Panda3D
Loading...
Searching...
No Matches
hermiteCurve.h
Go to the documentation of this file.
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 hermiteCurve.h
10 * @author drose
11 * @date 1998-02-27
12 */
13
14#ifndef HERMITECURVE_H
15#define HERMITECURVE_H
16
17#include "piecewiseCurve.h"
18#include "cubicCurveseg.h"
19
20
21BEGIN_PUBLISH //[
22// Hermite curve continuity types.
23#define HC_CUT 1
24// The curve is disconnected at this point. All points between this and the
25// following CV are not part of the curve.
26
27#define HC_FREE 2
28// Tangents are unconstrained. The curve is continuous, but its first
29// derivative is not. This is G0 geometric continuity.
30
31#define HC_G1 3
32// Tangents are constrained to be collinear. The curve's derivative is not
33// continuous in parametric space, but its geometric slope is. The
34// distinction is mainly relevant in the context of animation along the curve
35// --when crossing the join point, direction of motion will change
36// continuously, but the speed of motion may change suddenly. This is G1
37// geometric continuity.
38
39#define HC_SMOOTH 4
40// Tangents are constrained to be identical. The curve and its first
41// derivative are continuous in parametric space. When animating motion
42// across the join point, speed and direction of motion will change
43// continuously. This is C1 parametric continuity.
44END_PUBLISH //]
45
46/**
47 * A single CV of a Hermite curve. Hermite curve CV's include an in and out
48 * tangent, as well as a position.
49 */
50class EXPCL_PANDA_PARAMETRICS HermiteCurveCV {
51public:
55
56 void set_point(const LVecBase3 &point) { _p = point; }
57 void set_in(const LVecBase3 &in);
58 void set_out(const LVecBase3 &out);
59 void set_type(int type);
60 void set_name(const std::string &name);
61
62 void format_egg(std::ostream &out, int indent, int num_dimensions,
63 bool show_in, bool show_out,
64 PN_stdfloat scale_in, PN_stdfloat scale_out) const;
65
66 void write_datagram(BamWriter *manager, Datagram &me) const;
67 void fillin(DatagramIterator &scan, BamReader *manager);
68
69 LVecBase3 _p, _in, _out;
70 int _type;
71 std::string _name;
72};
73
74/**
75 * A parametric curve defined by a sequence of control vertices, each with an
76 * in and out tangent.
77 *
78 * This class is actually implemented as a PiecewiseCurve made up of several
79 * CubicCurvesegs, each of which is created using the hermite_basis() method.
80 * The HermiteCurve class itself keeps its own list of the CV's that are used
81 * to define the curve (since the CubicCurveseg class doesn't retain these).
82 */
83class EXPCL_PANDA_PARAMETRICS HermiteCurve : public PiecewiseCurve {
84PUBLISHED:
87 virtual ~HermiteCurve();
88
89 int get_num_cvs() const;
90
91 int insert_cv(PN_stdfloat t);
92 int append_cv(int type, PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
93 inline int append_cv(int type, const LVecBase3 &v) {
94 return append_cv(type, v[0], v[1], v[2]);
95 }
96
97 bool remove_cv(int n);
98 void remove_all_cvs();
99
100 bool set_cv_type(int n, int type);
101 bool set_cv_point(int n, PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
102 inline bool set_cv_point(int n, const LVecBase3 &v) {
103 return set_cv_point(n, v[0], v[1], v[2]);
104 }
105 bool set_cv_in(int n, PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
106 inline bool set_cv_in(int n, const LVecBase3 &v) {
107 return set_cv_in(n, v[0], v[1], v[2]);
108 }
109 bool set_cv_out(int n, PN_stdfloat x, PN_stdfloat y, PN_stdfloat z);
110 inline bool set_cv_out(int n, const LVecBase3 &v) {
111 return set_cv_out(n, v[0], v[1], v[2]);
112 }
113 bool set_cv_tstart(int n, PN_stdfloat tstart);
114 bool set_cv_name(int n, const char *name);
115
116
117 int get_cv_type(int n) const;
118 const LVecBase3 &get_cv_point(int n) const;
119 void get_cv_point(int n, LVecBase3 &v) const;
120 const LVecBase3 &get_cv_in(int n) const;
121 void get_cv_in(int n, LVecBase3 &v) const;
122 const LVecBase3 &get_cv_out(int n) const;
123 void get_cv_out(int n, LVecBase3 &v) const;
124 PN_stdfloat get_cv_tstart(int n) const;
125 std::string get_cv_name(int n) const;
126
127 virtual void output(std::ostream &out) const;
128 void write_cv(std::ostream &out, int n) const;
129
130public:
131
132 CubicCurveseg *get_curveseg(int ti) {
134 }
135
136 virtual bool
137 rebuild_curveseg(int rtype0, PN_stdfloat t0, const LVecBase4 &v0,
138 int rtype1, PN_stdfloat t1, const LVecBase4 &v1,
139 int rtype2, PN_stdfloat t2, const LVecBase4 &v2,
140 int rtype3, PN_stdfloat t3, const LVecBase4 &v3);
141
142protected:
143 virtual bool format_egg(std::ostream &out, const std::string &name,
144 const std::string &curve_type, int indent_level) const;
145
146 void invalidate_cv(int n, bool redo_all);
147 int find_cv(PN_stdfloat t);
148 void recompute_basis();
149
151
152// TypedWritable stuff
153public:
154 static void register_with_read_factory();
155
156protected:
157 static TypedWritable *make_HermiteCurve(const FactoryParams &params);
158 virtual void write_datagram(BamWriter *manager, Datagram &me);
159 void fillin(DatagramIterator &scan, BamReader *manager);
160
161public:
162 static TypeHandle get_class_type() {
163 return _type_handle;
164 }
165 static void init_type() {
166 PiecewiseCurve::init_type();
167 register_type(_type_handle, "HermiteCurve",
168 PiecewiseCurve::get_class_type());
169 }
170 virtual TypeHandle get_type() const {
171 return get_class_type();
172 }
173 virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
174
175private:
176 static TypeHandle _type_handle;
177};
178
179#endif
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition bamReader.h:110
This is the fundamental interface for writing binary objects to a Bam file, to be extracted later by ...
Definition bamWriter.h:63
A CubicCurveseg is any curve that can be completely described by four 4-valued basis vectors,...
A class to retrieve the individual data elements previously stored in a Datagram.
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition datagram.h:38
An instance of this class is passed to the Factory when requesting it to do its business and construc...
A single CV of a Hermite curve.
A parametric curve defined by a sequence of control vertices, each with an in and out tangent.
A virtual base class for parametric curves.
A PiecewiseCurve is a curve made up of several curve segments, connected in a head-to-tail fashion.
ParametricCurve * get_curveseg(int ti)
Returns the curve segment corresponding to the given index.
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
Base class for objects that can be written to and read from Bam files.
This is our own Panda specialization on the default STL vector.
Definition pvector.h:42
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
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.
void register_type(TypeHandle &type_handle, const std::string &name)
This inline function is just a convenient way to call TypeRegistry::register_type(),...