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Recommendation T.418
OPEN DOCUMENT ARCHITECTURE (ODA) AND INTERCHANGE FORMAT -
GEOMETRIC GRAPHICS CONTENT ARCHITECTURE 1)
CONTENT
1 Scope
2 Normative references
3 Definitions, symbols, abbreviations and conventions
3.1 Definitions
3.2 Symbols, abbreviations and conventions
4 General principles
4.1 Content architecture classes
4.2 Content
4.3 Presentation attributes
4.4 Coding of content information
4.5 Layout and imaging of the content
5 Positioning
5.1 Introduction
5.2 Measurement units and directions
5.3 The relationship between the region of interest and the basic layout object
6 Definition of geometric graphics presentation attributes
6.1 Shared presentation attributes
6.2 Layout presentation attributes
6.3 Logical presentation attributes
6.4 Content architecture class attributes
6.5 Interaction with document architecture attributes
7 Geometric graphics content portions attributes
7.1 Common coding attributes
7.2 Content information
7.3 Other coding attributes
8 Formal definitions of geometric graphics content architecture dependent data types
8.1 Introduction
Fascicle VII.6 - Rec. T.418 1
8.2 Representation of geometric graphics presentation attributes
8.3 Representation of coding attributes
8.4 Representation of non-basic features and non-standard defaults
9 Content layout process
9.1 Introduction
9.2 Content layout process for formatted processable content architecture class
10 Content imaging process
10.1 Introduction
10.2 Content imaging process for formatted processable form content architecture class
11 Definition of geometric graphics content architecture classes
2 Fascicle VII.6 - Rec. T.418
Annex A- Summary of ASN.1 object identifiers
Annex B- Recommendation for the development of geometric graphics content architecture levels in document application
profiles
Annex C- Basic differences between character primitives in the geometric graphics and the content of a basic component
structured according to the character content architectures defined in Recommendation T.416
1 Scope
1.1 The purpose of the T.410-Series of Recommendations is to facilitate the interchange of documents.
In the context of the T.410-Series, documents are considered to be items such as memoranda, letters, invoices,
forms and reports, which may include pictures and tabular material. The content elements used within the documents may
include graphic characters, geometric graphics elements and raster graphics elements, all potentially within one document.
Note - The T.410-Series is designed to allow for extensions, including typographical features, colour, spreadsheets
and additional types of content such as sound.
1.2 The T.410-Series applies to the interchange of documents by means of data communication or the exchange of
storage media.
The T.410-Series provides for the interchange of documents for either or both of the following purposes:
- to allow presentation as intended by the originator;
- to allow processing such as editing and reformatting.
The composition of a document in interchange can take several forms:
- formatted form, allowing presentation of the document;
- processable form, allowing processing of the document;
- formatted processable form, allowing both presentation and processing.
The T.410-Series also provides for the interchange of ODA information structures used for the processing of
interchanged documents.
Furthermore, the T.410-Series allows for the interchange of documents containing one or more different types of
content such as character text, images, graphics and sound.
1.3 This Recommendation
a) defines a geometric graphics content architecture that can be used in conjunction with the document
architecture defined in the Recommendation T.412;
b) defines an interface which allows the use of content structured according to ISO 8632 within documents
structured according to the Recommendation T.412;
c) defines those aspects of positioning and imaging applicable to the presentation of this geometric graphics
content architecture in a basic layout object;
d) defines the presentation attributes applicable to this geometric graphics content architecture;
e) describes a content layout process, which together with the document layout process described in the
Recommendation T.412, describes the layout of geometric graphics content in basic layout and determines
the dimensions of these basic layout objects.
Fascicle VII.6 - Rec. T.418 3
2 Normative references
The following Recommendations and International Standards contain provision which, through reference in the text,
constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All standards are
subject to revision, and parties to agreements based on this Recommendation are encouraged to investigate the possibility of
applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid
International Standards.
- Rec. T.50 (1984), International Alphabet No. 5.
- Rec. X.208 (1988), Specification of abstract syntax notation one (ASN.1).
- ISO 8632-1: 1987, Information processing systems - Computer graphics - Metafile for the storage and
transfer of picture description information - Part 1: Functional specification.
- ISO 8632-3: 1987, Information processing systems - Computer graphics - Metafile for the storage and
transfer of picture description information - Part 3: Binary encoding.
3 Definitions, symbols, abbreviations and conventions
3.1 Definitions
For the purpose of this Recommendation, the definitions given in Recommendation T.411 apply. In addition, the
definitions given in ISO 8632 apply to this Recommendation.
3.2 Symbols, abbreviations and conventions
3.2.1 CGM
This term is used to reference the Computer Graphics Metafile defined in ISO 8632. It is used as a qualifier for
terms defined in ISO 8632 (for example, CGM elements).
3.2.2 Individual CGM elements
Throughout this part whenever individual CGM elements are referred to they are written in uppercase; for example,
SCALING MODE.
3.2.3 CGM concepts
Whenever the concepts defined in CGM are referred to they are written in mixed upper and lower case as
appropriate; for example, Scaling Mode or Virtual Device Coordinates.
3.2.4 Width and height
Width is used throughout this Recommendation to express the extent of a 2-dimensional area in the direction given
by the counter-clockwise rotation from the horizontal direction as specified by the geometric graphics presentation attribute
"orientation".
Height is used throughout this Recommendation to express the extent of a 2-dimensional area orthogonal to its
width.
