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

5.2.2.1.21 Character Height requirements for input. The CGM implementation for NITFS shall be able

to substitute default system text heights for any unsupported character height in the Character Height element. The implementation shall at least support character heights within the range of 6 through 72, although not all values within the range need to be supported for each font. When receiving an unsupported character height, the substituted height shall be the next lowest supported value for the font.

5.2.2.1.22 Polyline element requirements for input. The CGM implementation for NITFS shall be able to input and interpret the Polyline element with at least 4096 vertices.

5.2.2.1.23 Polygon and Polygon Set element requirements for input. The CGM implementation for

NITFS shall be able to input and interpret the Polygon and Polygon Set element with at least 4096 vertices.

5.2.2.1.24 Input and interpret in sequential order. The CGM implementation for NITFS shall be able to interpret the CGM elements in the sequential order from which they are input from the metafile.

5.2.2.1.25 Input Text element. The CGM implementation for NITFS shall be able to input and interpret the Text element using the following attributes.

a. Text Color

b. Character Height c. Text Font Index

d. Character Orientation

5.2.2.1.26 Input Polygon and Polygon Set element. The CGM implementation for NITFS shall be able to input and interpret the Polygon element using the following attributes.

a. Fill Color

b. Interior Style

c. Edge Visibility d. Edge Width

e. Edge Type f. Edge Color

5.2.2.1.27 Input Ellipse element. The CGM implementation for NITFS shall be able to input and interpret the Ellipse element using the following attributes.

a. Fill Color

b. Interior Style

c. Edge Visibility d. Edge Width

e. Edge Type f. Edge Color

5.2.2.1.28 Input Polyline element. The CGM implementation for NITFS shall be able to input and interpret the Polyline element using the following attributes.