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Tk_Get3DBorder(3)	     Tk Library Procedures	     Tk_Get3DBorder(3)

______________________________________________________________________________

NAME
       Tk_Get3DBorder,	Tk_Draw3DRectangle, Tk_Fill3DRectangle, Tk_Draw3DPoly‐
       gon,   Tk_Fill3DPolygon,	  Tk_3DVerticalBevel,	 Tk_3DHorizontalBevel,
       Tk_SetBackgroundFromBorder,     Tk_NameOf3DBorder,    Tk_3DBorderColor,
       Tk_3DBorderGC, Tk_Free3DBorder - draw  borders  with  three-dimensional
       appearance

SYNOPSIS
       #include <tk.h>

       Tk_3DBorder
       Tk_Get3DBorder(interp, tkwin, colorName)

       void
       Tk_Draw3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief)

       void
       Tk_Fill3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief)

       void
       Tk_Draw3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief)

       void
       Tk_Fill3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief)

       void
       Tk_3DVerticalBevel(tkwin, drawable, border, x, y, width, height, leftBevel, relief)

       void
       Tk_3DHorizontalBevel(tkwin, drawable, border, x, y, width, height, leftIn, rightIn, topBevel, relief)

       void
       Tk_SetBackgroundFromBorder(tkwin, border)

       char *
       Tk_NameOf3DBorder(border)

       XColor *
       Tk_3DBorderColor(border)

       GC *
       Tk_3DBorderGC(tkwin, border, which)

       Tk_Free3DBorder(border)

ARGUMENTS
       Tcl_Interp    *interp	   (in)	     Interpreter   to  use  for	 error
					     reporting.

       Tk_Window     tkwin	   (in)	     Token for window (for all	proce‐
					     dures except Tk_Get3DBorder, must
					     be the window for which the  bor‐
					     der was allocated).

       Tk_Uid	     colorName	   (in)	     Textual description of color cor‐
					     responding	 to  background	 (flat
					     areas).   Illuminated  edges will
					     be brighter than this  and	 shad‐
					     owed  edges  will	be darker than
					     this.

       Drawable	     drawable	   (in)	     X token  for  window  or  pixmap;
					     indicates	where  graphics are to
					     be drawn.	Must either be	the  X
					     window for tkwin or a pixmap with
					     the  same	screen	and  depth  as
					     tkwin.

       Tk_3DBorder   border	   (in)	     Token for border previously allo‐
					     cated in call to Tk_Get3DBorder.

       int	     x		   (in)	     X-coordinate of upper-left corner
					     of rectangle describing border or
					     bevel, in pixels.

       int	     y		   (in)	     Y-coordinate of upper-left corner
					     of rectangle describing border or
					     bevel, in pixels.

       int	     width	   (in)	     Width  of	rectangle   describing
					     border or bevel, in pixels.

       int	     height	   (in)	     Height  of	 rectangle  describing
					     border or bevel, in pixels.

       int	     borderWidth   (in)	     Width of border in pixels.	 Posi‐
					     tive  means border is inside rec‐
					     tangle  given  by	x,  y,	width,
					     height,  negative means border is
					     outside rectangle.

       int	     relief	   (in)	     Indicates 3-D position  of	 inte‐
					     rior  of object relative to exte‐
					     rior; should be TK_RELIEF_RAISED,
					     TK_RELIEF_SUNKEN,
					     TK_RELIEF_GROOVE,
					     TK_RELIEF_SOLID,		    or
					     TK_RELIEF_RIDGE  (may   also   be
					     TK_RELIEF_FLAT for Tk_Fill3DRect‐
					     angle).

       XPoint	     *pointPtr	   (in)	     Pointer  to   array   of	points
					     describing the set of vertices in
					     a polygon.	 The polygon need  not
					     be	 closed	 (it  will  be	closed
					     automatically if it isn't).

       int	     numPoints	   (in)	     Number of points at *pointPtr.

       int	     polyBorderWidth(in)     Width of border  in  pixels.   If
					     positive, border is drawn to left
					     of trajectory given by  pointPtr;
					     if	 negative,  border is drawn to
					     right of trajectory.  If  leftRe‐
					     lief   is	 TK_RELIEF_GROOVE   or
					     TK_RELIEF_RIDGE then  the	border
					     is centered on the trajectory.

