Turned AmbientOverlay into a class. Cleaned up the associated code.

1 files changed, 73 insertions, 0 deletions

diff --git a/src/resources/ambientoverlay.cpp b/src/resources/ambientoverlay.cpp
new file mode 100644
index 00000000..b5304627
--- /dev/null
+++ b/src/resources/ambientoverlay.cpp
@@ -0,0 +1,73 @@
+/*
+ *  The Mana World
+ *  Copyright 2004 The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  The Mana World is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  The Mana World is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with The Mana World; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  $Id$
+ */
+
+#include "ambientoverlay.h"
+
+#include "image.h"
+
+#include "../graphics.h"
+
+AmbientOverlay::AmbientOverlay(Image *img, float parallax,
+        float scrollX, float scrollY, float speedX, float speedY):
+    mImage(img), mParallax(parallax),
+    mScrollX(scrollX), mScrollY(scrollY),
+    mSpeedX(speedX), mSpeedY(speedY)
+{
+    mImage->incRef();
+}
+
+AmbientOverlay::~AmbientOverlay()
+{
+    mImage->decRef();
+}
+
+void AmbientOverlay::update(int timePassed, float dx, float dy)
+{
+    // Self scrolling of the overlay
+    mScrollX -= mSpeedX * timePassed / 10;
+    mScrollY -= mSpeedY * timePassed / 10;
+
+    // Parallax scrolling
+    mScrollX += dx * mParallax;
+    mScrollY += dy * mParallax;
+
+    int imgW = mImage->getWidth();
+    int imgH = mImage->getHeight();
+
+    // Wrap values
+    while (mScrollX > imgW)
+        mScrollX -= imgW;
+    while (mScrollX < 0)
+        mScrollX += imgW;
+
+    while (mScrollY > imgH)
+        mScrollY -= imgH;
+    while (mScrollY < 0)
+        mScrollY += imgH;
+}
+
+void AmbientOverlay::draw(Graphics *graphics, int x, int y)
+{
+    graphics->drawImagePattern(mImage, (int)(-mScrollX), (int)(-mScrollY),
+            x + (int)mScrollX, y + (int)mScrollY);
+}