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panda/src/particlesystem/baseParticleEmitter.cxx

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// Filename: baseParticleEmitter.cxx
// Created by:  charles (14Jun00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "baseParticleEmitter.h"

#include <stdlib.h>

////////////////////////////////////////////////////////////////////
//    Function : BaseParticleEmitter
//      Access : Protected
// Description : constructor
////////////////////////////////////////////////////////////////////
BaseParticleEmitter::
BaseParticleEmitter(void) {
  _emission_type = ET_RADIATE;
  _explicit_launch_vector.set(1,0,0);
  _radiate_origin.set(0,0,0);
  _amplitude = 1.0f;
  _amplitude_spread = 0.0f;
  _offset_force.set(0,0,0);
}

////////////////////////////////////////////////////////////////////
//    Function : BaseParticleEmitter
//      Access : Protected
// Description : copy constructor
////////////////////////////////////////////////////////////////////
BaseParticleEmitter::
BaseParticleEmitter(const BaseParticleEmitter &copy) {
  _emission_type = copy._emission_type;
  _explicit_launch_vector = copy._explicit_launch_vector;
  _radiate_origin = copy._radiate_origin;
  _amplitude = copy._amplitude;
  _amplitude_spread = copy._amplitude_spread;
  _offset_force = copy._offset_force;
}

////////////////////////////////////////////////////////////////////
//    Function : BaseParticleEmitter
//      Access : Protected
// Description : destructor
////////////////////////////////////////////////////////////////////
BaseParticleEmitter::
~BaseParticleEmitter(void) {
}

////////////////////////////////////////////////////////////////////
//    Function : generate
//      Access : Public
// Description : parent generation function
////////////////////////////////////////////////////////////////////
void BaseParticleEmitter::
generate(LPoint3f& pos, LVector3f& vel) {
  assign_initial_position(pos);

  switch(_emission_type)
  {
    case ET_EXPLICIT:
      vel = _explicit_launch_vector;
      break;

    case ET_RADIATE:
      vel = pos - _radiate_origin;
      vel.normalize();
      break;

    case ET_CUSTOM:
      assign_initial_velocity(vel);
      break;
  }

  vel *= _amplitude + SPREAD(_amplitude_spread);
  vel += _offset_force;
}

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