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fltTransformScale.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 fltTransformScale.cxx
10 * @author drose
11 * @date 2000-08-30
12 */
13
14#include "fltTransformScale.h"
15#include "fltRecordReader.h"
16#include "fltRecordWriter.h"
17
18TypeHandle FltTransformScale::_type_handle;
19
20/**
21 *
22 */
23FltTransformScale::
24FltTransformScale(FltHeader *header) : FltTransformRecord(header) {
25 _center.set(0.0, 0.0, 0.0);
26 _scale.set(1.0, 1.0, 1.0);
27}
28
29/**
30 * Defines the scale.
31 */
33set(const LPoint3d &center, const LVecBase3 &scale) {
34 _center = center;
35 _scale = scale;
36
37 recompute_matrix();
38}
39
40/**
41 * Returns true if the center is specified, false if it is not. For some
42 * reason, MultiGen stores large negative numbers in for the center if it is
43 * not specified. It is unclear what the purpose of this is.
44 */
46has_center() const {
47 return
48 _center[0] > -1e+08 &&
49 _center[1] > -1e+08 &&
50 _center[2] > -1e+08;
51}
52
53/**
54 *
55 */
56const LPoint3d &FltTransformScale::
57get_center() const {
58 return _center;
59}
60
61/**
62 *
63 */
64const LVecBase3 &FltTransformScale::
65get_scale() const {
66 return _scale;
67}
68
69/**
70 *
71 */
72void FltTransformScale::
73recompute_matrix() {
74 if (has_center()) {
75 _matrix =
76 LMatrix4d::translate_mat(-_center) *
77 LMatrix4d::scale_mat(LCAST(double, _scale)) *
78 LMatrix4d::translate_mat(_center);
79 } else {
80 _matrix =
81 LMatrix4d::scale_mat(LCAST(double, _scale));
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 FltTransformScale::
91extract_record(FltRecordReader &reader) {
92 if (!FltTransformRecord::extract_record(reader)) {
93 return false;
94 }
95
96 nassertr(reader.get_opcode() == FO_scale, false);
97 DatagramIterator &iterator = reader.get_iterator();
98
99 iterator.skip_bytes(4);
100
101 _center[0] = iterator.get_be_float64();
102 _center[1] = iterator.get_be_float64();
103 _center[2] = iterator.get_be_float64();
104 _scale[0] = iterator.get_be_float32();
105 _scale[1] = iterator.get_be_float32();
106 _scale[2] = iterator.get_be_float32();
107
108 iterator.skip_bytes(4); // Undocumented additional padding.
109
110 recompute_matrix();
111
112 check_remaining_size(iterator);
113 return true;
114}
115
116/**
117 * Fills up the current record on the FltRecordWriter with data for this
118 * record, but does not advance the writer. Returns true on success, false if
119 * there is some error.
120 */
121bool FltTransformScale::
122build_record(FltRecordWriter &writer) const {
123 if (!FltTransformRecord::build_record(writer)) {
124 return false;
125 }
126
127 writer.set_opcode(FO_scale);
128 Datagram &datagram = writer.update_datagram();
129
130 datagram.pad_bytes(4); // Undocumented additional padding.
131
132 datagram.add_be_float64(_center[0]);
133 datagram.add_be_float64(_center[1]);
134 datagram.add_be_float64(_center[2]);
135 datagram.add_be_float32(_scale[0]);
136 datagram.add_be_float32(_scale[1]);
137 datagram.add_be_float32(_scale[2]);
138
139 datagram.pad_bytes(4); // Undocumented additional padding.
140
141 return true;
142}
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...
bool has_center() const
Returns true if the center is specified, false if it is not.
void set(const LPoint3d &center, const LVecBase3 &scale)
Defines the scale.
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.