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CesiumJS+SuperMap3D.js混用实现可视域分析 S3M图层加载 裁剪区域绘制

2024/10/24 22:23:42 来源：https://blog.csdn.net/weixin_51983847/article/details/142140218  浏览:  次   关键词：CesiumJS+SuperMap3D.js混用实现可视域分析 S3M图层加载 裁剪区域绘制

版本简介：

cesium：1.99；Supermap3D：SuperMap iClient JavaScript 11i(2023)；

官方下载文档链家：SuperMap技术资源中心|为您提供全面的在线技术服务

示例参考：support.supermap.com.cn:8090/webgl/Cesium/examples/webgl/examples.html#analysis

support.supermap.com.cn:8090/webgl/examples/webgl/examples.html

Cesium：场景初始化、渲染、Bing地图、S3M图层加载。

SuperMap3D：可视域分析、S3M图层加载、裁剪区域绘制、Knockout绑定等功能。

两者结合：Cesium 提供基础渲染和事件处理，SuperMap3D 提供高级的功能实现。

1. Cesium 部分

场景初始化与配置
Cesium.Ion.defaultAccessToken = '...';
var viewer = new Cesium.Viewer('Container', {selectionIndicator: false,infoBox: false,terrainProvider: Cesium.createWorldTerrain()
});
viewer.resolutionScale = window.devicePixelRatio;
  • 这段代码是使用 Cesium 进行场景渲染的部分。Cesium.Ion.defaultAccessToken 用于访问 Cesium Ion 服务，viewer 是 Cesium Viewer 的实例，它用于创建一个可视化容器，其中指定了Container元素来渲染场景。createWorldTerrain() 设置了全球地形服务，resolutionScale 提高了分辨率，以适应高DPI屏幕。
添加Bing地图图层
viewer.imageryLayers.addImageryProvider(new Cesium.BingMapsImageryProvider({url: 'https://dev.virtualearth.net',mapStyle: Cesium.BingMapsStyle.AERIAL,key: URL_CONFIG.BING_MAP_KEY
}));
  • 这里是Cesium的图层管理部分，使用 BingMapsImageryProvider 添加了 Bing 地图的航拍图层。Cesium 的图层管理方式主要通过 imageryLayers.addImageryProvider() 实现。
事件处理与视口操作
var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
handler.setInputAction(function (e) {//...
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
  • 这一部分代码处理的是 Cesium 中的鼠标事件，如屏幕空间事件(ScreenSpaceEventHandler) 和鼠标移动事件 (MOUSE_MOVE)。这是 Cesium 的交互控制，通过捕捉鼠标操作来对场景进行更新。

2. SuperMap3D 部分

可视域分析与裁剪
var viewshed3D = new SuperMap3D.ViewShed3D(scene);
  • 这里是 SuperMap3D 提供的可视域分析功能的初始化。SuperMap3D.ViewShed3D 是用于在 3D 场景中执行可视域分析的类，用于计算某个点是否可见。
加载S3M图层
var promise = scene.open('http://www.supermapol.com/realspace/services/3D-CBD-2/rest/realspace');
SuperMap3D.when(promise, function (layers) {// 设置相机位置等操作
}, function (e) {// 错误处理
});
  • 这里通过 scene.open() 加载了 SuperMap3D 的 S3M 图层，这个图层是 SuperMap 提供的特定格式，通常用于大规模3D场景的渲染和展示。
裁剪区域操作
var handlerPolygon = new SuperMap3D.DrawHandler(viewer, SuperMap3D.DrawMode.Polygon, 0); 
handlerPolygon.movingEvt.addEventListener(function (windowPosition) {if (handlerPolygon.isDrawing) {tooltip.showAt(windowPosition, '<p>绘制相交区域(右键结束绘制)</p>'); // 绘制提示}
});
handlerPolygon.drawEvt.addEventListener(function (result) {var array = [].concat(result.object.positions);var positions = [];for (var i = 0, len = array.length; i < len; i++) {var cartographic = SuperMap3D.Cartographic.fromCartesian(array[i]);var longitude = SuperMap3D.Math.toDegrees(cartographic.longitude);var latitude = SuperMap3D.Math.toDegrees(cartographic.latitude);var h = cartographic.height;positions.push(longitude, latitude, h);}viewshed3D.addClipRegion({name: 'test', position: positions}); // 添加裁剪区域
});
  • 这是 SuperMap3D 的裁剪操作部分。通过 SuperMap3D.DrawHandler 绘制多边形区域，viewshed3D.addClipRegion() 函数则用于将绘制的区域应用到可视域分析对象中，进行裁剪。
  • DrawHandler 用于激活绘制多边形裁剪面的功能。
  • movingEvt 事件在绘制过程中显示提示信息。
  • drawEvt 事件在绘制完成时获取多边形的坐标，并将其设置为可视域的裁剪区域。
Knockout 绑定
SuperMap3D.knockout.track(viewModel);
SuperMap3D.knockout.applyBindings(viewModel, toolbar);
  • 这段代码是使用 SuperMap3D 提供的 Knockout 绑定功能，目的是将数据模型 viewModel 与 UI 绑定。这个功能允许动态更新可视域分析的参数。