Note - Width or height are mostly used in combination with a reference to an area; for example, width of the
available area.
4 General principles
4.1 Content architecture classes
This Recommendation defines one class of geometric graphics content architectures:
- a formatted processable form, which allows for document content to be processed and also to be presented
as intended by the originator. Formatted processable form content can be associated with any basic
component.
4 Fascicle VII.6 - Rec. T.418
4.2 Content
A content portion that is structured according to a geometric graphics content architecture represents a single
pictorial image. The representation is based on the Computer Graphics Metafile (CGM) defined in ISO 8632 (see 7.2).
The CGM provides a format suitable for the storage, retrieval and interchange of picture description information.
The format consists of an ordered set of elements. These elements are split into groups that:
a) structure the information in the metafile;
b) specify the precision of the values used within the metafile;
c) control the display of the picture;
d) perform basic drawing actions;
e) control the attributes of the basic drawing actions;
f) provide access to non-standard device capabilities.
ISO 8632 defines the form (syntax) and the functional behaviour (semantics) of these elements.
4.3 Presentation attributes
The geometric graphics content architecture defines geometric graphics presentation attributes applicable to basic
layout and basic logical components. The geometric graphics presentation attributes direct the content layout process and
specify the initial conditions at the start of the presentation of the content associated with a basic object.
Only the geometric graphics presentation attributes specifying CGM defaults (see 6.1.1) can be overwritten by
CGM elements in the content of the basic component to which they apply.
4.4 Coding of content information
The ordered set of elements of the content portion is encoded according to the "binary" encoding defined in ISO
8632-3 and constitutes a complete CGM.
The functionality represented by the geometric graphics presentation attributes specifying CGM defaults (see
6.1.1) and CGM element groups is that defined by ISO 8632-1 and ISO 8632-3, except that:
a) the defaulting rules are modified (see 10.2.1);
b) the CGM shall contain only one picture.
4.5 Layout and imaging of the content
The geometric graphics content architecture describes a content layout process which creates a basic layout object
and determines the dimensions of this object into which the content associated with a basic logical object is to be laid out.
It also describes a content imaging process which determines the image of the content.
5 Positioning
5.1 Introduction
This clause describes the general principles concerning the positioning of a part of the VDC Space within basic
Fascicle VII.6 - Rec. T.418 5
layout objects.
This part is known as the region of interest. It is a rectangular region within the VDC Space, and is defined by two
Virtual Device Coordinate pairs termed "first corner" and "second corner".
Note - The VDC Space is used within ISO 8632 for positioning geometric graphics elements, specifying directions,
specifying dimensions etc.
5.2 Measurement units and directions
The positioning of geometric graphics content within a basic layout object is specified with relation to an orthogonal
coordinate system.
6 Fascicle VII.6 - Rec. T.418
The definition of the region of interest specifies the origin and directions of the axes of the coordinate system, with
respect to the basic layout object.
Figure 1/T.418 illustrates that depending on which coordinates of the VDC Space are referenced by "first corner"
and "second corner" the region of interest can affect the orientation of the axes used when imaging the geometric graphics
content.
The measurement units for the x- and y-axis of the coordinate system are determined by the relationship of the
dimensions of the region of interest to the dimensions of the basic layout object.
FIGURE 1/T.418
Mapping of a virtual image defined in the VDC Space to an output
medium (e.g. a softcopy device) using different region
of interest specifications
5.3 The relationship between the region of interest and the basic layout object
When imaging geometric graphics content, the geometric graphics presentation attribute "picture orientation"
determines the relationship of the "first corner" of the region of interest to the corners of the basic layout object (see 7.1.3).
The "first corner" of the region of interest is coincident with the corner of the basic layout object defined by the
geometric graphics presentation attribute "picture orientation" (for example, the bottom left corner if the presentation attribute
"picture orientation" has value '0°', see 6.1.3). The "second corner" of the region of interest is coincident with the diagonally
opposite corner of the basic layout object. It is implied that the x-axis of the VDC Space always maps to the direction parallel
to the width of the basic layout object. Figures 2/T.418 and 3/T.418 illustrate this mapping.
Fascicle VII.6 - Rec. T.418 7
FIGURE 2/T.418
Relationship of region of interest to the
basic layout object (right handed axes)
FIGURE 3/T.418
Relationship of region of interest to the
basic layout object (left handed axes)
6 Definition of geometric graphics presentation attributes
Presentation attributes specify the constraints and initial conditions relating to the layout and imaging of a basic
component. They may be specified for basic layout components, presentation styles and default value lists.
8 Fascicle VII.6 - Rec. T.418
The following categories of presentation attributes are defined:
a) logical presentation attributes which take effect during the content layout process but are ignored during the
content imaging process;
b) layout presentation attributes which take effect during the content imaging process. Their values are either
determined by a content layout process or specified by a process that creates or edits the content;
c) shared presentation attributes which take effect during both the content layout and imaging processes.
The geometric graphics presentation attributes are summarized in Table 1/T.418.
