File Formats

Binary CGM files as defined in ISO/IEC 8632-3 are supported. Clear text encoding is not supported.

CGM Commands

The following is a list of CGM commands and their level of support in jcgm.

Legend for the Status column:

O: supported X: unsupported ~: partially supported, see remarks

Delimiter Elements: Class 0

Class	Element Code	Element Name	Status	Remarks
0	0	no-op	O
0	1	BEGIN METAFILE	O
0	2	END METAFILE	O
0	3	BEGIN PICTURE	O
0	4	BEGIN PICTURE BODY	O
0	5	END PICTURE	O
0	6	BEGIN SEGMENT	X
0	7	END SEGMENT	X
0	8	BEGIN FIGURE	X
0	9	END FIGURE	X
0	13	BEGIN PROTECTION REGION	X
0	14	END PROTECTION REGION	X
0	15	BEGIN COMPOUND LINE	X
0	16	END COMPOUND LINE	X
0	17	BEGIN COMPOUND TEXT PATH	X
0	18	END COMPOUND TEXT PATH	X
0	19	BEGIN TILE ARRAY	O
0	20	END TILE ARRAY	O
0	21	BEGIN APPLICATION STRUCTURE	X
0	22	BEGIN APPLICATION STRUCTURE BODY	X
0	23	END APPLICATION STRUCTURE	X

Metafile Descriptor Elements: Class 1

Class	Element Code	Element Name	Status	Remarks
1	1	METAFILE VERSION	O
1	2	METAFILE DESCRIPTION	O
1	3	VDC TYPE	O
1	4	INTEGER PRECISION	O
1	5	REAL PRECISION	O
1	6	INDEX PRECISION	O
1	7	COLOUR PRECISION	O
1	8	COLOUR INDEX PRECISION	O
1	9	MAXIMUM COLOUR INDEX	O
1	10	COLOUR VALUE EXTENT	O
1	11	METAFILE ELEMENT LIST	O	It is not checked whether all elements required are really implemented.
1	12	METAFILE DEFAULTS REPLACEMENT	O
1	13	FONT LIST	O
1	14	CHARACTER SET LIST	X
1	15	CHARACTER CODING ANNOUNCER	X
1	16	NAME PRECISION	O
1	17	MAXIMUM VDC EXTENT	X
1	18	SEGMENT PRIORITY EXTENT	X
1	19	COLOUR MODEL	O
1	20	COLOUR CALIBRATION	X
1	21	FONT PROPERTIES	X
1	22	GLYPH MAPPING	X
1	23	SYMBOL LIBRARY LIST	X
1	24	PICTURE DIRECTORY	X

Picture Descriptor Elements: Class 2

Class	Element Code	Element Name	Status	Remarks
2	1	SCALING MODE	O
2	2	COLOUR SELECTION MODE	O
2	3	LINE WIDTH SPECIFICATION MODE	O
2	4	MARKER SIZE SPECIFICATION MODE	O
2	5	EDGE WIDTH SPECIFICATION MODE	O
2	6	VDC EXTENT	O
2	7	BACKGROUND COLOUR	O
2	8	DEVICE VIEWPORT	X
2	9	DEVICE VIEWPORT SPECIFICATION MODE	O
2	10	DEVICE VIEWPORT MAPPING	X
2	11	LINE REPRESENTATION	X
2	12	MARKER REPRESENTATION	X
2	13	TEXT REPRESENTATION	X
2	14	FILL REPRESENTATION	X
2	15	EDGE REPRESENTATION	X
2	16	INTERIOR STYLE SPECIFICATION MODE	X
2	17	LINE AND EDGE TYPE DEFINITION	O
2	18	HATCH STYLE DEFINITION	X
2	19	GEOMETRIC PATTERN DEFINITION	O
2	20	APPLICATION STRUCTURE DIRECTORY	X

Control Elements: Class 3

Class	Element Code	Element Name	Status	Remarks
3	1	VDC INTEGER PRECISION	O
3	2	VDC REAL PRECISION	O
3	3	AUXILIARY COLOUR	X
3	4	TRANSPARENCY	X
3	5	CLIP RECTANGLE	O
3	6	CLIP INDICATOR	O
3	7	LINE CLIPPING MODE	X
3	8	MARKER CLIPPING MODE	X
3	9	EDGE CLIPPING MODE	X
3	10	NEW REGION	X
3	11	SAVE PRIMITIVE CONTEXT	X
3	12	RESTORE PRIMITIVE CONTEXT	X
3	17	PROTECTION REGION INDICATOR	X
3	18	GENERALIZED TEXT PATH MODE	X
3	19	MITRE LIMIT	X
3	20	TRANSPARENT CELL COLOUR	X

