ON_Plane::ON_Plane(
const ON_3dPoint& P, // point on the plane
const ON_3dVector& X, // non-zero vector in plane
const ON_3dVector& Y // another vector in the plane not parallel to X
)
{
CreateFromFrame(P,X,Y);
}
bool ON_Plane::Transform( const ON_Xform& xform )
{
ON_3dPoint origin_pt = xform*origin;
// use care tranforming vectors
ON_3dVector xaxis_vec = (xform*(origin+xaxis)) - origin_pt;
ON_3dVector yaxis_vec = (xform*(origin+yaxis)) - origin_pt;
return CreateFromFrame( origin_pt, xaxis_vec, yaxis_vec );
}
bool ON_Plane::Transform( const ON_Xform& xform )
{
if ( xform.IsIdentity() )
{
// 27 October 2011 Dale Lear
// If the plane is valid and the transformation
// is the identity, then NO changes should be
// made to the plane's values. In particular
// calling CreateFromFrame() can introduce
// slight fuzz.
//
// Please discuss any changes with me.
return IsValid();
}
ON_3dPoint origin_pt = xform*origin;
// use care tranforming vectors
ON_3dVector xaxis_vec = (xform*(origin+xaxis)) - origin_pt;
ON_3dVector yaxis_vec = (xform*(origin+yaxis)) - origin_pt;
return CreateFromFrame( origin_pt, xaxis_vec, yaxis_vec );
}
