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cesium-定位方法

闲云困兽 2022-01-08 阅读 138
前端javascriptcesiumWebGIS天地图

cesium-定位方法

视图定位-定位到点

<!DOCTYPE html>
<html lang="en">
<head>
    <!-- Use correct character set. -->
    <meta charset="utf-8"/>
    <!-- Tell IE to use the latest, best version. -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
    <meta name="viewport"
          content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"/>
    <title>cesium定位方法</title>
    <script src="../lib/Cesium-1.89/Build/Cesium/Cesium.js"></script>
    <style>
        @import url(../lib/Cesium-1.89/Build/Cesium/Widgets/widgets.css);

        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        #cesiumContainer {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>
<div style="display: -webkit-flex;display: flex;width: 100%;height: 100%">
    <div style="width: 90%;height: 100%">
        <div id="cesiumContainer"></div>
    </div>
    <div style="width: 10%;height: 100%;background-color: #d3d3d3;padding: 30px">
        <button onclick="viewerFlyToLonLat(110.0, 35.8, 500)">视图定位-定位到点</button>
    </div>
</div>
<script>
    //天地图token
    let TDT_tk = "token";
    //Cesium token
    let cesium_tk = "cesium token";
    //天地图影像
    let TDT_IMG_C = "http://{s}.tianditu.gov.cn/img_c/wmts?service=wmts&request=GetTile&version=1.0.0" +
        "&LAYER=img&tileMatrixSet=c&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}" +
        "&style=default&format=tiles&tk=" + TDT_tk;

    //标注
    let TDT_CIA_C = "http://{s}.tianditu.gov.cn/cia_c/wmts?service=wmts&request=GetTile&version=1.0.0" +
        "&LAYER=cia&tileMatrixSet=c&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}" +
        "&style=default&format=tiles&tk=" + TDT_tk;


    //初始页面加载
    Cesium.Ion.defaultAccessToken = cesium_tk;
    let viewer = new Cesium.Viewer('cesiumContainer', {
        geocoder: false,   // 位置查找工具
        baseLayerPicker: false,// 图层选择器（地形影像服务）
        timeline: false, // 底部时间线
        homeButton: false,// 视角返回初始位置
        fullscreenButton: false, // 全屏
        animation: false,   // 左下角仪表盘（动画器件）
        sceneModePicker: false,// 选择视角的模式（球体、平铺、斜视平铺）
        navigationHelpButton: false, //导航帮助按钮
        // infoBox: false,//信息框控件
        // navigationInstructionsInitiallyVisible: false, //导航说明初始可见
        // shouldAnimate: false, //动画
        // requestWaterMask: false, //请求水面罩
        // requestVertexNormals: false, //请求顶点法线
        imageryProvider: new Cesium.WebMapTileServiceImageryProvider({
            url: TDT_IMG_C,
            layer: "tdtImg_c",
            style: "default",
            format: "tiles",
            tileMatrixSetID: "c",
            subdomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
            tilingScheme: new Cesium.GeographicTilingScheme(),
            tileMatrixLabels: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19"],
            maximumLevel: 50,
            show: false
        })
    });

    //调用影响中文注记服务
    viewer.imageryLayers.addImageryProvider(new Cesium.WebMapTileServiceImageryProvider({
        url: TDT_CIA_C,
        layer: "tdtImg_c",
        style: "default",
        format: "tiles",
        tileMatrixSetID: "c",
        subdomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
        tilingScheme: new Cesium.GeographicTilingScheme(),
        tileMatrixLabels: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19"],
        maximumLevel: 50,
        show: false
    }));
    // 去除版权信息
    viewer._cesiumWidget._creditContainer.style.display = "none";

    let entity = null;

    /**
     * 视图定位方法，定位到点
     * @param lon 经度
     * @param lat 纬度
     * @param alt 范围（相机距离中心点的位置为5000）
     */
    function viewerFlyToLonLat(lon, lat, alt) {
        if (entity)
            viewer.entities.remove(entity);
        entity = new Cesium.Entity({
            id: 'flyTmp',
            position: Cesium.Cartesian3.fromDegrees(lon, lat),
            point: {
                pixelSize: 10,
                color: Cesium.Color.WHITE.withAlpha(0.9),
                outlineColor: Cesium.Color.WHITE.withAlpha(0.9),
                outlineWidth: 1
            }
        });
        viewer.entities.add(entity);
        viewer.flyTo(entity, {
            offset: {
                heading: Cesium.Math.toRadians(0.0), //默认方向为正北，正角度为向东旋转，即水平选装，也叫偏航角
                pitch: Cesium.Math.toRadians(-50), // 俯仰角
                range: alt
            }
        });
    }


</script>

</body>
</html>

image-20220108150703334

相机定位-定位到点

    /**
     * 相机定位方法，定位到点
     * @param lon 经度
     * @param lat 纬度
     * @param alt 范围（相机距离中心点的位置为5000）
     */
    function cameraFlyToLonLat(lon, lat, alt) {
        viewer.camera.flyTo({
            destination: Cesium.Cartesian3.fromDegrees(lon, lat, alt),
            orientation: {
                heading: Cesium.Math.toRadians(0.0),
                pitch: Cesium.Math.toRadians(-25.0),
                roll: 0.0
            }
        });
    }

image-20220108151211457

视图定位-定位到范围

    /**
     * 视图定位方法，定位到范围
     * @param rect 范围数组（最西、最南、最东、最北）
     */
    function viewerFlyToRange(rect) {
        if (locationRectEntity)
            viewer.entities.remove(locationRectEntity);
        locationRectEntity = viewer.entities.add({
            name: 'locationRectangle',
            id: 'locationRectangle',
            rectangle: {
                coordinates: Cesium.Rectangle.fromDegrees(rect[0], rect[1], rect[2], rect[3]),
                material: Cesium.Color.GREEN.withAlpha(1.0),
                height: 10.0,
                outline: false
            }
        });
        let flyPromise = viewer.flyTo(locationRectEntity, {
            duration: 5,
            offset: new Cesium.HeadingPitchRange(0.0, Cesium.Math.toRadians(-20.0))
        });
    }

image-20220108151455167

相机定位-定位到范围

    /**
     * 相机定位方法，定位到范围
     * @param rect 范围数组（最西、最南、最东、最北）
     */
    function cameraFlyToRange(rect) {
        viewer.camera.flyTo({
            destination: Cesium.Rectangle.fromDegrees(rect[0], rect[1], rect[2], rect[3]),
            duration: 5,
            orientation: {
                heading: Cesium.Math.toRadians(0.0),
                pitch: Cesium.Math.toRadians(-25.0),
                roll: 0.0
            }
        });
    }

image-20220108151515707

视图定位-定位到范围-计算中心

    /**
     * 视图定位方法，定位到范围，并重新计算距离
     * @param rect
     */
    function viewerFlyToRangeAndCenter(rect) {
        if (locationRectEntity)
            viewer.entities.remove(locationRectEntity);
        locationRectEntity = viewer.entities.add({
            name: 'locationRectangle',
            id: 'locationRectangle',
            rectangle: {
                coordinates: Cesium.Rectangle.fromDegrees(rect[0], rect[1], rect[2], rect[3]),
                material: Cesium.Color.GREEN.withAlpha(1.0),
                height: 10.0,
                outline: false
            }
        });
        let flyPromise = viewer.flyTo(locationRectEntity, {
            duration: 5,
            offset: new Cesium.HeadingPitchRange(0.0, Cesium.Math.toRadians(-20.0))
        });

        //倾斜后记录相机到矩形中心点的距离，然后再根据倾斜角度，计算新的距离，
        // 再viewer.flyto的完成后，再通过中心点离相机的距离，使用zoomTo来拉近一下距离
        flyPromise.then(function () {
            let center = Cesium.Rectangle.center(Cesium.Rectangle.fromDegrees(rect[0], rect[1], rect[2], rect[3]));
            let car = Cesium.Cartesian3.fromRadians(center.longitude, center.latitude);
            let range = Cesium.Cartesian3.distance(car, viewer.camera.position) * Math.cos(20);
            viewer.zoomTo(locationRectEntity, new Cesium.HeadingPitchRange(0.0, Cesium.Math.toRadians(-20.0), range));
        });
    }
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