TABLE 1/T.418
Geometric graphics presentation attributes
w
┌─────────────────────────────────────────────┬──────────────────────────────┐
│ Shared attributes │ Layout attributes │
├─────────────────────────────────────────────┼──────────────────────────────┤
│ Geometric graphics encoding announcer │ No layout presentation │
│ Line rendition │ attributes are specified │
│ Marker rendition │ for this content │
│ Text rendition │ architecture │
│ Filled area rendition ├──────────────────────────────┤
│ Edge rendition │ Logical attributes │
│ Colour representation ├──────────────────────────────┤
│ Transparency specification │ Picture dimensions │
│ Transformation specification │ │
│ Region of interest specification │ │
│ Picture orientation │ │
└─────────────────────────────────────────────┴──────────────────────────────┘
For each presentation attribute, a default value is defined. This value is used in
the defaulting rules as defined in the Recommendation T.412.
This section also defines values specific to the geometric graphics content
architecture for the content architecture class attributes. These attributes are defined
in the Recommendation T.412.
6.1 Shared presentation attributes
6.1.1 Attributes specifying CGM defaults
The following presentation attributes provided information used for the construction
and interpretation of the CGM defaults. They provide information used by the layout and
imaging processes.
Note - This Recommendation uses the term "CGM defaults" whenever ISO 8632 uses the
term "metafile defaults". This is intended to indicate the different semantics, in
conformance with 3.2.1, of "defaults" when used in the context of the T.410-Series of
Recommendations (ODA) or ISO 8632 (CGM).
The default values given for the parameters of these presentation attributes have
been derived from the defaults of the corresponding CGM elements as given in ISO 8632-1
and ISO 8632═3.
Note - Defaults for parameters specifying Direct Colour Values are given either as
"foreground" representing the foreground colour, or "background" representing the
background colour. The choice of foreground and background colour is implementation
dependent. For reproduction on paper the background colour will normally be the colour of
the paper, for instance white, and the foreground colour a contrasting colour, for
Fascicle VII.6 - Rec. T.418 9
instance black.
10 Fascicle VII.6 - Rec. T.418
The presentation attribute "geometric graphics encoding announcer" specifies the
encoding of parameters of the remaining CGM defaults attributes and specifies default
values for the corresponding CGM elements.
The values of the CGM defaults attributes applicable to a basic object are
determined by the defaulting rules defined in the Recommendation T.412.
The values of each parameters of a CGM defaults attribute is:
a) the value specified;
b) if not specified, the value defined in the specification of the default values
for the attribute applicable to this parameter.
This Recommendation does not contain definitions of parameters of presentation
attributes specifying CGM defaults which have the same definitions and semantics as CGM
elements or parameters of these CGM elements with corresponding names defined in
ISO 8632-1. This clause and its sub-clauses contain definitions of parameters for which
the definitions differ from the definitions given in ISO 8632-1 and those parameters
which are not defined in ISO 8632-1.
For certain parameters the CGM defines value ranges as being reserved for
registration. The meaning of these values will be defined using the established
procedures of the ISO International Registration Authority for Graphical Items.
The specification of the parameters of the CGM defaults attributes, their
permissible and default values is made in tabular form. Some of these parameters have
values composed of several sub- parameters. They are shown intended beyond the parameters
using a smaller sized font. The sub- parameters may be further substructured. This is
shown by further indentation.
Tables 2/T.418, 3/T.418 and 4/T.418 define the default values for the bundle
representations, the pattern representations and colour representations, respectively.
These tables are used when determining the default state of the imaging process (see
10.2.1).
TABLE 2/T.418
Default bundle representations
w
┌──────────────────────────┬────────────────────────────────────────────────────────
────────────────────────────────────────────┐
│ │ Bundle index
│
│ Representations
├───────────────────┬───────────────────┬───────────────────┬────────────────────┬───────
────────────┤
│ │ 1 │ 2 │ 3 │
4 │ 5 │
├──────────────────────────┼───────────────────┼───────────────────┼───────────────────┼─
───────────────────┼───────────────────┤
│ Line │ │ │ │
│ │
│ │ │ │ │
│ 5 │
│ Line type │ 1 (solid) │ 2 (dash) │ 3 (dot) │
4 (dash-dot) │ (dash-dot-dot) │
│ │ │ │ │
│ │
│ Line Width │ │ │ │
│ │
│ (if scaled) │ 1,0 │ 1,0 │ 1,0 │
1,0 │ 1,0 │
Fascicle VII.6 - Rec. T.418 11
│ │ 0,001 ╧ length of │ 0,001 ╧ length of │ 0,001 ╧ length of │
0,001 ╧ length of │ 0,001 ╧ length of │
│ (if absolute) │ longest side of │ longest side of │ longest side of │
longest side of │ longest side of │
│ │ default VDC │ default VDC │ default VDC │
default VDC │ default VDC │
│ │ Extent │ Extent │ Extent │
Extent │ Extent │
│ │ │ │ │
│ │
│ Line Colour │ │ │ │
│ │
│ (if indexed) │ 1 │ 1 │ 1 │
1 │ 1 │
│ (if direct) │ foreground │ foreground │ foreground │
foreground │ foreground │
├──────────────────────────┼───────────────────┼───────────────────┼───────────────────┼─
───────────────────┼───────────────────┤
│ Marker │ │ │ │
│ │
│ │ │ │ │
│ │
│ Marker type │ 1 (dot) │ 2 (plus) │ 3 (asterisk) │
4 (circle) │ 5 (cross) │
│ │ │ │ │
│ │
│ Marker size │ │ │ │
│ │
│ (if scaled) │ 1,0 │ 1,0 │ 1,0 │
1,0 │ 1,0 │
│ │ 0,01 ╧ length │ 0,01 ╧ length │ 0,01 ╧ length │
0,01 ╧ length │ 0,01 ╧ length │
│ │ of longest side │ of longest side │ of longest side │
of longest side │ of longest side │
│ (if absolute) │ of default VDC │ of default VDC │ of default VDC │
of default VDC │ of default VDC │
│ │ Extent │ Extent │ Extent │
Extent │ Extent │
│ │ │ │ │
│ │
│ Marker colour │ │ │ │
│ │
│ (if indexed) │ 1 │ 1 │ 1 │
1 │ 1 │
│ (if direct) │ foreground │ foreground │ foreground │
foreground │ foreground │
└──────────────────────────┴───────────────────┴───────────────────┴───────────────────┴─
───────────────────┴───────────────────┘
12 Fascicle VII.6 - Rec. T.418
TABLE 2/T.418 (cont.)
