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

TABLE LXXXVIII. Character Orientation output.

MSB LSB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

5 16 8 = 0x5208

0 = 0x0000

Y X

0 = 0x0000

5.1.2.4.5 Fill Color element output. Provide the capability to generate and output the Fill Color element using the following format. The Fill Color command is used to support the filled-area primitives. RGB values are each specified using a single byte, and the last byte of the command shall be a null byte.

TABLE LXXXIX. Fill Color output.

MSB LSB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

5 23 3 = 0x52E3

RED GREEN BLUE 0

5.1.2.4.6 Interior Style element output. The CGM implementation for NITFS shall provide the capability to generate and output the Interior Style element using the following format. Filled-area primitives must support the Interior_Style parameter for solid (1), hatch (3) and empty (4).

TABLE XC. Interior Style output.

MSB LSB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

5 22 2 = 0x52C2

INTERIOR_STYLE

5.1.2.4.6.1 Hatch Index output. The CGM implementation for NITFS shall provide the capability to generate and output the Hatch Index element using the following format. The Hatch Index command is used to support the primitive filled-area styles: horizontal (1), vertical (2), positive slope (3), negative slope (4), horizontal/vertical crosshatch (5) and positive/negative slope cross (6).

TABLE XC(A). Hatch Index Output.

MSB				LSB
15	14 13 12	11 10 9 8 7 6 5	4 3 2 1	0
	5	24	2		= 0x5302

HATCH_INDEX

5.1.2.4.7 Edge Visibility element output. The CGM implementation for NITFS shall provide the capability to generate and output the Edge Visibility element using the following format. The edge visibility command (0=off, 1=on) is supported for use in filled-area primitives.

TABLE XCI. Edge Visibility output.

MSB LSB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

5 30 2 = 0x52C2

EDGE_VISIBILITY

5.1.2.4.8 Edge Width element output. The CGM implementation for NITFS shall provide the capability to generate and output the Edge Width element using the following format. Variable edge widths are supported for use in filled-area primitives.