File: CHANGES-0.7

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September 14th 1999 ivtools-0.7.10

Drawing Editors

	* propogate the horizontal-drawing-of-text-while-in-landscape-mode
 	enhancement that's been in drawtool for awhile to idraw, because
 	this is a long-standing Debian request, and it's hard to see how
 	it would bother anyone.  Before you would be entering vertical
 	text when in landscape mode.  Now it will be horizontal, just like
 	it is in portrait mode.

Interpreter Changes

	* change comterp's for and while command to accept an extra fixed
 	argument for the body expression if no :body argument exists,
 	i.e.:

	for(x=0 x<10 x++ print("%d\n" x))

	x=0;while(x<10 print("%d\n" x))

	instead of:

	for(x=0 x<10 x++ :body print("%d\n" x))

	x=0;while(x<10 :body print("%d\n" x))

	* fix bugs in incr_after (postfix ++) and decr_after (postfix --)
 	commands in comterp.

Library Changes

	-- Attribute --

	* add methods for checking a "blank" AttributeValue.  These
	are pushed on the stack by comterp whenever an interpreter
	command fails to put anything on the stack.

		AttributeValue::is_blank
	
		static AttributeValue::is_blank(ValueType t)

	-- OverlayUnidraw --

	* set up a new method, OverlayEditor::ReplaceComponent, to do what
 	::SetComponent does, plus delete the old component if it is no
 	longer used in the Unidraw environment.  This gets rid of a bug
 	that appeared in ivtools-0.7.9, where the deleting of the old
 	component was done in two places, once in OvNewCompCmd::Execute
 	(where it has always been done) and once in
 	OverlayEditor::SetComponent (where it was done for the duration of
 	ivtools-0.7.9).

	* fix bug (that appeared in ivtools-0.7.9) for handling of the New
 	command Postscript-format option on the export dialog box.
	

Miscellaneous and Configuration Changes	

	* a set of changes to config files and some source files to get
 	ivtools compiled on Windows NT using Cygwin beta 20.  Everything
 	works to build the executables, including the configure script and
 	the imake process.  Haven't yet tested it with an X server. See
 	README.cygwin for more details.  Thanks to John Carlson at
 	Lawrence Livermore National Labs for showing this was possible
 	with his copy of InterViews, Cygnus Solutions' Cygwin environment,
 	and X11R6.4 Xlib binaries from NASA.
	
	* change the script in aclocal.m4 for finding the
 	CPlusPlusIncludeDir to work on Windows NT (with Cygwin) as well.

	* rename these directories:

	comterp, iueserv, drawserv

	to:

	comterp_, iueserv_, drawserv_

	This is to avoid a collision with the library directions ComTerp,
 	IueServ, and DrawServ which would happen when untar'ing ivtools on
 	a Windows NT box (using the Cygwin tar).  Although upper and lower
 	case are preserved, they are not distinct for purposes of file
 	comparison on that platform.


July 30th 1999 ivtools-0.7.9

Drawing Editors

	* add a "PostScript" format to the export dialog box, which means
 	when checked to use the existing incompatible extension to idraw
 	PostScript format which supports color image rendering.  With normal
 	idraw format, which is a restricted formulation of real
 	PostScript, the color images print grey.

	* terminate a multi-point drawing tool if right-clicks cause the
 	number of vertices to become zero.  

	* added keyboard shortcuts for zoom-in (Shift-Z) and zoom-out
 	(Ctrl-Z).

	* change behavior of magnify-tool to zoom by 2 around a
 	single-click. Done in all drawing editors, including idraw.
	
Interpreter Changes

	* modify the comterp "+" operator to concatenate two strings.

	* create a comterp eval command to take a set of strings and
 	return an array of evaluated results on the stack.  Same
 	functionality as the "," operator, only from strings.

	* add a :str and :err keywords to comterp's print func.  :string
 	already existed, :str is just shorter for something so commonly
 	used (since the advent of string concatenation).  :err writes to
 	stderr instead of stdout.  

        * fixed bug in comterp help func that caused a segfault when help
 	was requested for unknown operator strings, i.e. help("^")

Library Changes

	-- IV-common and Unidraw-common --

	* add a link to Unidraw/geomobjs.c from Unidraw-common, and a link
 	to OS/math.c to IV-common.  This is done so that both geomobjs.c
 	and fgeomobjs.c can be used from comterp.  This is tested with the
 	construction of a PointObj and FPointObj in comterp/main.c. So if
 	you can get everything built through comterp you can make use of
 	these geometric objects without any other IV or Unidraw code.

	-- Attribute --

	* added API to ComModule (<Attribute/commodule.h>) to inspect the
 	operator table for infix,postfix, or prefix operators that match a
 	string.

	-- Unidraw --

	* deprivatize boolean Unidraw::updated(), so it can be used to
 	prune unnecessary calls to Unidraw::Update from comdraw.

	-- AttrGlyph -- 
	
	* modified AttributeListEditor::update_text to put a blank
 	after long attribute names.
	
	-- OverlayUnidraw --

	* three partial experiments to improve the incremental loading of
 	rasters from URLs.  Each temporarily disabled for various reasons
 	with a unique #define:

	#define OPEN_DRAWTOOL_URL // define for drawtool document loading
	           	          // from a URL in ovimport.c

	#define RASTER_DAMAGE1 // define for incremental flushing of raster
	                       // in ovraster.c

	#define RASTER_DAMAGE2 // define to use mb of incrementally loaded
	                       // region for raster damage in ovraster.c

	The OPEN_DRAWTOOL_URL attempt first causes a placeholder graphic
 	to be opened and displayed, and nothing more happens until you
 	manipulate the placeholder graphic in some way, like moving it.
  	Then the contents of the drawtool document is displayed, which may
 	include raster referenced by URL, which are incrementally
 	displayed as they are loaded.

	The RASTER_DAMAGE1 attempt works when importing images or opening
 	them by themselves or another document, but you can see artifacts
 	(all white rows) if you zoom in and out repeatedly during the load
 	process.

	The RASTER_DAMAGE2 attempt works when importing images but not
 	completely when opening images by URL whether stand-alone or in a
 	drawtool document.

	-- ComUnidraw --

	* start work on an ivtools distributed whiteboard capability.
  	Decided to implement this using the comdraw command interpreter.
  	Now all the Command objects generated by a Manipulator are
 	indirectly executed via a new ComEditor::ExecuteCmd method (the
 	base class method, OverlayEditor::ExecuteCmd, just calls
 	Command::Execute immediately). This indirect execution is where
 	things will get beefed up to make for a distributed whiteboard.

	Right now, whether you specify -wbmaster or -wbslave on the
 	comdraw command line, all the PasteCmd's (the commands that result
 	when a GraphicCompTool is used) are converted into comdraw script
 	capable of constructing and pasting the equivalent comp.  In the
 	future this script would be transmitted to the whiteboard master,
 	then redistributed to each whiteboard slave.  Right now it is
 	simply interpreted within the local comdraw, to show that things
 	work (somewhat).

