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ellipses

ellipses(3U)						    InterViews Reference Manual 					      ellipses(3U)

NAME

       Ellipse,  S_Ellipse,  F_Ellipse,  SF_Ellipse,  S_Circle, F_Circle, SF_Circle - abstract base class and predefined subclasses for elliptical
       structured graphics

SYNOPSIS

       #include <Unidraw/Graphic/ellipses.h>

DESCRIPTION

       Ellipse is an abstract base class for elliptical structured graphics objects.  It stores geometric information that such  graphics  require
       and  provides  helper  functions  for  calculating  extents and for hit detection.  Predefined subclasses include S_Ellipse, F_Ellipse, and
       SF_Ellipse, which draw stroked, filled, and stroked-filled ellipses, respectively;  and	S_Circle,  F_Circle,  and  SF_Circle,  which  draw
       stroked,  filled,  and  stroked-filled circles, respectively.  The stroked subclasses store a PSBrush, the filled subclasses store a PSPat-
       tern, and the stroked-filled subclasses store one of each.

ELLIPSE PUBLIC OPERATIONS

       void GetOriginal(Coord& x, Coord& y, int& rx, int& ry)
	      Return the ellipse's geometry.  (x, y) defines the ellipse's center, while rx and ry  define  its  horizontal  and  vertical  radii,
	      respectively.

ELLIPSE PROTECTED OPERATIONS

       Ellipse(Coord x, Coord y, int rx, int ry, Graphic* = nil)
	      The constructor is protected to disallow instantiation of the abstract base class.  An ellipse's geometry is defined in terms of its
	      center and its horizontal and vertical radii.  The constructor also takes an optional graphic from which to obtain an initial set of
	      graphics state.

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

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

       boolean s_contains(PointObj&, Graphic*)
       boolean f_contains(PointObj&, Graphic*)
       boolean s_intersects(BoxObj&, Graphic*)
       boolean f_intersects(BoxObj&, Graphic*)
	      Helper  functions that return extent and hit detection information based on the bounding box that the ellipse defines.  s_getExtent,
	      s_contains, and s_intersects return information that accounts for the width of a brush, as would be  necessary  if  the  ellipse	is
	      stroked,	while  f_getExtent, f_contains, and f_intersects assumes that the ellipse is filled.  Subclasses can use the operations to
	      help implement their getExtent, contains, and intersects operations.

SUBCLASS PUBLIC OPERATIONS

       S_Ellipse(Coord x, Coord y, int rx, int ry, Graphic* = nil)
       F_Ellipse(Coord x, Coord y, int rx, int ry, Graphic* = nil)
       SF_Ellipse(Coord x, Coord y, int rx, int ry, Graphic* = nil)
       S_Circle(Coord x, Coord y, int radius, Graphic* = nil)
       F_Circle(Coord x, Coord y, int radius, Graphic* = nil)
       SF_Circle(Coord x, Coord y, int radius, Graphic* = nil)
	      Constructors for the various predefined Ellipse subclasses.

SEE ALSO

       Graphic(3U), geomobjs(3U), pspaint(3U)

Unidraw 							  2 February 1991						      ellipses(3U)

UNIX for Advanced & Expert Users