MIL-STD-2301A
5.2.2.1.5 Number of Begin Picture elements and Begin Picture Body elements required for input. The CGM implementation for NITFS shall be able to input and interpret one Begin Picture element with only one corresponding Begin Picture Body element.
5.2.2.1.6 End Picture element required for input. The CGM implementation for NITFS shall be able to input and interpret a CGM where an End Picture element occurs for each Begin Picture element.
5.2.2.1.7 VDC Extent element required for input. The CGM implementation for NITFS shall provide the capability to input and interpret a CGM where the VDC extent origin maps to the row and column given in the SLOC field in the National Imagery Transmission Format (NITF) symbol subheader and the VDC extent space maps one-to-one to the source coordinates.
5.2.2.1.8 Edge Width Specification Mode element for input. The CGM implementation for NITFS shall be able to input and interpret a CGM where the Edge Width Specification Mode element occurs before any
filled-area primitive element. The representation of edge widths shall be centered (within plus or minus one pixel)
on the ideal mathematically-defined edge of the area.
5.2.2.1.9 Line Width Specification Mode element for input. The CGM implementation for NITFS shall be able to input and interpret a CGM where the Line Width Specification Mode element occurs before any line primitive element. The representation of line widths shall be centered (within plus or minus one pixel) on the ideal mathematically-defined center of the line.
5.2.2.1.10 Color Selection Mode element required for input. The CGM implementation for NITFS shall be able to input and interpret a CGM where the Color Selection Mode element occurs before any graphics primitive.
5.2.2.1.11 Character Orientation element required for input. The CGM implementation for NITFS shall be able to input and interpret a CGM where the character orientation element occurs before the Text Primitive element to ensure that the text is displayed upright and left to right.
5.2.2.1.12 Font List number required for input. The CGM implementation for NITFS shall be able to input and interpret at least 32 font name entries in the Font List element.
5.2.2.1.13 Font names for input. The CGM implementation for NITFS shall use a system font for any unsupported font name specified in the Font List element. The substituted system fonts shall have similar visual and metric characteristics to the font specified in the metafile.
5.2.2.1.14 Text Font Index required for input. The CGM implementation for NITFS shall be able to input and interpret a Text Font Index element with index n when the Font List element has been interpreted with the number of fonts at least n.
5.2.2.1.15 Edge widths for input. The CGM implementation for NITFS shall be able to substitute default system edge widths for any unsupported edge widths from the Edge Width element.
5.2.2.1.16 Line widths for input. The CGM implementation for NITFS shall be able to substitute default system line widths for any unsupported line widths from the Line Width element.
5.2.2.1.17 Edge types required for input. The CGM implementation for NITFS shall be able to substitute solid edge type for any unsupported edge type from the Edge Type element.
5.2.2.1.18 Line types required for input. The CGM implementation for NITFS shall be able to substitute solid line type for any unsupported line type from the Line Type element.
5.2.2.1.19 Interior styles required for input. The CGM implementation for NITFS shall be able to substitute empty interior style for any unsupported interior style from the Interior Style element.
5.2.2.1.20 Text element requirements for input. The CGM implementation for NITFS shall be able to input and interpret the Text element with text string parameter length at least 254 characters.
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