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idt - X window interactive image display tool
idt [ -toolkitoption ... ] [ -background color ] [ -f font ] [ -foreground color ] [
-history ] [ -lmin min ] [ -lmax max ] [ -lscale scale ] [ -oldidt ] [ -pal pal_fname ] [
-reverse ] [ -soft ] [ -Version ] [ metafile ]
idt provides a graphical user interface to the NCAR View interactive metafile translator
ictrans. idt supports a subset of the ictrans command interface.
idt provides two types of command panels for interacting with imagery. The first type is
the control panel, which you see when you initially invoke idt. The control panel
displays messages from the translators, provides a metafile selection utility and is
responsible for instantiating the second type of command panel, the display panel. The
display panel provides mechanisms for controlling translators. Each display panel manages
a single metafile translator. There can be multiple display panels in existence at the
same time but only one control panel.
idt accepts all of the standard X Toolkit command line options (see X(1)). idt also
accepts the following options:
Fontcap file to be used for stroking text. When interpreting CGM TEXT command
elements use fontcap as the default font for textual translation. Note: CGMs may
contain textual descriptions which are not embedded in CGM TEXT elements. Hence
they are not influenced by fontcap specifications. Note also that a CGM may
explicitly specify a named font which may override a font provided on the command
line. The environment variable FONTCAP may also be used to specify a default
If fontcap is preceded by a UNIX directory path then ctrans will look in that
directory for the specified fontcap. Otherwise idt searches the directory
$NCARG_ROOT/lib/ncarg/fontcaps for the fontcap.
See fontcap(5NCARG) for a description of the available fontcaps. See fcap(1NCARG)
for a list of the fontcaps installed on your system.
This option overrides the FONTCAP environment variable.
Write a record of all commands sent to the translator to the file ./.idthist.
Print the version number and then exit.
The following options are ignored by idt and are passed on to the metafile translator
ictrans. See ictrans(1NCARG) for a description of their use.
CONTROL PANEL COMMANDS
The control panel provides a text widget for displaying messages from the translators and
a row of command buttons. Messages are preceded with the string "Display[X]", where "X" is
an integer id associated with the translator sending the message. The first translator
spawned is "Display", the second is "Display", etc.
Selects a file for translation. This button brings up a popup menu containing a
file selection box. The uppermost dialog box of the file selection box is used for
specifying a filter for searching for files. For example, the filter
"/usr/local/lib/*.cgm" finds all files in the directory /usr/local/lib whose names
end with ".cgm". The finder understands standard shell metacharacters.
The bottom dialog box displays the currently selected file. The user may enter a
file name here or select one with the mouse from the list of files displayed in the
middle text widget.
Popup a display panel. A display panel is popped up ready for translation of the
file most recently selected with the file selector. This command will fail if a
file has not been selected.
quit Quits the application and terminates all translators.
DISPLAY PANEL COMMANDS
The display panel provides a mechanism for manipulating the translator associated with a
particular metafile. On most systems the name of the metafile appears in the title bar at
the top of the panel. The first row in the panel contains a scroll bar for randomly
selecting a frame to be translated. The label bar to the right displays the number of the
frame scrolled to. The panel is intended to resemble a video tape editor. Thus, the second
row contains play back, jog back, stop, jog and play buttons, respectively. The third and
forth rows contain more complex display commands.
loop Toggle the looping mode on or off. When loop is on pressing the play (playback)
button causes the translator to process all the frames in the segment sequentially
(reverse sequentially) and then start over from the beginning (end). The process
continues until the "stop" button is selected. By default loop mode is off.
dup Sets duplication variable. If dup is set to 1 each frame is displayed once, if dup
is set to 2 each frame is displayed twice, etc. The default value of dup is 1.
goto Go to the specified frame and translate it. goto provides random access to the
frames contained in the metafile.
skip Set the skip variable. If skip is set to 1 every other frame is displayed during
subsequent plays, if skip is set to 2 every third frame is displayed, etc. The
default value for skip is 0.
delay Set the between-frame animation delay-time. When idt is in animation mode you may
request that idt pause for a period of time between the display of each image. The
effect of setting a delay time is to govern the speed at which idt "plays" imagery.
Define the first frame in the segment. This button and the stop segment button
define a segment which is a subset of the frames contained in the metafile. When in
play (playback) mode only the frames contained within the defined segment are
translated. The default value for start segment is 1, the first frame in the file.
Define the last frame in the segment. The default frame is the last frame in the
file. Hence, by default the segment is the entire metafile.