w
┌──────────────────────────┬────────────────────────────────────────────────────────
────────────────────────────────────────────┐
│ │ Bundle index
│
│ Representations
├───────────────────┬───────────────────┬───────────────────┬────────────────────┬───────
────────────┤
│ │ 1 │ 2 │ 3 │
4 │ 5 │
├──────────────────────────┼───────────────────┼───────────────────┼───────────────────┼─
───────────────────┼───────────────────┤
│ Text │ │ │ │
│ │
│ │ │ │ │
│ │
│ Font index │ 1 │ 1 │ none defined │
none defined │ none defined │
│ │ │ │ │
│ │
│ Text precision │ string │ character │ none defined │
none defined │ none defined │
│ │ │ │ │
│ │
│ Character │ │ │ │
│ │
│ expansion factor │ 1,0 │ 0,7 │ none defined │
none defined │ none defined │
│ │ │ │ │
│ │
│ Character spacing │ 0,0 │ 0,0 │ none defined │
none defined │ none defined │
│ │ │ │ │
│ │
│ Text colour │ │ │ │
│ │
│ (if indexed) │ 1 │ 1 │ none defined │
none defined │ none defined │
│ (if direct) │ foreground │ foreground │ none defined │
none defined │ none defined │
├──────────────────────────┼───────────────────┼───────────────────┼───────────────────┼─
───────────────────┼───────────────────┤
│ Filled area │ │ │ │
│ │
│ │ │ │ │
│ │
│ Interior style │ hollow │ hatch │ hatch │
hatch │ hatch │
│ │ │ │ │
│ │
│ Fill colour │ │ │ │
│ │
│ (if indexed) │ 1 │ 1 │ 1 │
1 │ 1 │
│ (if direct) │ foreground │ foreground │ foreground │
foreground │ foreground │
│ │ │ │ │
│ │
│ Hatch index │ 1 │ 1 │ 2 │
3 │ 4 │
│ │ (horizontal │ (horizontal │ (vertical equally │
Fascicle VII.6 - Rec. T.418 13
(positive slope │ (negative slope │
│ │ equally spaced │ equally spaced │ spaced parallel │
equally spaced │ equally spaced │
│ │ parallel lines) │ parallel lines) │ lines) │
parallel lines) │ parallel lines) │
│ │ │ │ │
│ │
│ │ │ │ │
│ │
│ Pattern index │ 1 │ 1 │ 1 │
1 │ 1 │
├──────────────────────────┼───────────────────┼───────────────────┼───────────────────┼─
───────────────────┼───────────────────┤
│ Edge │ │ │ │
│ │
│ │ │ │ │
│ 5 │
│ Edge type │ 1 (solid) │ 2 (dash) │ 3 (dot) │
4 (dash-dot) │ (dash-dot-dot) │
│ │ │ │ │
│ │
│ Edge width │ │ │ │
│ │
│ (if scaled) │ 1,0 │ 1,0 │ 1,0 │
1,0 │ 1,0 │
│ │ 0,001 ╧ length of │ 0,001 ╧ length of │ 0,001 ╧ length of │
0,001 ╧ length of │ 0,001 ╧ length of │
│ (if absolute) │ longest side of │ longest side of │ longest side of │
longest side of │ longest side of │
│ │ default VDC │ default VDC │ default VDC │
default VDC │ default VDC │
│ │ Extent │ Extent │ Extent │
Extent │ Extent │
│ │ │ │ │
│ │
│ Edge colour │ │ │ │
│ │
│ (if indexed) │ 1 │ 1 │ 1 │
1 │ 1 │
│ (if direct) │ foreground │ foreground │ foreground │
foreground │ foreground │
└──────────────────────────┴───────────────────┴───────────────────┴───────────────────┴─
───────────────────┴───────────────────┘
14 Fascicle VII.6 - Rec. T.418
TABLE 3/T.418
Default pattern representations
w
┌────────────────────────────────────────────────┬────────────────────────────
┐
│ │ Pattern table
index │
│ Pattern table entry
├────────────────────────────┤
│ │ 1
│
├────────────────────────────────────────────────┼────────────────────────────
┤
│ NX │
│
│ (number of columns in pattern array) │ 1
│
│ │
│
│ NY │
│
│ (number of rows in pattern array) │ 1
│
│ │
│
│ Local colour precision │
│
│ │ 0
│
│ Colour │
│
│ Index array │
│
│ (if indexed) │ {1}
│
│ │
│
│ Value array │
│
│ (if direct) │
{foreground} │
└────────────────────────────────────────────────┴────────────────────────────
┘
TABLE 4/T.418
Default colour representations
w
┌────────────────────────────────────────────────┬────────────────────────────
────────┐
│ │ Colour table
index │
│ Colour table entry
├──────────────────┬─────────────────┤
│ │ 0 │
1 │
├────────────────────────────────────────────────┼──────────────────┼─────────
────────┤
│ Direct colour value │ background │
foreground │
└────────────────────────────────────────────────┴──────────────────┴─────────
────────┘
Fascicle VII.6 - Rec. T.418 15
6.1.1.1 Geometric graphics encoding announcer
w
┌────────────────────────┬─────────────────────────────────┬─────────────────────────────┐
