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By default, libplot's CGM driver emits version 3 CGM format, conforming to
the WebCGM profile. The output may include the following CGM primitives.
For their semantics, see "The CGM Handbook" (cited below). Many of the
names should be self-explanatory.
By setting the libplot parameter or environment variable CGM_MAX_VERSION to
"2" or "1", you can produce a CGM file whose version is less than 3. This
is often desirable, because many CGM viewers can handle only version 1 CGM
files. If the CGM version is 2 or 1, the primitives below that are not
allowed to appear in version 2 or 1 CGM files will be emulated using
allowed primitives, or simply dropped (if appropriate). The table
indicates which primitives may appear only in version 2 and higher,
and 3 and higher.
CGM Delimiter Elements:
BEGMF
BEGPIC
BEGPICBODY
ENDPIC
ENDMF
CGM Metafile Descriptor Elements:
MFVERSION
MFELEMLIST
MFDESC
VDCTYPE
INTEGERPREC
REALPREC
COLRPREC
COLRVALUEEXT
FONTLIST
CHARSETLIST
CHARCODING
FONTPROP (version 3 or higher)
CGM Picture Descriptor Elements:
SCALEMODE
COLRMODE
LINEWIDTHMODE
EDGEWIDTHMODE
MARKERSIZEMODE
VDCEXT
BACKCOLR
LINEEDGETYPEDEF (version 3 or higher)
CGM Control Elements:
VDCINTEGERPREC
MITRELIMIT (version 3 or higher)
CGM Graphical Primitive Elements:
LINE
MARKER
RESTRTEXT
POLYGON
RECT
CIRCLE
ARCCTR
ELLIPSE
ELLIPARC
ARCCTRREV (version 2 or higher)
POLYBEZIER (version 3 or higher)
CGM Attribute Elements:
LINETYPE
LINEWIDTH
LINECOLR
MARKERTYPE
MARKERSIZE
MARKERCOLR
TEXTFONTINDEX
TEXTPREC
TEXTCOLR
CHARHEIGHT
CHARORI
TEXTALIGN
CHARSETINDEX
ALTCHARSETINDEX
INTSTYLE
FILLCOLR
EDGETYPE
EDGEWIDTH
EDGECOLR
EDGEVIS
LINECAP (version 3 or higher)
LINEJOIN (version 3 or higher)
LINETYPEINITOFFSET (version 3 or higher)
EDGECAP (version 3 or higher)
EDGEJOIN (version 3 or higher)
EDGETYPEINITOFFSET (version 3 or higher)
RESTRTEXTTYPE (version 3 or higher)
----------------------------------------------------------------------
References used when writing the CGM driver include:
The WebCGM profile, available at http://www.w3.org/TR/REC-WebCGM as an
official recommendation of the World Wide Web Consortium.
"The CGM Handbook", L. R. Henderson and A. Mumford (Academic, 1992).
"CGM and CGI", D. B. Arnold and P. R. Bono (Springer-Verlag, 1988).
Sourcecode for cd-1.3, also called CD, cgmdraw 1.3, and CGM Draw 1.3, a
freely available C function library for generating version-1 CGM files.
cd-1.3 was developed at NIST (the U.S. National Institute for Standards
and Technology) by G. Edward Johnson (formerly, lorax@nist.gov).
However, it no longer seems to be available through NIST Web pages.
Sourcecode for RALCGM, a free viewer for version-1 CGM files developed
at Rutherford Appleton Laboratory in the U.K. Available at
ftp://ftp.cc.rl.ac.uk/pub/graphics/ralcgm/unix/ .
http://www.posc.org/Epicentre.2_2/GraphicsMetafile/SeismicExtensions/ .
Contains a GIF image of the section from the CGM specification dealing
with the format of SDR's (structured data records, used in specifying
font properties in version-3 CGM files).
http://www.nist.gov/itl/div897/ctg/cgm_form.htm .
Sample CGM files, forming test suites, distributed by the US NIST
(National Institute of Standards and Technology).
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