Specify the workstation window (in the GKS sense). Four coordinates are specified
which define a rectangular window which is a subset of normalized VDC rectangle
with corner points (0,0) and (1.0,1.0). The specified window is then mapped onto
the entire viewport. For example, if the workstation window is defined by the
corner points (0,0) and (0.5 0.5) then the lower left quarter of a plot would be
blown up to fill the largest rectangle which fits in the drawing window while
retaining the aspect ratio described by the normalized coordinates. Specification
of such a window can be used for zooming and panning.
done Terminate processing of current metafile.
Update the "Scrolled to Frame ->" label box with the number of the current frame.
print Send the current frame to the printer. The print command brings up a menu of all
devices configured for accepting translator output. This list is created
dynamically in response to changes in the spooler configuration file (see
ncarv_spool(5NCARG)). Selecting an item from the menu causes the current frame to
be sent to that device.
save Save a frame to a file. This command allows you to write the metacode for the
current frame to a file. The result is a complete NCAR Computer Graphics Metafile
(CGM) containing a single frame.
unzoom Reset windowing transformations previously set by the zoom command back to their
zoom Zoom in on an area of a plot. The function of this command is identical to that of
the window command. The zoom command, however, allows you to select the area of
interest interactively with the mouse.
Toggle animation mode on or off. When idt is put into animation mode the currently
defined segment is rasterized with the translator and loaded into the X server
memory. Subsequent idt commands operate on the memory-resident images. Not all idt
commands are available in animation mode. By default animation is off.
As with all standard X applications, idt may be customized through entries in the resource
manager. In the following list of application resources provided by idt the resource name
is given followed by its class in parentheses. These resources supplement the resources
provided by the widgets themselves.
history (Class History)
Specify whether a history of commands sent to the metafile translators is recorded
to the file "./.idthist" or not. The default for this resource is "False".
fileSelectAction (Class FileSelectAction)
Set the default action to be executed after a file has been selected with the file
selection box. Currently the only value this resource understands is "display".
messageHeight (Class MessageHeight)
Set the height in lines of text of the message display panel.
oldIdt (Class OldIdt)
Specifies the "-oldidt" option.
translatorDevice (Class TranslatorDevice)
Specify the output device for metafile translation. The default for this resource
translatorFont (Class TranslatorFont)
Specify the name of the fontcap to use for stroking text during metafile
translation. The default value for this resource is "font1".
translatorSoft (Class TranslatorSoft)
Specifies the ictrans "-soft" option.
translatorLmin (Class TranslatorLmin)
Specifies the ictrans "-lmin" option.
translatorLmax (Class TranslatorLmax)
Specifies the ictrans "-lmax" option.
translatorLscale (Class TranslatorLscale)
Specifies the ictrans "-lscale" option.
translatorForeground (Class TranslatorForeground)
Specifies the ictrans "-foreground" option.
translatorBackground (Class TranslatorBackground)
Specifies the ictrans "-background" option.
translatorReverse (Class TranslatorReverse)
Specifies the ictrans "-reverse" option.
idt provides the following actions for use in event translation:
This action causes the file selector popup to search for files using the key
supplied in the file finder text box.
This action notifies the file selector that a selection has been made.
This action updates the text box in the file selector which displays the currently
This action confirms a selection made in one of the display panel popup dialog
In order to specify resources, it is useful to know the hierarchy of the widgets which
make up idt. In the notation below, indentation indicates hierarchal structure. The
widget class name is given first, followed by the widget instance name.
Command select file
Core canvas /* This is the drawing canvas
Label Scrolled to Frame ->
Command start segment
Command stop segment
Command set window
Command current frame
The following resource specification can be used to set the default size of the graphics
display window to 200 by 200 pixels:
If you want to place the control panel in the top right corner insert the following into
your .Xdefaults file:
This is the standard X environment variable for specifying display name. If the
translation output device is X11 this variable MUST be set.
Default fontcap specifier.
Path to root of NCAR Graphics installation.
If set this variable contains the path to the installed NCAR Graphics libraries.
NCARG_LIB overrides NCARG_ROOT.
If set, this environment variable contains a directory path to be used for
temporary files. On most systems the default is /tmp. On some systems the default
SHELL Specifies the UNIX shell that the file selector is to use for expanding
metacharacters. /bin/sh is used by default.
Specifies the name of a resource file that overrides the global resources stored in
the RESOURCE_MANAGER property.
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