cesium精确定位初始化视角

cesium三维WebGL应用开发过程中需要精确定位初始化场景位置时,可采用以下思路
首先粗略定位场景位置,参见https://www.jianshu.com/p/7736e0cf97d1
其次鼠标移动场景到最佳视角,假设该视角就是需要精确定位的视角。
然后让鼠标左键单击场景时输出6个视角参数到控制台,把这6个参数反填会代码里即可。

回顾一下视角设置代码,如下

viewer.scene.camera.setView({
            destination: new Cesium.Cartesian3(-1206939.1925299785, 5337998.241228442, 3286279.2424502545),
            orientation: {
                heading: 1.4059101895600987,
                pitch: -0.20917672793046682,
                roll: 2.708944180085382e-13
            }
        });

1.输出6个视角参数到控制台的关键代码

 //获取相机视角
        var handler1 = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
        handler1.setInputAction(function (movement) {
            console.log(viewer.scene.camera.position.x + "," + viewer.scene.camera.position.y + "," + viewer.scene.camera.position.z);//相机XYZ
            console.log("换行输出:"+"\n"+
                            "heading:" + viewer.scene.camera.heading + ","+"\n"+
                            "pitch:" + viewer.scene.camera.pitch + ","+"\n"+
                            "roll:" + viewer.scene.camera.roll
            );
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

2.左键单击输出6个视角参数到控制台的完整代码(可运行)

该代码基于SuperMap版cesium框架,可在SuperMap的在线沙箱运行。点击以下示例中的源码按钮,把本文下面的代码全部复制到沙箱里覆盖,点击运行,F12观察浏览器控制台,已输出6个对应的参数。
http://support.supermap.com.cn:8090/webgl/examples/editor.html#terrainAndImagery

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
    <meta name="viewport"
          content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <title>地形影像</title>
    <link href="../Build/Cesium/Widgets/widgets.css" rel="stylesheet">
    <link href="./css/pretty.css" rel="stylesheet">
    <script src="./js/jquery.min.js"></script>
    <script src="./js/spectrum.js"></script>
    <script type="text/javascript" src="./js/require.min.js" data-main="js/main"></script>
    <script src="./js/config.js"></script>
</head>
<body>
<div id="cesiumContainer"></div>
<div id='loadingbar' class="spinner">
    <div class="spinner-container container1">
        <div class="circle1"></div>
        <div class="circle2"></div>
        <div class="circle3"></div>
        <div class="circle4"></div>
    </div>
    <div class="spinner-container container2">
        <div class="circle1"></div>
        <div class="circle2"></div>
        <div class="circle3"></div>
        <div class="circle4"></div>
    </div>
    <div class="spinner-container container3">
        <div class="circle1"></div>
        <div class="circle2"></div>
        <div class="circle3"></div>
        <div class="circle4"></div>
    </div>
</div>

<script>
    function onload(Cesium) {
        var viewer = new Cesium.Viewer('cesiumContainer', {
            //创建地形服务提供者的实例,url为SuperMap iServer发布的TIN地形服务
            terrainProvider: new Cesium.CesiumTerrainProvider({
                url: URL_CONFIG.SiChuan_TERRAIN,
                isSct: true//地形服务源自SuperMap iServer发布时需设置isSct为true
            }),
        });
        //添加SuperMap iServer发布的影像服务
        var layer = viewer.imageryLayers.addImageryProvider(new Cesium.SuperMapImageryProvider({
            url: URL_CONFIG.SiChuan_IMG
        }));

        viewer.scene.camera.setView({
            destination: new Cesium.Cartesian3(-1206939.1925299785, 5337998.241228442, 3286279.2424502545),
            orientation: {
                heading: 1.4059101895600987,
                pitch: -0.20917672793046682,
                roll: 2.708944180085382e-13
            }
        });

        $('#loadingbar').remove();
        $('#toolbar').show();

        //获取相机视角
        var handler1 = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
        handler1.setInputAction(function (movement) {
            console.log(viewer.scene.camera.position.x + "," + viewer.scene.camera.position.y + "," + viewer.scene.camera.position.z);//相机XYZ
            console.log("换行输出:"+"\n"+
                            "heading:" + viewer.scene.camera.heading + ","+"\n"+
                            "pitch:" + viewer.scene.camera.pitch + ","+"\n"+
                            "roll:" + viewer.scene.camera.roll
            );
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
    }
</script>
</body>
</html>
image.png

如果需要点击某一按钮div切换到特定视角,也可以通过该种方法获取地物的最佳视角,然后把视角参数写到视角切换函数中。

转载自:https://www.jianshu.com/p/87d0404f0866

You may also like...