Panda3D

nurbsCurveInterface.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 nurbsCurveInterface.cxx
10 * @author drose
11 * @date 2001-03-02
12 */
13
14 #include "nurbsCurveInterface.h"
15 #include "parametricCurve.h"
16 #include "config_parametrics.h"
17
18 TypeHandle NurbsCurveInterface::_type_handle;
19
20 /**
21 *
22 */
23 NurbsCurveInterface::
24 ~NurbsCurveInterface() {
25 }
26
27 /**
28 * Sets the weight of the indicated CV without affecting its position in 3-d
29 * space.
30 */
31 bool NurbsCurveInterface::
32 set_cv_weight(int n, PN_stdfloat w) {
33 nassertr(n >= 0 && n < get_num_cvs(), false);
34 LVecBase4 cv = get_cv(n);
35 if (cv[3] == 0.0f) {
36 cv.set(0.0f, 0.0f, 0.0f, w);
37 } else {
38 cv *= w / cv[3];
39 }
40 return set_cv(n, cv);
41 }
42
43 /**
44 *
45 */
46 void NurbsCurveInterface::
47 write_cv(std::ostream &out, int n) const {
48 nassertv(n >= 0 && n < get_num_cvs());
49
50 out << "CV " << n << ": " << get_cv_point(n) << ", weight "
51 << get_cv_weight(n) << "\n";
52 }
53
54 /**
55 *
56 */
57 void NurbsCurveInterface::
58 write(std::ostream &out, int indent_level) const {
59 indent(out, indent_level);
60
61 PN_stdfloat min_t = 0.0f;
62 PN_stdfloat max_t = 0.0f;
63
64 if (get_num_knots() > 0) {
65 min_t = get_knot(0);
66 max_t = get_knot(get_num_knots() - 1);
67 }
68
69 out << "NurbsCurve, order " << get_order() << ", " << get_num_cvs()
70 << " CV's. t ranges from " << min_t << " to " << max_t << ".\n";
71
72 indent(out, indent_level)
73 << "CV's:\n";
74 int i;
75 int num_cvs = get_num_cvs();
76 for (i = 0; i < num_cvs; i++) {
77 indent(out, indent_level)
78 << i << ") " << get_cv_point(i) << ", weight "
79 << get_cv_weight(i) << "\n";
80 }
81
82 indent(out, indent_level)
83 << "Knots: ";
84 int num_knots = get_num_knots();
85 for (i = 0; i < num_knots; i++) {
86 out << " " << get_knot(i);
87 }
88 out << "\n";
89 }
90
91
92 /**
93 * Formats the Nurbs curve for output to an Egg file.
94 */
95 bool NurbsCurveInterface::
96 format_egg(std::ostream &out, const std::string &name, const std::string &curve_type,
97 int indent_level) const {
98 indent(out, indent_level)
99 << "<VertexPool> " << name << ".pool {\n";
100
101 int num_cvs = get_num_cvs();
102 int cv;
103 for (cv = 0; cv < get_num_cvs(); cv++) {
104 indent(out, indent_level+2)
105 << "<Vertex> " << cv << " { " << get_cv(cv) << " }\n";
106 }
107 indent(out, indent_level)
108 << "}\n";
109
110 indent(out, indent_level)
111 << "<NurbsCurve> " << name << " {\n";
112
113 if (!curve_type.empty()) {
114 indent(out, indent_level+2)
115 << "<Scalar> type { " << curve_type << " }\n";
116 }
117
118 indent(out, indent_level+2) << "<Order> { " << get_order() << " }\n";
119
120 indent(out, indent_level+2) << "<Knots> {";
121 int k;
122 int num_knots = get_num_knots();
123
124 for (k = 0; k < num_knots; k++) {
125 if (k%6 == 0) {
126 out << "\n";
127 indent(out, indent_level+4);
128 }
129 out << get_knot(k) << " ";
130 }
131 out << "\n";
132 indent(out, indent_level+2) << "}\n";
133
134 indent(out, indent_level+2) << "<VertexRef> {";
135 for (cv = 0; cv < num_cvs; cv++) {
136 if (cv%10 == 0) {
137 out << "\n";
138 indent(out, indent_level+3);
139 }
140 out << " " << cv;
141 }
142 out << "\n";
143 indent(out, indent_level+4)
144 << "<Ref> { " << name << ".pool }\n";
145 indent(out, indent_level+2) << "}\n";
146
147 indent(out, indent_level) << "}\n";
148
149 return true;
150 }
151
152 /**
153 * Stores in the indicated NurbsCurve a NURBS representation of an equivalent
154 * curve. Returns true if successful, false otherwise.
155 */
156 bool NurbsCurveInterface::
157 convert_to_nurbs(ParametricCurve *nc) const {
158 NurbsCurveInterface *nurbs = nc->get_nurbs_interface();
159 nassertr(nurbs != nullptr, false);
160
161 nurbs->remove_all_cvs();
162 nurbs->set_order(get_order());
163
164 int num_cvs = get_num_cvs();
165 int i;
166 for (i = 0; i < num_cvs; i++) {
167 nurbs->append_cv(get_cv(i));
168 }
169
170 int num_knots = get_num_knots();
171 for (i = 0; i < num_knots; i++) {
172 nurbs->set_knot(i, get_knot(i));
173 }
174
175 return nc->recompute();
176 }
NurbsCurveInterface
This abstract class defines the interface only for a Nurbs-style curve, with knots and coordinates in...
Definition: nurbsCurveInterface.h:30
NurbsCurveInterface::set_cv_weight
bool set_cv_weight(int n, PN_stdfloat w)
Sets the weight of the indicated CV without affecting its position in 3-d space.
Definition: nurbsCurveInterface.cxx:32
NurbsCurveInterface::get_cv_weight
PN_stdfloat get_cv_weight(int n) const
Returns the weight of the indicated CV.
Definition: nurbsCurveInterface.I:70
NurbsCurveInterface::get_cv_point
LVecBase3 get_cv_point(int n) const
Returns the position of the indicated CV.
Definition: nurbsCurveInterface.I:59
ParametricCurve
A virtual base class for parametric curves.
Definition: parametricCurve.h:56
ParametricCurve::recompute
virtual bool recompute()
Recalculates the curve, if necessary.
Definition: parametricCurve.cxx:283
ParametricCurve::get_nurbs_interface
virtual NurbsCurveInterface * get_nurbs_interface()
Returns a pointer to the object as a NurbsCurveInterface object if it happens to be a NURBS-style cur...
Definition: parametricCurve.cxx:420
TypeHandle
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:81
config_parametrics.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
indent
std::ostream & indent(std::ostream &out, int indent_level)
A handy function for doing text formatting.
Definition: indent.cxx:20
nurbsCurveInterface.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
parametricCurve.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.