│ Parameter │ Permissible values │
Default │
├────────────────────────┼─────────────────────────────────┼──────────────────
───────────┤
│ VDC type │ integer, real │
integer │
│ │ │
│
│ Integer precision │ 8, 16, 24, 32 │ 16
│
│ │ │
│
│ Real precision │(floating point format, 9, 23) │
│
│ │(floating point format, 12, 52) │
│
│ │(fixed point format, 16, 16) │(fixed point
format, 16,16) │
│ │(fixed point format, 32, 32) │
│
│ │ │
│
│ Index precision │ 8, 16, 24, 32 │ 16
│
│ │ │
│
│ Colour precision │ 8, 16, 24, 32 │ 8
│
│ │ │
│
│ Colour index │ │
│
│ precision │ 8, 16, 24, 32 │ 8
│
│ │ │
│
│ Maximum Colour │ │
│
│ index │ any integer > 0 │ 63
│
│ │ │
│
│ Colour value extent │any pair of direct colour values │((0,0,0),
(255,255,255)) │
│ │ │
│
│ Colour selection mode │indexed - direct │ indexed
│
│ │ │
│
│ VDC integer precision │ 16, 24, 32 │ 16
│
│ │ │
│
│ │(floating point format, 9, 23) │
│
│ VDC real precision │(floating point format, 12, 52) │(fixed point
format 16,16) │
│ │(fixed point format, 16, 16) │
│
16 Fascicle VII.6 - Rec. T.418
│ │(fixed point format, 16, 16) │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
───────────┘
Fascicle VII.6 - Rec. T.418 17
This presentation attribute specifies default values for VDC Type, Integer
Precision, Real Precision, Index Precision, Colour Precision, Colour Index Precision,
Maximum Colour Index, Colour Value Extent, Colour Selection Mode, VDC Integer Precision
and VDC Real Precision.
This presentation attribute also determines the encoding of parameters of the
remainder of the CGM default attributes.
6.1.1.2 Line rendition
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
───────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
───────────┤
│ Line width │absolute, scaled │ scaled
│
│ specification mode │ │
│
│ │ │
│
│ Line bundle index │any integer > 0 │ 1
│
│ │ │
│
│ Line type │1 through 5 plus any registered │
│
│ │line type > 5 (see Note) │ 1 (solid)
│
│ │ │
│
│ Line width │ │
│
│ (if scaled) │any real > 0,0 │ 1,0
│
│ (if absolute) │any non-negative VDC Value │ 0,001 x length of
longest │
│ │ │ side of default
VDC extent │
│ │ │
│
│ Line colour │ │
│
│ (if indexed) │any integer > 0 │ 1
│
│ (if direct) │any Direct Colour Value │ foreground
│
│ │ │
│
│ Line aspect source │any three-tuple of │
│
│ flags │(line type asf, line width asf, │ (individual,
individual, │
│ │line colour asf) │ individual)
│
│ line type asf │bundled, individual │
│
│ line width asf │bundled, individual │
│
│ line colour asf │bundled, individual │
18 Fascicle VII.6 - Rec. T.418
│
│ │ │
│
│ Line bundle │any list containing zero, one │ empty list
│
│ specifications │or more elements │
│
│ line bundle index │any integer > 0 │
│
│ line bundle │any three-tuple of │
│
│ representation │(line type, line width, line │
│
│ │colour) │
│
│ line type │as for individual │
│
│ line width │ │
│
│ (if scaled) │as for individual │
│
│ (if absolute) │as for individual │
│
│ line colour │ │
│
│ (if indexed) │as for individual │
│
│ (if direct) │as for individual │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
───────────┘
Note - The permissible values of the parameter are restricted to values which are
standardized and registered. Private values are not permitted.
This presentation attribute sets default values used for the presentation of the
line primitives in the geometric graphics content portion. It specifies the default
values for the Line Width Specification Mode, the Line Bundle Index, the individual CGM
line attributes, the line aspect source flags and specifies the default line bundle
representations.
Fascicle VII.6 - Rec. T.418 19
The line bundle specifications parameter defines the initial line representations
to be used for imaging a basic object. For each unspecified representation the values
in Table 2/T.418 apply.
This parameter consists of a list of zero, one or more pairs. Each pair consists
of:
a) line bundle index;
b) line bundle representation, which supplies values for the bundled CGM line
attributes.
