网上找的大神的实现方法有点问题，实现有一些bug，作为cesium新手一个，弃之不忍，只好硬着头皮修改了，不过还好问题不大，再次mark一下，下次就可以直接用了

 

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import Cesium from "cesium/Cesium";import widgets from "cesium/Widgets/widgets.css"; export default { //测量空间直线距离 /******************************************* */ measureLineSpace(viewer, handler) { // 取消双击事件-追踪该位置 viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK); handler = new Cesium.ScreenSpaceEventHandler(viewer.scene._imageryLayerCollection); var positions = []; var poly = null; // var tooltip = document.getElementById("toolTip"); var distance = 0; var cartesian = null; var floatingPoint; // tooltip.style.display = "block"; handler.setInputAction(function (movement) { // tooltip.style.left = movement.endPosition.x + 3 + "px"; // tooltip.style.top = movement.endPosition.y - 25 + "px"; // tooltip.innerHTML = '
单击开始，右击结束
'; // cartesian = viewer.scene.pickPosition(movement.endPosition); let ray = viewer.camera.getPickRay(movement.endPosition); cartesian = viewer.scene.globe.pick(ray, viewer.scene); //cartesian = viewer.scene.camera.pickEllipsoid(movement.endPosition, viewer.scene.globe.ellipsoid); if (positions.length >= 2) { if (!Cesium.defined(poly)) { poly = new PolyLinePrimitive(positions); } else { positions.pop(); // cartesian.y += (1 + Math.random()); positions.push(cartesian); } distance = getSpaceDistance(positions); // console.log("distance: " + distance); // tooltip.innerHTML='
'+distance+'米
'; } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); handler.setInputAction(function (movement) { // tooltip.style.display = "none"; // cartesian = viewer.scene.camera.pickEllipsoid(movement.position, viewer.scene.globe.ellipsoid); // cartesian = viewer.scene.pickPosition(movement.position); let ray = viewer.camera.getPickRay(movement.position); cartesian = viewer.scene.globe.pick(ray, viewer.scene); if (positions.length == 0) { positions.push(cartesian.clone()); } positions.push(cartesian); //在三维场景中添加Label // var cartographic = Cesium.Cartographic.fromCartesian(cartesian); var textDisance = distance + "米"; // console.log(textDisance + ",lng:" + cartographic.longitude/Math.PI*180.0); floatingPoint = viewer.entities.add({ name: '空间直线距离', // position: Cesium.Cartesian3.fromDegrees(cartographic.longitude / Math.PI * 180, cartographic.latitude / Math.PI * 180,cartographic.height), position: positions[positions.length - 1], point: { pixelSize: 5, color: Cesium.Color.RED, outlineColor: Cesium.Color.WHITE, outlineWidth: 2, }, label: { text: textDisance, font: '18px sans-serif', fillColor: Cesium.Color.GOLD, style: Cesium.LabelStyle.FILL_AND_OUTLINE, outlineWidth: 2, verticalOrigin: Cesium.VerticalOrigin.BOTTOM, pixelOffset: new Cesium.Cartesian2(20, -20), } }); }, Cesium.ScreenSpaceEventType.LEFT_CLICK); handler.setInputAction(function (movement) { handler.destroy(); //关闭事件句柄 positions.pop(); //最后一个点无效 // viewer.entities.remove(floatingPoint); // tooltip.style.display = "none"; }, Cesium.ScreenSpaceEventType.RIGHT_CLICK); var PolyLinePrimitive = (function () { function _(positions) { this.options = { name: '直线', polyline: { show: true, positions: [], material: Cesium.Color.CHARTREUSE, width: 10, clampToGround: true } }; this.positions = positions; this._init(); } _.prototype._init = function () { var _self = this; var _update = function () { return _self.positions; }; //实时更新polyline.positions this.options.polyline.positions = new Cesium.CallbackProperty(_update, false); viewer.entities.add(this.options); }; return _; })(); //空间两点距离计算函数 function getSpaceDistance(positions) { var distance = 0; for (var i = 0; i < positions.length - 1; i++) { var point1cartographic = Cesium.Cartographic.fromCartesian(positions[i]); var point2cartographic = Cesium.Cartographic.fromCartesian(positions[i + 1]); /**根据经纬度计算出距离**/ var geodesic = new Cesium.EllipsoidGeodesic(); geodesic.setEndPoints(point1cartographic, point2cartographic); var s = geodesic.surfaceDistance; //console.log(Math.sqrt(Math.pow(distance, 2) + Math.pow(endheight, 2))); //返回两点之间的距离 s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2)); distance = distance + s; } return distance.toFixed(2); } }, //****************************测量空间面积************************************************// measureAreaSpace(viewer, handler){ // 取消双击事件-追踪该位置 viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK); // 鼠标事件 handler = new Cesium.ScreenSpaceEventHandler(viewer.scene._imageryLayerCollection); var positions = []; var tempPoints = []; var polygon = null; // var tooltip = document.getElementById("toolTip"); var cartesian = null; var floatingPoint;//浮动点 // tooltip.style.display = "block"; handler.setInputAction(function(movement){ // tooltip.style.left = movement.endPosition.x + 3 + "px"; // tooltip.style.top = movement.endPosition.y - 25 + "px"; // tooltip.innerHTML ='
单击开始，右击结束
'; // cartesian = viewer.scene.pickPosition(movement.endPosition); let ray = viewer.camera.getPickRay(movement.endPosition); cartesian = viewer.scene.globe.pick(ray, viewer.scene); //cartesian = viewer.scene.camera.pickEllipsoid(movement.endPosition, viewer.scene.globe.ellipsoid); if(positions.length >= 2){ if (!Cesium.defined(polygon)) { polygon = new PolygonPrimitive(positions); }else{ positions.pop(); // cartesian.y += (1 + Math.random()); positions.push(cartesian); } // tooltip.innerHTML='
'+distance+'米
'; } },Cesium.ScreenSpaceEventType.MOUSE_MOVE); handler.setInputAction(function(movement){ // tooltip.style.display = "none"; // cartesian = viewer.scene.pickPosition(movement.position); let ray = viewer.camera.getPickRay(movement.position); cartesian = viewer.scene.globe.pick(ray, viewer.scene); // cartesian = viewer.scene.camera.pickEllipsoid(movement.position, viewer.scene.globe.ellipsoid); if(positions.length == 0) { positions.push(cartesian.clone()); } //positions.pop(); positions.push(cartesian); //在三维场景中添加点 var cartographic = Cesium.Cartographic.fromCartesian(positions[positions.length - 1]); var longitudeString = Cesium.Math.toDegrees(cartographic.longitude); var latitudeString = Cesium.Math.toDegrees(cartographic.latitude); var heightString = cartographic.height; tempPoints.push({ lon: longitudeString, lat: latitudeString ,hei:heightString}); floatingPoint = viewer.entities.add({ name : '多边形面积', position : positions[positions.length - 1], point : { pixelSize : 5, color : Cesium.Color.RED, outlineColor : Cesium.Color.WHITE, outlineWidth : 2, heightReference:Cesium.HeightReference.CLAMP_TO_GROUND } }); },Cesium.ScreenSpaceEventType.LEFT_CLICK); handler.setInputAction(function(movement){ handler.destroy(); positions.pop(); //tempPoints.pop(); // viewer.entities.remove(floatingPoint); // tooltip.style.display = "none"; //在三维场景中添加点 // var cartographic = Cesium.Cartographic.fromCartesian(positions[positions.length - 1]); // var longitudeString = Cesium.Math.toDegrees(cartographic.longitude); // var latitudeString = Cesium.Math.toDegrees(cartographic.latitude); // var heightString = cartographic.height; // tempPoints.push({ lon: longitudeString, lat: latitudeString ,hei:heightString}); var textArea = getArea(tempPoints) + "平方公里"; viewer.entities.add({ name : '多边形面积', position : positions[positions.length - 1], // point : { // pixelSize : 5, // color : Cesium.Color.RED, // outlineColor : Cesium.Color.WHITE, // outlineWidth : 2, // heightReference:Cesium.HeightReference.CLAMP_TO_GROUND // }, label : { text : textArea, font : '18px sans-serif', fillColor : Cesium.Color.GOLD, style: Cesium.LabelStyle.FILL_AND_OUTLINE, outlineWidth : 2, verticalOrigin : Cesium.VerticalOrigin.BOTTOM,