Cesium 常规设置

1.  初始化viewer对象

//创建cesium Viewerviewer = new Cesium.Viewer(‘cesiumContainer’,{animation:false, //是否创建动画小器件，左下角仪表baseLayerPicker:false, //是否显示图层选择器fullscreenButton:false, //是否显示全屏按钮geocoder:false, //是否显示geocoder小器件，右上角查询按钮homeButton:false, //是否显示Home按钮infoBox : false, //是否显示信息框sceneModePicker:false, //是否显示3D/2D选择器selectionIndicator : false , //是否显示选取指示器组件timeline:false, //是否显示时间轴sceneMode:Cesium.SceneMode.COLUMBUS_VIEW,//设定3维地图的默认场景模式:Cesium.SceneMode.SCENE2D、Cesium.SceneMode.SCENE3D、Cesium.SceneMode.MORPHING navigationHelpButton:false, //是否显示右上角的帮助按钮scene3DOnly : true, //如果设置为true，则所有几何图形以3D模式绘制以节约GPU资源navigationInstructionsInitiallyVisible:false,showRenderLoopErrors:false,imageryProvider : new Cesium.OpenStreetMapImageryProvider({ url : ‘//a.tile.openstreetmap.org/’ }) //加载自定义地图瓦片需要指定一个自定义图片服务器//URL 为瓦片数据服务器地址 });

 2.  对entity的操作：添加、隐藏、修改、去除、居中显示

Var rainEntity=viewer.entities.add({ id: "rain", name: 'RainStation', parent: rainLayer3D, position: Cesium.Cartesian3.fromDegrees(lon, lat), billboard: { image: 'images/pointIcons/rain1.png', scale:0.7, verticalOrigin: Cesium.VerticalOrigin.BOTTOM }, label: { text: rainfall, font: '12px SimHei ', Width: 3, style: Cesium.LabelStyle.FILL, fillColor: Cesium.Color.AQUA, horizontalOrigin: Cesium.HorizontalOrigin.CENTER, verticalOrigin: Cesium.VerticalOrigin.TOP } }); //添加viewer.entities.getById("rain").show = false; //隐藏viewer.entities.getById("rain").label.text= "drp"; //修改属性viewer.entities.removeAll(); //移除所有viewer.zoomTo(rainEntity); //居中显示

 3.  去掉entity的双击事件

问题所在：双击entity，会放大视图，entity居中显示，且鼠标左键失去移动功能，鼠标滚轮失去作用解决问题：viewer.screenSpaceEventHandler.setInputAction(function(){},Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK );

 4. 获取当前视角高度

var scene = viewer.scene;var ellipsoid = scene.globe.ellipsoid;var height=ellipsoid.cartesianToCartographic(viewer.camera.position).height;

5. 获取某个经纬度在屏幕上的位置

var position = Cesium.Cartesian3.fromDegrees(lon, lat);var clickPt =Cesium.SceneTransforms.wgs84ToWindowCoordinates (viewer.scene, position);var screenX=clickPt.x;var screenY=clickPt.y;

6. 获取三维场景屏幕中心点坐标

var result = viewer.camera.pickEllipsoid(new Cesium.Cartesian2 ( viewer.canvas.clientWidth /2 , viewer.canvas.clientHeight / 2));var curPosition = Cesium.Ellipsoid.WGS84.cartesianToCartographic(result);var lon = curPosition.longitude*180/Math.PI;var lat = curPosition.latitude*180/Math.PI;

 7. 响应鼠标单击等事件，获取屏幕点击坐标

var handler = new Cesium.ScreenSpaceEventHandler(canvas); handler.setInputAction(function(click){},Cesium.ScreenSpaceEventType.LEFT_CLICK); var clickX=click.position.x; var clickY=click.position.y;这个LEFT_CLICK可以换成MIDDLE_CLICK、MOUSE_MOVE等就会响应滚轮点击、鼠标移动等事件，见参考文档中的ScreenSpaceEventType()，注意不同的事件中，function中的click会有不同的属性，可console.log(click)，找到所需

 8.  跟踪相机视角的改变

viewer.camera.moveStart.addEventListener(function(moveStartPosition){})；viewer.camera.moveEnd.addEventListener(function(moveEndPosition){})；

 9. 使视角到达某一地点

viewer.camera.setView({ destination: Cesium.Cartesian3.fromDegrees(lon, lat, height), orientation: { heading : curHeading, //左右偏移 pitch : curPitch, //上下偏移 roll : 0.0 } });