6.1.1.3 Marker rendition
w
┌─────────────────────────┬─────────────────────────────────┬─────────────────
────────────┐
│ Parameter │ Permissible values │
Default │
├─────────────────────────┼─────────────────────────────────┼─────────────────
────────────┤
│Marker size specification│absolute, scaled │ scaled
│
│mode │ │
│
│ │ │
│
│Marker bundle index │any integer > 0 │ 1
│
│ │ │
│
│Marker type │1 to 5 plus any registered marker│
│
│ │type > 5 (see Note) │ 3 (asterisk)
│
│ │ │
│
│Marker size │ │
│
│ (if scaled) │any real ≥ 0,0 │ 1,0
│
│ (if absolute) │any non-negative VDC value │ 0,01 ╧ length of
longest │
│ │ │ side of default
VDC extent │
│ │ │
│
│Marker colour │ │
│
│ (if indexed) │any integer ≥ 0 │ 1
│
│ (if direct) │any Direct Colour Value │ foreground
│
│ │ │
│
│Marker aspect source │any three-tuple of │
│
│flags │(marker-type asf, marker size │ (individual,
individual, │
│ │asf, marker colour asf) │ individual)
│
│ marker type asf │bundled, individual │
│
│ marker size asf │bundled, individual │
20 Fascicle VII.6 - Rec. T.418
│
│ marker colour asf │bundled, individual │
│
│ │ │
│
│Marker bundle │any list containing zero, one │ empty list
│
│specifications │or more elements │
│
│ marker bundle index │any integer > 0 │
│
│ marker bundle │any three-tuple of │
│
│ representation │(marker type, marker size, │
│
│ │marker colour) │
│
│ marker type │as for individual │
│
│ marker size │ │
│
│ (if scaled) │as for individual │
│
│ (if absolute) │as for individual │
│
│ marker colour │ │
│
│ (if indexed) │as for individual │
│
│ (if direct) │as for individual │
│
└─────────────────────────┴─────────────────────────────────┴─────────────────
────────────┘
Note - The permissible values of the parameter are restricted to values which are
standardized and registered. Private values are not permitted.
This presentation attribute sets default values used for the rendition of the
marker primitives in the geometric graphics content portion. It specifies the default
values for the Marker Size Specification Mode, the Marker Bundle Index, the individual
CGM marker attributes, the marker aspect source flags and specifies the default marker
bundle representations.
The marker bundle specifications parameter defines the initial marker
representations to be used for imaging a basic object. For each unspecified
representation the values in Table 2/T.418 apply.
Fascicle VII.6 - Rec. T.418 21
This parameter consists of a list of zero, one or more pairs. Each pair consists
of:
a) marker bundle index;
b) marker bundle representation, which supplies values for the bundled CGM
marker attributes.
6.1.1.4 Text rendition
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
────────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
────────────┤
│ Font list │any list of registered font │List containing
one element: │
│ │names (see Note) │the registered
name of any │
│ │ │font that can
represent the │
│ │nationality-
independent │
│ │ │character subset
of │
│ │ │Recommendation
T.50 │
│ │ │
│
│ Character set list │any list of │(94-character
sets, │
│ │(character set type, designation │designation
sequence tail │
│ │sequence tail) │that is registered
for a │
│ │ │character set
which includes │
│ │ │the nationality-
independent │
│ │ │subset of
Recommendation T.50 │
│ │ │in the positions
specified in │
│ │ │Recommendation
T.50) │
│ │ │
│
│ Character set type │94-character sets, 96-character │
│
│ │sets, 94-character multibyte │
│
│ │sets, 96-character multibyte │
│
│ │sets, complete code │
│
│ Designation sequence │any registered designation │
│
│ tail │sequence tail (see Note) │
│
│ │ │
│
22 Fascicle VII.6 - Rec. T.418
│ Character coding │basic 7-bit, basic 8-bit, │basic 7-bit
│
│ announcer │extended 7-bit, extended 8-bit │
│
│ │(see Note) │
│
│ │ │
│
│ Text bundle index │any integer > 0 │1
│
│ │ │
│
│ Text font index │any integer > 0 │1
│
│ │ │
│
│ Text precision │string, character, stroke │string
│
│ Character expansion │any real > 0,0 │1.0
│
│ factor │ │
│
│ │ │
│
│ Character spacing │any real │0.0
│
│ │ │
│
│ Text colour │ │
│
│ (if indexed) │any integer ≥ 0 │1
│
│ (if direct) │any direct colour value │foreground
│
│ │ │
│
│ Character height │any non-negative VDC value │0.1 ╧ length of
the longest │
│ │ │side of the
default VDC extent│
│ │ │
│
│ Character orientation │any pair of VDC Vectors which │((0;1), (1;0))
│
│ │have non-zero length and are not │
│
│ │collinear │
│
│ │ │
│
│ Text path │right, left, up, down │right
│
└────────────────────────┴─────────────────────────────────┴──────────────────
────────────┘
Fascicle VII.6 - Rec. T.418 23
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
────────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
────────────┤
│ Text alignment │any four-tuple of │
│
│ │(horizontal alignment, vertical │(normal
horizontal, │
│ │alignment, continuous horizontal │normal vertical
n/a, n/a) │
│ │alignment, continuous vertical │
│
│ │alignment) │
│
│ │ │
│
│ horizontal alignment │normal horizontal, left, centre, │
│
│ │right, continuous horizontal │
│
│ │ │
│
│ vertical alignment │normal vertical, top, cap, half, │
│
│ │base, bottom, continuous vertical│
│
│ │ │
│
│ continuous horizontal │ │
│
│ alignment │any real │
│
│ │ │
│
│ continuous vertical │ │
│
│ alignment │any real │
│
│ │ │
│
│ Character set index │any integer > 0 │1
│
│ │ │
│
│ Alternate character │ │
│
│ set index │any integer > 0 │1
│
│ │ │
│
│ Text aspect source │any five-tuple of │
│
│ flags │(text font index asf, text │(individual,
individual, │
│ │precision asf, character │individual,
individual, │
│ │expansion factor asf, character │individual)
│
│ │spacing asf, text colour asf) │
│
24 Fascicle VII.6 - Rec. T.418