	The script is generated by constructing a SCRIPT_VIEW of the
 	components in the clipboard of the PasteCmd, then having it write
 	it's ::Definition out to an ostrstream.  This worked fine for
 	ellipse with no changes to the generated script. Synonym commands
 	had to be set up for rectangle (rect), arrowline (line),
 	arrowmultiline (multiline), and arrowspline (closedspine).  Right
 	now it works for everything but the text graphic, and any of the
 	multi-point graphics.

	Currently it ignores all the additional arguments that get spewed
 	out in the script (like :fgcolor) and takes these instead from the
 	default graphic state of the viewer.  When used in a true
 	distributed fashion these would need to be used, and this would
 	then allow each person to have their own default graphic state.

Miscellaneous and Config Changes

	* fix the inclusion of nan.h when using glibc-2.0.  It already
 	worked for glibc-2.1.  It migrates the conditional include of
 	nan.h from OverlayUnidraw/grayraster.c to src/include/ivstd/nan.h.
  	It tests for !glibc-2.0 before using bits/nan.h as the include
 	file pathname.  Worked out with help from Guenter Geiger.

	* patches to compile on SunOS 4.1.4 from Nico Kadel-Garcia at the
 	Massachusetts Eye and Ear Infirmary.

	* remove fgeomobjs.c from Unidraw-common.  It didn't really belong
 	there.

	* modify the configure script to detect if necessary symbolic
 	links are missing and add them.  This happens when you get a copy
 	of ivtools from a cvs repository.
	
	* threw out the Dispatch/ace*.h files.  If there are used anywhere
 	those references will have to be changed to AceDispatch/ace*.h.

	* added links from the PERCEPS-generated documentation to the old
 	3.1 man pages for the Dispach library.  Full-up links for
 	InterViews and Unidraw remain to be done.

	* fixes for building with ACE 4.6.15 and glibc-2.1, submitted by
 	Guenter Geiger.
	
	* beefed up MANIFEST.comterp (and README.comterp) so that now a
 	stand-alone comterp tar file can be created, untarred in a new
 	place, configured, built, and installed.  All works smoothly now.
  	The resultant tar file is 1/5th the size of the entire ivtools.

	* removed a Use_libInterViews() from src/Attribute/Imakefile,
 	because this library doesn't really have an InterViews dependency
 	(only IV-common and Unidraw-common).  From Guenter Geiger.

	* new InstallXDefaultAs rule in config/rules.def from Guenter
 	Geiger, to get the permission right when installing
 	InterViews.defaults.

June 10th 1999 ivtools-0.7.8

Interpreter Changes

	* migration of the stream operator "," upwards in the parsing
 	priority table, to have higher priority than the assignment
 	operators, so that something like:

	v=1,2,3,4

	ends up assigning a list to the variable v that can be passed to
 	commands like size, at, sum, etc..

	* came up with a solution for iterating over multiple space
 	delimited expressions in a single line of input when using a
 	comterp in server mode.  Now something like:

	1 2 3 4


	returns:

	1
	2
	3
	4

	* add an echo of returned results to the comterp client mode.

Library Changes

	-- Attribute --	

	* add extra predicates to AttributeValue:

	AttributeValue::is_numeric() (same as ::is_num)
	AttributeValue::is_object()

	* change timer mechanism in ComTerpHandler to disable old
	timer before creating new one.

	-- ComTerp --	

	* catch one more place (ComTerpServ::runfile()), where the
	bufsiz needed to be kicked up to 1M.

	-- FrameUnidraw --

	* fix bug in deserializing code for a FrameIdrawComp so that
	if a background frame already exists another one is not created.

Config and Miscellaneous Changes

	* add IET Inc. to the overall copyright, to reflect their
	new status as a contributor to and supporter of ivtools.

	* added workarounds for glibc-2.* needed by Dispatch/dispatcher.c
 	and OverlayUnidraw/grayraster.c.  Makes ivtools compile on RedHat
 	6.0.

May 3rd 1999 ivtools-0.7.7

Drawing Editor and Drawing Editor Framework Changes

	* add Ellipse::ellipse_to_polygon method, to return
	a list of points that define an ellipse as a polygon.

Interpreter and Interpreter Framework Changes

	* add command to return the size of a list (ListSizeFunc/size).
	
	* add command to return the nth member of a list (ListAtFunc/at).

	* add a :nowait argument to the remote command, to allow for
	asynchronous transmission of commands to a remote interpreter.

	* add a ComFunc::exec method for use of derived class ::execute
	methods.  It calls ComFunc::push_funcstate, then ::execute, then
	ComFunc::pop_funcstate.

	* fix a bug where the print command was passing a double
	to a float format string.

	* add an AttributeList::merge method, for combining the contents of
 	two AttributeList's.

	* add a ComFunc::stack_keys method, for returning all the
 	keyword/value pairs of a ComFunc invocation in an AttributeList.

	* create a SetAttrFunc in ComUnidraw that can be used to set the
 	attributes of a graphic component via the command
 	interpreter. 

Config and Miscellaneous Changes

	* fix problem with relative install of shared libraries that
	was recently introduced.

	* TopoFace/fgeomobjs.c temporarily incorporated into Unidraw-common
	so it can be made use of from comterp and other IV-free
	applications.  The better long-term approach is to link the
	TopoFace library into comterp, and incorporate any IV or
	Unidraw classes that it relies on into IV-common or
	Unidraw-common.

	* Experiment with a MANIFEST.comterp that specifies a
	stand-alone subset of ivtools that excludes the bulk of IV and
	Unidraw.  The resultant source tree builds with a
	"./configure;make World", but there are lots of warnings and
	errors to be smoothed over.

	* increment all the buffer sizes associated with comterp from the
 	default 1K (BUFSIZ) to 1M.  A better solution would be to revisit
 	the continuity of command input over multiple input buffers for
 	the various modes of input (or at least make it a command line
 	parameter or X resource).  When entering command via stdin it is
 	easy enough to use command line continuation (automatically
 	invoked if an expression is incomplete) or character string
 	continuation (a backslash followed immediately by a newline).  But
 	this generality does not apply to socketed interactions, etc..

	The buffer overrun (at 1K) was being correctly detected, and
	disaster averted, but it was still a problem because there was
	no course of correction.  So upping it to 1M is a quick fix.  

	* fix a file id limitation of 20 on Solaris.


April 16th 1999 ivtools-0.7.6

Drawing Editor and Library Changes

	* when reading rasters from URL's, set the "by-pathname" flag
 	based on import dialog box check box.  This flag controls whether
 	a raster is serialized with just a pathname or with all the pixel
 	data.

	* update flipbook's view menu to include things like the scribble
 	pointer, etc..  Still no support for multiple viewers.

	* fix some very old event handling bugs in drawtool etc..  Have
 	you ever seen the cursor jump the first time you draw or move
 	something in an editor?  There were two different problems, one
 	where X coordinates were not getting converted to IV coordinates
 	(upper-left origin to lower-left origin), and the other was a
 	little more tricky.  Whenever something is dragged in an editor,
 	the software issues an XGrabPointer to the server, so that all
 	subsequent events come through relative to the canvas of the
 	drawing editor.  Except, because of the client-server nature of X,
 	it was possible for some motion events to slip through before the
 	XGrabPointer had taken affect!

