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zSpinParticle.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 zSpinParticle.cxx
10 * @author charles
11 * @date 2000-08-16
12 */
13
14#include "zSpinParticle.h"
15#include "cmath.h"
16
17/**
18 * constructor
19 */
22 BaseParticle() {
23 _initial_angle = 0.0f;
24 _final_angle = 0.0f;
25 _cur_angle = 0.0f;
26 _angular_velocity = 0.0f;
27 _bUseAngularVelocity = false;
28}
29
30/**
31 * copy constructor
32 */
34ZSpinParticle(const ZSpinParticle &copy) :
35 BaseParticle(copy) {
36 _initial_angle = copy._initial_angle;
37 _final_angle = copy._final_angle;
38 _cur_angle = copy._cur_angle;
39 _angular_velocity = copy._angular_velocity;
40 _bUseAngularVelocity = copy._bUseAngularVelocity;
41}
42
43/**
44 * destructor
45 */
49
50/**
51 * dynamic copier
52 */
54make_copy() const {
55 return new ZSpinParticle(*this);
56}
57
58/**
59 *
60 */
61void ZSpinParticle::
62init() {
63}
64
65/**
66 *
67 */
68void ZSpinParticle::
69update() {
70 // if using final_angle, want age to range from [0,1] over lifespan, so use
71 // parameterized_age for angular velocity, should be allowed to range freely
72 // upward, use regular age
73
74 if(_bUseAngularVelocity) {
75 // interpolate the current orientation
76 _cur_angle = _initial_angle + (get_age() * _angular_velocity);
77 } else {
78 _cur_angle = _initial_angle + (get_parameterized_age() * (_final_angle - _initial_angle));
79 }
80
81 // normalize the result to [0..360)
82 _cur_angle = cmod(_cur_angle, (PN_stdfloat)360.0);
83
84 // if _cur_angle was negative, it is still negative after cmod, wrap it
85 // around by adding 360
86
87 // is this really necessary? should be in range of sincos
88 if(_cur_angle < 0.0f)
89 _cur_angle += 360.0f;
90}
91
92/**
93 *
94 */
95void ZSpinParticle::
96die() {
97}
98
99/**
100 *
101 */
103get_theta() const {
104 return _cur_angle;
105}
106
107/**
108 * Write a string representation of this instance to <out>.
109 */
111output(std::ostream &out) const {
112 #ifndef NDEBUG //[
113 out<<"ZSpinParticle";
114 #endif //] NDEBUG
115}
116
117/**
118 * Write a string representation of this instance to <out>.
119 */
121write(std::ostream &out, int indent) const {
122 #ifndef NDEBUG //[
123 out.width(indent); out<<""; out<<"ZSpinParticle:\n";
124 out.width(indent+2); out<<""; out<<"_initial_angle "<<_initial_angle<<"\n";
125 out.width(indent+2); out<<""; out<<"_final_angle "<<_final_angle<<"\n";
126 out.width(indent+2); out<<""; out<<"_cur_angle "<<_cur_angle<<"\n";
127 out.width(indent+2); out<<""; out<<"_angular_velocity "<<_angular_velocity<<"\n";
128 out.width(indent+2); out<<""; out<<"_bUseAngularVelocity "<<_bUseAngularVelocity<<"\n";
130 #endif //] NDEBUG
131}
An individual, physically-modelable particle abstract base class.
virtual void write(std::ostream &out, int indent=0) const
Write a string representation of this instance to <out>.
A body on which physics will be applied.
describes a particle that spins along its z axis.
virtual void write(std::ostream &out, int indent=0) const
Write a string representation of this instance to <out>.
ZSpinParticle()
constructor
virtual PhysicsObject * make_copy() const
dynamic copier
virtual void output(std::ostream &out) const
Write a string representation of this instance to <out>.
virtual PN_stdfloat get_theta() const
for spriteParticleRenderer
virtual ~ZSpinParticle()
destructor
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
float cmod(float x, float y)
This is similar to fmod(), but it behaves properly when x is negative: that is, it always returns a v...
Definition cmath.I:130
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.