartesian2(10, 10),
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disableDepthTestDistance:99000000,
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heightReference:Cesium.HeightReference.CLAMP_TO_GROUND
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},
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// billboard: {
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// // image: "../../static/images/end.png",
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// scaleByDistance: new Cesium.NearFarScalar(300, 1, 1200, 0.4), //设置随图缩放距离和比例
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// distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 20000), //设置可见距离 10000米可见
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// verticalOrigin: Cesium.VerticalOrigin.BOTTOM
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// },
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point: {
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pixelSize: 10,
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color: Cesium.Color.RED,
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outlineColor: Cesium.Color.WHITE,
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outlineWidth: 1,
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heightReference:Cesium.HeightReference.CLAMP_TO_GROUND,
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disableDepthTestDistance:99000000
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},
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});
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this.vertexEntities.push(vertexEntity)
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}
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//注册鼠标事件
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registerEvents() {
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this.leftClickEvent();
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this.rightClickEvent();
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this.mouseMoveEvent();
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}
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//左键点击事件
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leftClickEvent() {
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//单击鼠标左键画点点击事件
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this.handler.setInputAction(e => {
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let position = this.viewer.scene.pickPosition(e.position);
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if (!position) {
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const ellipsoid = this.viewer.scene.globe.ellipsoid;
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position = this.viewer.scene.camera.pickEllipsoid(e.position, ellipsoid);
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}
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if (!position) return;
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this.positions.push(position);
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if (this.positions.length === 1) { //首次点击
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this.createLineEntity();
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this.createStartEntity();
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return;
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}
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this.createVertex();
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}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
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}
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//鼠标移动事件
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mouseMoveEvent() {
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this.handler.setInputAction(e => {
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if (!this.isMeasure) return;
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let position = this.viewer.scene.pickPosition(e.endPosition);
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if (!position) {
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position = this.viewer.scene.camera.pickEllipsoid(e.startPosition, this.viewer.scene.globe.ellipsoid);
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}
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if (!position) return;
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this.handleMoveEvent(position);
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
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}
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//处理鼠标移动
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handleMoveEvent(position) {
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if (this.positions.length < 1) return;
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this.temPositions = this.positions.concat(position);
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}
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//右键事件
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rightClickEvent() {
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this.handler.setInputAction(e => {
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if (!this.isMeasure || this.positions.length < 1) {
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this.deactivate();
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this.clear()
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} else {
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this.createEndEntity();
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this.lineEntity.polyline = {
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positions: this.positions,
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width: 2,
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material: Cesium.Color.YELLOW,
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depthFailMaterial: Cesium.Color.YELLOW
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};
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this.deactivate();
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}
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}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
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}
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//解除鼠标事件
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unRegisterEvents() {
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this.handler.removeInputAction(Cesium.ScreenSpaceEventType.RIGHT_CLICK);
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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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}
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/**
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* 计算距离
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* @param positions 长度大于1的Cartesian3数组
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*/
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spaceDistance(positions) {
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let l = positions.length
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let point1cartographic = Cesium.Cartographic.fromCartesian(positions[l-1]);
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let point2cartographic = Cesium.Cartographic.fromCartesian(positions[l-2]);
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/**根据经纬度计算出距离**/
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let geodesic = new Cesium.EllipsoidGeodesic();
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geodesic.setEndPoints(point1cartographic, point2cartographic);
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this.totalDistance += geodesic.surfaceDistance/1000
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return (geodesic.surfaceDistance/1000).toFixed(3);
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}
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}
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