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verticescomp(3u) [debian man page]

VerticesComp(3U)					    InterViews Reference Manual 					  VerticesComp(3U)

NAME

       VerticesComp,  VerticesView,  PSVertices  -  abstract base classes for vertexed graphical component subjects and their views and PostScript
       external representations

SYNOPSIS

       #include <Unidraw/Components/vertices.h>

DESCRIPTION

       VerticesComp is an abstract base class for graphical components whose geometry can be expressed	as  a  list  of  coordinate  pairs.   Ver-
       ticesComp  uses	a  Vertices  graphic to store its graphical attributes.  VerticesView is an abstract GraphicView subclass for displaying a
       VerticesComp. PSVertices is an abstract PostScriptView for subclasses that externalize VerticesComp information in PostScript form.

VERTICESCOMP PUBLIC OPERATIONS

       Vertices* GetVertices()
	      Return the Vertices graphic that defines the vertices's attributes.  GetVertices is simply a more specific form  of  the	GetGraphic
	      operation.

VERTICESCOMP PROTECTED OPERATIONS

       VerticesComp(Vertices* = nil)
	      The constructor takes an optional vertices graphic that defines the component's graphical attributes.

VERTICESVIEW PUBLIC OPERATIONS

       virtual void Interpret(Command*)
	      VerticesView interprets AlignToGridCmd to align its first vertex to the grid.

       virtual void GetVertices(Coord*& x, Coord*& y, int& count)
	      Return the view's vertices in canvas coordinates.  GetVertices allocates new arrays each time it is called.

       VerticesComp* GetVerticesComp()
	      Return the subject.

VERTICESVIEW PROTECTED OPERATIONS

       VerticesView(VerticesComp* = nil)
	      Initialize a VerticesView, optionally supplying the subject.

       virtual void CreateHandles()
	      VerticesView redefines CreateHandles to create a RubberHandles object that draws a handle coinciding with each vertex.

       virtual boolean VertexChanged()
	      Returns  whether	or  not  the vertices as stored in the view are different in any way from those stored in the subject.	The Update
	      function relies on the result to determine whether to  recreate  the  view's  structured	graphic  based	on  the  subject's.   Ver-
	      ticesView::VertexChanged (conservatively) returns false by default; subclasses should redefine this function to make a more discern-
	      ing decision, thereby increasing the efficiency of the update operation.

PSVERTICES PROTECTED OPERATIONS

       PSVertices(VerticesComp* = nil)
	      Initialize a PostScript external representation of the given subject, if any.

       virtual const char* Name()
	      Subclasses should redefine Name to return the proper tag for the object in the PostScript output as required for	idraw  compatibil-
	      ity.

SEE ALSO

       GraphicComp(3U), GraphicView(3U), Grid(3U), PatternCmd(3U), PostScriptView(3U), Vertices(3U), align(3U), idraw(3I)

Unidraw 							  23 January 1991						  VerticesComp(3U)

Check Out this Related Man Page

Vertices(3U)						    InterViews Reference Manual 					      Vertices(3U)

NAME

       Vertices - abstract base class for graphics defined by a set of coordinate pairs

SYNOPSIS

       #include <Unidraw/Graphic/verts.h>

DESCRIPTION

       Vertices is an abstract base class for graphics such as polygons and splines whose geometry is specified by a set of coordinate pairs.  The
       Vertices class supports vertex-related operations common to all such graphical objects and also supports extent caching.

PUBLIC OPERATIONS

       virtual ~Vertices()
	      The destructor deallocates the list of coordinate pairs stored in the graphic.

       virtual int GetOriginal(const Coord*& x, const Coord*& y)
	      Return pointers to the arrays of Coords stored internally that define the graphic's vertices.  GetOriginal's return  value  reflects
	      the size of the arrays.

       virtual boolean operator == (Vertices&)
       virtual boolean operator != (Vertices&)
	      Compare this to the given Vertices instance and return whether they (do not) store identical sets of vertices.

PROTECTED OPERATIONS

       Vertices(Graphic* = nil)
       Vertices(Coord* x, Coord* y, int count, Graphic* = nil)
	      The  constructors are protected to disallow instantiation of the abstract class.	Subclasses can pass a set of vertices to copy into
	      internal storage and an optional graphic from which to obtain an initial set of graphics state.  Vertices  itself  stores  no  addi-
	      tional graphics state over that in the Graphic base class.

       void s_getExtent(
	   float&, float&, float&, float&, float&, Graphic*
       )

       void f_getExtent(
	   float&, float&, float&, float&, float&, Graphic*
       )
	      Helper  functions  that return extent information based on the bounding box that the vertices define.  s_getExtent returns an extent
	      that accounts for the width of a brush, as would be necessary if the vertices defined a stroked path, while f_getExtent assumes that
	      the  vertices  define the graphic's extremities, as would be the case if the vertices defined a filled path.  These operations cache
	      the extent they compute initially.

SEE ALSO

       Graphic(3U)

Unidraw 							  2 February 1991						      Vertices(3U)
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