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

5.1.1.5.3  Ellipse element input.  The CGM implementation for NITFS shall provide the capability to input and interpret the Ellipse element using the following format.  The ellipse parameters consist of a list of three pairs of coordinates.  The first pair, CenterX and CenterY, gives the location of the center of the ellipse.  The other two pairs, End1X, End1Y, and End2X, End2Y, specify the end points of the first and second conjugate diameters. The ellipse interior will be as specified by the Interior Style command, and the edge width, type, and color will be as specified in the Edge Width, Edge Type, and Edge Color commands, respectively.

TABLE XLIX.  Ellipse input.

MSB                                                                                                                                                               LSB

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

4                8                                                                 31                                = 0x422C CenterX

CenterY Edn1X End1Y End2X End2Y

5.1.1.5.4  Polyline element input.  The CGM implementation for NITFS shall provide the capability to input and interpret the Polyline element using the following format.  The polyline parameters consist of a list of pairs of coordinates indicating the vertices of a polyline (Vertex1X, Vertex1Y) to (Vertex(N)X, Vertex(N)Y).  The line width, type, and color are specified by the Line Width, Line Type, and Line Color commands, respectively. Polylines are not "clipped" to the image boundary.  Therefore, some coordinates may specify off-image or

off-screen locations, including negative locations.  Note, the parameter list length is given as the total number of bytes for all vertex parameters (4N).

TABLE L.  Polyline short form input.

MSB                                                                                                                                                                          LSB

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

4                1                                                  parameter list length (4N) Vertex1X

Vertex1Y Vertex2X Vertex2Y

Vertex(N)X Vertex(N)Y

TABLE LI.  Polyline long form input.

MSB                                                                                                                                                               LSB

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

4                1                                                                 31                                = 0x403F Parameter list length (4N)

Vertex1X Vertex1Y Vertex2X Vertex2Y

Vertex(N)X Vertex(N)Y

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