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           The  metafile  graphics  format  was  designed with the primary goal of
           serving as a temporary file for routines which output to dot-matrix and
           other line-at-a-time devices.  As a result, all of the "primitives" are
           completely self-contained to facilitate sorting.
           A primitive is a command  which  can  itself  be  plotted.   Into  this
           catagory  fall  line segments, rectangle and triangle fills, matrix and
           vector strings.  Every primitive has a zeroeth argument which  contains
           bundled  attribute  information, and an extent.  The extent gives the x
           and y minimum and maximum values  which  enclose  the  primitive.   The
           extent  is used in sorting, and typically also in describing the primi-
           tive.  For example, a line segment will be described completely by  its
           enclosing  rectangle  and  attributes  including specification of which
           diagonal the segment falls on.  Other primitives will  have  additional
           arguments,  such  as vector string, which must specify the string to be
           output within its extent.
           "Global" commands separate the primitives  and  allow  functions  which
           affect  all  commands.   These are commands such as end of page, pause,
           open and close segment, set, unset and reset, and a special global, end
           of file.  The end of file command is included to facilitate finding the
           end of file on systems which do not keep track  exactly.   Global  com-
           mands sometimes have arguments.  The open command, for instance, speci-
           fies the name of the segment.  Global commands never have extents.
           The metafile commands are as follows:
           F  end of file:  no arguments.
              When end of file is reached, all processing stops.
           E  end of page:  no arguments.
              This causes the device to advance to the next screen  or  page.   If
              the  output device is a terminal, it will beep and wait for the user
              to hit return before clearing the screen.
           P  pause:  arguments specify the message to be printed.
              This causes output to be flushed and the controlling terminal to  be
              opened.   The  user  is then prompted with the specified string fol-
              lowed by the message "- (hit return to continue)".  If no string  is
              specified,  the  bell  is sounded without a message.  After the user
              hits return, output continues.  This command is useful when the user
              is  required  for some part of the output, such as changing paper or
           D  draw global:  no arguments.
              This global forces flushing of output and updating of device.
           I  include file:  arg0 TRUE if standard file.
              The include global causes the contents of the named file to be  sub-
              stituted  in the include command's location.  If arg0 is 1 (TRUE), a
              standard location is searched if the file is not found in the  work-
              an  integer  between  0 and 11.  This selects one from the following
              patterns:  solid, thick \\\, thin \\\, mixed \\\,  thick  ///,  thin
              ///,  mixed ///, crisscross, web.  The default pattern settings are:
              0=P0, 1=P1, 2=P2, 3=P3.  The second form gives the  explicit  values
              for  a  pattern.   The set all command makes a context mark with the
              current settings.  All settings which follow can be undone with  the
              unset all command.
           U  unset:  arg0 specifies what to unset (from meta.h):
              SALL:  return to previous context.
              SPAT0:  set pattern 0 to the previous value.
              SPAT1:  set pattern 1 to the previous value.
              SPAT2:  set pattern 2 to the previous value.
              SPAT3:  set pattern 3 to the previous value.
              The  unset  command  returns  a variable to its previous value.  The
              unset all command returns the settings to the values they had in the
              previous  context.   If no context has been marked by set all, vari-
              ables are returned to their default values.
           R  reset:  arg0 specifies what to reset (from meta.h):
              SALL:  reset all variables.
              SPAT0:  set pattern 0 to the default value.
              SPAT1:  set pattern 1 to the default value.
              SPAT2:  set pattern 2 to the default value.
              SPAT3:  set pattern 3 to the default value.
              The reset command returns a variable to its  default  setting.   The
              reset all command returns all variables to their initial state.
           O  open segment:  arguments specify segment name.
              The  commands following up to a C (close segment) are not to be out-
              put, but are to be stored in the named segment.  Segment  names  can
              contain any ascii character (except newline) in any sequence of rea-
              sonable length.  Segment definitions are local to the enclosing seg-
              ment.  Side effects should be avoided in segments by balancing calls
              to set and unset.  A segment cannot reference itself.
           C  close segment:  no arguments.
              The current segment is closed, which completes  its  usable  defini-
           l  line segment:  fields of arg0 are:
              100:  orientation:  positive slope, negative slope.
              060:  type:  solid, dashed, dotted, dotted-dashed.
              014:  width:  0, 12, 24, 48, 96 units.
              003:  color:  black, red, green, blue.
           r  rectangle fill:  fields of arg0 are:
              100:  toggle:  OR fill, XOR fill.
              014:  pattern:  choice of 4 (see set).
              003:  color:  black, red, green, blue.
              Fills  the  given  extent  with the specified pattern.  Toggle (XOR)
              fill allows the reversal of previous fills to an area.
              100:  border:  no border, line border.
              060:  orientation:  right (& down), up, left, down.
              014:  pattern:  choice of 4 (see set).
              003:  color:  black, red, green, blue.
              The argument string gives a blank separated list of the polygon ver-
              tices in the form:  "x0 y0 x1 y1 x2 y2 ... ".  The coordinates  must
              be  integers ranging between 0 and 16383.  The bounding box and ori-
              entation will be used to fit the original polygon into a scaled  and
              rotated  position.   The last vertex will be connected to the first,
              and the polygon will be filled in with the specified pattern.  If  a
              border  is  requested,  one  will be drawn of solid black zero width
              lines.  All polygon fills will toggle, therefore other  polygon  and
              toggled  triangle  and rectangle fills will affect the final appear-
              ance of the image.  For example,  a  polygon  drawn  inside  another
              polygon of the same pattern will make a hole.
           m  matrix string:  fields of arg0 are:
              100:  strike:  single, double.
              060:  density:  10 cpi, 12 cpi, 17 cpi, 20 cpi.
              014:  size:  normal, double width, double height, double both.
              003:  color:  black, red, green, blue.
              The  upper  left corner of the extent is used to place the beginning
              of the string  specified  after  the  command.   More  sophisticated
              drivers  will use the extent for clipping, but the size of the char-
              acters will not be altered.
           v  vector string:  fields of arg0 are:
              060:  orientation:  right, up, left, down.
              014:  thickness:  0, 12, 24, 48, 96 units.
              003:  color:  black, red, green, blue.
              The string specified following the  command  will  be  made  to  fit
              within the given extent.
           s  print segment:  fields of arg0 are:
              060:  orientation:  right, up, left, down.
              014:  thickness:  0, 12, 24, 48, 96 units.
              003:  color:  black, red, green, blue.
              The  segment  whose  name is specified in the arguments will be ori-
              ented according to arg0 and made to fit in the  given  extent.   The
              thickness and color of the lines in the segment will be changed also
              according to arg0.  In the case of area  fill,  it  is  the  pattern
              rather than the width which will change.  The segment must have been
              previously defined using the open segment global.  Note that  matrix
              strings  will  not  transfer  well  since they cannot be oriented or
           The metafile has two basic formats.  The first format is  meant  to  be
           user readable, and has the form:
               c arg0 xmin ymin xmax ymax 'args
           Where c is the single letter command, arg0 is the octal value for arg0,
           The   standard   location   for  metafiles  used  by  the  programs  is
           /usr/lib/meta/, but can be changed by setting the environment  variable
           MDIR.   This is useful for systems where the owner does not have access
           to the /usr/lib/ directory.  It also allows the user to create his  own
           metafiles for vector characters and other symbols.


           The command for line segment ('l') is awkward at best.


           Greg Ward


           cv(1), meta(3), pexpand(1), primout(3), psort(1)

    RADIANCE 10/23/98 METAFILE(5)


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