Cesium fragmented knowledge points (a): mouse click listener position and coordinate transformation

// 鼠标点击监听位置
function initPosition(){
	var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
	handler.setInputAction(function (movement) {
		// 屏幕坐标（二维坐标）
		var twoSpace = movement.position;
		console.log("屏幕坐标（二维坐标）", twoSpace);
		
		// 二维坐标转世界坐标
		var worldSpace  = viewer.scene.camera.pickEllipsoid(movement.position, viewer.scene.globe.ellipsoid);
		console.log("二维坐标——》世界坐标", worldSpace);
		
		// 世界坐标转地理坐标（弧度）
		var geographySpace = viewer.scene.globe.ellipsoid.cartesianToCartographic(worldSpace);
		console.log("世界坐标——》地理坐标（弧度）", geographySpace);
		var geographySpace = Cesium.Cartographic.fromCartesian(worldSpace);
		console.log("世界坐标——》地理坐标（弧度）", geographySpace);
		
		// 世界坐标转屏幕坐标
		var twoSpace = Cesium.SceneTransforms.wgs84ToWindowCoordinates(viewer.scene, worldSpace);
		console.log("世界坐标——》屏幕坐标", twoSpace);

		// 二维屏幕坐标系到三维坐标系的转换
		var threeSpace = viewer.scene.globe.pick(viewer.camera.getPickRay(twoSpace), viewer.scene);
		console.log("二维坐标——》三维坐标", threeSpace);

		// 三维坐标到地理坐标的转换
		var geographySpace = viewer.scene.globe.ellipsoid.cartesianToCartographic(threeSpace);
		console.log("三维坐标——》地标坐标（弧度）", geographySpace);
		var geographySpace = Cesium.Cartographic.fromCartesian(threeSpace)
		console.log("三维坐标——》地标坐标（弧度）", geographySpace);
		 
		// 地理坐标到经纬度坐标的转换
		var longitudeAndLatitude = [geographySpace.longitude / Math.PI * 180, geographySpace.latitude / Math.PI * 180, geographySpace.height];
		console.log("地标坐标（弧度）——》经纬度坐标", longitudeAndLatitude);
		var longitude = Cesium.Math.toDegrees(geographySpace.longitude);
		var latitude = Cesium.Math.toDegrees(geographySpace.latitude);
		var height = geographySpace.height;
		console.log("地标坐标（弧度）——》经纬度坐标：经度",longitude,"| 纬度",latitude,"| 高度",height);
		console.log("地标坐标（弧度）——》经纬度坐标：经度",longitude.toFixed(3),"| 纬度",latitude.toFixed(3),"| 高度",height.toFixed(1));
		
		// 经纬度坐标转地理坐标（弧度）
		var geographySpace = Cesium.Cartographic.fromDegrees(longitude, latitude, height);//单位：度，度，米
		console.log("经纬度坐标——》地理坐标（弧度）", geographySpace);
		 
		// 经纬度坐标转世界坐标（先转换成弧度再转换）
		var geographySpace = Cesium.Cartographic.fromDegrees(longitude, latitude, height);
		var worldSpace = viewer.scene.globe.ellipsoid.cartographicToCartesian(geographySpace);
		console.log("经纬度坐标——》世界坐标", worldSpace);
		
		// 经纬度转三维坐标
		var threeSpace = Cesium.Cartesian3.fromDegrees(longitude, latitude, height);
		console.log("经纬度坐标——》三维坐标", threeSpace);  
	}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
}