CGM Conformance

CGM option is implemented based on the ISO/IEC 8632:1999 CGM, W3C WebCGM 2.0 specification.

The below table shows the implemented CGM elements.

The ISO8632 and WebCGM columns show the conformance status of the associated element.

Class-ID Element Condition Comments / Attributes ISO8632 WebCGM
0-0 NOP yes

v1 Y Y
0-1 BEGIN METAFILE yes

When multiple BEGIN METAFILE elements are included, only the first one is effective.

v1 R R
0-2 END METAFILE yes

If the element exists after END METAFILE, it is ignored.

v1 R R
0-3 BEGIN PICTURE yes

With WebCGM, only one from BEGIN PICTURE to END PICTURE can be included in the metafile.

v1 Y R
0-4 BEGIN PICTURE BODY yes

v1 Y R
0-5 END PICTURE yes

v1 Y R
0-6 BEGIN SEGMENT no

v2 Y N
0-7 END SEGMENT no

v2 Y N
0-8 BEGIN FIGURE yes

v2 Y Y
0-9 END FIGURE yes

v2 Y Y
0-13 BEGIN PROTECTION REGION yes

v3 Y Y
0-14 END PROTECTION REGION yes

v3 Y Y
0-15 BEGIN COMPOUND LINE yes

v3 Y Y
0-16 END COMPOUND LINE yes

v3 Y Y
0-17 BEGIN COMPOUND TEXT PATH no

v3 Y Y
0-18 END COMPOUND TEXT PATH no

v3 Y Y
0-19 BEGIN TILE ARRAY partial

cell path direction, line progression direction are ignored.

v3 Y Y
0-20 END TILE ARRAY yes

v3 Y Y
0-21 BEGIN APPLICATION STRUCTURE partial

In WebCGM, the following types are defined. When these types have structural violation or the types are outside the defined one, a warning message will be shown.

  • layer
  • grobject
  • para
  • subpara
  • grnode

The semantic interpretation of the type is not performed. The content is evaluated as is. inheritance flag is ignored and considered statelist.

v4 Y Y
0-22 BEGIN APPLICATION STRUCTURE BODY yes

v4 Y Y
0-23 END APPLICATION STRUCTURE yes

v4 Y Y
1-1 METAFILE VERSION yes

The version information isn't used.

v1 R R
1-2 METAFILE DESCRIPTION yes v1 R R
1-3 VDC TYPE yes

v1 Y Y
1-4 INTEGER PRECISION yes

v1 Y Y
1-5 REAL PRECISION yes

v1 Y Y
1-6 INDEX PRECISION yes

v1 Y Y
1-7 COLOUR PRECISION yes

v1 Y Y
1-8 COLOUR INDEX PRECISION yes

v1 Y Y
1-9 MAXIMUM COLOUR INDEX yes

v1 Y Y
1-10 COLOUR VALUE EXTENT yes

v1 Y Y
1-11 METAFILE ELEMENT LIST partial

Ignored.

v1 Y Y
1-12 METAFILE DEFAULTS REPLACEMENT yes

v1 Y Y
1-13 FONT LIST yes

v1 Y Y
1-14 CHARACTER SET LIST partial

Ignored.

v1 Y Y
1-15 CHARACTER CODING ANNOUNCER partial

Ignored.

v1 Y R
1-16 NAME PRECISION yes

v2 Y N
1-17 MAXIMUM VDC EXTENT partial

Ignored.

v2 Y Y
1-18 SEGMENT PRIORITY EXTENT no

v2 Y N
1-19 COLOUR MODEL partial

Supported only for RGB.

v3 Y Y
1-20 COLOUR CALIBRATION no

v3 Y N
1-21 FONT PROPERTIES partial

Only the attributes listed below are evaluated.

  1. font index
  2. font family
  3. posture
  4. weight
  5. proportionate width
v3 Y Y
1-22 GLYPH MAPPING no

