OpenSceneGraph/src/osg/Transform.cpp

#include <osg/Transform>

using namespace osg;

Transform::Transform()
{
    _type = DYNAMIC;
    _mode = MODEL;

    _matrix = new Matrix;
    _inverse = new Matrix;
    _inverseDirty = false;
}

Transform::Transform(const Transform& transform,const CopyOp& copyop):
    Group(transform,copyop),
    _type(transform._type),
    _mode(transform._mode),
    _computeTransformCallback(_computeTransformCallback),
    _matrix(new Matrix(*transform._matrix)),
    _inverse(new Matrix(*transform._inverse)),
    _inverseDirty(transform._inverseDirty)
{    
}

Transform::Transform(const Matrix& mat )
{
    _type = DYNAMIC;
    _mode = MODEL;

    _matrix = new Matrix(mat);
    _inverse = new Matrix();
    _inverseDirty = false;
}


Transform::~Transform()
{
}

const bool Transform::computeBound() const
{
    if (!Group::computeBound()) return false;
    
    // note, NULL pointer for NodeVisitor, so compute's need
    // to handle this case gracefully, normally this should not be a problem.
    Matrix l2w;
    if (_mode!=PROJECTION && getLocalToWorldMatrix(l2w,NULL))
    {

        Vec3 xdash = _bsphere._center;
        xdash.x() += _bsphere._radius;
        xdash = xdash*l2w;

        Vec3 ydash = _bsphere._center;
        ydash.y() += _bsphere._radius;
        ydash = ydash*l2w;

        Vec3 zdash = _bsphere._center;
        zdash.y() += _bsphere._radius;
        zdash = zdash*l2w;

        _bsphere._center = _bsphere._center*l2w;

        xdash -= _bsphere._center;
        float len_xdash = xdash.length();

        ydash -= _bsphere._center;
        float len_ydash = ydash.length();

        zdash -= _bsphere._center;
        float len_zdash = zdash.length();

        _bsphere._radius = len_xdash;
        if (_bsphere._radius<len_ydash) _bsphere._radius = len_ydash;
        if (_bsphere._radius<len_zdash) _bsphere._radius = len_zdash;

        return true;
    }
    else
    {
        _bsphere.init();
        return false;
    }
}