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-rw-r--r--src/particle/rotationalparticle.cpp96
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diff --git a/src/particle/rotationalparticle.cpp b/src/particle/rotationalparticle.cpp
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+++ b/src/particle/rotationalparticle.cpp
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+/*
+ * The ManaPlus Client
+ * Copyright (C) 2006-2009 The Mana World Development Team
+ * Copyright (C) 2009-2010 The Mana Developers
+ * Copyright (C) 2011-2013 The ManaPlus Developers
+ *
+ * This file is part of The ManaPlus Client.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "particle/rotationalparticle.h"
+
+#include "simpleanimation.h"
+
+#include "render/graphics.h"
+
+#include <math.h>
+
+#include "debug.h"
+
+static const double PI = M_PI;
+static const float PI2 = 2 * M_PI;
+
+RotationalParticle::RotationalParticle(Map *const map,
+ Animation *const animation) :
+ ImageParticle(map, nullptr),
+ mAnimation(new SimpleAnimation(animation))
+{
+}
+
+RotationalParticle::RotationalParticle(Map *const map,
+ const XmlNodePtr animationNode,
+ const std::string& dyePalettes):
+ ImageParticle(map, nullptr),
+ mAnimation(new SimpleAnimation(animationNode, dyePalettes))
+{
+}
+
+RotationalParticle::~RotationalParticle()
+{
+ delete mAnimation;
+ mAnimation = nullptr;
+ mImage = nullptr;
+}
+
+bool RotationalParticle::update()
+{
+ if (!mAnimation)
+ return false;
+
+ // TODO: cache velocities to avoid spamming atan2()
+
+ const int size = mAnimation->getLength();
+ if (!size)
+ return false;
+
+ float rad = static_cast<float>(atan2(mVelocity.x, mVelocity.y));
+ if (rad < 0)
+ rad = PI2 + rad;
+
+ const float range = static_cast<const float>(PI / size);
+
+ // Determines which frame the particle should play
+ if (rad < range || rad > PI2 - range)
+ {
+ mAnimation->setFrame(0);
+ }
+ else
+ {
+ for (int c = 1; c < size; c++)
+ {
+ if (((static_cast<float>(c) * (2 * range)) - range) < rad
+ && rad < ((static_cast<float>(c) * (2 * range)) + range))
+ {
+ mAnimation->setFrame(c);
+ break;
+ }
+ }
+ }
+
+ mImage = mAnimation->getCurrentImage();
+
+ return Particle::update();
+}