3. Cesium 和 SuperMap3D 的结合

Cesium 在整个代码中主要负责场景渲染、基础交互和图层的管理，如初始化 Viewer、处理鼠标事件、添加图层等。而 SuperMap3D 负责具体的功能实现，比如可视域分析、S3M 图层加载、裁剪操作等。

两者通过 viewer.scene 来共享场景，SuperMap3D 的功能在 Cesium 的场景之上实现。例如：

  • var viewshed3D = new SuperMap3D.ViewShed3D(scene); —— 这里的 scene 是 Cesium 场景，而 viewshed3D 是 SuperMap3D 的可视域对象，它依赖于 Cesium 的场景。
  • 加载S3M图层和添加裁剪区域也是在 Cesium 场景中进行操作，二者配合使用

 4.完整代码展示

<!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>可视域分析</title><link href="../../public/SuperMap3D/Widgets/widgets.css" rel="stylesheet"><link rel="stylesheet" href="./css/font-awesome.min.css"><link href="../css/pretty.css" rel="stylesheet"><link href="../css/style.css" rel="stylesheet"><link href="../css/viewshed3D.css" rel="stylesheet"><script type="text/javascript" src="../js/jquery.min.js"></script><script src="../js/slider.js"></script><script src="../js/config.js"></script><script src="../js/tooltip.js"></script><script src="../js/spectrum.js"></script><script type="text/javascript" src="../../public/SuperMap3D/SuperMap3D.js"></script><script src="../../../Cesium-1.99/Build/Cesium/Cesium.js"></script><link href="../../../Cesium-1.99/Build/Cesium/Widgets/widgets.css">
</head><body>
<div id="Container"></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>
<div id="toolbar" class="param-container tool-bar"><button type="button" id="chooseView" class="button black">绘制可视域</button><button type="button" id="cilpRegion" class="button black">绘制裁剪面</button><button type="button" id="clear" class="button black">清除</button><div class="param-item"><b>裁剪模式：</b><select id="clip-mode" class="supermap3d-button"><option value="keep-inside">保留区域内</option><option value="keep-outside">保留区域外</option></select></div>
</div><div id="wrapper" style="display:none"><div id="login" class="animate form"><span class="close" aria-hidden="true">×</span><form><h1>属性编辑</h1><p><div><label>方向(度)</label><input type="range" id="direction" min="0" max="360" step="1.0" title="方向"data-bind="value: direction, valueUpdate: 'input'"><input type="text" size="5" data-bind="value: direction"></div><div><label>翻转(度)</label><input type="range" id="pitch" min="-90" max="90" step="1.0" value="1" title="翻转"data-bind="value: pitch, valueUpdate: 'input'"><input type="text" size="5" data-bind="value: pitch"></div><div><label>距离(米)</label><input type="range" id="distance" min="1" max="500" step="1.0" value="1" title="距离"data-bind="value: distance, valueUpdate: 'input'"><input type="text" size="5" data-bind="value: distance"></div><div><label>水平视场角(度)</label><input type="range" id="horizonalFov" min="1" max="120" step="1" value="1" title="水平视场角"data-bind="value: horizontalFov, valueUpdate: 'input'"><input type="text" size="5" data-bind="value: horizontalFov"></div><div><label>垂直视场角(度)</label><input type="range" id="verticalFov" min="1" max="90" step="1.0" value="1" title="垂直视场角"data-bind="value: verticalFov, valueUpdate: 'input'"><input type="text" size="5" data-bind="value: verticalFov"></div></p><p><div class="square square-left"><label>可见区域颜色</label><input class="colorPicker" data-bind="value: visibleAreaColor,valueUpdate: 'input'"id="colorPicker1"/></div><div class="square square-right"><label>不可见区域颜色</label><input class="colorPicker"data-bind="value: invisibleAreaColor,valueUpdate: 'input'"id="colorPicker2"/></div></p><br/><br/><p><label>本例中观察者附加高度：1.8 米</label></p></form></div>
