From af8a22d34d66a3567e243a8fa47969e923cfa0c5 Mon Sep 17 00:00:00 2001
From: Frederic Junod <frederic.junod@camptocamp.com>
Date: Tue, 22 Jan 2019 12:47:34 +0100
Subject: [PATCH] Keep two digits for the opacity value in layer state

---
 src/ol/layer/Base.js             | 2 +-
 src/ol/layer/Layer.js            | 2 +-
 test/spec/ol/layer/layer.test.js | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/ol/layer/Base.js b/src/ol/layer/Base.js
index e601b7a3a7..0921af2c2b 100644
--- a/src/ol/layer/Base.js
+++ b/src/ol/layer/Base.js
@@ -91,7 +91,7 @@ class BaseLayer extends BaseObject {
       layer: this,
       managed: true
     });
-    state.opacity = clamp(this.getOpacity(), 0, 1);
+    state.opacity = clamp(Math.round(this.getOpacity() * 100) / 100, 0, 1);
     state.sourceState = this.getSourceState();
     state.visible = this.getVisible();
     state.extent = this.getExtent();
diff --git a/src/ol/layer/Layer.js b/src/ol/layer/Layer.js
index d735a4eeef..fccecf809e 100644
--- a/src/ol/layer/Layer.js
+++ b/src/ol/layer/Layer.js
@@ -35,7 +35,7 @@ import SourceState from '../source/State.js';
 /**
  * @typedef {Object} State
  * @property {import("./Base.js").default} layer
- * @property {number} opacity
+ * @property {number} opacity Opacity, the value is rounded to two digits to appear after the decimal point.
  * @property {SourceState} sourceState
  * @property {boolean} visible
  * @property {boolean} managed
diff --git a/test/spec/ol/layer/layer.test.js b/test/spec/ol/layer/layer.test.js
index e077455ac1..dba518a47a 100644
--- a/test/spec/ol/layer/layer.test.js
+++ b/test/spec/ol/layer/layer.test.js
@@ -162,14 +162,14 @@ describe('ol.layer.Layer', function() {
     });
 
     it('returns a layerState from the properties values', function() {
-      layer.setOpacity(0.3);
+      layer.setOpacity(1 / 3);
       layer.setVisible(false);
       layer.setMaxResolution(500);
       layer.setMinResolution(0.25);
       layer.setZIndex(10);
       expect(layer.getLayerState()).to.eql({
         layer: layer,
-        opacity: 0.3,
+        opacity: 0.33,
         visible: false,
         managed: true,
         sourceState: 'ready',