fix(ol-heatmap-layer): handle property updates correctly

use a shallow ref and watch deep

Author: d-koppenhagen

Diff for: src/components/layers/OlHeatmapLayer.vue

@@ -5,7 +5,14 @@
 </template>
 
 <script setup lang="ts">
-import { inject, provide, onUnmounted, onMounted, watch, computed } from "vue";
+import {
+  inject,
+  provide,
+  onUnmounted,
+  onMounted,
+  watch,
+  shallowRef,
+} from "vue";
 import HeatmapLayer from "ol/layer/Heatmap";
 import type { Extent } from "ol/extent";
 import type Map from "ol/Map";
@@ -41,12 +48,20 @@ const map = inject<Map>("map");
 const layerGroup = inject<LayerGroup | null>("layerGroup", null);
 
 const { properties } = usePropsAsObjectProperties(props);
-const heatmapLayer = computed(() => new HeatmapLayer(properties));
+const heatmapLayer = shallowRef(new HeatmapLayer(properties));
 
-watch(properties, () => {
-  heatmapLayer.value.setProperties(properties);
-  map?.changed();
-});
+watch(
+  () => properties,
+  (newValue) => {
+    for (const key in newValue) {
+      const keyInObj = key as keyof typeof newValue;
+      if (newValue[keyInObj]) {
+        heatmapLayer.value.set(key, newValue[keyInObj]);
+      }
+    }
+  },
+  { deep: true },
+);
 
 onMounted(() => {
   map?.addLayer(heatmapLayer.value);

Diff for: src/demos/HeatmapLayerDemo.vue

@@ -1,4 +1,31 @@
 <template>
+  <form>
+    <fieldset>
+      <label for="blur">Blur</label>
+      <input
+        type="range"
+        id="blur"
+        min="0"
+        max="100"
+        step="1"
+        v-model.number="blur"
+      />
+      <span class="description">{{ blur }}</span>
+    </fieldset>
+    <fieldset>
+      <label for="radius">Radius</label>
+      <input
+        type="range"
+        id="radius"
+        min="0"
+        max="100"
+        step="1"
+        v-model.number="radius"
+      />
+      <span class="description">{{ radius }}</span>
+    </fieldset>
+  </form>
+
   <ol-map
     ref="map"
     :loadTilesWhileAnimating="true"
@@ -18,8 +45,8 @@
 
     <ol-heatmap-layer
       title="heatmap"
-      :blur="20"
-      :radius="20"
+      :blur="blur"
+      :radius="radius"
       :weight="heatmapWeight"
       :zIndex="1"
     >
@@ -39,6 +66,8 @@ import { ref, inject } from "vue";
 const center = ref([101.97, 4.21]);
 const projection = ref("EPSG:4326");
 const zoom = ref(5);
+const blur = ref(20);
+const radius = ref(20);
 const format = inject("ol-format");
 const kml = new format.KML({ extractStyles: false });
 const heatmapWeight = function (feature) {