</div><script type="text/javascript">function onload(Cesium) {Cesium.Ion.defaultAccessToken = 'your token'var viewer = new Cesium.Viewer('Container', {selectionIndicator: false,infoBox: false,terrainProvider: Cesium.createWorldTerrain()});viewer.resolutionScale = window.devicePixelRatio;viewer.scenePromise.then(function(scene){init(Cesium, scene, viewer);});}function init(Cesium, scene, viewer) {var labelImagery = new Cesium.TiandituImageryProvider({mapStyle: Cesium.TiandituMapsStyle.CIA_C,//天地图全球中文注记服务token: 'your token' //由天地图官网申请的密钥});var scene = viewer.scene;scene.lightSource.ambientLightColor = new Cesium.Color(0.65, 0.65, 0.65, 1);var viewPosition;if (!scene.pickPositionSupported) {alert('不支持深度纹理,可视域分析功能无法使用（无法添加观测）！');}// 先将此标记置为true，不激活鼠标移动事件中对可视域分析对象的操作scene.viewFlag = true;var pointHandler = new Cesium.DrawHandler(viewer, Cesium.DrawMode.Point);// 创建可视域分析对象var viewshed3D = new SuperMap3D.ViewShed3D(scene);var colorStr1 = viewshed3D.visibleAreaColor.toCssColorString();var colorStr2 = viewshed3D.hiddenAreaColor.toCssColorString();var widget = viewer.Widget;try {//添加S3M图层var promise = scene.open('http://www.supermapol.com/realspace/services/3D-CBD-2/rest/realspace');SuperMap3D.when(promise, function (layers) {// 图层加载完成,设置相机位置scene.camera.setView({destination: SuperMap3D.Cartesian3.fromDegrees(116.44366835831197, 39.907137217792666, 48.237028126511696),orientation: {heading: 1.6310555040487564,pitch: 0.0017367269669030794,roll: 3.007372129104624e-12}});for (var i = 0; i < layers.length; i++) {layers[i].selectEnabled = false;}}, function (e) {if (widget._showRenderLoopErrors) {var title = '加载SCP失败，请检查网络连接状态或者url地址是否正确？';widget.showErrorPanel(title, undefined, e);}});} catch (e) {if (widget._showRenderLoopErrors) {var title = '渲染时发生错误，已停止渲染。';widget.showErrorPanel(title, undefined, e);}}var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);// 鼠标移动时间回调handler.setInputAction(function (e) {// 若此标记为false，则激活对可视域分析对象的操作if (!scene.viewFlag) {//获取鼠标屏幕坐标,并将其转化成笛卡尔坐标var windowPosition = e.endPosition;scene.pickPositionAsync(windowPosition).then((last)=>{//计算该点与视口位置点坐标的距离var distance = SuperMap3D.Cartesian3.distance(viewPosition, last);if (distance > 0) {// 将鼠标当前点坐标转化成经纬度var cartographic = Cesium.Cartographic.fromCartesian(last);var longitude = Cesium.Math.toDegrees(cartographic.longitude);var latitude = Cesium.Math.toDegrees(cartographic.latitude);var height = cartographic.height;// 通过该点设置可视域分析对象的距离及方向viewshed3D.setDistDirByPoint([longitude, latitude, height]);}})}}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);handler.setInputAction(function (e) {//鼠标右键事件回调，不再执行鼠标移动事件中对可视域的操作scene.viewFlag = true;$("#wrapper").show();viewModel.direction = viewshed3D.direction;viewModel.pitch = viewshed3D.pitch;viewModel.distance = viewshed3D.distance;viewModel.horizontalFov = viewshed3D.horizontalFov;viewModel.verticalFov = viewshed3D.verticalFov;}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);var tooltip = createTooltip(document.body);//绘制裁剪面var handlerPolygon = new SuperMap3D.DrawHandler(viewer, SuperMap3D.DrawMode.Polygon, 0);handlerPolygon.activeEvt.addEventListener(function (isActive) {if (isActive == true) {viewer.enableCursorStyle = false;viewer._element.style.cursor = '';$('body').removeClass('drawCur').addClass('drawCur');} else {viewer.enableCursorStyle = true;$('body').removeClass('drawCur');}});handlerPolygon.movingEvt.addEventListener(function (windowPosition) {if (handlerPolygon.isDrawing) {tooltip.showAt(windowPosition, '<p>绘制相交区域(右键结束绘制)</p>');}});handlerPolygon.drawEvt.addEventListener(function (result) {tooltip.setVisible(false);var array = [].concat(result.object.positions);var positions = [];for (var i = 0, len = array.length; i < len; i++) {var cartographic = SuperMap3D.Cartographic.fromCartesian(array[i]);var longitude = SuperMap3D.Math.toDegrees(cartographic.longitude);var latitude = SuperMap3D.Math.toDegrees(cartographic.latitude);var h = cartographic.height;if (positions.indexOf(longitude) == -1 && positions.indexOf(latitude) == -1) {positions.push(longitude);positions.push(latitude);positions.push(h);}}handlerPolygon.polygon.show = false;handlerPolygon.polyline.show = false;viewshed3D.addClipRegion({name: 