From 0043e39ee3ce99773f8e79edf06e1dd19e521c1a Mon Sep 17 00:00:00 2001
From: Frederic Junod <frederic.junod@camptocamp.com>
Date: Thu, 27 Mar 2014 08:56:38 +0100
Subject: [PATCH] Clamp opacity value to (0, 1)

---
 src/ol/layer/heatmaplayer.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ol/layer/heatmaplayer.js b/src/ol/layer/heatmaplayer.js
index 8440b426a0..37f6752b2b 100644
--- a/src/ol/layer/heatmaplayer.js
+++ b/src/ol/layer/heatmaplayer.js
@@ -4,6 +4,7 @@ goog.require('goog.asserts');
 goog.require('goog.dom');
 goog.require('goog.dom.TagName');
 goog.require('goog.events');
+goog.require('goog.math');
 goog.require('ol.Object');
 goog.require('ol.layer.Vector');
 goog.require('ol.render.EventType');
@@ -68,7 +69,7 @@ ol.layer.Heatmap = function(opt_options) {
 
   this.setStyle(function(feature, resolution) {
     var weight = weightFunction(feature);
-    var opacity = goog.isDef(weight) ? weight : 1;
+    var opacity = goog.math.clamp(goog.isDef(weight) ? weight : 1, 0, 1);
     // cast to 8 bits
     var index = (255 * opacity) | 0;
     var style = styleCache[index];