MIL-STD-2301 Computer Graphics Metafile Cgm Implementation Standard For The National Imagery Transmission Format StandardThis standard establishes the requirements necessary to implement Computer Graphics Metafiles CGM used for the representation of symbol graphics in the National Imagery Transmission Format Standard NITFS.

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MIL-STD-2301A CONTENTS

TABLE                                                                                                                                                                    PAGE

1.                          SCOPE....................................................................................................................................... 1

1.1                        Scope.......................................................................................................................................... 1

1.2                        Purpose....................................................................................................................................... 1

1.3                        Applicability............................................................................................................................... 1

2.                          APPLICABLE DOCUMENTS ................................................................................................... 1

2.1                        General....................................................................................................................................... 1

2.2                        Government documents .............................................................................................................. 1

2.2.1                     Specifications, standards, and handbooks.................................................................................... 1

2.2.2                     Other Government documents, drawings, and publications ......................................................... 2

2.3                        Non-Government publications .................................................................................................... 2

2.4                        Order of precedence.................................................................................................................... 2

3.                          DEFINITIONS ........................................................................................................................... 2

3.1                        Acronyms used in this standard .................................................................................................. 2

3.2                        Character.................................................................................................................................... 3

3.3                        Commands ................................................................................................................................. 3

3.4                        Computer Graphics Metafile (CGM)........................................................................................... 3

3.5                        Elements..................................................................................................................................... 3

3.6                        Integer parameters ...................................................................................................................... 4

3.7                        Virtual Device Coordinates (VDC) space.................................................................................... 4

4.                          GENERAL REQIREMENTS...................................................................................................... 4

4.1                        CGM commands......................................................................................................................... 4

4.2                        CGM binary encoding ................................................................................................................ 5

4.3                        CGM element flow ..................................................................................................................... 6

5.                          DETAILED REQUIREMENTS.................................................................................................. 7

5.1                        Interface requirements ................................................................................................................ 7

5.1.1                     CGM interface input requirements.............................................................................................. 7

5.1.1.1                  Delimiter elements...................................................................................................................... 7

5.1.1.1.1               Begin Metafile element input...................................................................................................... 7

5.1.1.1.2               Begin Picture element input........................................................................................................ 8

5.1.1.1.3               Begin Picture Body element input............................................................................................... 8

5.1.1.1.4               End Picture element input........................................................................................................... 9

5.1.1.1.5               End Metafile element input......................................................................................................... 9

5.1.1.2                  Metafile Descriptor elements ...................................................................................................... 9

5.1.1.2.1               Metafile Version element input................................................................................................... 9

5.1.1.2.2               Metafile Description element input ............................................................................................. 9

5.1.1.2.3               Metafile Element List element input ......................................................................................... 10

5.1.1.2.4               Font List element input............................................................................................................. 10

5.1.1.3                  Picture Descriptor elements ...................................................................................................... 11

5.1.1.3.1               Color Selection Mode element input ......................................................................................... 11

5.1.1.3.2               Edge Width Specification Mode element input.......................................................................... 12

5.1.1.3.3               Line Width Specification Mode element input .......................................................................... 12

5.1.1.3.4               VDC Extent element input........................................................................................................ 12

5.1.1.4                  Attribute elements .................................................................................................................... 14

5.1.1.4.1               Text Color element input .......................................................................................................... 14

5.1.1.4.2               Character Height element input ................................................................................................ 14

5.1.1.4.3               Text Font Index element input .................................................................................................. 14

5.1.1.4.4               Character Orientation element input ......................................................................................... 14

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