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fltTransformRotateAboutEdge.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 fltTransformRotateAboutEdge.cxx
10 * @author drose
11 * @date 2000-08-30
12 */
13
15#include "fltRecordReader.h"
16#include "fltRecordWriter.h"
17
18TypeHandle FltTransformRotateAboutEdge::_type_handle;
19
20/**
21 *
22 */
23FltTransformRotateAboutEdge::
24FltTransformRotateAboutEdge(FltHeader *header) : FltTransformRecord(header) {
25 _point_a.set(0.0, 0.0, 0.0);
26 _point_b.set(1.0, 0.0, 0.0);
27 _angle = 0.0;
28}
29
30/**
31 * Defines the rotation. The angle is given in degrees, counterclockwise
32 * about the axis as seen from point a.
33 */
35set(const LPoint3d &point_a, const LPoint3d &point_b, PN_stdfloat angle) {
36 _point_a = point_a;
37 _point_b = point_b;
38 _angle = angle;
39
40 recompute_matrix();
41}
42
43/**
44 *
45 */
46const LPoint3d &FltTransformRotateAboutEdge::
47get_point_a() const {
48 return _point_a;
49}
50
51/**
52 *
53 */
54const LPoint3d &FltTransformRotateAboutEdge::
55get_point_b() const {
56 return _point_b;
57}
58
59/**
60 * Returns the angle of rotation, in degrees counterclockwise about the axis
61 * as seen from point a.
62 */
64get_angle() const {
65 return _angle;
66}
67
68/**
69 *
70 */
71void FltTransformRotateAboutEdge::
72recompute_matrix() {
73 if (_point_a == _point_b) {
74 // Degenerate case.
75 _matrix = LMatrix4d::ident_mat();
76 } else {
77 LVector3d axis = _point_b - _point_a;
78 _matrix =
79 LMatrix4d::translate_mat(-_point_a) *
80 LMatrix4d::rotate_mat(_angle, normalize(axis), CS_zup_right) *
81 LMatrix4d::translate_mat(_point_a);
82 }
83}
84
85/**
86 * Fills in the information in this record based on the information given in
87 * the indicated datagram, whose opcode has already been read. Returns true
88 * on success, false if the datagram is invalid.
89 */
90bool FltTransformRotateAboutEdge::
91extract_record(FltRecordReader &reader) {
92 if (!FltTransformRecord::extract_record(reader)) {
93 return false;
94 }
95
96 nassertr(reader.get_opcode() == FO_rotate_about_edge, false);
97 DatagramIterator &iterator = reader.get_iterator();
98
99 iterator.skip_bytes(4); // Undocumented additional padding.
100
101 _point_a[0] = iterator.get_be_float64();
102 _point_a[1] = iterator.get_be_float64();
103 _point_a[2] = iterator.get_be_float64();
104 _point_b[0] = iterator.get_be_float64();
105 _point_b[1] = iterator.get_be_float64();
106 _point_b[2] = iterator.get_be_float64();
107 _angle = iterator.get_be_float32();
108
109 iterator.skip_bytes(4); // Undocumented additional padding.
110
111 recompute_matrix();
112
113 check_remaining_size(iterator);
114 return true;
115}
116
117/**
118 * Fills up the current record on the FltRecordWriter with data for this
119 * record, but does not advance the writer. Returns true on success, false if
120 * there is some error.
121 */
122bool FltTransformRotateAboutEdge::
123build_record(FltRecordWriter &writer) const {
124 if (!FltTransformRecord::build_record(writer)) {
125 return false;
126 }
127
128 writer.set_opcode(FO_rotate_about_edge);
129 Datagram &datagram = writer.update_datagram();
130
131 datagram.pad_bytes(4); // Undocumented additional padding.
132
133 datagram.add_be_float64(_point_a[0]);
134 datagram.add_be_float64(_point_a[1]);
135 datagram.add_be_float64(_point_a[2]);
136 datagram.add_be_float64(_point_b[0]);
137 datagram.add_be_float64(_point_b[1]);
138 datagram.add_be_float64(_point_b[2]);
139 datagram.add_be_float32(_angle);
140
141 datagram.pad_bytes(4); // Undocumented additional padding.
142
143 return true;
144}
A class to retrieve the individual data elements previously stored in a Datagram.
void skip_bytes(size_t size)
Skips over the indicated number of bytes in the datagram.
PN_float32 get_be_float32()
Extracts a 32-bit big-endian single-precision floating-point number.
PN_float64 get_be_float64()
Extracts a 64-bit big-endian floating-point number.
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition datagram.h:38
void add_be_float32(PN_float32 value)
Adds a 32-bit single-precision big-endian floating-point number to the datagram.
Definition datagram.I:200
void add_be_float64(PN_float64 value)
Adds a 64-bit big-endian floating-point number to the datagram.
Definition datagram.I:209
void pad_bytes(size_t size)
Adds the indicated number of zero bytes to the datagram.
Definition datagram.cxx:99
This is the first bead in the file, the top of the bead hierarchy, and the primary interface to readi...
Definition fltHeader.h:44
This class turns an istream into a sequence of FltRecords by reading a sequence of Datagrams and extr...
FltOpcode get_opcode() const
Returns the opcode associated with the current record.
DatagramIterator & get_iterator()
Returns an iterator suitable for extracting data from the current record.
This class writes a sequence of FltRecords to an ostream, handling opcode and size counts properly.
void set_opcode(FltOpcode opcode)
Sets the opcode associated with the current record.
Datagram & update_datagram()
Returns a modifiable reference to the datagram associated with the current record.
void check_remaining_size(const DatagramIterator &di, const std::string &name=std::string()) const
Checks that the iterator has no bytes left, as it should at the end of a successfully read record.
A base class for a number of types of ancillary records that follow beads and indicate some kind of a...
PN_stdfloat get_angle() const
Returns the angle of rotation, in degrees counterclockwise about the axis as seen from point a.
void set(const LPoint3d &point_a, const LPoint3d &point_b, PN_stdfloat angle)
Defines the rotation.
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.