PadComp,  PadView,  PadGraphic, PSPad - pad connector sub-
       ject, view, structured graphic,  and  PostScript  external
       representation

SYNOPSIS

       #include <Unidraw/Components/pad.h>

DESCRIPTION

       PadComp is a Connector subclass that supports connectivity
       with two degrees of freedom.   It  uses  a  PadGraphic  to
       store  its graphical attributes.  PadView is a GraphicView
       for displaying the pad.  PSPad is  a  PostScriptView  that
       externalizes the subject's information in PostScript form.

PADCOMP PUBLIC OPERATIONS

       PadComp(PadGraphic* = nil)
              The constructor takes an optional  PadGraphic  that
              defines the pad's graphical attributes.

       virtual void Interpret(Command*)
       virtual void Uninterpret(Command*)
              PadComp  (un)interprets  a  subset of commands that
              connectors can generally interpret, namely MoveCmd,
              BrushCmd,  AlignCmd,  MobilityCmd,  DeleteCmd,  and
              CutCmd.

       virtual Mobility GetMobility()
       virtual void SetMobility(Mobility)
              PadComp redefines these  functions  to  return  and
              assign its _mobility protected member.  The pad has
              fixed mobility initially.

       Pad* GetPad()
              Return the Pad  graphic  that  defines  the  line's
              attributes.   GetPad is simply a more specific form
              of the GetGraphic operation.

PADVIEW PUBLIC OPERATIONS

       PadView(PadComp* = nil)
              Create an PadView, optionally  supplying  the  sub-
              ject.

       virtual void Interpret(Command*)
              PadView  interprets  AlignToGridCmd  to  align  its
              lower left to the grid.

       virtual Manipulator* CreateManipulator(
          Viewer*, Event&, Transformer*, Tool*
       )

       virtual void InterpretManipulator(Manipulator*)
              PadViews respond only to manipulation  by  Graphic-
              GraphicCompTool will let the user sweep out a rect-
              angle that reflects the pad's size.  Creation  will
              be influenced by gravity, if any. PadView creates a
              ConnectManip in response to the ConnectTool,  which
              will  exhibit a gravational attraction to potential
              target connectors.  PadView  will  produce  a  Con-
              nectCmd  to  connect  the  pad to its target. A pad
              connected in this way will receive floating  mobil-
              ity.

       PadComp* GetPadComp()
              Return the subject.

PADVIEW PROTECTED OPERATIONS

       PadGraphic* GetPad()
              Return   the  PadGraphic  that  defines  the  pad's
              attributes.  GetPad is simply a more specific  form
              of the GetGraphic operation.

       virtual PadComp* NewSubject(PadGraphic*)
              A  helper  function  that creates a PadComp subject
              with the given pad graphic. This function  produces
              the   proper  subject  when  the  GraphicCompTool's
              manipulator is interpreted.  Subclasses  can  rede-
              fine  this  operation to return a PadComp subclass,
              thus eliminating the need to reimplement Interpret-
              Manipulator.

       Manipulator* CreateGraphicCompManip(
           Viewer*, Event&, Transformer*, Tool*
       )

       Manipulator* CreateConnectManip(
           Viewer*, Event&, Transformer*, Tool*
       )

       Command* InterpretGraphicCompManip(Manipulator*)
       Command* InterpretConnectManip(Manipulator*)
              Helper  functions  used  by  CreateManipulator  and
              InterpretManipulator to create  and  interpret  the
              manipulators  associated  with  GraphicCompTool and
              ConnectTool.

PADGRAPHIC PUBLIC OPERATIONS

       PadGraphic(
           Coord = 0, Coord = 0, Coord = 0, Coord = 0,
           Graphic* = nil
       )
              Create a PadGraphic, optionally  specifying  lower-
              left  and  upper-right  corners  and a graphic from
              which to obtain its default graphics attributes.

              Return the  PadGraphic's  original  coordinates  as
              specified in the constructor.

PSPAD PUBLIC OPERATIONS

       PSPad(PadComp* = nil)
              Construct  a  PostScript external representation of
              the given subject, if any.

SEE ALSO

       BrushCmd(3U),  ConnectTool(3U),   Connector(3U),   Connec-
       torView3U),  Event(3I),  Graphic(3U), GraphicCompTool(3U),
       Grid(3U),          MoveTool(3U),           PatternCmd(3U),
       PostScriptView(3U),      Transformer(3I),      Viewer(3U),
       align(3U), edit(3U), manips(3U), transforms(3U)