Creating the interactor

HandleDraw

  void                
  TSRTBoxFeedbacker::HandleDraw (TGrafPort& port) const
  {
      TGRect bounds = HandleGetBounds ();
      
      port.Draw (bounds);
  
      // We set the inset equal to at least 5x5 in case the graphic is too small to be visible
      GCoordinate hInset = Max(bounds.GetWidth() / 6.0, 5.0);
      GCoordinate vInset = Max(bounds.GetHeight() / 6.0, 5.0);
      
      bounds.Inset (TGPoint(hInset,0));
      port.Draw (bounds);
      
      bounds.Inset (TGPoint(-hInset,vInset));
      port.Draw (bounds);
  }

  // Copyright (C) 1995 Taligent, Inc. All rights reserved.
  TCanvasInteractor*
  TSRTBoxFeedbacker::HandleCreateInteractor 
  (MCanvasSelection* adoptTarget, MToolHandler* handler, const TGPoint& point) const
  {   
      TGRect bounds = HandleGetBounds ();
      TGPoint center = bounds.GetCenter();
      GCoordinate hInset = Max(bounds.GetWidth() / 6.0, 5.0);
      GCoordinate vInset = Max(bounds.GetHeight() / 6.0, 5.0);
      
      // Translating case (center)
      bounds.Inset (TGPoint(hInset,vInset));
      if ( bounds.Contains(point) ) return CreateTranslatingInteractor (adoptTarget, handler);
      
      // Rotating cases (allow overlap with center which has already been ruled out)
      bounds.Inset (TGPoint(-hInset,0));
      if ( bounds.Contains(point) ) return CreateRotatingInteractor (adoptTarget, handler, center);
      
      bounds.Inset (TGPoint(hInset,-vInset));
      if ( bounds.Contains(point) ) return CreateRotatingInteractor (adoptTarget, handler, center);
      
      // Scaling case - all remaining points (the four corners)
      bounds.Inset (TGPoint(-hInset,0));
      if ( bounds.Contains(point) ) {
          // Now, depending on which corner the point is in, 
          // return a scale center point equivalent
          // to the opposite corner.  This pinpoints the scale origin.
          TGRect inner = bounds;
          inner.Inset (TGPoint(hInset,vInset));
          TGRect topLeft = TGRect(bounds.GetTopLeft(), inner.GetTopLeft());
          TGRect topRight = TGRect(TGPoint(inner.GetTopRight().fX, bounds.GetTopRight().fY), 
                      TGPoint(bounds.GetTopRight().fX, inner.GetTopRight().fY));
          TGRect bottomLeft = TGRect(TGPoint(bounds.GetBottomLeft().fX, inner.GetBottomLeft().fY), 
                      TGPoint(inner.GetBottomLeft().fX, bounds.GetBottomLeft().fY));
          TGRect bottomRight = TGRect(inner.GetBottomRight(), bounds.GetBottomRight());
          if (topLeft.Contains(point)) center = inner.GetBottomRight();
          if (topRight.Contains(point)) center = inner.GetBottomLeft();
          if (bottomLeft.Contains(point)) center = inner.GetTopRight();
          if (bottomRight.Contains(point)) center = inner.GetTopLeft();
          return CreateScalingInteractor (adoptTarget, handler, center);
      }
      delete adoptTarget;
      return NIL;
  }