Example

The following sample code demonstrates how rotate objects around the center point of their bounding box using the Rhino SDK.

  CRhinoCommand::result CCommandTest::RunCommand( const CRhinoCommandContext& context )
  {
    // Select objects to rotate
    CRhinoGetObject go;
    go.SetCommandPrompt( L"Select objects to rotate" );
    go.GetObjects( 1, 0 );
    if( go.CommandResult() != success )
      return go.CommandResult();


    // Rotation angle (in degrees)
    CRhinoGetNumber gn;
    gn.SetCommandPrompt( L"Rotation angle" );
    gn.SetDefaultNumber( m_angle );
    gn.GetNumber();
    if( gn.CommandResult() != success )
      return gn.CommandResult();


    // Validate input
    double angle = gn.Number();
    if( angle == 0 )
      return nothing;


    m_angle = angle;


    // Get the active view's construction plane
    ON_Plane plane = RhinoActiveCPlane();


    // Do not split objects that get kinky 
    // when they are transformed.
    CRhinoKeepKinkySurfaces keep_kinky_srfs;


    int i;
    for( i = 0; i < go.ObjectCount(); i++ )
    {
      // Get an object reference
      const CRhinoObjRef& ref = go.Object(i);


      // Get the real object
      const CRhinoObject* obj = ref.Object();
      if( !obj )
        continue;


      // Get the object's tight bounding box
      ON_BoundingBox bbox;
      if( !obj->GetTightBoundingBox(bbox, false, 0) )
        continue;


      // Create transformation matrix
      ON_Xform xform;
      xform.Rotation( m_angle * ON_PI / 180.0, plane.zaxis, bbox.Center() );


      // Transform the object
      context.m_doc.TransformObject( obj, xform, true, true, true );
    }


    context.m_doc.Redraw();


    return success;
  }