cesium 局部加载_Cesium（四）常用代码总结
1、陰影效果
viewer.shadows = true;
2、取消左鍵雙擊事件
viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
3、定位飛到某處
viewer.scene.camera.flyTo({ destination: rectangle });
4、開啟燈光
scene.globe.enableLighting = true;
5、限制縮放距離
scene.screenSpaceCameraController.minimumZoomDistance = 100;
6、解決Cesium繪制幾何圖形被高程遮擋問題
viewer.scene.globe.depthTestAgainstTerrain = true;
7、point貼地
var point = viewer.entities.add({
position: worldPosition,
point: {
pixelSize: 10,
color: Cesium.Color.YELLOW,
//控制是否貼地
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
},
});
8、地球移動(dòng)事件
camera.moveStart.addEventListener(function() {
});
camera.moveEnd.addEventListener(function() {
});
9、取消Cesium版權(quán)信息
$(".cesium-widget-credits").remove();
10、自定義BaseLayerPicker
var esriMap = new Cesium.ArcGisMapServerImageryProvider({
url:'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',
enablePickFeatures:false
});
//設(shè)置ProviderViewModel：
var esriMapModel = new Cesium.ProviderViewModel({
name:'esri Maps',
iconUrl:Cesium.buildModuleUrl('./Widgets/Images/ImageryProviders/esriWorldImagery.png'),
tooltip:'ArcGIS 地圖服務(wù)',
creationFunction:function () {
return esriMap;
}
});
//只有一個(gè)
var providerViewModels = [];
providerViewModels.push(esriMapModel);
viewer.baseLayerPicker.viewModel.imageryProviderViewModels = providerViewModels;
11、設(shè)置時(shí)間
// 設(shè)置時(shí)鐘和時(shí)間線
viewer.clock.shouldAnimate = true; // 當(dāng)viewer開啟后，啟動(dòng)動(dòng)畫
viewer.clock.startTime = Cesium.JulianDate.fromIso8601("2017-07-11T16:00:00Z");
viewer.clock.stopTime = Cesium.JulianDate.fromIso8601("2017-07-11T16:20:00Z");
viewer.clock.currentTime = Cesium.JulianDate.fromIso8601("2017-07-11T16:00:00Z");
viewer.clock.multiplier = 2; // 設(shè)置加速倍率
viewer.clock.clockStep = Cesium.ClockStep.SYSTEM_CLOCK_MULTIPLIER; // tick computation mode(還沒理解具體含義)
viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP; // 循環(huán)播放
viewer.timeline.zoomTo(viewer.clock.startTime, viewer.clock.stopTime); // 設(shè)置時(shí)間的可見范圍
12、拾取
/**
* 返回對(duì)應(yīng)窗口位置最上面一個(gè)Entity 如果該位置沒有對(duì)象那么返回undefined
* @param {Cartesian2} windowPosition 窗口坐標(biāo)
* @returns {Entity} 返回值
*/
function pickEntity(viewer, windowPosition) {
var picked = viewer.scene.pick(windowPosition);
if (defined(picked)) {
var id = Cesium.defaultValue(picked.id, picked.primitive.id);
if (id instanceof Cesium.Entity) {
return id;
}
}
return undefined;
};
/**
*返回對(duì)應(yīng)窗口位置所有Entity的列表 如果該位置沒有對(duì)象那么返回undefined
* 返回值按可視化順序從前到后存儲(chǔ)在數(shù)組里
*
* @param {Cartesian2} windowPosition 窗口位置
* @returns {Entity[]}
*/
function drillPickEntities(viewer, windowPosition) {
var i;
var entity;
var picked;
var pickedPrimitives = viewer.scene.drillPick(windowPosition);
var length = pickedPrimitives.length;
var result = [];
var hash = {};
for (i = 0; i < length; i++) {
picked = pickedPrimitives[i];
entity = Cesium.defaultValue(picked.id, picked.primitive.id);
if (entity instanceof Cesium.Entity &&
!Cesium.defined(hash[entity.id])) {
result.push(entity);
hash[entity.id] = true;
}
}
return result;
};
該代碼出自：https://www.jianshu.com/p/8ae3624347cb
13、檢測(cè)深度
//為false時(shí)，沒有高程遮擋效果
viewer.scene.globe.depthTestAgainstTerrain = false;
//為true時(shí)，有高程遮擋效果
viewer.scene.globe.depthTestAgainstTerrain = true;
14、加載geoserver的WMS服務(wù)
var provider = new Cesium.WebMapServiceImageryProvider({
url: 'http://localhost:8080/geoserver/cite/wms',
layers: 'cite:city',
parameters: {
service : 'WMS',
format: 'image/png',
transparent: true,
}
});
viewer.imageryLayers.addImageryProvider(provider);
15、自定義credit
var viewer = new Cesium.Viewer('cesiumContainer');
var credit = new Cesium.Credit('Title', '../images/facility.gif', 'http://www.cesiumjs.org');