│ │ │
│
│ text font asf │bundled, individual │
│
│ │ │
│
│ text precision asf │bundled, individual │
│
│ │ │
│
│ character expansion │ │
│
│ factor asf │bundled, individual │
│
│ │ │
│
│ character spacing asf│bundled, individual │
│
│ │ │
│
│ text colour asf │bundled, individual │
│
│ │ │
│
│ Text bundle │any list containing zero, one │empty list
│
│ specifications │or more elements │
│
│ │ │
│
│ Text bundle index │any integer > 0 │
│
│ text bundle │any five-tuple of │
│
│ representation │(text font index, text precision,│
│
│ │character expansion factor, │
│
│ │character spacing, text colour) │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
────────────┘
Fascicle VII.6 - Rec. T.418 25
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
────────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
────────────┤
│ Text font index │as for individual │
│
│ │ │
│
│ Text precision │as for individual │
│
│ │ │
│
│ Character expansion │ │
│
│ factor │as for individual │
│
│ │ │
│
│ Character spacing │as for individual │
│
│ │ │
│
│ Text colour │ │
│
│ (if indexed) │as for individual │
│
│ (if direct) │as for individual │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
────────────┘
Note - The permissible values of the parameter are restricted to values which are
standardized and registered. Private values are not permitted.
This presentation attribute sets default values used for the rendition of the text
primitives in the geometric graphics content portion. It specifies the default values
for the Font List, Character Set List, Character Coding Announcer, the Text Bundle
Index, the individual CGM text attributes, the text aspect source flags and specifies
the default text bundle representations.
The text bundle specifications parameter defines the initial text representations
to be used for imaging a basic object. For each unspecified representation the values
in Table 2/T.418 apply.
This parameter consists of a list of zero, one or more pairs. Each pair consists
of:
a) text bundle index;
b) text bundle representation, which supplies values for the bundled CGM text
attributes.
6.1.1.5 Filled area rendition
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
────────────┐
│ Parameter │ Permissible values │ Default
26 Fascicle VII.6 - Rec. T.418
│
├────────────────────────┼─────────────────────────────────┼──────────────────
────────────┤
│ Fill bundle index │any integer > 0 │1
│
│ │ │
│
│ Interior style │hollow, solid, pattern, hatch, │hollow
│
│ │empty │
│
│ │ │
│
│ Fill colour │ │
│
│ (if indexed) │any integer > 0 │1
│
│ (if direct) │any direct colour value │foreground
│
│ │ │
│
│ Hatch index │1 through 6 plus any registered │1
│
│ │hatch index > 6 (see Note) │(horizontal
equally spaced │
│ │ │parallel lines)
│
│ │ │
│
│ Pattern index │any integer > 0 │1
│
│ │ │
│
│ Fill reference point │any virtual device coordinate │First corner of
default VDC │
│ │ │Extent
│
└────────────────────────┴─────────────────────────────────┴──────────────────
────────────┘
Fascicle VII.6 - Rec. T.418 27
w
┌────────────────────────┬──────────────────────────────────┬─────────────────
────────────┐
│ Parameter │ Permissible values │
Default │
├────────────────────────┼──────────────────────────────────┼─────────────────
────────────┤
│ Pattern size │any four-tuple of │(0, height of
default VDC │
│ │(height vector x component, │Extent, width of
default VDC │
│ │height vector y component, │Extent, 0)
│
│ │width vector x component, │
│
│ │width vector y component) │
│
│ height vector x │any VDC value │
│
│ component │ │
│
│ │ │
│
│ height vector y │any VDC value │
│
│ component │ │
│
│ │ │
│
│ width vector x │any VDC value │
│
│ component │ │
│
│ │ │
│
│ width vector y │any VDC value │
│
│ component │ │
│
│ │ │
│
│ Pattern table │any list containing zero, one │empty list
│
│ specifications │or more pattern table elements │
│
│ pattern table index │any integer > 0 │
│
│ │ │
│
│ nx (number of columns│any integer > 0 │
│
│ in pattern) │ │
│
│ │ │
│
│ ny (number of rows in│any integer > 0 │
│
│ pattern) │ │
│
│ │ │
│
│ local colour recision│0, 1, 2, 4, 8, 16, 24, 32 │
│
28 Fascicle VII.6 - Rec. T.418
│ │ │
│
│ Colour │ │
│
│ index array │nx * ny cells of any integer ≥ 0 │
│
│ (if indexed) │ │
│
│ value array │nx * ny cells of any direct colour│
│
│ (if direct) │Value │
│
│ │ │
│
│ Fill aspect source │any four-tuple of │
│
│ flags │(interior style asf, fill colour │(individual,
individual │
│ │asf, hatch index asf, patter │individual,
individual) │
│ │index asf) │
│
│ interior style asf │bundled, individual │
│
│ │ │
│
│ fill colour asf │bundled, individual │
│
│ │ │
│
│ hatch index asf │bundled, individual │
│
│ │ │
│
│ pattern index asf │bundled, individual │
│
│ │ │
│
│ Fill bundle │any list containing zero, one │empty list
│
│ specifications │or more elements │
│
└────────────────────────┴──────────────────────────────────┴─────────────────
────────────┘
Fascicle VII.6 - Rec. T.418 29
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
────────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
────────────┤
│ Fill bundle index │any integer > 0 │
│
│ Fill bundle │any four-tuple of │
│
│ representation │(interior style, fill colour, │
│
│ │hatch index, pattern index) │
│
│ │ │
│
│ Interior style │as for individual │
│
│ │ │
│
│ Fill colour │ │
│
│ (if indexed) │as for individual │
│
│ (if direct) │as for individual │
│
│ │ │
│
│ Hatch index │as for individual │
│
│ │ │
│
│ Pattern index │as for individual │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
────────────┘
Note - The permissible values for the parameter are restricted to values which are
standardized and registered. Private values are not permitted.