       int	     leftRelief	   (in)	     Height  of left side of polygon's
					     path    relative	 to	right.
					     TK_RELIEF_RAISED  means left side
					     should    appear	 higher	   and
					     TK_RELIEF_SUNKEN means right side
					     should	  appear       higher;
					     TK_RELIEF_GROOVE		   and
					     TK_RELIEF_RIDGE mean the  obvious
					     things.	For  Tk_Fill3DPolygon,
					     TK_RELIEF_FLAT may also be speci‐
					     fied to indicate no difference in
					     height.

       int	     leftBevel	   (in)	     Non-zero means this  bevel	 forms
					     the  left	side  of  the  object;
					     zero means	 it  forms  the	 right
					     side.

       int	     leftIn	   (in)	     Non-zero means that the left edge
					     of the  horizontal	 bevel	angles
					     in,  so  that  the	 bottom of the
					     edge is farther to the right than
					     the  top.	 Zero  means  the edge
					     angles out, so that the bottom is
					     farther to the left than the top.

       int	     rightIn	   (in)	     Non-zero  means  that  the	 right
					     edge  of  the  horizontal	 bevel
					     angles  in, so that the bottom of
					     the edge is farther to  the  left
					     than  the	top.   Zero  means the
					     edge angles out, so that the bot‐
					     tom  is farther to the right than
					     the top.

       int	     topBevel	   (in)	     Non-zero means this  bevel	 forms
					     the top side of the object;  zero
					     means it forms the bottom side.

       int	     which	   (in)	     Specifies which of	 the  border's
					     graphics	contexts  is  desired.
					     Must      be	TK_3D_FLAT_GC,
					     TK_3D_LIGHT_GC, or TK_3D_DARK_GC.
_________________________________________________________________

DESCRIPTION
       These procedures provide facilities for drawing window borders in a way
       that produces a three-dimensional appearance.  Tk_Get3DBorder allocates
       colors  and  Pixmaps needed to draw a border in the window given by the
       tkwin argument.	The colorName argument indicates what colors should be
       used  in	 the border.  ColorName may be any value acceptable to Tk_Get‐
       Color.  The color indicated by colorName will not actually be  used  in
       the  border;   it indicates the background color for the window (i.e. a
       color for flat surfaces).  The illuminated portions of the border  will
       appear  brighter than indicated by colorName, and the shadowed portions
       of the border will appear darker than colorName.

       Tk_Get3DBorder returns a token that may	be  used  in  later  calls  to
       Tk_Draw3DRectangle.   If	 an error occurs in allocating information for
       the border (e.g. colorName isn't a legal color specifier), then NULL is
       returned and an error message is left in interp->result.

       Once  a	border	structure  has been created, Tk_Draw3DRectangle may be
       invoked to draw the border.  The tkwin argument	specifies  the	window
       for  which the border was allocated, and drawable specifies a window or
       pixmap in which the border is to be drawn.  Drawable need not refer  to
       the  same  window as tkwin, but it must refer to a compatible pixmap or
       window:	one associated with the same screen and with the same depth as
       tkwin.	The  x, y, width, and height arguments define the bounding box
       of the border region within drawable (usually x	and  y	are  zero  and
       width  and  height  are	the dimensions of the window), and borderWidth
       specifies the number of pixels actually occupied by  the	 border.   The
       relief argument indicates which of several three-dimensional effects is
       desired: TK_RELIEF_RAISED means that  the  interior  of	the  rectangle
       should  appear  raised  relative	 to the exterior of the rectangle, and
       TK_RELIEF_SUNKEN means  that  the  interior  should  appear  depressed.
       TK_RELIEF_GROOVE	 and  TK_RELIEF_RIDGE mean that there should appear to
       be a groove or ridge around the exterior of the rectangle.

       Tk_Fill3DRectangle is somewhat like Tk_Draw3DRectangle except  that  it
       first  fills the rectangular area with the background color (one corre‐
       sponding to the colorName  used	to  create  border).   Then  it	 calls
       Tk_Draw3DRectangle  to  draw a border just inside the outer edge of the
       rectangular area.  The argument relief  indicates  the  desired	effect
       (TK_RELIEF_FLAT means no border should be drawn; all that happens is to
       fill the rectangle with the background color).