v3 Y N
1-23 SYMBOL LIBRARY LIST no

v3 N N
1-24 PICTURE DIRECTORY no

v4 Y N
2-1 SCALING MODE yes

v1 Y R
2-2 COLOUR SELECTION MODE yes

v1 Y Y
2-3 LINE WIDTH SPECIFICATION MODE yes

v1 Y Y
2-4 MARKER SIZE SPECIFICATION MODE yes

v1 Y Y
2-5 EDGE WIDTH SPECIFICATION MODE yes

v1 Y Y
2-6 VDC EXTENT yes

v1 Y Y
2-7 BACKGROUND COLOUR yes

v1 Y Y
2-8 DEVICE VIEWPORT no

v2 N N
2-9 DEVICE VIEWPORT SPECIFICATION MODE no

v2 N N
2-10 DEVICE VIEWPORT MAPPING no

v2 N N
2-11 LINE REPRESENTATION yes

v2 Y N
2-12 MARKER REPRESENTATION yes

v2 Y N
2-13 TEXT REPRESENTATION yes

v2 Y N
2-14 FILL REPRESENTATION yes

v2 Y N
2-15 EDGE REPRESENTATION yes

v2 Y N
2-16 INTERIOR STYLE SPECIFICATION MODE yes

v3 Y Y
2-17 LINE AND EDGE TYPE DEFINITION yes

v3 Y Y
2-18 HATCH STYLE DEFINITION yes

v3 Y Y
2-19 GEOMETRIC PATTERN DEFINITION no

v3 Y N
2-20 APPLICATION STRUCTURE DIRECTORY no

v4 Y N
3-1 VDC INTEGER PRECISION yes

v1 Y Y
3-2 VDC REAL PRECISION yes

v1 Y Y
3-3 AUXILIARY COLOUR yes

v1 Y Y
3-4 TRANSPARENCY partial

Reflected on hatch and non-solid line.

v1 Y Y
3-5 CLIP RECTANGLE yes

v1 Y Y
3-6 CLIP INDICATOR yes

v1 Y Y
3-7 LINE CLIPPING MODE partial

Supported only for shape.

v2 Y N
3-8 MARKER CLIPPING MODE partial

Supported only for shape.

v2 Y N
3-9 EDGE CLIPPING MODE partial

Supported only for shape.

v2 Y N
3-10 NEW REGION yes

v2 Y Y
3-11 SAVE PRIMITIVE CONTEXT no

v2 Y N
3-12 RESTORE PRIMITIVE CONTEXT no

v2 Y N
3-17 PROTECTION REGION INDICATOR yes

When multiple REGION are made effective, adopts REGION that is newly made effective, without adopting the total of these regions as REGION.

v2 Y Y
3-18 GENERALIZED TEXT PATH MODE no

v3 Y Y
3-19 MITRE LIMIT yes

v3 Y Y
3-20 TRANSPARENT CELL COLOUR partial

Reflected when the compression types are the following:

0.null background
1.null foreground
2.T6
3.T4 1-dimensional
4.T4 2-dimensional
5.bitmap
6.run length
v3 Y Y
4-1 POLYLINE yes

v1 Y Y
4-2 DISJOINT POLYLINE yes

v1 Y Y
4-3 POLYMARKER yes

v1 Y Y
4-4 TEXT yes

v1 Y N
4-5 RESTRICTED TEXT yes

v1 Y Y
4-6 APPEND TEXT yes

v1 Y Y
4-7 POLYGON yes

v1 Y Y
4-8 POLYGON SET yes

v1 Y Y
4-9 CELL ARRAY yes

v1 Y Y
4-10 GENERALIZED DRAWING PRIMITIVE no

v1 N N
4-11 RECTANGLE yes

v1 Y Y
4-12 CIRCLE yes

v1 Y Y
4-13 CIRCULAR ARC 3 POINT yes

v1 Y Y
4-14 CIRCULAR ARC 3 POINT CLOSE yes

v1 Y Y
4-15 CIRCULAR ARC CENTRE yes

v1 Y Y
4-16 CIRCULAR ARC CENTRE CLOSE yes

v1 Y Y
4-17 ELLIPSE yes

v1 Y Y
4-18 ELLIPTICAL ARC yes

v1 Y Y
4-19 ELLIPTICAL ARC CLOSE yes

v1 Y Y
4-20 CIRCULAR ARC CENTRE REVERSED yes

v2 Y Y
4-21 CONNECTING EDGE yes

v2 Y Y
4-22 HYPERBOLIC ARC yes

Approximated curve is drawn.

v3 Y N
4-23 PARABOLIC ARC yes

v3 Y N
4-24 NON-UNIFORM B-SPLINE yes

Drawn by transforming to non-rational cubic Bézier curves.

v3 Y Y
4-25 NON-UNIFORM RATIONAL B-SPLINE yes

Drawn by transforming to non-rational cubic Bézier curves.

v3 Y Y
4-26 POLYBEZIER yes

v3 Y Y
4-27 POLYSYMBOL no

v3 N N
4-28 BITONAL TILE partial

The following compression types are supported.