This presentation attribute sets default values used for the presentation of the
interior of filled area primitives of a geometric graphics content portion. It
specifies the default values for the Fill Bundle Index, the individual CGM filled area
attributes, the pattern representations, the filled area aspect source flags and
default fill bundle representations, applicable to the interior region of the filled
area.
The pattern table specifications parameter is a list which supplies a complete set
of values for zero, one or more pattern table entries. For each unspecified pattern
table entry the values in Table 3/T.418 apply.
The fill bundle specifications parameter defines the initial bundle
representations to be used for imaging a basic objet. For each unspecified
representation the values in Table 2/T.418 apply.
This parameter consists of a list of zero, one or more pairs. Each pair consists
of:
a) fill bundle index;
b) fill bundle representation, which supplies values for the bundled CGM filled
area attributes.
30 Fascicle VII.6 - Rec. T.418
6.1.1.6 Edge rendition
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
───────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
───────────┤
│ Edge width │absolute, scaled │ scaled
│
│ specification mode │ │
│
│ │ │
│
│ Edge visibility │off, on │ off
│
│ │ │
│
│ Edge bundle index │any integer > 0 │ 1
│
│ │ │
│
│ Edge type │1 through 5 plus any registered │
│
│ │line type (see Note) │ 1 (solid)
│
│ │ │
│
│ Edge width │ │
│
│ (if scaled) │any real > 0,0 │ 1.0
│
│ (if absolute) │any non-negative VDC value │ 0.001 ╧ length of
longest │
│ │ │ side of default
VDC extent │
└────────────────────────┴─────────────────────────────────┴──────────────────
───────────┘
Fascicle VII.6 - Rec. T.418 31
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
───────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
───────────┤
│ Edge colour │ │
│
│ (if indexed) │any integer > 0 │ 1
│
│ (if direct) │any direct colour value │ foreground
│
│ │ │
│
│ Edge aspect source │any three-tuple of │ (individual,
│
│ flag │(edge type asf, edge width asf, │ individual,
│
│ │edge colour asf) │ individual)
│
│ edge type asf │bundled, individual │
│
│ edge width asf │bundled, individual │
│
│ edge colour asf │bundled, individual │
│
│ │ │
│
│ Edge bundle │any list containing zero, one or │ empty list
│
│ specifications │more elements │
│
│ Edge bundle index │any integer > 0 │
│
│ Edge bundle │any three-tuple of │
│
│ representation │(edge type, edge width, edge │
│
│ │colour) │
│
│ Edge type │as for individual │
│
│ Edge width │ │
│
│ (if scaled) │as for individual │
│
│ (if absolute) │as for individual │
│
│ Edge colour │ │
│
│ (if indexed) │as for individual │
│
│ (if direct) │as for individual │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
───────────┘
Note - The permissible values of the parameter are restricted to values which are
standardized and registered. Private values are not permitted.
This presentation attribute sets default values used for the presentation of the
edges of the filled area primitives in the geometric graphics content portion. It
32 Fascicle VII.6 - Rec. T.418
specifies the default values for the Edge Width Specification Mode, the Edge
Visibility, the Edge Bundle Index, the individual CGM edge attributes, the edge aspect
source flags and specifies the default edge bundle representations, applicable to the
boundary of the filled area.
The edge bundle specifications parameter defines the initial edge representations
to be used for imaging a basic object. For each unspecified representation the values
in Table 2/T.418 apply.
This parameter consists of a list of zero, one or more pairs. Each pair consists
of:
a) edge bundle index;
b) edge bundle representation, which supplies values for the bundled CGM edge
attributes.
6.1.1.7 Colour representations
w
┌────────────────────────┬─────────────────────────────────┬──────────────────
───────────┐
│ Parameter │ Permissible values │ Default
│
├────────────────────────┼─────────────────────────────────┼──────────────────
───────────┤
│ Background colour │any direct colour value │ background
│
│ │ │
│
│ Colour table │any list containing zero, one or │ empty list
│
│ specifications │more colour table elements │
│
│ │ │
│
│ Starting index │any integer ≥ 0 │
│
│ │ │
│
│ Colour list │any list containing one or more │
│
│ │direct colour values │
│
└────────────────────────┴─────────────────────────────────┴──────────────────
───────────┘
) This text is aligned with the final text of the corresponding International
Standard ISO 8613 1.
Fascicle VII.6 - Rec. T.418 33
