Globe类提供了removeAllExcavationRegion方法，可移除开挖面（这里还可以通过选用removeAllExtractRegion方法实现地形抽出显示效果）。
注意地形开挖与地形修改的区别
地形开挖 |
|
| |
地形修改 |
|
|
<!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>地形开挖</title>
<link href="../Build/Cesium/Widgets/widgets.css" rel="stylesheet">
<link href="./css/pretty.css" rel="stylesheet">
<script type="text/javascript" src="./js/jquery.min.js"></script>
<script src="./js/tooltip.js"></script>
<script src="./js/config.js"></script>
<script type="text/javascript" src="./js/require.min.js" data-main="js/main"></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>
<div id="toolbar" class="param-container tool-bar">
<div class="param-item">
<label class="form-label">开挖深度(米) :</label>
<input id="depth" type="number" value="500" required="required" style="width:90px;"/>
</div>
<div class="param-item">
<button type="button" id="clear" style="float:right;" class="button black">清除</button>
</div>
</div>
<script type="text/javascript">
function onload(Cesium) {
//初始化viewer部件，添加STK World Terrain地形服务
var viewer = new Cesium.Viewer('cesiumContainer',{
terrainProvider : new Cesium.CesiumTerrainProvider({
url : URL_CONFIG.STK,
requestWaterMask : true,
requestVertexNormals : true
})
});
viewer.imageryLayers.addImageryProvider(new Cesium.BingMapsImageryProvider({
url : 'https://dev.virtualearth.net',
mapStyle : Cesium.BingMapsStyle.AERIAL,
key : URL_CONFIG.BING_MAP_KEY
}));
var scene = viewer.scene;
// 设置相机视角
viewer.scene.camera.setView({
destination : Cesium.Cartesian3.fromDegrees(88.3648, 29.0946, 90000),
orientation : {
heading : 6.10547067016156,
pitch : -0.8475077031996778,
roll :6.2831853016686185
}
});
var tooltip = createTooltip(viewer._element);
//绘制多边形
var handlerPolygon = new Cesium.DrawHandler(viewer,Cesium.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(windowPosition.x < 200 && windowPosition.y < 150){
tooltip.setVisible(false);
return ;
}
if(handlerPolygon.isDrawing){
tooltip.showAt(windowPosition,'<p>点击确定开挖区域中间点</p><p>右键单击结束绘制,进行开挖</p>');
}
else{
tooltip.showAt(windowPosition,'<p>点击绘制开挖区域第一个点</p>');
}
});
handlerPolygon.drawEvt.addEventListener(function(result){
if(!result.object.positions){
tooltip.showAt(result,'<p>请绘制正确的多边形</p>');
handlerPolygon.polygon.show = false;
handlerPolygon.polyline.show = false;
handlerPolygon.deactivate();
handlerPolygon.activate();
return;
};
var array = [].concat(result.object.positions);
tooltip.setVisible(false);
var positions = [];
for(var i = 0, len = array.length; i < len; i ++){
var cartographic = Cesium.Cartographic.fromCartesian(array[i]);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.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);
}
}
var dep = $('#depth').val();
viewer.scene.globe.removeAllExcavationRegion();
//地形开挖
viewer.scene.globe.addExcavationRegion({
name : 'ggg' ,
position : positions,
height : dep,
transparent : false
});
handlerPolygon.polygon.show = false;
handlerPolygon.polyline.show = false;
handlerPolygon.deactivate();
handlerPolygon.activate();
});
handlerPolygon.activate();
document.getElementById("clear").onclick = function() {
viewer.scene.globe.removeAllExcavationRegion();
handlerPolygon.polygon.show=false;
handlerPolygon.polyline.show=false;
};
if(!scene.pickPositionSupported){
alert('不支持深度纹理,无法绘制多边形，地形开挖功能无法使用！');
}
$('#toolbar').show();
$('#loadingbar').remove();
}
</script>
</body>
</html>
地形开挖
地形修改
