105 lines
2.2 KiB
C++
105 lines
2.2 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file sphereVolumeEmitter.cxx
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* @author charles
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* @date 2000-06-22
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*/
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#include "sphereVolumeEmitter.h"
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/**
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* constructor
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*/
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SphereVolumeEmitter::
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SphereVolumeEmitter() {
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_radius = 1.0f;
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}
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/**
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* copy constructor
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*/
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SphereVolumeEmitter::
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SphereVolumeEmitter(const SphereVolumeEmitter ©) :
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BaseParticleEmitter(copy) {
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_radius = copy._radius;
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_particle_pos = copy._particle_pos;
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}
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/**
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* destructor
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*/
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SphereVolumeEmitter::
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~SphereVolumeEmitter() {
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}
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/**
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* copier
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*/
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BaseParticleEmitter *SphereVolumeEmitter::
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make_copy() {
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return new SphereVolumeEmitter(*this);
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}
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/**
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* Generates a location for a new particle
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*/
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void SphereVolumeEmitter::
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assign_initial_position(LPoint3& pos) {
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PN_stdfloat z, theta, r;
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PN_stdfloat t;
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z = SPREAD(_radius);
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r = sqrtf((_radius * _radius) - (z * z));
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theta = NORMALIZED_RAND() * 2.0f * MathNumbers::pi_f;
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t = NORMALIZED_RAND();
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while (t == 0.0f)
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t = NORMALIZED_RAND();
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PN_stdfloat pos_x = r * cosf(theta) * t;
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PN_stdfloat pos_y = r * sinf(theta) * t;
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PN_stdfloat pos_z = z * t;
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_particle_pos.set(pos_x, pos_y, pos_z);
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pos = _particle_pos;
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}
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/**
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* Generates a velocity for a new particle
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*/
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void SphereVolumeEmitter::
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assign_initial_velocity(LVector3& vel) {
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// set velocity to [0..1] according to distance from center, along vector
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// from center to position
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vel = _particle_pos / _radius;
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}
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/**
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* Write a string representation of this instance to <out>.
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*/
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void SphereVolumeEmitter::
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output(std::ostream &out) const {
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#ifndef NDEBUG //[
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out<<"SphereVolumeEmitter";
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#endif //] NDEBUG
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}
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/**
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* Write a string representation of this instance to <out>.
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*/
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void SphereVolumeEmitter::
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write(std::ostream &out, int indent) const {
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#ifndef NDEBUG //[
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out.width(indent); out<<""; out<<"SphereVolumeEmitter:\n";
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out.width(indent+2); out<<""; out<<"_radius "<<_radius<<"\n";
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BaseParticleEmitter::write(out, indent+2);
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#endif //] NDEBUG
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}
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