3 files changed, 30 insertions, 26 deletions
diff --git a/src/map.cpp b/src/map.cpp
index 8e85e6ee..05dea951 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -98,16 +98,14 @@ Map::initializeOverlays()
         const std::string name = "overlay" + toString(i);
 
         Image *img = resman->getImage(getProperty(name + "image"));
-        float scrollX = getFloatProperty(name + "scrollX");
-        //float scrollY = getFloatProperty(name + "scrollY");
+        float speedX = getFloatProperty(name + "scrollX");
+        float speedY = getFloatProperty(name + "scrollY");
         float parallax = getFloatProperty(name + "parallax");
 
         if (img)
         {
-            // TODO: For some reason scrollX is passed as speedX and speedY.
-            //       Maybe Crush knows why?
             mOverlays.push_back(
-                    new AmbientOverlay(img, parallax, 0, 0, scrollX, scrollX));
+                    new AmbientOverlay(img, parallax, speedX, speedY));
 
             // The AmbientOverlay takes control over the image.
             img->decRef();
diff --git a/src/resources/ambientoverlay.cpp b/src/resources/ambientoverlay.cpp
index b5304627..058b6083 100644
--- a/src/resources/ambientoverlay.cpp
+++ b/src/resources/ambientoverlay.cpp
@@ -28,9 +28,9 @@
 #include "../graphics.h"
 
 AmbientOverlay::AmbientOverlay(Image *img, float parallax,
-        float scrollX, float scrollY, float speedX, float speedY):
+                               float speedX, float speedY):
     mImage(img), mParallax(parallax),
-    mScrollX(scrollX), mScrollY(scrollY),
+    mPosX(0), mPosY(0),
     mSpeedX(speedX), mSpeedY(speedY)
 {
     mImage->incRef();
@@ -44,30 +44,30 @@ AmbientOverlay::~AmbientOverlay()
 void AmbientOverlay::update(int timePassed, float dx, float dy)
 {
     // Self scrolling of the overlay
-    mScrollX -= mSpeedX * timePassed / 10;
-    mScrollY -= mSpeedY * timePassed / 10;
+    mPosX -= mSpeedX * timePassed / 10;
+    mPosY -= mSpeedY * timePassed / 10;
 
     // Parallax scrolling
-    mScrollX += dx * mParallax;
-    mScrollY += dy * mParallax;
+    mPosX += dx * mParallax;
+    mPosY += dy * mParallax;
 
     int imgW = mImage->getWidth();
     int imgH = mImage->getHeight();
 
     // Wrap values
-    while (mScrollX > imgW)
-        mScrollX -= imgW;
-    while (mScrollX < 0)
-        mScrollX += imgW;
+    while (mPosX > imgW)
+        mPosX -= imgW;
+    while (mPosX < 0)
+        mPosX += imgW;
 
-    while (mScrollY > imgH)
-        mScrollY -= imgH;
-    while (mScrollY < 0)
-        mScrollY += imgH;
+    while (mPosY > imgH)
+        mPosY -= imgH;
+    while (mPosY < 0)
+        mPosY += imgH;
 }
 
 void AmbientOverlay::draw(Graphics *graphics, int x, int y)
 {
-    graphics->drawImagePattern(mImage, (int)(-mScrollX), (int)(-mScrollY),
-            x + (int)mScrollX, y + (int)mScrollY);
+    graphics->drawImagePattern(mImage,
+            (int) -mPosX, (int) -mPosY, x + (int) mPosX, y + (int) mPosY);
 }
diff --git a/src/resources/ambientoverlay.h b/src/resources/ambientoverlay.h
index 25bc28ef..a939cbb4 100644
--- a/src/resources/ambientoverlay.h
+++ b/src/resources/ambientoverlay.h
@@ -30,9 +30,15 @@ class Image;
 class AmbientOverlay
 {
     public:
+        /**
+         * Constructor.
+         */
         AmbientOverlay(Image *img, float parallax,
-                float scrollX, float scrollY, float speedX, float speedY);
+                       float speedX, float speedY);
 
+        /**
+         * Destructor.
+         */
         ~AmbientOverlay();
 
         void update(int timePassed, float dx, float dy);
@@ -42,10 +48,10 @@ class AmbientOverlay
     private:
         Image *mImage;
         float mParallax;
-        float mScrollX;
-        float mScrollY;
-        float mSpeedX;
-        float mSpeedY;
+        float mPosX;              /**< Current layer X position. */
+        float mPosY;              /**< Current layer Y position. */
+        float mSpeedX;            /**< Scroll speed in X direction. */
+        float mSpeedY;            /**< Scroll speed in Y direction. */
 };
 
 #endif