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

5.2.1.1.2  Begin Picture element position for input.  The CGM implementation for NITFS shall interpret the Begin Picture element after all Metafile Descriptor elements in the metafile.

5.2.1.1.3  Begin Picture Body element position for input.  The CGM implementation for NITFS shall interpret the Begin Picture Body element after each Begin Picture element and its associated Picture Descriptor elements.

5.2.1.1.4  End Picture element position for input.  The CGM implementation for NITFS shall interpret the End Picture element after any Begin Picture Body element and its associated Attribute and Graphical Primitive elements.

5.2.1.1.5  End Metafile element position for input.  The CGM implementation for NITFS shall interpret the End Metafile element as the last element in the metafile.

5.2.1.1.6  Metafile Descriptor elements position for input.  The CGM implementation for NITFS shall interpret all Metafile Descriptor elements after the Begin Metafile element and before any Begin Picture elements. The Metafile Version element, the Metafile Element List element and the Metafile Description element shall be the first three metafile descriptor elements in that order.

5.2.1.1.7  Picture Descriptor elements position for input.  The CGM implementation for NITFS shall interpret all Picture Descriptor elements after the Begin Picture element and before the Begin Picture Body element.

5.2.1.1.8  Attribute elements position for input.  The CGM implementation for NITFS shall interpret any Attribute Element after the Begin Picture Body element and before the Graphical Primitive element to which it applies.

5.2.1.1.9  Graphical Primitive elements position for input.  The CGM implementation for NITFS shall interpret any Graphical Primitive elements after the Begin Picture Body element and any associated Attribute elements for that Graphical Primitive element and before the End Picture element.

5.2.1.2  CGM element position output requirements.

5.2.1.2.1  Begin Metafile element position for output.  The CGM implementation for NITFS shall generate the Begin Metafile element as the first command in the metafile.

5.2.1.2.2  Begin Picture element position for output.  The CGM implementation for NITFS shall generate the Begin Picture element after all Metafile Descriptor elements in the metafile.

5.2.1.2.3  Begin Picture Body element position for output.  The CGM implementation for NITFS shall generate the Begin Picture Body element after each Begin Picture element and its associated Picture Descriptor elements.

5.2.1.2.4  End Picture element position for output.  The CGM implementation for NITFS shall generate the End Picture element after any Begin Picture Body element and its associated Attribute and Graphical Primitive elements.

5.2.1.2.5  End Metafile element position for output.  The CGM implementation for NITFS shall generate the End Metafile element as the last element in the metafile.

5.2.1.2.6  Metafile Descriptor elements position for output.  The CGM implementation for NITFS shall generate all Metafile Descriptor elements after the Begin Metafile element and before any Begin Picture elements. The Metafile Version element, the Metafile Element List element, and the Metafile Description element shall be the first three metafile descriptor elements in that order.

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