Ubuntu Manpage: xganim

NAME

       xganim

DESCRIPTION

xganim is a tool for animating a series of GRASS raster files. At startup, a graphics
window is opened containing VCR-like button controls for: rewind, reverse play, step back,
stop, step forward, forward play, loop, swing, slower, faster, show filenames, current
frame number, and Exit. The image is displayed above or to the left of the controls. Each
raster map is read into memory, then the animation is played once beginning to end. The
user may then replay the series or play continuous animation by using the buttons.

The user may define up to four "views", or sub-windows, to animate simultaneously. e.g.,
View 1 could be rainfall, View 2 flooded areas, View 3 damage to bridges or levees, View 4
other economic damage, all animated as a time series. There is an arbitrary limit of 400
files per view (400 animation frames), but the practical limit may be less depending on
the window size and amount of available RAM.

The environment variable XGANIM_SIZE is checked for a value to use as the dimension, in
pixels, of the longest dimension of the animation window. If XGANIM_SIZE is not set, the
animation size defaults to the rows & columns in the current GRASS region, scaling if
necessary to a default minimum size of 600 and maximum of 900. The resolution of the
current GRASS region is maintained, independent of window size. Resizing the window after
the program is running will have no effect on the animation size.

UNIX - style wild cards may be used with the command line version in place of a raster map
name, but it must be quoted.

If the number of files differs for each view, the view with the fewest files will
determine the number of frames in the animation.

EXAMPLE


       export XGANIM_SIZE=800
       xganim view1="rain[1-9]","rain1[0-2]" view2="temp*"

NOTES

       For  wildcard  matching,  xganim understands whatever the shell understands (as it invokes
       "ls" via the shell to expand wildcards).  E.g., a user can use "rast[0-9][0-9]"  to  match
       "rast00"  through  "rast99"  inclusive.   If  the maps if interest have varying numbers of
       digits, multiple patterns can be combined, e.g.:
       export XGANIM_SIZE=1000
       xganim view1=rast[0-9],rast[1-9][0-9]
        to match rast0 through rast99 inclusive.

BUGS

       On some displays that need to use private colormaps,  the  interface  buttons  may  become
       difficult to see.

AUTHOR