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-rw-r--r--src/rotationalparticle.cpp76
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diff --git a/src/rotationalparticle.cpp b/src/rotationalparticle.cpp
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+/*
+ * 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();
+}