	* add a pointer-tracking mechanism to drawtool (invoke with
 	-ptrloc command line argument).  This introduces an extra bar
 	across the top (below the menu-bar) with a constantly updated
 	readout of the pointer in document coordinates.

	Several things had to be developed to make this work:

	- a static function pointer (a callback) was added to the 
	Event class, to be invoked (if defined) for every event
	read from the X server.  This is its signature:

    typedef void (*event_tracker_ptr)(Event&);

	and these are the methods for setting and retrieving
	the static function pointer:

    static event_tracker_ptr event_tracker() { return _event_tracker; }
    static void event_tracker(event_tracker_ptr ptr) { _event_tracker = ptr; }

	- a static method on OverlayUnidraw was developed that matched
	this signature:

    static pointer_tracker_func(Event&);

	this method ignores all but motion events, but still had to
	deal with 3 different kinds of motion events:

	1. motion events associated with the top-level window
	(the ApplicationWindow) before the offset to Unidraw canvas
	is known (this requires traversing the X Window tree to
	compute the offset using a new method Window::offset_from_toplevel).

	2. motion events associated with the top-level window after
	the offset to Unidraw canvas is known (which happens after the
	first mouse click within the Unidraw canvas).

	3. motion events directly associated with the Unidraw canvas
	(these occur during a drag operation within the canvas).

	In each case the right thing was done to convert the raw
	XEvent locations to canvas screen coordinates, which are
	then converted to drawing coordinates using
	OverlayViewer::ScreenToDrawing.  This method also deals
	with multiple-editor/viewers, by searching the Unidraw editor
	list to find which editor/viewer the event corresponds to.

	- finally, a state variable was developed (PtrLocState) that
	converts the screen coordinates to drawing coordinates and
	displays them in a glyph.

Config and Miscellaneous Changes

	* really make things work without a CPU environment variable.  It
 	was necessary to change a $$CPU to a $(CPU) in the makefile stuff.

	* modify configure script to allow for the specification of only
 	one pathname for each underlying library.  You can still specify
 	the second pathname to explicitly say where the libraries are, but
 	if it can find them without this everything works.  For example,
 	you only have to supply --with-ace, and not --with-ace-libs, if
 	the libraries and include files for ACE are co-located.

	* fix unnecessary bash dependency in configure script.  

	    export PWD=`pwd` 

	is now 

	    PWD=`pwd';export PWD.

	* various fixes to Solaris 2.6 build and install submitted by Roy
 	M. Lecates of Fore Systems:

	- workaround for collision with #define of ManDir
	in config/config-solaris-gcc.mk

	- new command line for installing symbolic links: 
	"tar cf - file | (cd dir; tar xfp -)" instead of "cp -d"

	- patch to make src/sripts/bsdinst.sh handle multiple files

	* patch to add "[]" after delete where ever purify wants it,
 	submitted by Roy M. Lecates of Fore Systems.

	* explicit definition of FloatCoord (same as the default Coord) in
 	src/include/InterViews/coord.h


March 19th 1999 ivtools-0.7.5

Drawing Editor Changes

	* re-center rasters imported from a URL as soon as the width and
 	height are known.

	* fully animate move/scale/stretch/rotate tools.  Can be disabled
 	with -opaque_off or -opoff given to drawtool or any derivative
 	editor.

Interpreter Changes

	* add an import command to comdraw, which for now takes a raster
 	URL and imports it into the drawing editor.  To try it out, run
 	ivtools flipbook, enable auto-new-frame (under the View menu),
 	then enter something like the following into stdin:

	  for(x=1 x<5 x++ :body 
	    import(print("http://www.vectaport.com/ivtools/aaron-%d.gif" x :string)))

Library Changes

	-- OS --

	* make the offset for String::contains apply to the internal
 	string.  Didn't make much sense applied to the first argument.

	-- IV-2_6 -- 

	* add a ClassId system to all the classes derived from Rubberband,
 	for use of the OpaqueDragManip described below.

	-- ComTerp -- 

	* add short and ushort output to ComValue ostream operator.

	-- OverlayUnidraw --

	* fixed a bug in OvImportCmd where imports via ACE were getting
 	treated like URL imports for asynchronous incremental download
	(because the is_url flag was set).

	* migrate OvImportCmd::is_url to be a method that computes its
 	value from a pathname, instead of needing to be set and cleared.

	* in OvImportCmd, separate out the code fragment for centering a
 	newly imported component, snapping to grid if gravity on:

	  static void OvImportCmd::center_import(Editor*, GraphicComp*)

	then use it to re-center a raster being imported from a URL as
 	soon as the width and height are known.

	* create OpaqueDragManip (OverlayUnidraw/ovmanips.c) to replace
 	the rubberbands with directly visualization of graphical
 	transformations (move/scale/stretch/rotate).
	
	Care was taken in the creation of OpaqueDragManip, making sure
 	that there was no cumulative error accrued with many small mouse
 	moves, so hopefully you'll never see the graphic jump when you let
 	go of the mouse button.
	
	-- FrameUnidraw --

	* fixed a bug in FrameViewer::Update, where ::Update was getting
 	erroneously called when a resize was needed (same problem was
 	fixed a short while back in OverlayViewer::Update).

Config and Miscellaneous Changes

	* upgrade the configure script to auto-determine the CPU type, the
 	PWD, the XCONFIGDIR, and the GPLUSPLUSINCLUDEDIR.  This greatly
 	simplifies the INSTALL directions.  Now the following command is
 	all it should take to build from source on most commercial Unix'es
 	(as long as imake invokes a gcc version of cpp):

	  ./configure;make World;su -c "make install"

	To do this I had to generate two output files from configure, one
 	to feed the imake process as before (a config/config-<os>-gcc.defs
 	generated from config/config.defs.in), and another
 	(config/config.mk) to be directly pulled in by the top-level
 	Makefile (and every other Makefile).

	* restructure the declaration of make variables for library
 	pathnames in config/local.def (adds a new file,
 	config/makevars.def), so that each library has to be listed only
 	twice, once for the LIB* variable, and once for the DEP* variable.
	
	* add support for file: to ParamList::urltest and
 	OpenFileChooser::urltest (this is conditional on finding w3c or
 	curl).

	* gcc-2.8.1 warnings fixed.

	* remove a duplicate -I on the src directory when compiling.


February 27th 1999 ivtools-0.7.4

Drawing Editor Changes

	* make use of the X Shared Memory extensions for raster display.

	* implement asynchronous download and incremental display of color
 	images from a URL.  To test, make a local copy of
 	http://www.vectaport.com/ivtools/anteaters.drs, and open it with
 	ivtools drawtool.  Watch while the rasters within this drawing are
 	downloaded from various web servers.  Before its finished you can
 	pan or zoom the drawing, and move or draw any graphic (including
 	the partially downloaded rasters).  Then you can Undo all your
 	changes to get back to a fully-loaded, unmodified drawing!

	* add support for Ctrl-K (delete-until-end-of-line) to the string
 	editor used throughout ivtools.  

	* add support for pasting the current X Window selection when the
 	middle mouse button is clicked within a string editor. Especially
 	useful for the string editor used within the Open and Import
 	dialog boxes.

