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Thursday the 24th of May 2012 @ 01:49am

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cPEmitter.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2003 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "particles/cPEmitter.h" #include "n2l/vfs.h" #include "n2l/dynVars.h" #include "n2l/resourceManagement.h" #include "particles/cParticle.h" #include "particles/cParticleSystem.h" #include "particles/cPParticleSpec.h" #include <iostream> using namespace std; /******************************************************************************/ namespace n2l { /**************************************************************************/ cPEmitter::cPEmitter() { init(); } /**************************************************************************/ cPEmitter::cPEmitter( const cVfsNodeInterface &iNode ) { init(); load( iNode ); } /**************************************************************************/ cPEmitter::cPEmitter( const cDynVar &iDef ) { init(); load( iDef ); } /**************************************************************************/ cPEmitter::~cPEmitter() { } /**************************************************************************/ void cPEmitter::load( const cVfsNodeInterface &iNode ) { const tUint DataOffset = vfsNodeFileWithHeader( iNode, "n2l::cPEmitter"); cDynVar def; def.unserialize( iNode.buffer().c_str()+DataOffset ); load( def ); } /**************************************************************************/ void cPEmitter::load( const cDynVar &iDef ) { frequency( iDef["frequency"].keyValueOr("max",1.0f), iDef["frequency"].keyValueOr("min",0.0f) ); if (iDef.keyExists("particleSpec")) particleSpec( cResourceManager::get<cPParticleSpec>( iDef["particleSpec"]) ); if (iDef.keyExistsAsArray("velocity")) mVel.set( iDef["velocity"][0], iDef["velocity"][1], iDef["velocity"][2] ); if (iDef.keyExistsAsArray("positionJitter")) positionJitter( tVector3f( iDef["positionJitter"][0], iDef["positionJitter"][1], iDef["positionJitter"][2] ) ); if (iDef.keyExistsAsArray("positions")) { const cDynVar::tConstIterator Last = iDef["positions"].end(); for (cDynVar::tConstIterator i = iDef["positions"].begin(); i!=Last; ++i) { mPositions.push_back( tVector3f( i->second[0], i->second[1], i->second[2] ) ); } } } /**************************************************************************/ void cPEmitter::updateInto( const tUint &iTimePassed, cParticleSystem &ioSystem, const tFloat &iThrottle ) { static const tMatrix44f Identity( tMatrix44f().identity() ); updateInto( iTimePassed, ioSystem, Identity, iThrottle ); } /**************************************************************************/ void cPEmitter::updateInto( const tUint &iTimePassed, cParticleSystem &ioSystem, const tMatrix44f &iTransMatrix, const tFloat &iThrottle ) { const tVector3f Zero( 0.0f,0.0f,0.0f ); if (!mPSpec.isSet()) throw cBadDataUseException( "cPEmitter::updateInto", "Called on an emitter with no particle spec" ); // For testing, lets start simple. mRemainder += tSint(iTimePassed); tFloat seconds = mRemainder/1000.0f; tFloat freq = mMinFreq + iThrottle*(mMaxFreq-mMinFreq); tSint emissions = tSint(seconds*freq); if (!emissions) return; mRemainder -= tSint((emissions/freq)*1000.0f); //cout << "Seconds: " << seconds << endl; //cout << "Calc Freq: " << freq << endl; //cout << "# Emissions: " << emissions << endl; //cout << "Remainder (end): " << mRemainder << endl; //cout << "------------------------------------------------" << endl; //return; tVector3f vel; iTransMatrix.multiply( vel, mVel ); for (tSint i=0; i<emissions; ++i) { tVector3f pos; switch (mPositions.size()) { case 0: iTransMatrix.multiply( pos, Zero ); break; case 1: iTransMatrix.multiply( pos, mPositions[0] ); break; default: if (mLastEmissionFrom>=mPositions.size()) mLastEmissionFrom = 0; iTransMatrix.multiply( pos, mPositions[mLastEmissionFrom] ); ++mLastEmissionFrom; break; } if (mPositionJitter) { tVector3f tmp; iTransMatrix.multiply( tmp, mHalfMaxJitter ); pos -= tmp; pos.x() += tmp.x()*(n2lRandom(20000)/10000.0f); pos.y() += tmp.y()*(n2lRandom(20000)/10000.0f); pos.z() += tmp.z()*(n2lRandom(20000)/10000.0f); } pos.x() += iTransMatrix[tMatrix44f::_03]; pos.y() += iTransMatrix[tMatrix44f::_13]; pos.z() += iTransMatrix[tMatrix44f::_23]; ioSystem.ownParticle( mPSpec->newParticle( pos, vel ) ); } } /**************************************************************************/ void cPEmitter::frequency( const tFloat &iMax, const tFloat &iMin ) { mMinFreq = n2lMax(0.0f,n2lMin(iMin,iMax)); mMaxFreq = n2lMax(0.0f,n2lMax(iMin,iMax)); } /**************************************************************************/ void cPEmitter::positionJitter( const tVector3f &iJitter ) { mPositionJitter = true; mHalfMaxJitter = iJitter; mHalfMaxJitter *= 0.5f; } /**************************************************************************/ void cPEmitter::disableJitter() { mPositionJitter = false; } /**************************************************************************/ void cPEmitter::position( const tVector3f &iPos ) { switch (mPositions.size()) { case 1: mPositions[0] = iPos; break; default: mPositions.clear(); mPositions.push_back( iPos ); break; } } /**************************************************************************/ void cPEmitter::addFacePositions( const tTriangle3f &iTri, const tFloat &iMaxSurfaceArea, const tFloat &iMinSurfaceArea ) { const tFloat Area = iTri.area(); if (Area>iMaxSurfaceArea) { tTriangle3f a,b; iTri.subdivideLongest( a,b ); addFacePositions( a, iMaxSurfaceArea, 0.0f ); addFacePositions( b, iMaxSurfaceArea, 0.0f ); } else if (Area>iMinSurfaceArea) addPosition( iTri.center() ); } /**************************************************************************/ void cPEmitter::particleSpec( const cAutoPtr<const cPParticleSpec> &iSpec ) { mPSpec = iSpec; } /**************************************************************************/ /**************************************************************************/ /**************************************************************************/ void cPEmitter::init() { mRemainder = 0; mVel.set( 0.0f,0.0f,0.0f ); mMinFreq = 0.0f; mMaxFreq = 1.0f; mPositionJitter = false; mHalfMaxJitter.set(0.0f,0.0f,0.0f); mLastEmissionFrom = 0; } }

©2012 Aaron Cameron