ImageryLayerCollection

成员 Members

默认值： Default Value: Event()

默认值： Default Value: Event()

默认值： Default Value: Event()

默认值： Default Value: Event()

方法 Methods

抛出： Throws:

• DeveloperError ：索引（如果提供）必须大于或等于零且小于或等于层数。 : index, if supplied, must be greater than or equal to zero and less than or equal to the number of the layers.

示例： Examples:

const imageryLayer = Cesium.ImageryLayer.fromWorldImagery();
scene.imageryLayers.add(imageryLayer);

const imageryLayer = Cesium.ImageryLayer.fromProviderAsync(Cesium.IonImageryProvider.fromAssetId(3812));
scene.imageryLayers.add(imageryLayer);

返回： Returns:

示例： Example:

try {
   const provider = await Cesium.IonImageryProvider.fromAssetId(3812);
   scene.imageryLayers.addImageryProvider(provider);
} catch (error) {
  console.log(`There was an error creating the imagery layer. ${error}`)
}

返回： Returns:

抛出： Throws:

• DeveloperError : This object was destroyed, i.e., destroy() was called.

示例： Example:

layerCollection = layerCollection && layerCollection.destroy();

另见： See:

• ImageryLayerCollection#isDestroyed

返回： Returns:

返回： Returns:

返回： Returns:

另见： See:

• ImageryLayerCollection#destroy

抛出： Throws:

• DeveloperError : layer is not in this collection.
• DeveloperError : This object was destroyed, i.e., destroy() was called.

抛出： Throws:

• DeveloperError : layer is not in this collection.
• DeveloperError : This object was destroyed, i.e., destroy() was called.

返回： Returns:

示例： Example:

const pickRay = viewer.camera.getPickRay(windowPosition);
const featuresPromise = viewer.imageryLayers.pickImageryLayerFeatures(pickRay, viewer.scene);
if (!Cesium.defined(featuresPromise)) {
    console.log('No features picked.');
} else {
    Promise.resolve(featuresPromise).then(function(features) {
        // This function is called asynchronously when the list if picked features is available.
        console.log(`Number of features: ${features.length}`);
        if (features.length > 0) {
            console.log(`First feature name: ${features[0].name}`);
        }
    });
}

返回： Returns:

抛出： Throws:

• DeveloperError : layer is not in this collection.
• DeveloperError : This object was destroyed, i.e., destroy() was called.

抛出： Throws:

• DeveloperError : layer is not in this collection.
• DeveloperError : This object was destroyed, i.e., destroy() was called.

返回： Returns: