1 | /*
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2 | -----------------------------------------------------------------------------
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3 | This source file is part of OGRE
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4 | (Object-oriented Graphics Rendering Engine)
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5 | For the latest info, see http://www.ogre3d.org/
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6 |
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7 | Copyright (c) 2000-2005 The OGRE Team
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8 | Also see acknowledgements in Readme.html
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9 |
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10 | This program is free software; you can redistribute it and/or modify it under
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11 | the terms of the GNU Lesser General Public License as published by the Free Software
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12 | Foundation; either version 2 of the License, or (at your option) any later
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13 | version.
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14 |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT
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16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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18 |
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19 | You should have received a copy of the GNU Lesser General Public License along with
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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22 | http://www.gnu.org/copyleft/lesser.txt.
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23 | -----------------------------------------------------------------------------
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24 | */
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25 | #include "OgreDirectionRandomiserAffector.h"
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26 | #include "OgreParticleSystem.h"
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27 | #include "OgreParticle.h"
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28 | #include "OgreStringConverter.h"
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29 |
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30 |
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31 | namespace Ogre {
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32 |
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33 | // Instantiate statics
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34 | DirectionRandomiserAffector::CmdRandomness DirectionRandomiserAffector::msRandomnessCmd;
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35 | DirectionRandomiserAffector::CmdScope DirectionRandomiserAffector::msScopeCmd;
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36 | DirectionRandomiserAffector::CmdKeepVelocity DirectionRandomiserAffector::msKeepVelocityCmd;
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37 |
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38 | //-----------------------------------------------------------------------
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39 | DirectionRandomiserAffector::DirectionRandomiserAffector(ParticleSystem* psys)
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40 | : ParticleAffector(psys)
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41 | {
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42 | mType = "DirectionRandomiser";
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43 |
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44 | // defaults
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45 | mRandomness = 1.0;
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46 | mScope = 1.0;
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47 | mKeepVelocity = false;
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48 |
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49 | // Set up parameters
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50 | if (createParamDictionary("DirectionRandomiserAffector"))
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51 | {
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52 | addBaseParameters();
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53 | // Add extra paramaters
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54 | ParamDictionary* dict = getParamDictionary();
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55 | dict->addParameter(ParameterDef("randomness",
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56 | "The amount of randomness (chaos) to apply to the particle movement.",
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57 | PT_REAL), &msRandomnessCmd);
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58 | dict->addParameter(ParameterDef("scope",
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59 | "The percentage of particles which is affected.",
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60 | PT_REAL), &msScopeCmd);
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61 | dict->addParameter(ParameterDef("keep_velocity",
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62 | "Detemines whether the velocity of the particles is changed.",
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63 | PT_BOOL), &msKeepVelocityCmd);
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64 | }
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65 | }
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66 | //-----------------------------------------------------------------------
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67 | void DirectionRandomiserAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
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68 | {
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69 | ParticleIterator pi = pSystem->_getIterator();
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70 | Particle *p;
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71 | Real length;
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72 |
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73 | while (!pi.end())
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74 | {
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75 | p = pi.getNext();
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76 | if (mScope > Math::UnitRandom())
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77 | {
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78 | if (!p->direction.isZeroLength())
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79 | {
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80 | if (mKeepVelocity)
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81 | {
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82 | length = p->direction.length();
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83 | }
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84 |
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85 | p->direction += Vector3(Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed,
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86 | Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed,
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87 | Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed);
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88 |
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89 | if (mKeepVelocity)
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90 | {
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91 | p->direction *= length / p->direction.length();
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92 | }
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93 | }
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94 | }
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95 | }
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96 | }
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97 | //-----------------------------------------------------------------------
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98 | void DirectionRandomiserAffector::setRandomness(Real force)
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99 | {
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100 | mRandomness = force;
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101 | }
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102 | //-----------------------------------------------------------------------
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103 | void DirectionRandomiserAffector::setScope(Real scope)
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104 | {
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105 | mScope = scope;
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106 | }
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107 | //-----------------------------------------------------------------------
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108 | void DirectionRandomiserAffector::setKeepVelocity(bool keepVelocity)
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109 | {
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110 | mKeepVelocity = keepVelocity;
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111 | }
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112 | //-----------------------------------------------------------------------
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113 | Real DirectionRandomiserAffector::getRandomness(void) const
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114 | {
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115 | return mRandomness;
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116 | }
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117 | //-----------------------------------------------------------------------
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118 | Real DirectionRandomiserAffector::getScope(void) const
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119 | {
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120 | return mScope;
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121 | }
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122 | //-----------------------------------------------------------------------
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123 | bool DirectionRandomiserAffector::getKeepVelocity(void) const
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124 | {
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125 | return mKeepVelocity;
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126 | }
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127 |
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128 | //-----------------------------------------------------------------------
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129 | //-----------------------------------------------------------------------
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130 | // Command objects
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131 | //-----------------------------------------------------------------------
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132 | //-----------------------------------------------------------------------
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133 | String DirectionRandomiserAffector::CmdRandomness::doGet(const void* target) const
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134 | {
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135 | return StringConverter::toString(
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136 | static_cast<const DirectionRandomiserAffector*>(target)->getRandomness() );
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137 | }
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138 | void DirectionRandomiserAffector::CmdRandomness::doSet(void* target, const String& val)
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139 | {
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140 | static_cast<DirectionRandomiserAffector*>(target)->setRandomness(StringConverter::parseReal(val));
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141 | }
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142 |
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143 | String DirectionRandomiserAffector::CmdScope::doGet(const void* target) const
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144 | {
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145 | return StringConverter::toString(
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146 | static_cast<const DirectionRandomiserAffector*>(target)->getScope() );
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147 | }
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148 | void DirectionRandomiserAffector::CmdScope::doSet(void* target, const String& val)
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149 | {
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150 | static_cast<DirectionRandomiserAffector*>(target)->setScope(StringConverter::parseReal(val));
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151 | }
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152 | String DirectionRandomiserAffector::CmdKeepVelocity::doGet(const void* target) const
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153 | {
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154 | return StringConverter::toString(
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155 | static_cast<const DirectionRandomiserAffector*>(target)->getKeepVelocity() );
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156 | }
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157 | void DirectionRandomiserAffector::CmdKeepVelocity::doSet(void* target, const String& val)
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158 | {
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159 | static_cast<DirectionRandomiserAffector*>(target)->setKeepVelocity(StringConverter::parseBool(val));
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160 | }
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161 |
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162 | }
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