1 files changed, 76 insertions, 0 deletions
diff --git a/src/rotationalparticle.cpp b/src/rotationalparticle.cpp
new file mode 100644
index 00000000..2fd7f901
--- /dev/null
+++ b/src/rotationalparticle.cpp
@@ -0,0 +1,76 @@
+/*
+ *  The Mana World
+ *  Copyright (C) 2006  The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "rotationalparticle.h"
+#include "graphics.h"
+#include "simpleanimation.h"
+
+#define PI 3.14159265
+
+RotationalParticle::RotationalParticle(Map *map, Animation *animation):
+    ImageParticle(map, NULL),
+    mAnimation(new SimpleAnimation(animation))
+{
+}
+
+RotationalParticle::RotationalParticle(Map *map, xmlNodePtr animationNode):
+    ImageParticle(map, 0),
+    mAnimation(new SimpleAnimation(animationNode))
+{
+}
+
+RotationalParticle::~RotationalParticle()
+{
+    delete mAnimation;
+    mImage = NULL;
+}
+
+bool RotationalParticle::update()
+{
+    // TODO: cache velocities to avoid spamming atan2()
+
+    float rad = atan2(mVelocity.x, mVelocity.y);
+    if (rad < 0)
+        rad = PI + (PI + rad);
+    int size = mAnimation->getLength();
+    float range = PI / size;
+
+    // Determines which frame the particle should play
+    if (rad < range || rad > ((PI*2) - range))
+    {
+        mAnimation->setFrame(0);
+    }
+    else
+    {
+        for (int c = 1; c < size; c++)
+        {
+            if (((c * (2 * range)) - range) < rad && rad < ((c * (2 * range)) + range))
+            {
+                mAnimation->setFrame(c);
+                break;
+            }
+        }
+    }
+
+    mImage = mAnimation->getCurrentImage();
+
+    return Particle::update();
+}