From 29b1f0d55d6449fda35ed561b4ea1bb339ce5fb5 Mon Sep 17 00:00:00 2001
From: geonux <gaudissart@gmail.com>
Date: Mon, 6 Jul 2015 12:11:34 +0200
Subject: [PATCH 1/4] Add the capability to remove(undo) the last drawed
 segments.

---
 src/ol/interaction/drawinteraction.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index beb7d1b273..7c1729feb4 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -617,6 +617,31 @@ ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
 };
 
 
+/**
+ * Remove last drawed point of the currently edited feature.
+ * @api
+ */
+ol.interaction.Draw.prototype.removeLastPoint = function() {
+  var geometry = this.sketchFeature_.getGeometry();
+  var coordinates, sketchLineGeom;
+  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
+    coordinates = this.sketchCoords_;
+    coordinates.splice(-2, 1);
+    this.geometryFunction_(coordinates, geometry);
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    coordinates = this.sketchCoords_[0];
+    coordinates.splice(-2, 1);
+    sketchLineGeom = this.sketchLine_.getGeometry();
+    sketchLineGeom.setCoordinates(coordinates);
+    this.geometryFunction_(this.sketchCoords_, geometry);
+  }
+
+  if (coordinates.length === 0) this.finishCoordinate_ = null;
+
+  this.updateSketchFeatures_();
+};
+
+
 /**
  * Stop drawing and add the sketch feature to the target layer.
  * The {@link ol.interaction.DrawEventType.DRAWEND} event is dispatched before

From 314b04df7ab29cd68d34fba66289427d3f18bc81 Mon Sep 17 00:00:00 2001
From: geonux <gaudissart@gmail.com>
Date: Mon, 6 Jul 2015 13:49:42 +0200
Subject: [PATCH 2/4] Add assertions to pass the validation step.

---
 src/ol/interaction/drawinteraction.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index 7c1729feb4..7b9c950664 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -623,6 +623,8 @@ ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
  */
 ol.interaction.Draw.prototype.removeLastPoint = function() {
   var geometry = this.sketchFeature_.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry must be an ol.geom.SimpleGeometry');
   var coordinates, sketchLineGeom;
   if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
     coordinates = this.sketchCoords_;
@@ -632,6 +634,8 @@ ol.interaction.Draw.prototype.removeLastPoint = function() {
     coordinates = this.sketchCoords_[0];
     coordinates.splice(-2, 1);
     sketchLineGeom = this.sketchLine_.getGeometry();
+    goog.asserts.assertInstanceof(sketchLineGeom, ol.geom.LineString,
+        'sketchLineGeom must be an ol.geom.LineString');
     sketchLineGeom.setCoordinates(coordinates);
     this.geometryFunction_(this.sketchCoords_, geometry);
   }

From 64ab764827c74589848588b3c25eb26c73c5a9b1 Mon Sep 17 00:00:00 2001
From: geonux <gaudissart@gmail.com>
Date: Mon, 6 Jul 2015 15:07:56 +0200
Subject: [PATCH 3/4] Renaming the method description according to 'probins'
 proposal.

---
 src/ol/interaction/drawinteraction.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index 7b9c950664..0bb01627f4 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -618,7 +618,7 @@ ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
 
 
 /**
- * Remove last drawed point of the currently edited feature.
+ * Remove last point of the feature currently being drawn.
  * @api
  */
 ol.interaction.Draw.prototype.removeLastPoint = function() {

From 999880f350773c5cf7c388a6fbe145288b1a4b3d Mon Sep 17 00:00:00 2001
From: geonux <gaudissart@gmail.com>
Date: Tue, 4 Aug 2015 15:02:49 +0200
Subject: [PATCH 4/4] Add missing braces on statement

---
 src/ol/interaction/drawinteraction.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index 0bb01627f4..e7147b2457 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -640,7 +640,9 @@ ol.interaction.Draw.prototype.removeLastPoint = function() {
     this.geometryFunction_(this.sketchCoords_, geometry);
   }
 
-  if (coordinates.length === 0) this.finishCoordinate_ = null;
+  if (coordinates.length === 0) {
+    this.finishCoordinate_ = null;
+  }
 
   this.updateSketchFeatures_();
 };