'test', position: positions});handlerPolygon.deactivate();});pointHandler.drawEvt.addEventListener(function (result) {// var point = result.object;var position = result.object.position;viewPosition = position;// 将获取的点的位置转化成经纬度var cartographic = Cesium.Cartographic.fromCartesian(position);var longitude = Cesium.Math.toDegrees(cartographic.longitude);var latitude = Cesium.Math.toDegrees(cartographic.latitude);var height = cartographic.height + 1.8;// point.position = SuperMap3D.Cartesian3.fromDegrees(longitude, latitude, height);if (scene.viewFlag) {// 设置视口位置viewshed3D.viewPosition = [longitude, latitude, height];viewshed3D.build();// 将标记置为false以激活鼠标移动回调里面的设置可视域操作scene.viewFlag = false;}});var viewModel = {direction: 1.0,pitch: 1.0,distance: 1.0,verticalFov: 1.0,horizontalFov: 1.0,visibleAreaColor: '#ffffffff',invisibleAreaColor: '#ffffffff'};SuperMap3D.knockout.track(viewModel);var toolbar = document.getElementById('wrapper');SuperMap3D.knockout.applyBindings(viewModel, toolbar);SuperMap3D.knockout.getObservable(viewModel, 'direction').subscribe(function (newValue) {if(viewshed3D.direction !== parseFloat(newValue)){viewshed3D.direction = parseFloat(newValue);viewshed3D.removeClipRegion('test');}});SuperMap3D.knockout.getObservable(viewModel, 'pitch').subscribe(function (newValue) {if(viewshed3D.pitch !== parseFloat(newValue)){viewshed3D.pitch = parseFloat(newValue);viewshed3D.removeClipRegion('test');}});SuperMap3D.knockout.getObservable(viewModel, 'distance').subscribe(function (newValue) {if(viewshed3D.distance !== parseFloat(newValue)){viewshed3D.distance = parseFloat(newValue);viewshed3D.removeClipRegion('test');}});SuperMap3D.knockout.getObservable(viewModel, 'verticalFov').subscribe(function (newValue) {if(viewshed3D.verticalFov !== parseFloat(newValue)){viewshed3D.verticalFov = parseFloat(newValue);viewshed3D.removeClipRegion('test');}});SuperMap3D.knockout.getObservable(viewModel, 'horizontalFov').subscribe(function (newValue) {if(viewshed3D.horizontalFov !== parseFloat(newValue)){viewshed3D.horizontalFov = parseFloat(newValue);viewshed3D.removeClipRegion('test');}});SuperMap3D.knockout.getObservable(viewModel, 'visibleAreaColor').subscribe(function (newValue) {var color = SuperMap3D.Color.fromCssColorString(newValue);viewshed3D.visibleAreaColor = color;});SuperMap3D.knockout.getObservable(viewModel, 'invisibleAreaColor').subscribe(function (newValue) {var color = SuperMap3D.Color.fromCssColorString(newValue);viewshed3D.hiddenAreaColor = color;});$("#colorPicker1").spectrum({color: colorStr1,showPalette: true,showAlpha: true,localStorageKey: "spectrum.demo",preferredFormat:'rgb'});$('#colorPicker2').spectrum({color: colorStr2,showPalette: true,showAlpha: true,localStorageKey: "spectrum.demo",preferredFormat:'rgb'});$(".close").click(function () {$("#wrapper").hide();});$("#chooseView").click(function (e) {if (pointHandler.active) {return;}//先清除之前的可视域分析// viewer.entities.removeAll();viewshed3D.distance = 0.1;scene.viewFlag = true;//激活绘制点类pointHandler.activate();});$("#clip-mode").on("input propertychange", function () {clipMode = $(this).val() === 'keep-inside' ? SuperMap3D.ClippingType.KeepInside : SuperMap3D.ClippingType.KeepOutside;viewshed3D.setClipMode(clipMode);});$("#cilpRegion").click(function (e) {handlerPolygon.deactivate();handlerPolygon.activate();});$("#clear").on("click", function () {viewshed3D.removeAllClipRegion();// 清除观察点pointHandler.clear()$("#wrapper").hide();viewshed3D.distance = 0.1;scene.viewFlag = true;})$('#loadingbar').remove();$("#toolbar").show();}if (typeof SuperMap3D !== 'undefined') {window.startupCalled = true;onload(SuperMap3D);}
</script>
</body></html>

注意替换Cesium.Ion.defaultAccessToken，以及天地图官网申请的密钥 

5.效果展示：

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