       The procedure Tk_Draw3DPolygon may be used to draw more complex	shapes
       with  a three-dimensional appearance.  The pointPtr and numPoints argu‐
       ments define a trajectory, polyBorderWidth indicates how wide the  bor‐
       der  should  be	(and  on which side of the trajectory to draw it), and
       leftRelief indicates which side of the trajectory should appear raised.
       Tk_Draw3DPolygon	 draws	a border around the given trajectory using the
       colors from border to produce a three-dimensional appearance.   If  the
       trajectory is non-self-intersecting, the appearance will be a raised or
       sunken  polygon	shape.	 The  trajectory  may  be   self-intersecting,
       although it's not clear how useful this is.

       Tk_Fill3DPolygon	 is  to Tk_Draw3DPolygon what Tk_Fill3DRectangle is to
       Tk_Draw3DRectangle:  it fills the polygonal area	 with  the  background
       color  from border, then calls Tk_Draw3DPolygon to draw a border around
       the area (unless leftRelief is TK_RELIEF_FLAT;  in this case no	border
       is drawn).

       The  procedures	Tk_3DVerticalBevel  and	 Tk_3DHorizontalBevel  provide
       lower-level drawing primitives that are	used  by  procedures  such  as
       Tk_Draw3DRectangle.   These  procedures	are  also  useful in their own
       right for drawing rectilinear border shapes.  Tk_3DVerticalBevel	 draws
       a vertical beveled edge, such as the left or right side of a rectangle,
       and Tk_3DHorizontalBevel draws a horizontal beveled edge, such  as  the
       top  or	bottom	of a rectangle.	 Each procedure takes x, y, width, and
       height arguments that describe the rectangular area of the beveled edge
       (e.g., width is the border width for Tk_3DVerticalBevel).  The leftBor‐
       der and topBorder arguments indicate the position of the	 border	 rela‐
       tive  to	 the ``inside'' of the object, and relief indicates the relief
       of the inside of the object relative to	the  outside.	Tk_3DVertical‐
       Bevel  just  draws  a rectangular region.  Tk_3DHorizontalBevel draws a
       trapezoidal region to generate mitered corners;	it  should  be	called
       after  Tk_3DVerticalBevel  (otherwise Tk_3DVerticalBevel will overwrite
       the mitering in the corner).   The  leftIn  and	rightIn	 arguments  to
       Tk_3DHorizontalBevel  describe the mitering at the corners;  a value of
       1 means that the bottom edge of the trapezoid will be shorter than  the
       top,  0	means  it  will be longer.  For example, to draw a rectangular
       border the top bevel should  be	drawn  with  1	for  both  leftIn  and
       rightIn,	 and  the  bottom  bevel should be drawn with 0 for both argu‐
       ments.

       The procedure Tk_SetBackgroundFromBorder	 will  modify  the  background
       pixel  and/or  pixmap of tkwin to produce a result compatible with bor‐
       der.  For color displays, the resulting background  will	 just  be  the
       color  given  by	 the  colorName argument passed to Tk_Get3DBorder when
       border was created;  for monochrome displays, the resulting  background
       will be a light stipple pattern, in order to distinguish the background
       from the illuminated portion of the border.

       Given a token for a border, the procedure Tk_NameOf3DBorder will return
       the  colorName  string  that was passed to Tk_Get3DBorder to create the
       border.

       The procedure Tk_3DBorderColor returns the XColor structure  that  will
       be  used	 for flat surfaces drawn for its border argument by procedures
       like Tk_Fill3DRectangle.	 The return value corresponds to the colorName
       passed  to Tk_Get3DBorder.  The XColor, and its associated pixel value,
       will remain allocated as long as border exists.

       The procedure Tk_3DBorderGC returns one of the X graphics contexts that
       are  used  to draw the border.  The argument which selects which one of
       the three possible GC's: TK_3D_FLAT_GC returns  the  context  used  for
       flat  surfaces,	TK_3D_LIGHT_GC	returns the context for light shadows,
       and TK_3D_DARK_GC returns the context for dark shadows.

       When a border is no longer needed, Tk_Free3DBorder should be called  to
       release	the  resources	associated  with  the border.  There should be
       exactly one call to Tk_Free3DBorder for each call to Tk_Get3DBorder.

KEYWORDS
       3D,  background,	 border,  color,  depressed,  illumination,   polygon,
       raised, shadow, three-dimensional effect

Tk				      4.0		     Tk_Get3DBorder(3)
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