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       xjig - the jigsaw puzzle


       xjig <options>


       XJig is a puzzle, that tries to replicate a jigsaw puzzle on the screen
       as close as possible. As in every jigsaw puzzle, the goal is to set all
       the pieces together. If you like, you can watch the time that you spent
       for it.

       Any image-file in GIF, JPEG, or PPM format can be used  as  the  source
       for  the  puzzle,  which  is  then randomly created regarding the sizes
       selected by the options.

       The control should be as intuitive as possible in the way that you will
       usually  pull the freely rotatable pieces at one edge, drag them to the
       desired destination and drop them so they  will  snap  together  easily
       when close to an neighboured tile.


       Tiles  are freely formed and rotatable with texture mapping routines to
       give the appearance of a real mess on the screen.

       Tiles snap together very easy if they are dropped  somewhere  close  to
       another matching tile, when turned in the correct direction.

       Puzzles can be doubled sided so you might have to flip the tiles to the
       correct side to let them snap together.

       If the Xserver supports the Shape-Extension, the tiles  can  be  opened
       directly  on  the  desktop,  which is a pretty showcase, but you need a
       very fast machine for really getting this playable. (Any ideas  on  how
       to add double buffering to the shaped-window approach of the jigsaw are
       warmly welcome!)


       The usual way to move the pieces on the screen should be  to  drag  the
       piece  with  the left mouse button to their destination by pulling them
       at on edge.  The piece will automatically rotate like if  you  pull  or
       push them with your fingertip on a table.

       In addition, the following movements are possible:

         click left:        rotate 90 degrees left
         click right:       rotate 90 degrees right
         click middle:      flip tile to backside
         drag left:         rotator drag (as mentionned above)
            +middle:        pause rotator drag for a straight drag
         drag middle:       straight drag
            +left:          pause drag for a static rotation
            +click left:    rotate 90 degrees left during drag
            +click right:   rotate 90 degrees right during drag
         CTRL+click left:   same as click middle

       The  right  button  has  actually  the same functionality as the middle
       button so that 2 button systems shouldn’t have problems. Only the "drag
       middle+click  right"  move will not work in that mode, and the flipping
       has to be done with the help of the CTRL-key.


   Tile Selection
       -file name  use the specified file as the source image for the puzzle

       -side p     select the side of the image to be on  top,  if  you  don’t
                   like the mess with the double sided tiles.

   Size Selection
       -w x        Select  number of tiles in horizontal direction. The Images
                   are automatically rotated in  portrait  orientation  before
                   they are sliced. Therefore x usually should be smaller than
                   y of the next option. The default is four.

       -h y        Select number of tiles in vertical direction  respectively.
                   The default is six.

       -ts n       Select average tile width. Instead of explicitly specifying
                   the number of tiles by using the previous  options  -w  and
                   -h,  the  average  tile width in pixels can be selected and
                   the values for x and y above are computed according  to  to
                   the selected size.

   Image Options
       -ww x       Select  width of image in pixels. This can be used to scale
                   the image before playing for the case  that  a  very  large
                   image is the source.

       -wh h       Select  height  of  image in pixels. If only one of -ww and
                   -wh, the aspect ratio is kept constant.

       -no_crop    The image is  usually  automatically  cropped,  since  many
                   images  are  surrounded  by frames or textual comments. The
                   cropping stops at a reasonable amount of colors per line or
                   row.  If  this is not desired of if you want to puzzle with
                   painted images with few  color,  you  should  disable  this

       -no_flip    Before  tiling takes place, a landscape image is rotated to
                   portrait mode, which effects successive options like -w  or
                   -ww.  If  this  is not desired, you can switch this feature

   X-Window options
       -display name
                   Select the display to connect to.

       -shapes     If the SHAPE-extension is supported by  your  display,  you
                   can  use  this option to let each puzzle tile appear in its
                   own  shaped  window.  The  results  might  depend  on   the
                   behaviour  of  the  window-manager. The manager is actually
                   advised by the override  redirect  attribute  flag  of  the
                   puzzle  shapes  not to do anything with them. But who knows

       -no_shm     When the program was build  with  support  of  the  MIT-SHM
                   extension,  it  might  crash  when  started to display on a
                   remote machine or X-terminal. You can deselect the usage of
                   the extension with this option.

       -no_anim    Turns  off animation of rotation and flipping, for the case
                   the machine isn’t fast enough to make it look nice.


       For not losing  tiles  at  the  window  border  and  for  getting  more
       workspace,  the  game  has some zooming and panning features to control
       the view on your desk. They are controlled via the  keyboard  with  the
       following functionality:

         Cursor Keys:       Pan View
         Page-Up or Add:    Zoom in
         Page-Down or Sub:  Zoom out
         Home:              Reset to original size
         End:               Set maximum zooming to view all tiles

       The  image  quality  usually suffers from zooming, since gif-images are
       usually dithered to be viewed best in their original size.   This  also
       applies to the size options -ww and -wh.

Color Allocation

       The  program  was  tested  on  PseudoColor- and TrueColor-displays.  On
       PseudoColor-displays the program might run out of colors, since  colors
       are  very limited and it has to share its colors with other clients. It
       tries to share similar colors with other clients.  But if too may color
       consuming  clients  are  running,  the  image-quality  will suffer. You
       should stop other clients in that case or you might quantize the  image
       to  a  fewer  number  of  colors  with packages like ImageMagick, xv or


       X(1), convert(1), xv(1), ppmquant(1)


       Copyright 1996, Helmut Hoenig, Heiligenhaus

       email (for any comments):

       smail (for gifts):
               Helmut Hoenig
               Hopfenstrasse 8a
               65520 Bad Camberg


                 By the way, I am collecting banknotes! If you want
                  to join into my collection, get any bill of your
                 country, sign it on the backside and send it to me
                          so I will pin it on my world map.
                  (Don’t forget the exact location for the pin :-)
                But you can also just send me a picture postcard ...


       Permission to use, copy, modify, and distribute this software  for  any
       purpose  and  without  fee  is  hereby granted, provided that the above
       copyright notice appear in all copies.

   other fancy things from the author
       xcol (1990)    - color selector for editing text-files
       flying (94/95) - pool billard simulation
       xdefmap (1995) - enhanced tool for setting up standard colormaps
       xmemory (95/96)- memory with simultaneous multiplayer action

       available at and its mirrors