Information technology — Computer graphics — Metafile for the storage and transfer of picture description information — Part 1: Functional specification

ISO/IEC 8632 provides a file format suitable for the storage and retrieval of picture description information. The file format consists of an ordered set of elements that may be used to describe pictures in a way that is compatible between systems of different architectures, compatible with devices of differing capabilities and design, and meaningful to application constituencies. This picture description includes the capability for describing static images. The elements specified provide for the representation of a wide range of pictures on a wide range of graphical devices. The elements are organized into groups that delimit major structures (metafiles, pictures, and application structures), that specify the representations used within the metafile, that control the display of the picture, that perform basic drawing actions, that control the attributes of the basic drawing actions, that allow application-specific structuring to be overlaid on the graphical content, and that provide access to non-standard device capabilities. The metafile is defined in such a way that, in addition to sequential access to the whole metafile, random access to individual pictures and individual context-independent application structures is well-defined. Applications which require random access to pictures and/or context-independent application structures within pictures may, within the metafile, define directories to these pictures and/or context-independent application structures. The metafile may then be opened and randomly accessed without interpreting the entire metafile. In addition to a functional specification, two standard encodings of the metafile syntax are specified. These encodings address the needs of applications that require small metafile size plus minimum effort to generate and interpret, and maximum flexibility for a human reader or editor of the metafile. This part of ISO/IEC 8632 describes the format using an abstract syntax. The remaining parts of ISO 8632 specify standardized encodings that conform to this syntax: ISO/IEC 8632-3 specifies a binary encoding; ISO/IEC 8632-4 specifies a clear text encoding.

Technologies de l'information — Infographie — Métafichier de stockage et de transfert des informations de description d'images — Partie 1: Description fonctionnelle

General Information

Status
Published
Publication Date
15-Dec-1999
Current Stage
9093 - International Standard confirmed
Start Date
06-Jan-2005
Completion Date
08-Dec-2021
Ref Project

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INTERNATIONAL ISO/IEC
STANDARD 8632-1
Second edition
1999-12-15
Information technology — Computer
graphics — Metafile for the storage and
transfer of picture description
information —
Part 1:
Functional specification
Technologies de l'information — Infographie — Métafichier de stockage
et de transfert des informations de description d'images —
Partie 1: Description fonctionnelle
Reference number
ISO/IEC 8632-1:1999(E)
ISO/IEC 1999
---------------------- