84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_AUTOTRANSFORM
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#define OSG_AUTOTRANSFORM 1
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#include <osg/Group>
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#include <osg/Matrix>
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namespace osg {
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/** AutoTransform - is group which all children
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* are transformed by a matrix which is automatically
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* calculated during the cull traversal. The routine to
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* do the matrix transform is specified by the user allow
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* them customize its behavior to their own requirements.
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*/
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class SG_EXPORT AutoTransform : public Group
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{
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public :
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class CalcTransformCallback : public osg::Referenced
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{
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public:
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/** Get the transformation matrix which moves from local coords to world coords.*/
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virtual const Matrix getLocalToWorldMatrix(const osg::Matrix& modelview) const = 0;
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/** Get the transformation matrix which moves from world coords to local coords.*/
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virtual const Matrix getWorldToLocalMatrix(const osg::Matrix& modelview) const = 0;
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protected:
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virtual ~CalcTransformCallback() {}
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};
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AutoTransform();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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AutoTransform(const AutoTransform&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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AutoTransform(const Matrix& matix);
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META_Node(AutoTransform);
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/** Get the transformation matrix which moves from local coords to world coords.*/
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inline const Matrix getLocalToWorldMatrix(const osg::Matrix& modelview) const
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{
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if (_calcTransformCallback.valid())
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return _calcTransformCallback->getLocalToWorldMatrix(modelview);
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else return osg::Matrix::identity();
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}
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/** Get the transformation matrix which moves from world coords to local coords.*/
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inline const Matrix getWorldToLocalMatrix(const osg::Matrix& modelview) const
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{
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if (_calcTransformCallback.valid())
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return _calcTransformCallback->getLocalToWorldMatrix(modelview);
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else return osg::Matrix::identity();
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}
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protected :
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virtual ~AutoTransform();
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/** Override's Group's computeBound.
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* There is no need to override in subclasses from osg::AutoTransform since this computeBound() uses
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* the underlying matrix (calling computeMatrix if required.) */
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virtual const bool computeBound() const;
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ref_ptr<CalcTransformCallback> _calcTransformCallback;
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};
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}
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#endif
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