From 3b26ba4e86f897507117152dd7cb0d5bc9e8d840 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Enrique=20Lo=CC=81pez=20Man=CC=83as?=
 <eenriquelopez@gmail.com>
Date: Mon, 27 Nov 2023 08:57:49 +0100
Subject: [PATCH] docs: showcase usage of custom algorithm

---
 .../android/compose/MarkerClusteringActivity.kt    | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/app/src/main/java/com/google/maps/android/compose/MarkerClusteringActivity.kt b/app/src/main/java/com/google/maps/android/compose/MarkerClusteringActivity.kt
index 28068b79a..d7bfe60a2 100644
--- a/app/src/main/java/com/google/maps/android/compose/MarkerClusteringActivity.kt
+++ b/app/src/main/java/com/google/maps/android/compose/MarkerClusteringActivity.kt
@@ -31,6 +31,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
@@ -38,6 +39,7 @@ import androidx.compose.ui.unit.sp
 import com.google.android.gms.maps.model.CameraPosition
 import com.google.android.gms.maps.model.LatLng
 import com.google.maps.android.clustering.ClusterItem
+import com.google.maps.android.clustering.algo.NonHierarchicalViewBasedAlgorithm
 import com.google.maps.android.compose.clustering.Clustering
 import com.google.maps.android.compose.clustering.rememberClusterManager
 import com.google.maps.android.compose.clustering.rememberClusterRenderer
@@ -171,7 +173,19 @@ private fun CustomUiClustering(items: List<MyItem>) {
 @OptIn(MapsComposeExperimentalApi::class)
 @Composable
 fun CustomRendererClustering(items: List<MyItem>) {
+    val configuration = LocalConfiguration.current
+    val screenHeight = configuration.screenHeightDp.dp
+    val screenWidth = configuration.screenWidthDp.dp
     val clusterManager = rememberClusterManager<MyItem>()
+
+    // Here the clusterManager is being customized with a NonHierarchicalViewBasedAlgorithm.
+    // This speeds up by a factor the rendering of items on the screen.
+    clusterManager?.setAlgorithm(
+        NonHierarchicalViewBasedAlgorithm(
+            screenHeight.value.toInt(),
+            screenWidth.value.toInt()
+        )
+    )
     val renderer = rememberClusterRenderer(
         clusterContent = { cluster ->
             CircleContent(