PinComp, PinView, PinGraphic, PSPin - pin connector subject, view, structured graphic, and PostScript

       PinComp is a Connector subclass that supports connectivity with zero  degrees  of  freedom.   It  uses  a
       PinGraphic to store its graphical attributes.  PinView is a GraphicView for displaying the pin.  PSPin is
       a PostScriptView that externalizes the subject's information in PostScript form.

       SlidingPin and FixedPin are special rubberbands used to implement the animation effects that pins produce
       during  direct  manipulation.   A SlidingPin is a circle with crosshairs (duplicating the appearance of a
       PinGraphic) that follows the mouse position, while a FixedPin draws a static circle with crosshairs.

       PinComp,  PinView,  PinGraphic,  PSPin  - pin connector subject, view, structured graphic, and PostScript
       external representation

       SlidingPin, FixedPin - rubberbands used in pin manipulation

PinComp(PinGraphic*=nil)
              The constructor takes an optional PinGraphic that defines the pin's graphical attributes.  The pad
              has fixed mobility initially

       virtualvoidInterpret(Command*)virtualvoidUninterpret(Command*)
              PinComp (un)interprets a subset of  commands  that  connectors  can  generally  interpret,  namely
              MoveCmd, BrushCmd, AlignCmd, MobilityCmd, DeleteCmd, and CutCmd.

       virtualMobilityGetMobility()virtualvoidSetMobility(Mobility)
              PinComp  redefines  these  functions to return and assign its _mobility protected member.  The pin
              has fixed mobility initially.

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

PinGraphic(Coord=0,Coord=0,Graphic*=nil)
              Create a PinGraphic, optionally specifying its center and a  graphic  from  which  to  obtain  its
              default graphics attributes.

       voidGetOriginal(Coord&,Coord&)
              Return the PinGraphic's original center coordinates as specified in the constructor.

PinGraphic*GetPin()
              Return the PinGraphic that defines the pin's attributes.  GetPin is simply a more specific form of
              the GetGraphic operation.

       virtualPinComp*NewSubject(PinGraphic*)
              A  helper  function  that  creates  a  PinComp  subject  with the given pin graphic. This function
              produces the proper subject when the GraphicCompTool's manipulator is interpreted.  Subclasses can
              redefine this operation to return a PinComp subclass, thus eliminating  the  need  to  reimplement
              InterpretManipulator.

       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.

PinView(PinComp*=nil)
              Create an PinView, optionally supplying the subject.

       virtualvoidInterpret(Command*)
              PinView interprets AlignToGridCmd to align its lower left to the grid.

       virtualManipulator*CreateManipulator(Viewer*,Event&,Transformer*,Tool*)virtualvoidInterpretManipulator(Manipulator*)
              PinViews  respond  only to manipulation by GraphicCompTools, MoveTools, and ConnectTools.  PinView
              inherits its MoveTool response from ConnectorView.  GraphicCompTool will let the  user  place  the
              pin at a particular position.  Placement will be influenced by gravity, if any.  PinView creates a
              ConnectManip  in  response  to  the  ConnectTool,  which  will exhibit a gravational attraction to
              potential target connectors.  PinView will produce a ConnectCmd to connect the pin to its  target.
              A pin connected in this way will receive floating mobility.

       PinComp*GetPinComp()
              Return the subject.

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

BrushCmd(3U),     ConnectTool(3U),     Connector(3U),     ConnectorView3U),    Event(3I),    Graphic(3U),
       GraphicCompTool(3U),   Grid(3U),   MoveTool(3U),   PatternCmd(3U),    PostScriptView(3U),    Rubband(3I),
       Transformer(3I), Viewer(3U), align(3U), edit(3U), manips(3U), transforms(3U)

Unidraw                                          23 January 1991                                     PinComp(3U)

#include<Unidraw/Components/pin.h>