	* add a one-line welcome message to every drawing editor that
 	gives the ivtools version number, identifies the editor, and
 	states how to find more information.

	* complete support for floating point brush width (line width) in
 	all ivtools drawing editors.  New idraw PostScript format version
 	number (12) introduced to facilitate this.  

	Version 11 has been in use since ivtools-0.6.7, and differed from
 	the class Version 10 in only one detail, the addition of
 	"closepath" to the PostScript fragments for circle and ellipse
 	graphics.  Version 12 is forward-compatible, in that future
 	versions of idraw will be able to always read it, but for the
 	first time in a long while there is no guarantee of backward
 	compatibility.  This has been the design and intent of the idraw
 	version numbering system all along.

	Ideally what this means is that users of older versions of idraw
 	would see a warning message that explained why a newer format
 	drawing didn't load.  Unfortunately pre-existing bugs in idraw
 	(ones that have been fixed since ivtools-0.6.7) cause the warning
 	message to have zero's where version numbers should go and/or
 	cause idraw to segfault when it can't load a newer format.  The
 	warning message should work ok for users of idraw from Debian 2.1.
  	For more details see:
	
 	    http://www.vectaport.com/ivtools/faq.html#idrawversions.

	* The incrementing of the idraw format version number was
 	undertaken to add support for floating point line widths, at the
 	request of Robert S. Maier, the developer of GNU plotutils.  This
 	possiblity has not been enabled yet.  But to show off the new
 	capability a "Precise Width" was added to the Brush menu of
 	drawtool, etc..  For kicks try something like 10000.
	
	* add a check for using the curl download utility, after checking
 	for the w3c download utility, and before trying the native ivdl
 	utility.

Interpreter Changes	

	* add a one-line welcome message to every interpreter that
 	gives the ivtools version number, identifies the interpreter, and
 	states how to find more information.
	
Documentation Changes

	* finalize the embedding of PERCEPS extractable comments in the
 	header files for most of the class libraries:

	    http://friga.mer.utexas.edu/mark/perl/perceps/

	* add a -t argument to iclass to generate a tree structured
	web page of links to HTML class documentation.

	* create a src/html directory with enough instructions and
	PERCEPS template files to allow a third party to recreate
	most of the HTML documentation for ivtools found under:

	    http://www.vectaport.com/ivtools/doc/

ComTerp Framework Changes

	-- ComTerp -- 

	* make NilFunc that ignores all its arguments, does (almost)
 	nothing except for returning nil on the stack.  Bind it to the nil
 	symbol in comterp.

	* fix problem with undefined commands inside the body of a control
 	command by substituting a NilFunc to execute (while preserving the
 	symbol id associated with the undefined command).

	* add a _command_symid member variable to ComFuncState, so that
 	this value can be used a NilFunc to report what undefined command
 	is being skipped by returning nil on the stack.

	* add numeric conversion funcs: char (CharFunc), short
 	(ShortFunc), int (IntFunc), long (LongFunc), float (FloatFunc),
 	double (DoubleFunc). In the future unsigned'ness can be added with
 	keyword arguments, and maybe a boolean func could be defined as
 	well.

Glyph Framework Changes

	-- IV-X11 -- 

	* add support for the SelectionNotify X11 event type.  This is
 	what a client receives after it makes a request for the current X
 	selection (i.e. what happens when the middle mouse button gets
 	pressed in something like an xterm).

	* add a new InputHandler virtual method:

	    InputHandler::selection_notify(const Event&); 

	this gets called whenever a SelectionNotify event arrives at an
 	InputHandler.

	-- InterViews -- 

	* make a FieldEditor::selection_notify(const Event&) method that in
 	turn delegates the SelectionNotify event to a new
 	FieldStringEditor::do_xselection_paste.

	* finally (actually this was first), change the
 	FieldStringEditor::press method to call a new
 	FieldStringEditor::do_xselection_request whenever the midddle
 	button is pressed.  When that happens the client asks the server
 	to get the current window manager selection from whomever owns it,
 	and assign it to a property on the local window.  When this is
 	done a SelectionNotify event gets generated and
 	FieldStringEditor::do_xselection_paste ends up getting called to
 	paste the result into the FieldEditor.  Voila!

        -- glyphs/examples3.1 -- 	

	* add most of the InterViews 3.1 glyph example programs in a
 	subdirectory alongside the rest of the glyph examples, except for
 	gl which requires gl.h and punidraw which requires Unidraw.
  	morpher and plot/sendplot need to be debugged.

	* to run the button2 example you have supply a tif file as the
 	first argument on the command line, or have a copy of jello.tif
 	(from the 3.1 distribution) in your current directory.

	* create README's for src/glyphs and src/glyphs/examples3.1

	* make the morpher example use its own classnames for things in
 	figure.(ch) This is the same process that created
 	IVGlyph/figure.(ch) a long time ago.  These could be made to use
 	the same classes, but not worth doing until the morpher example
 	looks more promising.  Maybe even the morpher example should be
 	thrown out (again).

Unidraw Framework Changes

	-- OverlayUnidraw --

	* change Overlay(s)Comp's interpretation of a duplicate command
 	(DUP_CMD), to duplicate the AttributeList as well if one exists.

	* change the ::Copy methods of all the comp's in OverlayUnidraw,
 	to replicate the associated AttributeList if there is one.

	-- GraphUnidraw --

	* debug the duplicate (DUP_CMD) command when used on NodeComp's in
 	graphdraw.  Turns out the istream constructed NodeComp's did not
 	have the same layout of graphic state as the others.  The
 	underlying TextGraphic did not have a Font pointer, for example.
  	This was no problem in rendering, but was a problem for the
 	duplicate command, which invoked a get-extent operation which
 	failed for lack of knowing the font.  Fix was to push down gs of
 	the Picture graphic associated with the NodeComp to be in the
 	underlying ellipse and text graphics as well.

	-- DrawServ --

	* rename all the classes in DrawServ to have a "Draw" prefix
 	instead of a "Com" prefix, to alleviate confusion between the
 	ComUnidraw and DrawServ layers.

	* derive everything in DrawServ from FrameUnidraw.  Already
 	DrawServ had been able to handle components from GraphUnidraw
 	without having its mechanisms inherited from GraphUnidraw.  This
 	"finishes" the job, making for a multi-frame graph editing
 	framework.

Miscellaneous and Config Changes

       	* remove all WishList files.  This is now handled outside of the
 	tarfile, some of it on:

	    http://www.vectaport.com/ivtools/help-wanted.html


	* changes required based on feedback from M. Rasit Eskicioglu at
 	the University of Alberta, as he tried (and succeeded) building
 	ivtools on Solaris 2.6, as well as a few changes based on feedback
 	from Bruno DelFosse at Thompson CSF (Dec Alpha guy).

	* many improvements to the non-relative installation process (the
 	default), including fixing the generated ivmkmf script.

	* creation of an uninstall makefile target, which reverses the
 	effect of "make install".  Useful for backing out the installation
 	of one version of ivtools before installing another, or before
	switching modes of installation.

	* src/include/std renamed to src/include/ivstd, so it makes a
 	little more sense when someone does a non-relative install in
 	/usr/local.

