root/OpenSceneGraph/trunk/include/osg/MatrixTransform @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSG_MATRIXTRANSFORM
15#define OSG_MATRIXTRANSFORM 1
16
17#include <osg/Transform>
18
19namespace osg {
20
21/** MatrixTransform - is a subclass of Transform which has an osg::Matrix
22  * which represents a 4x4 transformation of its children from local coordinates
23  * into the Transform's parent coordinates.
24*/
25class OSG_EXPORT MatrixTransform : public Transform
26{
27    public :
28
29
30        MatrixTransform();
31
32        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
33        MatrixTransform(const MatrixTransform&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
34
35        MatrixTransform(const Matrix& matix);
36
37        META_Node(osg, MatrixTransform);
38
39        virtual MatrixTransform* asMatrixTransform() { return this; }
40        virtual const MatrixTransform* asMatrixTransform() const { return this; }
41
42
43        /** Set the transform's matrix.*/
44        void setMatrix(const Matrix& mat) { _matrix = mat; _inverseDirty=true; dirtyBound(); }
45
46        /** Get the matrix. */
47        inline const Matrix& getMatrix() const { return _matrix; }
48
49        /** pre multiply the transform's matrix.*/
50        void preMult(const Matrix& mat) { _matrix.preMult(mat); _inverseDirty=true; dirtyBound(); }
51
52        /** post multiply the transform's matrix.*/
53        void postMult(const Matrix& mat)  { _matrix.postMult(mat); _inverseDirty=true; dirtyBound(); }
54
55        /** Get the inverse matrix. */
56        inline const Matrix& getInverseMatrix() const
57        {
58            if (_inverseDirty)
59            {
60                _inverse.invert(_matrix);
61                _inverseDirty = false;
62            }
63            return _inverse;
64        }
65
66        virtual bool computeLocalToWorldMatrix(Matrix& matrix,NodeVisitor*) const;
67
68        virtual bool computeWorldToLocalMatrix(Matrix& matrix,NodeVisitor*) const;
69
70
71    protected :
72
73        virtual ~MatrixTransform();
74
75        Matrix                              _matrix;
76        mutable Matrix                      _inverse;
77        mutable bool                        _inverseDirty;
78
79
80};
81
82}
83
84#endif
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