add the GroundPrimitiveLayer

modules/layer/Layer.js

@@ -17,6 +17,7 @@ class Layer {
     this._viewer = undefined
     this._state = undefined
     this._show = true
+    this._isGround = false
     this._cache = {}
     this._attr = {}
     this._layerEvent = new LayerEvent()
@@ -85,7 +86,11 @@ class Layer {
       return
     }
     if (this._delegate instanceof Cesium.PrimitiveCollection) {
-      this._viewer.scene.primitives.add(this._delegate)
+      if (this._isGround) {
+        this._viewer.scene.groundPrimitives.add(this._delegate)
+      } else {
+        this._viewer.scene.primitives.add(this._delegate)
+      }
     } else {
       this._viewer.dataSources.add(this._delegate)
     }
@@ -106,7 +111,11 @@ class Layer {
       this._cache = {}
       if (this._delegate instanceof Cesium.PrimitiveCollection) {
         this._delegate.removeAll()
-        this._viewer.scene.primitives.remove(this._delegate)
+        if (this._isGround) {
+          this._viewer.scene.groundPrimitives.remove(this._delegate)
+        } else {
+          this._viewer.scene.primitives.remove(this._delegate)
+        }
       } else if (this._delegate.then) {
         this._delegate.then(dataSource => {
           dataSource.entities.removeAll()

modules/layer/type/GroundPrimitiveLayer.js

@@ -0,0 +1,36 @@
+/**
+ * @Author: Caven
+ * @Date: 2021-12-03 20:12:59
+ */
+
+import { Cesium } from '@dc-modules/namespace'
+import State from '@dc-modules/state/State'
+import Layer from '../Layer'
+
+class GroundPrimitiveLayer extends Layer {
+  constructor(id) {
+    super(id)
+    this._delegate = new Cesium.PrimitiveCollection()
+    this._isGround = true
+    this._state = State.INITIALIZED
+  }
+
+  get type() {
+    return Layer.getLayerType('ground_primitive')
+  }
+
+  /**
+   *
+   * @return {GroundPrimitiveLayer}
+   */
+  clear() {
+    this._delegate && this._delegate.removeAll()
+    this._cache = {}
+    this._state = State.CLEARED
+    return this
+  }
+}
+
+Layer.registerType('ground_primitive')
+
+export default GroundPrimitiveLayer