Dashed and Stippled outlines in Tk8.0.4

The current Tk8.0.4 release is missing some features, that hopefully appear
in future releases. The most important of them are dashed and stippled
outlines and postscript output for images and windows. This patch adds
the following enhancements:

   * The canvas now supports the new Tcl_Obj API. Makes things much faster.
   * Elide-patch, written by Tom Phelps <phelps@CS.Berkeley.EDU>. This
     makes the dash-patch compatible with TkMan 2.0.
   * Support for John Ellson's <ellson@lucent.com> Tkspline extension
     (ftp://ftp.tcltk.com/pub/ellson/Tkspline0.1.tar.gz). This allows
     the line and polygon canvas items to use additional smooth methods.
   * The options "-dash", "-activedash", "-disableddash", and "-dashoffset"
     are added to Arcs, Lines, Rectangles, Ovals and Polygons to allow for
     dashed outlines. The dash pattern can either be a list of integers or
     a string. When the line width is 1, the following equivalency exists:
	-dash .	        = -dash {2 4}
	-dash -         = -dash {6 2}
	-dash -.        = -dash {6 2 4 2}
	-dash -..       = -dash {6 2 4 2 4 2}
     If the line width is greater than 1, all values in the dash list
     are multiplied by the line width. So a "." will always look as
     a dot and "-" always as a dash. Both old and new syntax are
     continued to be supported, but only the above 4 examples are
     displayed correctly on Windows.
   * Options "-tile", "-activetile", "-disabledtile", "-outlinetile",
     "-activeoutlinetile" and "-disabledoutlinetile". Now you can
     use an image for tiling. These options override the corresponding
     "-fill" and "-stipple" options. It works for all canvas objects and for
     many widgets (e.g. text, canvas, buttons, frames .....). This
     feature originally comes from Blt, which is written by George Howlett.
   * Postscript output for images and windows in canvas (Written by Henry A
     Rowley, originally distributed as tkImgPs.tar.gz)
   * New option "-warp" for the "event generate" function. When this
     option is set to "yes" (or "1" or "true"), not only an event is
     generated, but also the mouse pointer is warped to the same location.
     For example: "event generate . <Motion> -warp yes -x 10 -y 10"
     It can be used for Motion, Button, ButtonRelease and Key events only.
   * The visitors patch (by Matthew Rice <Matthew.Rice@ftlsol.com>) is also
     included. This makes it  possible to add new canvas commands without
     making more changes in the Tcl/Tk core. An example is his rotate
     visitor (ftp://pgw.on.ca/pub/tcl/visrotate1.2.tar.gz).
   * The entry validation patch, written by Jeffry Hobbs.
   * The option "state" is added to all canvas objects and the canvas it
     self. Many options are added to all canvas objects that are related to
     this state.
   * The options "-dash", "-activedash", "-disableddash", and "-dashoffset"
     are added to Arcs, Lines, Rectangles, Ovals and Polygons to allow for
     dashed outlines.
   * Indexing for coordinates of polygons and lines.
   * All canvas objects now accept the coordinates in a single argument.
     This works for both the "create" and the "coords" commands.
   * The option "-joinstyle" is added to Polygons, and a small related bug
     is corrected. Works the same as for lines, except that the default is
     "round" and not "miter". In my opinion the default should be "miter",
     but unfortunately John Ousterhout only implemented rounded outlines for
     polygons now. It's easy to change in the future, anyway.
   * The options "-outlinestipple", "-activeoutlinestipple", and
     "-disabledoutlinestipple" are added to Rectangles, Ovals and Polygons.
     Arcs already has "-outlinestipple" in the core, but not its family members.
   * The option "-updatecommand" specifies a command that should be executed
     each time the canvas object is updated on the screen.
   * The scan dragto widget scroll command now has an additional parameter
     gain. You can override the default gain of 10 times by that. This works
     for list boxes and text widgets too.
   * Any widget that has the -state or -wrap options now accepts truncated
     values. So you can use "-state n" as abbreviation of "-state normal" or
     "-wrap w" as abbreviation of "-wrap word"
   * The manual page (canvas.n) is adapted for all of the above. (Thanks to
     John Ellson)
   * Postscript output is adapted for all of the above changes, except for
     the "-tile" option (and "-activetile" ...... of course).

==========================================================================

More information about the dash-patch:

	http://home.wxs.nl/~nijtmans/dash.html

Maintained by:

	Jan Nijtmans, CMG (Computer Management Group) Arnhem B.V.
	email: Jan.Nijtmans@wxs.nl (private)
	       Jan.Nijtmans@cmg.nl (work)
	url:   http://home.wxs.nl/~nijtmans/