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+// Filename: compassEffect.cxx
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+// Created by: drose (16Jul02)
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+//
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+////////////////////////////////////////////////////////////////////
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+//
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+// PANDA 3D SOFTWARE
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+// Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved
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+//
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+// All use of this software is subject to the terms of the Panda 3d
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+// Software license. You should have received a copy of this license
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+// along with this source code; you will also find a current copy of
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+// the license at http://www.panda3d.org/license.txt .
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+//
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+// To contact the maintainers of this program write to
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+// [email protected] .
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+//
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+////////////////////////////////////////////////////////////////////
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+
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+#include "compassEffect.h"
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+#include "config_pgraph.h"
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+#include "nodePath.h"
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+#include "bamReader.h"
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+#include "bamWriter.h"
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+#include "datagram.h"
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+#include "datagramIterator.h"
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+
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+TypeHandle CompassEffect::_type_handle;
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::make
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+// Access: Published, Static
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+// Description: Constructs a new CompassEffect object.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderEffect) CompassEffect::
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+make(const NodePath &reference) {
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+ CompassEffect *effect = new CompassEffect;
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+ effect->_reference = reference;
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+ return return_new(effect);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::safe_to_transform
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+// Access: Public, Virtual
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+// Description: Returns true if it is generally safe to transform
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+// this particular kind of RenderEffect by calling the
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+// xform() method, false otherwise.
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+////////////////////////////////////////////////////////////////////
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+bool CompassEffect::
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+safe_to_transform() const {
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+ return false;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::output
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+void CompassEffect::
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+output(ostream &out) const {
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+ if (!_reference.is_empty()) {
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+ RenderEffect::output(out);
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+ } else {
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+ out << get_type() << ":";
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+ if (!_reference.is_empty()) {
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+ out << " reference " << _reference;
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+ }
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+ }
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::do_compass
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+// Access: Public
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+// Description: Computes the appropriate transform to rotate the node
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+// according to the reference node, or to the root
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+// transform if there is no reference node.
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+////////////////////////////////////////////////////////////////////
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+CPT(TransformState) CompassEffect::
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+do_compass(const TransformState *net_transform,
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+ const TransformState *node_transform) const {
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+ if (!net_transform->has_components() || !node_transform->has_quat()) {
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+ // If we don't have a decomposable transform, we can't do anything here.
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+ pgraph_cat.warning()
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+ << "CompassEffect unable to adjust non-decomposable transform\n";
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+ return TransformState::make_identity();
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+ }
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+
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+ // Compute just the rotation part of the transform we want.
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+ CPT(TransformState) want_rot = TransformState::make_identity();
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+ if (!_reference.is_empty()) {
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+ CPT(TransformState) rel_transform = _reference.get_net_transform();
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+ if (!rel_transform->has_quat()) {
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+ pgraph_cat.warning()
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+ << "CompassEffect unable to reference non-decomposable transform\n";
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+ } else {
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+ want_rot = TransformState::make_quat(rel_transform->get_quat());
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+ }
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+ }
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+
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+ want_rot =
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+ want_rot->compose(TransformState::make_quat(node_transform->get_quat()));
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+
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+ // Now compute the net transform we want to achieve. This is the
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+ // same as the net transform we were given, except the rotation
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+ // component is replaced by our desired rotation.
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+ CPT(TransformState) want_transform =
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+ TransformState::make_pos_quat_scale(net_transform->get_pos(),
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+ want_rot->get_quat(),
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+ net_transform->get_scale());
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+
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+ // Now compute the transform that will convert net_transform to
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+ // want_transform. This is inv(net_transform) * want_transform.
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+ return net_transform->invert_compose(want_transform);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::compare_to_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived CompassEffect
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+// types to return a unique number indicating whether
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+// this CompassEffect is equivalent to the other one.
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+//
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+// This should return 0 if the two CompassEffect objects
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+// are equivalent, a number less than zero if this one
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+// should be sorted before the other one, and a number
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+// greater than zero otherwise.
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+//
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+// This will only be called with two CompassEffect
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+// objects whose get_type() functions return the same.
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+////////////////////////////////////////////////////////////////////
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+int CompassEffect::
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+compare_to_impl(const RenderEffect *other) const {
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+ const CompassEffect *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+
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+ int compare = _reference.compare_to(ta->_reference);
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+ if (compare != 0) {
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+ return compare;
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+ }
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+ return 0;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::make_default_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived CompassEffect
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+// types to specify what the default property for a
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+// CompassEffect of this type should be.
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+//
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+// This should return a newly-allocated CompassEffect of
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+// the same type that corresponds to whatever the
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+// standard default for this kind of CompassEffect is.
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+////////////////////////////////////////////////////////////////////
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+RenderEffect *CompassEffect::
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+make_default_impl() const {
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+ return new CompassEffect;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::register_with_read_factory
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+// Access: Public, Static
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+// Description: Tells the BamReader how to create objects of type
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+// CompassEffect.
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+////////////////////////////////////////////////////////////////////
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+void CompassEffect::
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+register_with_read_factory() {
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+ BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::write_datagram
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+// Access: Public, Virtual
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+// Description: Writes the contents of this object to the datagram
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+// for shipping out to a Bam file.
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+////////////////////////////////////////////////////////////////////
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+void CompassEffect::
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+write_datagram(BamWriter *manager, Datagram &dg) {
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+ RenderEffect::write_datagram(manager, dg);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::make_from_bam
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+// Access: Protected, Static
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+// Description: This function is called by the BamReader's factory
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+// when a new object of type CompassEffect is encountered
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+// in the Bam file. It should create the CompassEffect
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *CompassEffect::
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+make_from_bam(const FactoryParams ¶ms) {
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+ CompassEffect *effect = new CompassEffect;
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+ DatagramIterator scan;
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+ BamReader *manager;
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+
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+ parse_params(params, scan, manager);
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+ effect->fillin(scan, manager);
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+
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+ return effect;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: CompassEffect::fillin
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+// Access: Protected
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+// Description: This internal function is called by make_from_bam to
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+// read in all of the relevant data from the BamFile for
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+// the new CompassEffect.
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+////////////////////////////////////////////////////////////////////
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+void CompassEffect::
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+fillin(DatagramIterator &scan, BamReader *manager) {
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+ RenderEffect::fillin(scan, manager);
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+}
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David Rose