CGM order processing (CGLOAD call)

GDDM V3R2 Base Application Programming Reference

CGM order processing (CGLOAD call)

GDDM V3R2 Base Application Programming Reference
SC33-0868-02

This section defines how CGM orders are dealt with during the CGM to GDF conversion process. Orders described as "Ignored" are skipped in the input datastream and the next order is dealt with. Orders described as "Equivalent" are converted to equivalent GDF orders and/or affect the generation of subsequent GDF orders.


Table 36. CGM order processing
CGM code and order name	Comments
CGM Class 0 orders: Delimiter elements
0 No-op	Ignored.
1 Begin metafile	Text returned as first part of CGLOAD descriptor1 parameter
2 End metafile	Terminates picture definition
3 Begin Picture	Text returned as CGLOAD descriptor2 parameter
4 Begin Picture Body	Causes GDDM picture to be started and first segment opened
5 End Picture
6 Begin Segment 7 End Segment 8 Begin Figure 9 End Figure 13 Begin Protection Region 14 End Protection Region 15 Begin Compound Line 16 End Compound Line 17 Begin Compound Text Path 18 End Compound Text Path 19 Begin Tile Array 20 End Tile Array	CGM Version 2 and 3 elements. Ignored.
CGM Class 1 orders: Metafile Descriptor elements
1 Metafile Version	Value checked (only Version 1, 2, or 3 CGM permitted, but all Version 2 and 3 elements are ignored).
2 Metafile Description	Text returned as second part of CGLOAD descriptor1 parameter.
3 VDC Type	Equivalent.
4 Integer Precision	Equivalent.
5 Real Precision	Equivalent.
6 Index Precision	Equivalent.
7 Color Precision	Equivalent.
8 Color Index Precision	Equivalent.
9 Maximum Color Index	Equivalent.
10 Color Value Extent	Equivalent.
11 Metafile Element List	Ignored.
12 Metafile Defaults Replacement (metafile elements)	Equivalent.
13 Font List	Equivalent. Up to 32 font names of up to 32 characters each.
14 Character Set List	Ignored.
15 Character Coding Announcer	Ignored.
16 Name Precision 17 Maximum VDC Extent 18 Segment Priority Extent 19 Color Model 20 Color Calibration 21 Font Properties 22 Glyph Mapping 23 Symbol Library List	CGM Version 2 and 3 elements. Ignored.
CGM Class 2 orders: Picture Descriptor elements
1 Scaling Mode	Equivalent.
2 Color Selection Mode	Equivalent. See "Color Index" in topic 13.6.2 for more details.
3 Line Width Specification Mode	Equivalent. GDDM accepts only Absolute and Scaled modes. Other modes are rejected as errors.
4 Marker Size Specification Mode	Equivalent. GDDM accepts only Absolute and Scaled modes. Other modes are rejected as errors.
5 Edge Width Specification Mode	Equivalent. GDDM accepts only Absolute and Scaled modes. Other modes are rejected as errors.
6 VDC Extent	Equivalent.
7 Background Color	Equivalent.
8 Device Viewport 9 Device Viewport Spec. Mode 10 Device Viewport Mapping 11 Line Representation 12 Marker Representation 13 Text Representation 14 Fill Representation 15 Edge Representation 16 Interior Line Spec. Mode 17 Line and Edge Type Definition 18 Hatch Style Definition 19 Geometric Pattern Definition	CGM Version 2 and 3 elements. Ignored.
CGM Class 3 orders: Control elements
1 VDC Integer Precision	Equivalent.
2 VDC Real Precision	Equivalent.
3 Auxiliary Color	Ignored.
4 Transparency	Equivalent.
5 Clip Rectangle	Equivalent.
6 Clip Indicator	Equivalent.
7 Line Clipping Mode 8 Marker Clipping Mode 9 Edge Clipping Mode 10 New Region 11 Save Primitive Context 12 Restore Primitive Context 17 Protection Region Indicator 18 Generalized Text Path Mode 19 Mitre Limit 20 Transparent Cell Color	CGM Version 2 and 3 elements. Ignored.
