Panda3D
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tangentRingEmitter.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file tangentRingEmitter.cxx
10 * @author charles
11 * @date 2000-07-25
12 */
13
14#include "tangentRingEmitter.h"
15
16/**
17 * constructor
18 */
21 _radius = 1.0f;
22 _radius_spread = 0.0f;
23}
24
25/**
26 * copy constructor
27 */
31 _radius = copy._radius;
32 _radius_spread = copy._radius_spread;
33}
34
35/**
36 * destructor
37 */
41
42/**
43 * child copier
44 */
49
50/**
51 * Generates a location for a new particle
52 */
53void TangentRingEmitter::
54assign_initial_position(LPoint3& pos) {
55 PN_stdfloat theta = NORMALIZED_RAND() * 2.0f * MathNumbers::pi_f;
56
57 _x = cosf(theta);
58 _y = sinf(theta);
59
60 PN_stdfloat new_radius = _radius + SPREAD(_radius_spread);
61 pos.set(new_radius * _x, new_radius * _y, 0.0f);
62}
63
64/**
65 * Generates a velocity for a new particle
66 */
67void TangentRingEmitter::
68assign_initial_velocity(LVector3& vel) {
69 vel.set(-_y, _x, 0.0f);
70}
71
72/**
73 * Write a string representation of this instance to <out>.
74 */
76output(std::ostream &out) const {
77 #ifndef NDEBUG //[
78 out<<"TangentRingEmitter";
79 #endif //] NDEBUG
80}
81
82/**
83 * Write a string representation of this instance to <out>.
84 */
86write(std::ostream &out, int indent) const {
87 #ifndef NDEBUG //[
88 out.width(indent); out<<""; out<<"TangentRingEmitter:\n";
89 out.width(indent+2); out<<""; out<<"_radius "<<_radius<<"\n";
90 out.width(indent+2); out<<""; out<<"_radius_spread "<<_radius_spread<<"\n";
91 out.width(indent+2); out<<""; out<<"_x "<<_x<<"\n";
92 out.width(indent+2); out<<""; out<<"_y "<<_y<<"\n";
94 #endif //] NDEBUG
95}
virtual void write(std::ostream &out, int indent=0) const
Write a string representation of this instance to <out>.
Describes a planar ring region in which tangent particles are generated, and particles fly off tangen...
virtual BaseParticleEmitter * make_copy()
child copier
virtual ~TangentRingEmitter()
destructor
virtual void output(std::ostream &out) const
Write a string representation of this instance to <out>.
virtual void write(std::ostream &out, int indent=0) const
Write a string representation of this instance to <out>.
TangentRingEmitter()
constructor
std::ostream & indent(std::ostream &out, int indent_level)
A handy function for doing text formatting.
Definition indent.cxx:20
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.