0.null background
1.null foreground
2.T6
3.T4 1-dimensional
4.T4 2-dimensional
5.bitmap
6.run length
7.baseline jpeg
9.png
v3 Y Y
4-29 TILE partial v3 Y Y
5-1 LINE BUNDLE INDEX yes

v1 Y N
5-2 LINE TYPE yes

LINE TYPE=1 to 14 are supported. LINE TYPE=6, 7, 8, 14 are adopted only with POLY LINE. When LINE TYPE=6, 8, and the length of the arrowhead is less than the length of the segment or the width of the arrowhead is less than the width of a line, an arrowhead isn't drawn. When LINE TYPE=7 and a circular diameter is less than the length of the segment or the width of a line, a circle isn't drawn.

v1 Y Y
5-3 LINE WIDTH yes

v1 Y Y
5-4 LINE COLOUR yes

v1 Y Y
5-5 MARKER BUNDLE INDEX yes

v1 Y N
5-6 MARKER TYPE yes

v1 Y Y
5-7 MARKER SIZE yes

v1 Y Y
5-8 MARKER COLOUR yes

v1 Y Y
5-9 TEXT BUNDLE INDEX yes

v1 Y N
5-10 TEXT FONT INDEX yes

v1 Y Y
5-11 TEXT PRECISION partial

Ignored.

v1 Y Y
5-12 CHARACTER EXPANSION FACTOR yes

v1 Y Y
5-13 CHARACTER SPACING yes

v1 Y Y
5-14 TEXT COLOUR yes

v1 Y Y
5-15 CHARACTER HEIGHT yes

v1 Y Y
5-16 CHARACTER ORIENTATION yes

v1 Y Y
5-17 TEXT PATH yes

v1 Y Y
5-18 TEXT ALIGNMENT yes

v1 Y Y
5-19 CHARACTER SET INDEX partial

Ignored.

v1 Y Y
5-20 ALTERNATE CHARACTER SET INDEX partial

Ignored.

v1 Y Y
5-21 FILL BUNDLE INDEX yes

v1 Y N
5-22 INTERIOR STYLE partial

geometric pattern is not supported.

v1 Y Y
5-23 FILL COLOUR yes

v1 Y Y
5-24 HATCH INDEX yes

v1 Y Y
5-25 PATTERN INDEX yes

v1 Y Y
5-26 EDGE BUNDLE INDEX yes

v1 Y N
5-27 EDGE TYPE yes

v1 Y Y
5-28 EDGE WIDTH yes

v1 Y Y
5-29 EDGE COLOUR yes

v1 Y Y
5-30 EDGE VISIBILITY yes

v1 Y Y
5-31 FILL REFERENCE POINT yes

v1 Y Y
5-32 PATTERN TABLE yes

v1 Y Y
5-33 PATTERN SIZE yes

v1 Y Y
5-34 COLOUR TABLE yes

v1 Y Y
5-35 ASPECT SOURCE FLAGS yes

v1 Y N
5-36 PICK IDENTIFIER no

v2 Y N
5-37 LINE CAP partial

triangle is not supported.

v3 Y Y
5-38 LINE JOIN yes

v3 Y Y
5-39 LINE TYPE CONTINUATION partial

Ignored.

v3 Y Y
5-40 LINE TYPE INITIAL OFFSET yes

v3 Y Y
5-41 TEXT SCORE TYPE no

v3 Y Y
5-42 RESTRICTED TEXT TYPE yes

v3 Y Y
5-43 INTERPOLATED INTERIOR partial

triangular is not supported.

v3 Y Y
5-44 EDGE CAP partial

triangle is not supported.

v3 Y Y
5-45 EDGE JOIN yes

v3 Y Y
5-46 EDGE TYPE CONTINUATION partial

Ignored.

v3 Y Y
5-47 EDGE TYPE INITIAL OFFSET yes

v3 Y Y
5-48 SYMBOL LIBRARY INDEX no

v3 N N
5-49 SYMBOL COLOUR no

v3 N N
5-50 SYMBOL SIZE no

v3 N N
5-51 SYMBOL ORIENTATION no

v3 N N
6-1 ESCAPE partial

The following functions are supported. The other functions of ESCAPE element are ignored.

  1. Transparent Cell Colour
  2. Alpha Transparency
v1 Y Y
7-1 MESSAGE yes

A message with the error level 1 is outputted.

v1 Y N
7-2 APPLICATION DATA no

v1 Y N
8-1 COPY SEGMENT no

v2 Y N
8-2 INHERITANCE FILTER no

v2 Y N
8-3 CLIP INHERITANCE no

v2 Y N
8-4 SEGMENT TRANSFORMATION no

v2 Y N
8-5 SEGMENT HIGHLIGHTING no

v2 Y N
8-6 SEGMENT DISPLAY PRIORITY no

v2 Y N
8-7 SEGMENT PICK PRIORITY no

v2 Y N
9-1 APPLICATION STRUCTURE ATTRIBUTE partial

In WebCGM, the following attributes are defined:

  • region
  • viewcontext
  • linkuri
  • layername
  • layerdesc
  • screentip
  • name
  • content
  • visibility
  • interactivity

These settings are evaluated, but these are not always used. When visibility is off, its APPLICATION STRUCTURE is not shown.

v4 Y Y