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author | Philipp Sehmisch <tmw@crushnet.org> | 2008-10-26 01:46:40 +0000 |
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committer | Philipp Sehmisch <tmw@crushnet.org> | 2008-10-26 01:46:40 +0000 |
commit | 56410d9ff28448a73be7a7d115d54c1ee578972c (patch) | |
tree | b9a7b56222610d08215eaf29cb921635b9e3081b /src/particleemitterprop.h | |
parent | c650e2b6338cf4b18b0968623d12ef95a7b820fc (diff) | |
download | mana-client-56410d9ff28448a73be7a7d115d54c1ee578972c.tar.gz mana-client-56410d9ff28448a73be7a7d115d54c1ee578972c.tar.bz2 mana-client-56410d9ff28448a73be7a7d115d54c1ee578972c.tar.xz mana-client-56410d9ff28448a73be7a7d115d54c1ee578972c.zip |
Implemented particle emitters with properties which change over time according to wave functions.
Diffstat (limited to 'src/particleemitterprop.h')
-rw-r--r-- | src/particleemitterprop.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/particleemitterprop.h b/src/particleemitterprop.h new file mode 100644 index 00000000..e645c169 --- /dev/null +++ b/src/particleemitterprop.h @@ -0,0 +1,112 @@ +/* + * The Mana World + * Copyright 2006 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 <cstdlib> +#include <cmath> + +/** + * Returns a random numeric value that is larger than or equal min and smaller + * than max + */ + +enum ChangeFunc +{ + FUNC_NONE, + FUNC_SINE, + FUNC_SAW, + FUNC_TRIANGLE, + FUNC_SQUARE +}; + +template <typename T> struct ParticleEmitterProp +{ + ParticleEmitterProp(): + changeFunc(FUNC_NONE) + { + } + + 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; +}; |