OpenSceneGraph/src/osg/Transform.cpp

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2001-09-20 05:19:47 +08:00
#include "osg/Transform"
using namespace osg;
Transform::Transform()
{
_matrix = new osg::Matrix();
_matrix->makeIdent();
}
Transform::Transform(const Matrix& mat )
{
(*_matrix) = mat;
}
Transform::~Transform()
{
}
void Transform::setMatrix(const Matrix& mat )
{
(*_matrix) = mat;
dirtyBound();
}
void Transform::preMult( const Matrix& mat )
{
_matrix->preMult( mat );
dirtyBound();
}
void Transform::preScale( const float sx, const float sy, const float sz )
{
_matrix->preScale( sx, sy, sz );
dirtyBound();
}
void Transform::preTranslate( const float tx, const float ty, const float tz )
{
_matrix->preTrans( tx, ty, tz );
dirtyBound();
}
void Transform::preRotate( const float deg, const float x, const float y, const float z )
{
_matrix->preRot( deg, x, y, z );
dirtyBound();
}
const bool Transform::computeBound() const
{
if (!Group::computeBound()) return false;
Vec3 xdash = _bsphere._center;
xdash.x() += _bsphere._radius;
xdash = xdash*(*_matrix);
Vec3 ydash = _bsphere._center;
ydash.y() += _bsphere._radius;
ydash = ydash*(*_matrix);
Vec3 zdash = _bsphere._center;
zdash.y() += _bsphere._radius;
zdash = zdash*(*_matrix);
_bsphere._center = _bsphere._center*(*_matrix);
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;
}