	* upgrade to gcc-2.8.1 and libstdc++-2.8.1.1, which required some
 	changes: 

	- new src/include/ivstd/signal.h file, to reset NULL to be 0
	(instead of ((void*)0).  Same trick required in
 	src/include/ivstd/string.h (to avoid new warnings).  

	- add the OS String class to the IV-common library, and extend it
 	so that utils/ivdl could be ported to use it, to avoid any use of
 	libg++ String (libg++ is no longer recommended, at least by the
 	gcc-2.8.1 distribution).  

	- changes to Attribute/paramlist.c and a few others to get rid of
 	new warnings.
	
	* upgrade to ACE-4.6, which required some changes:

	- the register_stdin_handler method on the Reactor is no longer

	- need to add -UHAVE_ACE to makedepend 

	- more changes required for ivmaps (like #undef CLOSED after
	<VpfUtil/vpftable.h> -- that'll be in a patch someday.

	* add a src/tests directory, with the first program useful for
 	demonstrating no Y2K problem in ivtools (y2k/y2ktest.cc).

	* incorporate COPYRIGHT.proposed as another way of getting
 	comments.

	* add comtop.tgz directly to the tar file, the tar file for a
 	sample stand alone custom comterp.

	* fix up the use ivmkmf in conjunction with comtop.tgz, making it
 	work equally well with and without --enable-relative-install
 	supplied to ./configure.

	* rewrite the definitions of the library makefile variables in
 	config/local.def, so that a conditionally determined macro gets
 	defined first, then each library requires only a single line after
 	that (and a single line for the dependency make variable).
  	Because of the inflexiblity of the C preprocessor this is not so
 	elegant, in that the arguments to the macro have to include the
 	library name without and without the prefix, and one with a -l
 	prefix.  But is still only a single line, which is a big improvement.

	* make use of the UseInstalled preprocessor define to indicate
 	when Makefiles should be generated to use the installed copy.
  	This really only makes sense (or is only currently used) for
 	ivmkmf when --enable-relative-install was not given to
 	./configure.

	* adds a historical list of changes to ivtools over the course of
 	version 0.4

	* appends to CHANGES-0.5 changes which occurred for 0.5.1 and
 	0.5.2. This leaves only 0.5.3 and 0.5.4 (and any work prior to
 	0.4.0) undocumented.

	* small change found in Debian ivtools-0.7.3-1 changes.
	
January 26th 1999 ivtools-0.7.3

Drawing Editor Changes

	* add support for CR and ESC to the attribute editing dialog box
 	of any drawing editor.  Now CR accepts the contents of the two
 	field editors (when the focus is in one of them) and ESC clears
 	the field editor with current focus.  Also the current contents of
 	the field editors is added to the attribute list whenever OK is
 	clicked.

	* glyphify (grayish 3d look) the "Precise Page" dialog box, which
 	invokes the command to reset the drawing editor page size.

	* fix the use of the "save by pathname" checkbox on the export
 	dialog box.

	* change both the export and print dialog boxes so that they don't
 	clobber a command line or pathname that has been entered when you
 	click on the "to command" checkbox or the output format
 	enums/checkboxes.  This is done by disabling the auto-update
 	feature (the thing that automatically places a
 	ghostview/idraw/drawtool command line when "to command" is
 	checked) whenever the contents of the field-editor has changed
 	from the default.

Utility Changes

	* add a -d argument to iclass to dump an html file of links to web
 	pages named the same, i.e. Interactor.html or OverlayComp.html.
  	Each class link is followed by a menu of derived classes.  See the
 	result when used on ivtools at
 	http://www.vectaport.com/ivtools/doc/classes/derivedclasses.html.

Library Changes

	-- Attribute --

	* add a ParamStruct copy constructor.

	* protect "int AttributeList::add_attr(Attribute*)", because it
 	requires the user to be aware of the return status and free memory
 	if required, and replace it with a public "void
 	AttributeList::add_attribute(Attribute*)".  NOTE: This is a
 	less-than 100% backward compatible change to the API of the
 	Attribute library.  You may have to switch your code over to the
 	new method, and in the process you might remove a memory leak.

	* add AttributeList::add_attr methods that take an "int symid".

	-- ComTerp -- 

	* changes ComTerp/assignfunc.c to use AttributeList::add_attribute
 	instead of the now protected ::add_attr(Attribute*);

	-- InterViews -- 

	* remove limitation of 1024 command line arguments for any
 	program.  Found while running iclass with more than 1024 header
 	files in the command line.

	-- Unidraw --

	* add a ::Width() and ::Height() method to PageGraphic.

	* change the copyright notices on all the Graphic-related files
 	that were changed back in 1994 to accomodate hide/show/sensitivity
 	and gs/pts/pic compaction.

	-- UniIdraw --

	* add support for floating point line widths to idraw, as
 	requested by Robert S. Maier, the GNU plotutils guy.  This is
 	indicated by Version 11 of the idraw format, but a floating point
 	line width can a) be successfully read if incorporated in an older
 	idraw format, and b) can be successfully ignored by older idraw
 	executables (because the istream method for reading an integer can
 	handle floats).  This was easy to do, because the object
 	underlying the idraw brush object PSBrush is Brush, and it had
 	always supported a floating point line width.  Further plans for
 	Version 11 of idraw format include support for the capstyle and
 	joinstyle of a brush.

	* fix an egcs revealed problem in the Arrowhead class
 	(UniIdraw/idarrowhead.*), where an Arrowhead&
 	Arrowhead::operator=(Arrowhead&) needed to be defined as well as
 	the existing Graphic& Arrowhead::operator=(Arrowhead&) (Debian bug
 	#30749).  This had not been a problem with earlier C++ compilers,
 	because they defaulted to using the assignment operator for
 	Graphic& whenever an assignment operator for Arrowhead& wasn't
 	available.

	-- OverlayUnidraw --

	* remove a mysterious call to OverlayViewer::Update from within
 	OverlayViewer::Update (invoked when _needs_resize is true).

	* change the classid macro in OverlayUnidraw/ovcomps.h so that it
 	adds methods ::class_name() and ::class_symid() to any class
 	definition (instead of the previous ::classname() and ::classid(),
 	the latter which had a confusing similarity to the ::ClassId()
 	method on Unidraw components).  NOTE: this is a less-than 100%
 	backward compatible change to the OverlayUnidraw API, and may
 	require changes in third-party code that makes use of the macro.
	
	* add a call to Observable::notify at the end of
 	OverlayComp::SetAttributeList (something that gets invoked when an
 	attribute editing dialog box gets OK clicked).  By default this
 	invokes OverlayComp::update, which calls OverlayComp::Notify, so
 	the ::notify method (used for generic observable/observer
 	notification) quickly gets transmuted into a subject/view sort of
 	Notify/Update. However a derived class can override this (by
 	providing a different ::update method), keeping the two tracks of
 	notify/update separate, which is exactly what happens in NodeComp
 	described below.

	-- ComUnidraw --

	* create ComUnidraw/plotfunc.(ch) to hold BarPlotFunc and the
 	forthcoming LinePlotFunc and ScatPlotFunc.

