next up previous contents index
Next: CHANGE LUT Up: GTVL Language Internal Help Previous: Language   Contents   Index


CHANGE

        [GTVL\]CHANGE Item SegName Value [Val2 [Val3]]
        [GTVL\]CHANGE Behaviour Value

    Changes  some  attribute  of  the Graphic Library. Two items concern the
    current directory and active windows:
      - CHANGE DIRECTORY DirName [WinNum]
          changes the default directory to DirName, and optionally  the  ac-
          tive window number to WinNum (instead of 1) within this directory.
          The current working directory is stored as a character  string  in
          the SIC variable GTV%PWD.
      - CHANGE WINDOW WinNum|ZOOM
          changes  the active window number to WinNum or to the ZOOM window.
          The active window is in particular the one in which the cursor ap-
          pears for commands which use it.

    Some other items are image segment attributes:
      - CHANGE SCALING    SegName LIN|LOG [Lcut [Hcut]]
          will change the transfer function for the specified image segment.
      - CHANGE BLANKING   SegName BLACK|WHITE|Colour
          will change the colour of blanked pixels (if any) in the displayed
          image. Colour is a colour value as in PENCIL command (1-8).
      - CHANGE COLOUR     SegName Value
      - CHANGE DASH       SegName Value
      - CHANGE DEPTH      SegName Value
      - CHANGE VISIBILITY SegName ON|OFF
      - CHANGE WEIGHT     SegName Value
    The  last  five items are general segment attributes. For these, if Seg-
    Name is a segment, only that segment is modified, but if it is a  direc-
    tory,  all segments attached to this directory are modified accordingly.
    See subtopic SEGMENT_NAMES for details on naming segments.

    And finally, some general behaviours can be changed will  the  following
    keywords:
      - CHANGE LUT STATIC|DYNAMIC
          toggles  the  Look-Up-Tables to STATIC or DYNAMIC mode. Default is
          DYNAMIC. See subtopic LUT for details.
      - CHANGE PENCIL HARD|SOFT
          specifies whether the GTV library should use  the  (output  depen-
          dent)  hardware  generator for dashes and thickness, or whether it
          should use its own (output independent) software emulation.  Hard-
          ware  generator  may (or may not) produce nicer output, and may be
          faster...
      - CHANGE POSITION
          changes the window position on the screen. See  subtopic  for  de-
          tails.


Subsections

Gildas manager 2014-07-01