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diff --git a/src/particleemitterprop.h b/src/particleemitterprop.h
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+/*
+ * The Mana Client
+ * Copyright (C) 2006-2009 The Mana World Development Team
+ * Copyright (C) 2009-2010 The Mana Developers
+ *
+ * This file is part of The Mana 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 <cmath>
+
+/**
+ * Returns a random numeric value that is larger than or equal min and smaller
+ * than max
+ */
+
+enum ChangeFunc
+{
+ FUNC_NONE = 0,
+ FUNC_SINE,
+ FUNC_SAW,
+ FUNC_TRIANGLE,
+ FUNC_SQUARE
+};
+
+template <typename T> struct ParticleEmitterProp
+{
+ ParticleEmitterProp():
+ minVal(0), maxVal(0), changeFunc(FUNC_NONE),
+ changeAmplitude(0), changePeriod(0), changePhase(0)
+ {
+ }
+
+ void set(T min, T max)
+ {
+ minVal = min;
+ maxVal = max;
+ }
+
+ void set(T val)
+ {
+ set(val, val);
+ }
+
+ void setFunction(ChangeFunc func, T amplitude, int period, int phase)
+ {
+ changeFunc = func;
+ changeAmplitude = amplitude;
+ changePeriod = period;
+ changePhase = phase;
+ }
+
+ T value(int tick)
+ {
+ tick += changePhase;
+ T val = (T) (minVal + (maxVal - minVal)
+ * (rand() / ((double) RAND_MAX + 1)));
+
+ switch (changeFunc)
+ {
+ case FUNC_SINE:
+ val += (T) std::sin(M_PI * 2 * ((double)(tick % changePeriod)
+ / (double)changePeriod)) * changeAmplitude;
+ break;
+ case FUNC_SAW:
+ val += (T) (changeAmplitude * ((double)(tick % changePeriod)
+ / (double)changePeriod)) * 2 - changeAmplitude;
+ break;
+ case FUNC_TRIANGLE:
+ if ((tick % changePeriod) * 2 < changePeriod)
+ {
+ val += changeAmplitude - (T)((tick % changePeriod)
+ / (double)changePeriod) * changeAmplitude * 4;
+ }
+ else
+ {
+ val += changeAmplitude * -3 + (T)((tick % changePeriod)
+ / (double)changePeriod) * changeAmplitude * 4;
+ // I have no idea why this works but it does
+ }
+ break;
+ case FUNC_SQUARE:
+ if ((tick % changePeriod) * 2 < changePeriod)
+ val += changeAmplitude;
+ else
+ val -= changeAmplitude;
+ break;
+ case FUNC_NONE:
+ default:
+ //nothing
+ break;
+ }
+
+ return val;
+ }
+
+ T minVal;
+ T maxVal;
+
+ ChangeFunc changeFunc;
+ T changeAmplitude;
+ int changePeriod;
+ int changePhase;
+};