	* set up a :newview argument to the barplot func, to make plotting
 	in the current viewer the default behavior.  

	* wrap an OverlayKit::bincheck("plotmtv") around the
 	comterp->add_command for the barplot func.

	-- GraphUnidraw -- 

	* make each end-node an Observer of each start-node (whenever an
 	edge connects two nodes).  Create this observer/observable link in
 	the EdgeConnectCmd, remove it within a GraphDeleteCmd, and restore
 	it after a graphdraw document is newly opened.

	* use this new observer/observable mechanism between nodes to
 	trigger a dataflow process, where each node recomputes its :value
 	attribute based on a :valexpr attribute when told to ::update
 	itself.  Nothing happens if no :valexpr attribute exists.  The
 	command that makes up a valexpr assumes in1, in2, etc.. are
 	predefined.  The NodeComp::update method goes out and gets these
 	values and builds up a string for ComTerp to evaluate that first
 	sets the values within the interpreter, then executes the
 	:valexpr.  The result is place back within a :value attribute.

	* Here is an example of a graphdraw document with embedded
 	dataflow. The executable script (the :valexpr) with each of the
 	three computational nodes represent the AND, OR, and NOT operators
 	of 4-value Null Convention Logic, 4NCL (http://www.theseus.com):


graphdraw(5,5
    gs( :fillbg 1 :brush 65535,0 :fgcolor "Black",0,0,0 :bgcolor "White",1,1,1 :font "-*-helvetica-medium-r-normal-*-12-*-*-*-*-*-*-*","Helvetica",12 :graypat 1),
    gs( :fillbg 1 :brush 65535,0 :fgcolor "Black",0,0,0 :bgcolor "White",1,1,1 :graypat 0),
    node( :reqlabel 1 :ellipse 300,458,35,20 :ellipsetrans 1,0,0,1,15,36 :text 12,"NOT" :texttrans 1,0,0,1,302.5,487 :gs 0 :valexpr "if(in1=='I'||in1=='N' :then in1 :else !in1) /* NOT */" :val N),
    node( :reqlabel 1 :ellipse 300,458,35,20 :ellipsetrans 1,0,0,1,-102,-33 :text 12,"AND" :texttrans 1,0,0,1,185,418 :gs 0 :valexpr "if(in1=='I'||in2=='I' :then 'I' :else if(in1=='N'||in2=='N' :then if(in1=='N'&&in2=='N' :then 'N' :else 'I') :else in1&&in2)) /* OR */" :val 'N'),
    node( :reqlabel 1 :ellipse 300,458,35,20 :ellipsetrans 1,0,0,1,151,-34 :text 12,"OR" :texttrans 1,0,0,1,442.5,418 :gs 0 :transform 1,0,0,1,0,1 :valexpr "if(in1=='I'||in2=='I' :then 'I' :else if(in1=='N'||in2=='N' :then if(in1=='N'&&in2=='N' :then 'N' :else 'I') :else in1||in2)) /* OR */" :val 'N'),
    node( :reqlabel 0 :ellipse 178,503,35,20 :ellipsetrans 1,0,0,1,-118,-3 :text 16,"" :texttrans 1,0,0,1,60,485 :gs 0 :val 'N'),
    node( :reqlabel 0 :ellipse 172,341,35,20 :ellipsetrans 1,0,0,1,-116,15 :text 16,"" :texttrans 1,0,0,1,56,341 :gs 0 :val 'N'),
    edge(85,486,173,439 :arrowscale 1.5 :tail :startnode 3 :endnode 1 :gs 1),
    edge(82,369,172,412 :arrowscale 1.5 :tail :startnode 4 :endnode 1 :gs 1),
    edge(222,439,291,480 :arrowscale 1.5 :tail :startnode 1 :endnode 0 :gs 1),
    edge(341,481,425,438 :arrowscale 1.5 :tail :startnode 0 :endnode 2 :gs 1),
    edge(233,425,416,424 :arrowscale 1.5 :tail :startnode 1 :endnode 2 :gs 1)
)

	* add these methods to ease access of other components from an
 	EdgeComp:

    EdgeComp* EdgeIn(int n) const;
    // return pointer to nth incoming edge.

    EdgeComp* EdgeOut(int n) const;
    // return pointer to nth outgoing edge.

    EdgeComp* EdgeByDir(int n, boolean out_edge) const;
    // return pointer to nth edge of given direction.

    NodeComp* NodeIn(int n) const;
    // return pointer to node on other side of nth incoming edge.

    NodeComp* NodeOut(int n) const;
    // return pointer to node on other side of nth outgoing edge.

	* add these methods to ease access of other components from an
 	NodeComp:

    NodeComp* NodeStart() const;
    // return pointer to start node.

    NodeComp* NodeEnd() const;
    // return pointer to end node.

Configuration, Documentation, and Miscellaneous Changes

	* add PERCEPS (http://friga.mer.utexas.edu/mark/perl/perceps/)
 	extractable documentation to the header files of these class
 	libraries: Attribute, ComTerp, OverlayUnidraw, GraphUnidraw.
  	Result can be found at
 	http://www.vectaport.com/ivtools/doc/classes/index.html.

	* add man pages from iv/src/man/(Dispatch|InterViews|Unidraw) to
 	src/man/man3/.  Also put them online at
 	http://www.vectaport.com/ivtools/doc/man3.1/

	* add PostScript copy of InterViews 3.1 reference manual.  Also
 	put up online at http://www.vectaport.com/ivtools/doc/refman3.1/

	* add in PERCEPS class comments with URLs to point to man page
 	from InterViews 3.1 (i.e. href=../man3.1/Border.html) to be
 	embedded in PERCEPS generated web pages, as well as comments with
 	reference manual web page URLs.
	
	* add output of attributes when serializing a toplevel
 	FrameUnidrawComp or GraphUnidrawComp.

	* fix Solaris build problems with OverlayUnidraw/grayraster.c and
 	utils/ivdl, thanks to feedback from Dan DeJohn at Digicomp.

	* same fixes apply to an Alpha build, given feedback from Bruno
 	Delfosse at Thomson CSF.


December 23rd 1998 ivtools-0.7.2

Drawing Editor Changes

	* enable deferred loading of rasters-by-URL, similar to the
 	deferred loading of PGM/PPM rasters.  Tested with the following
 	flipbook document, which brings up the first frame, and loads the
 	subsequent frames only when moved to:
	
flipbook(
    frame(),
    frame(
        raster("http://www.nps.gov/apis/photo1.jpg" :transform 1,0,0,1,120.5,271)
    ),
    frame(
        raster("http://www.nps.gov/apis/photo2.jpg" :transform 1,0,0,1,120.5,271)
    ),
    frame(
        raster("http://www.nps.gov/apis/photo3.jpg" :transform 1,0,0,1,120.5,271)
    ),
    frame(
        raster("http://www.nps.gov/apis/photo4.jpg" :transform 1,0,0,1,120.5,271)
    )
)

	* set up a continuously-looping slideshow mechanism for flipbook,
 	invoked by a "-slideshow secs" command line argument or a
 	":slideshow secs" attribute in the flipbook document.  At present
 	requires building with ACE (or downloading Linux binaries).
  	Typing "exit" into stdin or Ctrl-Q through the GUI will terminate
 	the show. See this URL for sample on-line slideshows:

	http://www.vectaport.com/ivtools/slideshows.html

	* glyphify the precise move/scale/rotate dialog boxes in
 	drawtool/comdraw/flipbook/graphdraw (under the Edit menu).  This
 	leaves only the precise page dialog box (under the View menu) left
 	to be glyphified.