CGM Class 4 orders: Graphical Primitive elements
1 Polyline	Equivalent.
2 Disjoint Polyline	Equivalent.
3 Polymarker	Equivalent.
4 Text	Equivalent.
5 Restricted Text	Equivalent, using basic restriction and (if appended) using the final text attributes for the complete text string
6 Append Text	Equivalent.
7 Polygon	Equivalent.
8 Polygon Set	Equivalent.
9 Cell Array	Ignored.
10 Generalized Drawing Primitive	Ignored.
11 Rectangle	Equivalent.
12 Circle	Equivalent.
13 Circular Arc 3-point	Equivalent.
14 Circular Arc 3-point Close	Equivalent.
15 Circular Arc Center	Equivalent.
16 Circular Arc Center Close	Equivalent.
17 Ellipse	Equivalent.
18 Elliptical Arc	Equivalent.
19 Elliptical Arc Close	Equivalent.
20 Circular Arc Center Reversed 21 Connecting Edge 22 Hyperbolic Arc 23 Parabolic Arc 24 Non-Uniform B-Spline 25 Non-Uniform Rational B-Spline 26 Polybezier 27 Bitonal Tile 28 Tile 29 Polysymbol	CGM Version 2 and 3 elements. Ignored.
CGM Class 5 orders: Attribute elements
1 Line Bundle Index	Implemented as per CALS defaults in Table XI of the MIL-D-28003A specification.
2 Line Type	Equivalent.
3 Line Width	Equivalent.
4 Line Color	Equivalent.
5 Marker Bundle Index	Implemented as per CALS defaults in Table XI of the MIL-D-28003A specification.
6 Marker Type	Equivalent.
7 Marker Size	Equivalent.
8 Marker Color	Equivalent.
9 Text Bundle Index	Implemented as per CALS defaults in Table XI of the MIL-D-28003A specification.
10 Text Font Index	Equivalent.
11 Text Precision	Ignored.
12 Character Expansion Factor	Equivalent.
13 Character Spacing	Equivalent.
14 Text Color	Equivalent.
15 Character Height	Equivalent.
16 Character Orientation	Equivalent.
17 Text Path	Equivalent.
18 Text Alignment	Equivalent (except for "continuous text alignment," which is ignored.)
19 Character Set Index 20 Alternate Character Set Index	Ignored.
21 Fill Bundle Index	Implemented as per CALS defaults in Table XI of the MIL-D-28003A specification.
22 Interior Style	Equivalent (except for "geometric pattern" and "interpolated", which are treated as "solid").
23 Fill Color	Equivalent.
24 Hatch Index	Equivalent. Maps to GDDM patterns
25 Pattern Index	Equivalent.
26 Edge Bundle Index	Implemented as per CALS defaults in Table XI of the MIL-D-28003A specification.
27 Edge Type	Equivalent.
28 Edge Width	Equivalent.
29 Edge Color	Equivalent.
30 Edge Visibility	Equivalent.
31 Fill Reference Point	Ignored.
32 Pattern Table	Ignored.
33 Pattern Size	Ignored.
34 Color Table	Order converted under certain conditions. See "Color Index" in topic 13.6.2 for more details.
35 Aspect Source Flags	Ignored.
36 Pick Identifier 37 Line Cap 38 Line Join 39 Line Type Continuation 40 Line Type Initial Offset 41 Text Score Type 42 Restricted Text Type 43 Interpolated Interior 44 Edge Cap 45 Edge Join 46 Edge Type Continuation 47 Edge Type Initial Offset 48 Symbol Library Index 49 Symbol Color 50 Symbol Size 51 Symbol Orientation	CGM Version 2 and 3 elements. Ignored.
CGM Class 6 orders: Escape element
1 Escape	Ignored.
CGM Class 7 orders: External elements
1 Message	Ignored.
2 Application Data	Ignored.
CGM Class 8 orders: Segment elements
1 Copy Segment 2 Inheritance Filter 3 Clip Inheritance 4 Segment Transformation 5 Segment Highlighting 6 Segment Display Priority 7 Segment Pick Priority	CGM Version 2 and 3 elements. Ignored.

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