open_toontown_panda3d/pandatool/src/flt/fltTransformRotateAboutPoin...

141 lines
3.4 KiB
C++

/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file fltTransformRotateAboutPoint.cxx
* @author drose
* @date 2000-08-30
*/
#include "fltTransformRotateAboutPoint.h"
#include "fltRecordReader.h"
#include "fltRecordWriter.h"
TypeHandle FltTransformRotateAboutPoint::_type_handle;
/**
*
*/
FltTransformRotateAboutPoint::
FltTransformRotateAboutPoint(FltHeader *header) : FltTransformRecord(header) {
_center.set(0.0, 0.0, 0.0);
_axis.set(1.0, 0.0, 0.0);
_angle = 0.0;
}
/**
* Defines the rotation. The angle is given in degrees, counterclockwise
* about the axis as seen from point a.
*/
void FltTransformRotateAboutPoint::
set(const LPoint3d &center, const LVector3 &axis, PN_stdfloat angle) {
_center = center;
_axis = axis;
_angle = angle;
recompute_matrix();
}
/**
*
*/
const LPoint3d &FltTransformRotateAboutPoint::
get_center() const {
return _center;
}
/**
*
*/
const LVector3 &FltTransformRotateAboutPoint::
get_axis() const {
return _axis;
}
/**
* Returns the angle of rotation, in degrees counterclockwise about the axis.
*/
PN_stdfloat FltTransformRotateAboutPoint::
get_angle() const {
return _angle;
}
/**
*
*/
void FltTransformRotateAboutPoint::
recompute_matrix() {
if (_axis == LVector3::zero()) {
// Degenerate case.
_matrix = LMatrix4d::ident_mat();
} else {
LVector3d axis = LCAST(double, _axis);
_matrix =
LMatrix4d::translate_mat(-_center) *
LMatrix4d::rotate_mat(_angle, axis, CS_zup_right) *
LMatrix4d::translate_mat(_center);
}
}
/**
* Fills in the information in this record based on the information given in
* the indicated datagram, whose opcode has already been read. Returns true
* on success, false if the datagram is invalid.
*/
bool FltTransformRotateAboutPoint::
extract_record(FltRecordReader &reader) {
if (!FltTransformRecord::extract_record(reader)) {
return false;
}
nassertr(reader.get_opcode() == FO_rotate_about_point, false);
DatagramIterator &iterator = reader.get_iterator();
iterator.skip_bytes(4); // Undocumented additional padding.
_center[0] = iterator.get_be_float64();
_center[1] = iterator.get_be_float64();
_center[2] = iterator.get_be_float64();
_axis[0] = iterator.get_be_float32();
_axis[1] = iterator.get_be_float32();
_axis[2] = iterator.get_be_float32();
_angle = iterator.get_be_float32();
recompute_matrix();
check_remaining_size(iterator);
return true;
}
/**
* Fills up the current record on the FltRecordWriter with data for this
* record, but does not advance the writer. Returns true on success, false if
* there is some error.
*/
bool FltTransformRotateAboutPoint::
build_record(FltRecordWriter &writer) const {
if (!FltTransformRecord::build_record(writer)) {
return false;
}
writer.set_opcode(FO_rotate_about_point);
Datagram &datagram = writer.update_datagram();
datagram.pad_bytes(4); // Undocumented additional padding.
datagram.add_be_float64(_center[0]);
datagram.add_be_float64(_center[1]);
datagram.add_be_float64(_center[2]);
datagram.add_be_float32(_axis[0]);
datagram.add_be_float32(_axis[1]);
datagram.add_be_float32(_axis[2]);
datagram.add_be_float32(_angle);
return true;
}