	* test the new comdraw funcs described below with a script like
 	this entered into stdin:

	for(x=0 x<100 x++ :body ellipse(rand(0,ncols-1),rand(0,nrows-1),rand(20,30),rand(10,20));rotate(rand(1,180));update;colors(rand(1,ncolors) rand(1,ncolors));pattern(rand(1,npatterns)))

	** happy random jelly beans **

Interpreter Changes

	* add rand([minval,maxval]) and srand(seedval) funcs to comterp.

	* add :string argument to print(fmtstr val) func, to cause the
 	output to be pushed on the stack in the form of a string.

	* update documentation (both README and man pages) for comterp and
 	comdraw.

	* add comdraw funcs to return menu sizes: nfonts(), nbrushes(),
 	npatterns(), and ncolors().

	* add comdraw funcs to return onscreen extent of canvas in pixels:
 	ncols() and nrows().

	* generalize the timeexpr func to take a :sec argument, and
 	include this func in a comterp built with ACE (server mode).

Library Changes

	-- ComTerp --

	* generalize the timeoutscript mechanism on the ComterpHandler to
 	take a seconds argument as well (ComTerpHandler::timeoutseconds()).

	-- IVGlyph --

	* add a GFieldEditor::select_all method, to facilitate its use
 	from new precise move/scale/rotate dialog boxes.

	* extend StrEditDialog to accept an arbitrary extra glyph.

	* generalize RadioEnumEditor to allow for horizontal layout and no
 	frame.

	-- OverlayUnidraw --

	* set up OvPreciseMoveCmd, OvPreciseScaleCmd, and
 	OvPreciseRotateCmd, to allow for the glyphification of the
 	"Precise" command dialog boxes.

	* create an OverlayGraphic::new_painter() for use by
 	OverlayUnidraw to slip in an OverlayPainter for the default
 	Graphic Painter (Graphic::_p).  It was discovered that every
 	OverlayRasterRect was creating a new OverlayPainter and stuffing
 	it in Graphic::_p, which wasn't a problem, until I tried to defer
 	the loading of rasters-by-URL.  This meant that the Painter was
 	engaged in rendering the raster before the final OverlayRasterRect
 	was constructed, which caused the Painter currently being used to
 	be deleted (oops).

	-- FrameUnidraw --

	* create a FrameEditor::InitCommands (invoked by the ::Resize
 	method on the viewer) to initialize the slideshow mechanism.

Configuration and Miscellaneous Changes

	* change the construction of the toolbar glyphs, to use a
 	layout.vflexible with infinite stretchability and 0
 	shrinkability. This works to make the whole toolbar automatically
 	appear no matter how long, and obviates the need to have a funky
 	constant that guesses how many pixels long the toolbar really is.

	* switch flipbook from using a Dispatcher based ComTerpIOHandler
 	on stdin to using a Reactor based UnidrawComterpHandler (when
 	built with ACE).  This facilitates the use of the timeexpr func in
 	the flipbook slideshow mechanism.  In the future the older
 	Dispatcher mechanism could handle the slideshow mechanism as well
 	(since timer objects are supported by the Dispatcher).

December 4th 1998 ivtools-0.7.1

Drawing Editor Changes

	* add support for %s embedding in print and export dialog box
 	command strings.  This facilitates the cat'ing of a file to a
 	device (i.e. cat %s >/dev/lp1), and use of utilities like pstoedit
 	(i.e. "pstoedit -f tgif %s /tmp/temp.obj;tgif /tmp/temp.obj") from
 	these dialog boxes. If no %s is found when the "to command" button
 	is checked, the command line is built up the old way, by appending
 	the pathname of the temporary file used for rendering output.  So
 	"ghostview" will still work, as well as "ghostview %s".
	
	* propagate the stay-on-grid bugfix that was introduced in
 	ivtools-0.7 down to idraw.
	
	* recognize and accept the partial idraw format generated by
 	xfig2idraw (idraw already could handle it)
	
	* add full URL support for black-and-white JPEG's and GIF's (color
 	and graylevel were already handled).

Interpreter Changes

	* fix :abs argument on flipbook moveframe func.  Now on a
 	four-frame flipbook these work equally as well:


  for(i=0 i<100 i++ :body 
      for(j=0 j<4 j++ :body moveframe(1);update);moveframe(-3);update)

	*and*

  for(i=0 i<100 i++ :body 
      for(j=0 j<4 j++ :body moveframe(1);update);moveframe(1 :abs);update)

	* complete the iueserv example program, a derived comterp that
 	links against the Image Understanding Environment
 	(http://www.aai.com/AAI/IUE/IUE.html).  Now the following command
 	string works to process an image and export it to a drawing
 	editor:

  export(conncomp(threshold(image("test.pgm") 150)) "localhost" 20001)

Library Changes

	-- ComTerp --

	* fix bug in post-evaluation handling of keyword arguments with no
 	associated values.  See flipbook example above.
	
	-- Unidraw --

	* second attempt to fix the interaction of the Modified (dirty)
 	state variable and the New command.  This time, when
 	ModifStatusVar::SetComponent is called, a check is made to ensure
 	the new component is actually different than the old component
 	before clearing the modified flag.

Configuration and Miscellaneous Changes

	* remove conflicting include of memory.h that impacted a Solaris
 	build in these file: Attribute/attrvalue.c, IV-2_6/textbuffer.c,
 	and IV-2_6/texteditor.c.

	* add back the need for XCONFIGDIR for "make World" in the INSTALL
 	file.

	* expand the Acknowledgements section of the README.

	* incorporate changes suggested by Debian ivtools-0.6.7-4 (the
 	last packaging for the slink release of Debian).

	* rename scripts/install.sh to scripts/install-sh, to avoid a make
 	rule that would automatically create a confusing (to make) install
 	file.


November 12th 1998 ivtools-0.7

Drawing Editor Changes

 	* ivtools drawtool (and every drawing editor that inherits the
 	same mechanism) can now import or open a wide variety of graphics
 	file by URL.  This is done with a separate ivtools executable,
 	ivdl, written by Eric Kahler, which makes a straightforward
 	attempt to connect to any http or ftp server and download the
 	requested file.  Any error messsages are printed to stderr.

	This means that ivtools now supports hyper-structured-graphics, as
 	defined (invented?) by William Chia-Wei Cheng, the author of Tgif:

		http://bourbon.cs.umd.edu:8001/tgif/hgviewer.html

	To try it out, acquire or build a copy of ivtools drawtool, and
 	launch it on this URL:

	        http://www.vectaport.com/ivtools/anteaters.drs

	* In addition to URL support, ivtools drawtool supports launching
 	or importing (to an import port if built with ACE) on any JPEG,
 	GIF, TIFF, or pbmplus image file, any idraw format PostScript, and
 	non-raster portions of any arbitrary PostScript file.  These
 	capabilities require the use of the following executables
 	distributed separately from ivtools: djpeg, giftopnm, tifftopnm,
 	pstoedit.	