viewer.scene.frameState.creditDisplay.addDefaultCredit(credit)
16、拾取
Scene.pick : 返回窗口坐標(biāo)對(duì)應(yīng)的圖元的第一個(gè)對(duì)象。
Scene.drillPick :返回窗口坐標(biāo)對(duì)應(yīng)的所有對(duì)象列表。
Globe.pick : 返回一條射線和地形的相交位置點(diǎn)。
17、禁止縮放
viewer.scene.screenSpaceCameraController.enableZoom = false;
18、控制時(shí)鐘暫停與繼續(xù)
pauseOrContinue (state) {
this.viewer.clock.shouldAnimate = state
}
19、繞點(diǎn)飛行
var viewer = new Cesium.Viewer('cesiumContainer');
var options = {
lng: 117.1423291616,
lat: 39.0645831633,
height: 15.8,
heading: 0.0,
pitch: 0.0,
roll: 0.0
};
var position = Cesium.Cartesian3.fromDegrees(options.lng, options.lat, options.height);
// 相機(jī)看點(diǎn)的角度，如果大于0那么則是從地底往上看，所以要為負(fù)值，這里取-30度
var pitch = Cesium.Math.toRadians(-30);
// 給定飛行一周所需時(shí)間，比如10s, 那么每秒轉(zhuǎn)動(dòng)度數(shù)
var angle = 360 / 30;
// 給定相機(jī)距離點(diǎn)多少距離飛行，這里取值為5000m
var distance = 5000;
var startTime = Cesium.JulianDate.fromDate(new Date());
// var stopTime = Cesium.JulianDate.addSeconds(startTime, 10, new Cesium.JulianDate());
viewer.clock.startTime = startTime.clone(); // 開始時(shí)間
// viewer.clock.stopTime = stopTime.clone(); // 結(jié)速時(shí)間
viewer.clock.currentTime = startTime.clone(); // 當(dāng)前時(shí)間
viewer.clock.clockRange = Cesium.ClockRange.CLAMPED; // 行為方式
viewer.clock.clockStep = Cesium.ClockStep.SYSTEM_CLOCK; // 時(shí)鐘設(shè)置為當(dāng)前系統(tǒng)時(shí)間; 忽略所有其他設(shè)置。
// 相機(jī)的當(dāng)前heading
var initialHeading = viewer.camera.heading;
var Exection = function TimeExecution() {
// 當(dāng)前已經(jīng)過去的時(shí)間，單位s
var delTime = Cesium.JulianDate.secondsDifference(viewer.clock.currentTime, viewer.clock.startTime);
var heading = Cesium.Math.toRadians(delTime * angle) + initialHeading;
viewer.scene.camera.setView({
destination :position, // 點(diǎn)的坐標(biāo)
orientation:{
heading: heading,
pitch : pitch,
}
});
viewer.scene.camera.moveBackward(distance);
if (Cesium.JulianDate.compare(viewer.clock.currentTime, viewer.clock.stopTime) >= 0) {
viewer.clock.onTick.removeEventListener(Exection);
}
};
20、只讓地球顯示一塊區(qū)域，其余裁剪
var coffeeBeltRectangle = Cesium.Rectangle.fromDegrees(-180.0, -23.43687, 180.0, 23.43687);
viewer.scene.globe.cartographicLimitRectangle = coffeeBeltRectangle;
21、關(guān)閉HDR
viewer.scene.highDynamicRange = false;
22、防止進(jìn)入地下
23、billboard顯示不完整怎么解決？
24、gltf模型雙面渲染
doubleSided改為true
25、開啟debugShowFramesPerSecond
scene.debugShowFramesPerSecond = true;
26、監(jiān)聽entity選擇改變代碼示例
var lastSelectedPin;
viewer.selectedEntityChanged.addEventListener(function(newEntity) {
if (lastSelectedPin && lastSelectedPin.billboard) {
lastSelectedPin.billboard.show = false;
}
lastSelectedPin = newEntity;
if (lastSelectedPin && lastSelectedPin.billboard) {
lastSelectedPin.billboard.show = true;
}
});
27、局部坐標(biāo)系
//以點(diǎn)為原點(diǎn)建立局部坐標(biāo)系(東方向?yàn)閤軸,北方向?yàn)閥軸,垂直于地面為z軸)，得到一個(gè)局部坐標(biāo)到世界坐標(biāo)轉(zhuǎn)換的變換矩陣
var localToWorld_Matrix = Cesium.Transforms.eastNorthUpToFixedFrame(position);
28、顯示與隱藏cesium的控件
viewer.homeButton.container.childNodes[1].style.display = "none"
29、判斷是否在可視范圍內(nèi)
var cullingVolume = frameState.cullingVolume;
var boundingVolume = defaultValue(surfaceTile.orientedBoundingBox, surfaceTile.boundingSphere3D);
var intersection = cullingVolume.computeVisibility(boundingVolume);
30、計(jì)算一個(gè)圖元的法向量
var geometry = GeometryPipeline.computeNormal(new Geometry({
attributes: attributes,
indices: indices,
primitiveType: PrimitiveType.TRIANGLES,
boundingSphere: boundingSphere
}));
31、圖元生成線框形式
var instance = new Cesium.GeometryInstance({
geometry : Cesium.GeometryPipeline.toWireframe(new Cesium.TetrahedronGeometry()),
modelMatrix : modelMatrix,
attributes : {
color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.WHITE)
}
});
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