tangentRingEmitter.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file tangentRingEmitter.cxx
 * @author charles
 * @date 2000-07-25
 */

#include "tangentRingEmitter.h"

/**
 * constructor
 */
TangentRingEmitter::
TangentRingEmitter() {
  _radius = 1.0f;
  _radius_spread = 0.0f;
}

/**
 * copy constructor
 */
TangentRingEmitter::
TangentRingEmitter(const TangentRingEmitter &copy) :
  BaseParticleEmitter(copy) {
  _radius = copy._radius;
  _radius_spread = copy._radius_spread;
}

/**
 * destructor
 */
TangentRingEmitter::
~TangentRingEmitter() {
}

/**
 * child copier
 */
BaseParticleEmitter *TangentRingEmitter::
make_copy() {
  return new TangentRingEmitter(*this);
}

/**
 * Generates a location for a new particle
 */
void TangentRingEmitter::
assign_initial_position(LPoint3& pos) {
  PN_stdfloat theta = NORMALIZED_RAND() * 2.0f * MathNumbers::pi_f;

  _x = cosf(theta);
  _y = sinf(theta);

  PN_stdfloat new_radius = _radius + SPREAD(_radius_spread);
  pos.set(new_radius * _x, new_radius * _y, 0.0f);
}

/**
 * Generates a velocity for a new particle
 */
void TangentRingEmitter::
assign_initial_velocity(LVector3& vel) {
  vel.set(-_y, _x, 0.0f);
}

/**
 * Write a string representation of this instance to <out>.
 */
void TangentRingEmitter::
output(std::ostream &out) const {
  #ifndef NDEBUG //[
  out<<"TangentRingEmitter";
  #endif //] NDEBUG
}

/**
 * Write a string representation of this instance to <out>.
 */
void TangentRingEmitter::
write(std::ostream &out, int indent) const {
  #ifndef NDEBUG //[
  out.width(indent); out<<""; out<<"TangentRingEmitter:\n";
  out.width(indent+2); out<<""; out<<"_radius "<<_radius<<"\n";
  out.width(indent+2); out<<""; out<<"_radius_spread "<<_radius_spread<<"\n";
  out.width(indent+2); out<<""; out<<"_x "<<_x<<"\n";
  out.width(indent+2); out<<""; out<<"_y "<<_y<<"\n";
  BaseParticleEmitter::write(out, indent+2);
  #endif //] NDEBUG
}