From 80b4473180034ad43ceb7612aff20815ba251855 Mon Sep 17 00:00:00 2001
From: Olivier Guyot <olivier.guyot@camptocamp.com>
Date: Mon, 28 Oct 2019 10:27:26 +0100
Subject: [PATCH] Simplify the heatmap example

Use a weight function instead of manually edditing the features.
---
 examples/heatmap-earthquakes.js | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/examples/heatmap-earthquakes.js b/examples/heatmap-earthquakes.js
index 05d28aeb31..93256ab1a8 100644
--- a/examples/heatmap-earthquakes.js
+++ b/examples/heatmap-earthquakes.js
@@ -16,16 +16,15 @@ const vector = new HeatmapLayer({
     })
   }),
   blur: parseInt(blur.value, 10),
-  radius: parseInt(radius.value, 10)
-});
-
-vector.getSource().on('addfeature', function(event) {
-  // 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
-  // standards-violating <magnitude> tag in each Placemark.  We extract it from
-  // the Placemark's name instead.
-  const name = event.feature.get('name');
-  const magnitude = parseFloat(name.substr(2));
-  event.feature.set('weight', magnitude - 5);
+  radius: parseInt(radius.value, 10),
+  weight: function(feature) {
+    // 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
+    // standards-violating <magnitude> tag in each Placemark.  We extract it from
+    // the Placemark's name instead.
+    const name = feature.get('name');
+    const magnitude = parseFloat(name.substr(2));
+    return magnitude - 5;
+  }
 });
 
 const raster = new TileLayer({
@@ -34,7 +33,7 @@ const raster = new TileLayer({
   })
 });
 
-const map = new Map({
+new Map({
   layers: [raster, vector],
   target: 'map',
   view: new View({