Graphical Primitive Elements: Class 4

Class	Element Code	Element Name	Status	Remarks
4	1	POLYLINE	O
4	2	DISJOINT POLYLINE	O
4	3	POLYMARKER	O
4	4	TEXT	O
4	5	RESTRICTED TEXT	O
4	6	APPEND TEXT	O
4	7	POLYGON	O
4	8	POLYGON SET	O
4	9	CELL ARRAY	~	Only cell arrays with orthogonal axis are supported
4	10	GENERALIZED DRAWING PRIMITIVE	X
4	11	RECTANGLE	O
4	12	CIRCLE	O
4	13	CIRCULAR ARC 3 POINT	O
4	14	CIRCULAR ARC 3 POINT CLOSE	O
4	15	CIRCULAR ARC CENTRE	O
4	16	CIRCULAR ARC CENTRE CLOSE	O
4	17	ELLIPSE	O
4	18	ELLIPTICAL ARC	O
4	19	ELLIPTICAL ARC CLOSE	O
4	20	CIRCULAR ARC CENTRE REVERSED	X
4	21	CONNECTING EDGE	X
4	22	HYPERBOLIC ARC	X
4	23	PARABOLIC ARC	X
4	24	NON-UNIFORM B-SPLINE	X
4	25	NON-UNIFORM RATIONAL B-SPLINE	X
4	26	POLYBEZIER	O
4	27	POLYSYMBOL	X
4	28	BITONAL TILE	~	Only cell path direction 0 and line progression 90 supported; only compression type JPEG, PNG and T6 supported. For T6, an ImageIO plug-in able to handle TIFF images with T6 compression is required on the classpath.
4	29	TILE	~	See Bitonal Tile

Attribute Elements: Class 5

Class	Element Code	Element Name	Status	Remarks
5	1	LINE BUNDLE INDEX	X
5	2	LINE TYPE	O
5	3	LINE WIDTH	~	Only for LINE WIDTH SPECIFICATION MODE ABSOLUTE and SCALED
5	4	LINE COLOUR	O
5	5	MARKER BUNDLE INDEX	X
5	6	MARKER TYPE	O
5	7	MARKER SIZE	~	Only for MARKER SIZE SPECIFICATION MODE ABSOLUTE and SCALED
5	8	MARKER COLOUR	O
5	9	TEXT BUNDLE INDEX	X
5	10	TEXT FONT INDEX	X
5	11	TEXT PRECISION	X
5	12	CHARACTER EXPANSION FACTOR	X
5	13	CHARACTER SPACING	X
5	14	TEXT COLOUR	O
5	15	CHARACTER HEIGHT	O
5	16	CHARACTER ORIENTATION	O
5	17	TEXT PATH	X
5	18	TEXT ALIGNMENT	X
5	19	CHARACTER SET INDEX	X
5	20	ALTERNATE CHARACTER SET INDEX	X
5	21	FILL BUNDLE INDEX	X
5	22	INTERIOR STYLE	~	Only HOLLOW, SOLID, HATCH, EMPTY
5	23	FILL COLOUR	O
5	24	HATCH INDEX	O
5	25	PATTERN INDEX	X
5	26	EDGE BUNDLE INDEX	X
5	27	EDGE TYPE	O
5	28	EDGE WIDTH	~	Only for EDGE WIDTH SPECIFICATION MODE ABSOLUTE and SCALED
5	29	EDGE COLOUR	O
5	30	EDGE VISIBILITY	O
5	31	FILL REFERENCE POINT	X
5	32	PATTERN TABLE	X
5	33	PATTERN SIZE	X
5	34	COLOUR TABLE	O
5	35	ASPECT SOURCE FLAG	X
5	36	PICK IDENTIFIER	X
5	37	LINE CAP	~	Only BUTT and ROUND
5	38	LINE JOIN	O
5	39	LINE TYPE CONTINUATION	X
5	40	LINE TYPE INITIAL OFFSET	X
5	41	TEXT SCORE TYPE	X
5	42	RESTRICTED TEXT TYPE	O
5	43	INTERPOLATED INTERIOR	X
5	44	EDGE CAP	~	Only BUTT and ROUND
5	45	EDGE JOIN	O
5	46	EDGE TYPE CONTINUATION	X
5	47	EDGE TYPE INITIAL OFFSET	X
5	48	SYMBOL LIBRARY INDEX	X
5	49	SYMBOL COLOUR	X
5	50	SYMBOL SIZE	X
5	51	SYMBOL ORIENTATION	X

Escape Elements: Class 6

Class	Element Code	Element Name	Status	Remarks
6	1	ESCAPE	X

External Elements: Class 7

Class	Element Code	Element Name	Status	Remarks
7	1	MESSAGE	O
7	2	APPLICATION DATA	O

Segment Elements: Class 8

Class	Element Code	Element Name	Status	Remarks
8	1	COPY SEGMENT	X
8	2	INHERITANCE FILTER	X
8	3	CLIP INHERITANCE	X
8	4	SEGMENT TRANSFORMATION	X
8	5	SEGMENT HIGHLIGHTING	X
8	6	SEGMENT DISPLAY PRIORITY	X
8	7	SEGMENT PICK PRIORITY	X

Application Structure Descriptor Elements: Class 9

Class	Element Code	Element Name	Status	Remarks
9	1	APPLICATION STRUCTURE ATTRIBUTE	X