NAME

       SplineComp,  SplineView,  PSSpline,  ClosedSplineComp,  ClosedSplineView, PSClosedSpline -
       open and closed spline component subjects, views, and PostScript external representations

SYNOPSIS

       #include <Unidraw/Components/spline.h>

DESCRIPTION

       SplineComp and ClosedSplineComp are VerticesComps that define  open  and  closed  splines,
       respectively.    SplineComp  uses  an  SFH_OpenBSpline  graphic  to  store  its  graphical
       attributes,  while   ClosedSplineComp   uses   an   SFH_ClosedBSpline.    SplineView   and
       ClosedSplineView  are  VerticesViews for displaying open and closed splines.  PSSpline and
       PSClosedSpline are PSVertices that externalize their subject's information  in  PostScript
       form.

SPLINECOMP PUBLIC OPERATIONS

       SplineComp(SFH_OpenBSpline* = nil)
              The  constructor  takes an optional control point hit-detecting stroked-filled open
              B-spline graphic that defines the attributes of the spline.

       SFH_OpenBSpline* GetSpline()
              Return the SFH_OpenBSpline graphic that defines the spline's attributes.  GetSpline
              is simply a more specific form of the GetGraphic operation.

SPLINEVIEW PUBLIC OPERATIONS

       SplineView(SplineComp* = nil)
              Create a SplineView, optionally supplying the subject.

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

       virtual void InterpretManipulator(Manipulator*)
              SplineView redefines its response to manipulation with a GraphicCompTool.  The user
              clicks the left mouse button to specify each vertex  and  clicks  with  the  middle
              mouse  button  to specify the final vertex.  Vertex positioning will be constrained
              by gravity, if any.   SplineView  also  defines  a  response  to  the  ReshapeTool,
              allowing  the  user  to  click  on one of its control points to reposition it.  The
              subject is actually  replaced  (via  ReplaceCmd)  with  a  new  SplineComp  subject
              reflecting  the  repositioned  control  point.  Repositioning will be influenced by
              gravity.

       SplineComp* GetSplineComp()
              Return the subject.

PSSPLINE PUBLIC OPERATIONS

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

PSSPLINE PROTECTED OPERATIONS

       virtual const char* Name()
              PSSpline identifies itself as "BSpl" in the PostScript output.

CLOSEDSPLINECOMP PUBLIC OPERATIONS

       ClosedSplineComp(SFH_ClosedBSpline* = nil)
              The constructor takes an optional control point hit-detecting stroked-filled closed
              B-spline graphic that defines the attributes of the closed spline.

       SFH_ClosedBSpline* GetClosedSpline()
              Return  the  SFH_ClosedBSpline graphic that defines the closed spline's attributes.
              GetClosedSpline is simply a more specific form of the GetGraphic operation.

CLOSEDSPLINEVIEW PUBLIC OPERATIONS

       ClosedSplineView(ClosedSplineComp* = nil)
              Create a ClosedSplineView, optionally supplying the subject.

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

       virtual void InterpretManipulator(Manipulator*)
              ClosedSplineView redefines its response to  manipulation  with  a  GraphicCompTool.
              The  user  clicks  the left mouse button to specify each vertex and clicks with the
              middle mouse button to specify  the  final  vertex.   Vertex  positioning  will  be
              constrained  by  gravity,  if any.  ClosedSplineView also defines a response to the
              ReshapeTool, allowing the user to click on one of its control points to  reposition
              it.   The subject is actually replaced (via ReplaceCmd) with a new ClosedSplineComp
              subject  reflecting  the  repositioned  control  point.   Repositioning   will   be
              influenced by gravity.

       ClosedSplineComp* GetClosedSplineComp()
              Return the subject.

PSCLOSEDSPLINE PUBLIC OPERATIONS

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

PSCLOSEDSPLINE PROTECTED OPERATIONS

       virtual const char* Name()
              PSClosedSpline identifies itself as "CBSpl" in the PostScript output.

SEE ALSO

       Event(3I),     GraphicComp(3U),     GraphicCompTool(3U),     GraphicView(3U),    Grid(3U),
       PatternCmd(3U),   PostScriptView(3U),   ReshapeTool(3U),   Rubband(3I),   Transformer(3I),
       VerticesComp(3U), Viewer(3U), align(3U), edit(3U), splines(3U)