	* ivtools drawtool supports launching or importing of any graphic
 	file compressed by gzip or compress as well.	

	* The "auto-convert" check-box on the import dialog box has been
 	removed (by default).  This feature is still available for use in
 	custom applications, or the same effect can be had by entering an
 	"anytopnm" command line into the import dialog box, and selecting
 	the "from command" checkbox before hitting the Import button.	

	* this release fixes a very old stay-on-grid-when-zooming problem
 	in drawtool.  The changes ended up being very minor, and will be
 	propogated to idraw by ivtools-0.7.1, but for now they exist only
 	in drawtool to facilitate independent verification that the
 	problem is gone.

	This might have been one of the inadvertent reasons why Fresco
 	went to all floating-point coordinates.  In the Unidraw graphics
 	library, the graphics are all rendered in integers (collected from
 	the screen coordinates of the original drawing events), then
 	mapped to a floating point drawing coordinate system with a
 	floating point affine transform.  There was an unsolved problem
 	with this strategy, and you can reproduce it in idraw with these
 	steps:

	0) turn on the grid (?) and gravity (,)
	1) zoom in once
	2) pan left once (while at 2x magnification)
	3) zoom back to 1x magnification
	4) draw a rectangle 
	5) zoom in four times or so -- you'll see rectangle isn't on grid

	The reason is that the pan at 2x is really the equivalent of a
 	fractional pan at 1x, so when you get back to 1x the grid is no
 	longer on an integer boundary, but halfway between pixels.  Of
 	course this is impractical for drawing the grid, so the grid
 	coordinates are rounded before rendering.  The same thing is done
 	for the x,y coordinates of the mouse events in Grid::Constrain.

	The resultant rectangle looks great at 1x, where the rounding
 	effects on the grid display match up with the integer-constrained
 	coordinates that define the rectangle.  But as you zoom in, the
 	grid positions are no longer rounded, and you see the error
 	between the actual grid location and the rectangle drawn with
 	gravity on.

	The fix was to simply ensure that the transformer used to
 	construct a graphic when gravity is on would always produce
 	integerized drawing coordinates, by rounding the last two
 	arguments of the affine transform used to map from screen
 	coordinates to drawing coordinates.  This counters for the
 	necessary rounding effect when x,y events are constrained
 	(Grid::Constrain) not to the actual floating point location of the
 	grid, but to the nearest pixel.  Try the above directions in an
 	ivtools-0.7 copy of drawtool, and you'll see the problem is gone.

	Bug reported by Larry Larson and others.

Server Changes

	* a new server, iueserv, was set up to begin experimenting with
 	the packaging of the extensive capability of the Image
 	Understanding Environment class libraries into the command
 	language of comterp.  The IUE is available from:

		http://www.aai.com/AAI/IUE/IUE.html

	--with-iue and --with-iue-libs arguments were added to the
 	configure script to facilitate this.  See src/iueserv/README for
 	more details.

	* add affine transform funcs to comterp, to assist in debugging:

	point=xform(x,y a00,a01,a10,a11,a20,a21) 
		-- affine transform of x,y coordinates
	affine=invert(a00,a01,a10,a11,a20,a21) 
		-- invert affine transform
	
Utility Changes

	* incorporate a URL downloading utility written by Eric F. Kahler,
 	now called ivdl, into the src/utils directory.

Library Changes

	-- IVGlyph --

	* make changes to the ::accept_editor methods of OpenFileChooser
 	and ImportChooser to recognize a URL and avoid pre-processing it
 	like it was a local pathname.

	-- Unidraw --

	* fix bug where the modified flag on a drawing editor was getting
 	inadvertently cleared when the user does the following:

	     - open and modify a drawing
	     - invoke open again, and say No to saving the drawing
	     - type in the same pathname

	The result is that the system recognizes the drawing is the same,
 	and does not reload it, but clears the modified flag without ever
 	saving it.  This is now fixed.  Bug reported by K.C. Ng.

	-- OverlayUnidraw --

	* the majority of work on URL open/import, and compressed image
 	open/import was done in the OvImportCmd.  One evolution (from
 	ivtools-0.6.12) was the use of the ::pathname() method to indicate
 	when a file was coming from a file (instead of just a pipe), which
 	would then allow the import command to configure a filtering
 	command to be popen'ed.  Without knowing the pathname (or when the
 	pathname was an URL or "-"), there was a need to use
 	double-fork/double-pipe architecture, with the child reading the
 	source and writing to the grandchild, and the grandchild exec'ing
 	the filter, causing the result to be written back to the original
 	process. 

	* support for GIF and JPEG file formats was extended by extending
 	the RasterOvComp istream constructor to invoke an OvImportCmd to
 	read them in.  In this way GIF and JPEG files can be
 	saved/restored by pathname, in the same manner long supported
 	for TIFF and pbmplus raster files.

	-- GraphUnidraw -- 

	* fix bug in Alter tool (RESHAPE_TOOL) to make it set the modified
 	flag when something is changed.

	* fix another bug in Alter tool, reported by K.C. Ng, that caused
 	the recreated TextGraphic to have a foreground color with a nil
 	name.

	* finally, fix old problem with moving more than one arc reported
 	by K.C. Ng as well.  The problem occurred when two arcs were
 	selected then moved -- nothing would happen.  This had been
 	disabled a long time ago, because there was a solution in place to
 	handle moving one edge (the CreateManipulator pre-selected the
 	nodes on each end of the edge as well), but there had never been a
 	solution for more than one edge at once.  The fix was simple, in
 	that it only required a derived MoveTool (GraphMoveTool) with a
 	single derived method of note, ::InterpretManipulator, that checks
 	for a selection list longer than 1, and runs through it to augment
 	the selection with any nodes that lie between selected edges.
	

Config/Build Changes

	* a new library, AceDispatch, was set up to isolate any use of the
 	ACE library from the InterViews Dispatch library.  In this way
 	older executables, like idraw, can run without any reference to
 	ACE shared library.	

	* further work was done to isolate older executables from newer
 	shared libraries.  This required #ifdef 0'ing all the OTHER_* make
 	variables defined in config/params.def (OTHER_CCFLAGS,
 	OTHER_CCDEFINES, OTHER_CCINCLUDES, OTHER_CCLDLIBS,
 	OTHER_CCDEPLIBS) and instead defining them within the relevant
 	Imakefile's.  For example, src/comterp/Imakefile has these new
 	definitions:

	OTHER_CCDEFINES = $(ACE_CCDEFINES)
	OTHER_CCINCLUDES = $(ACE_CCINCLUDES)
	OTHER_CCLDLIBS = $(ACE_CCLDLIBS)

	* extraneous arguments were manually trimmed from the configure
 	script generated by autoconf from configure.in.  This process
 	needs to be repeated each time autoconf is run until the time
 	someone figures out how to change configure.in to remove the
 	Cygnus-standard options that are not utilized in the ivtools
 	setup.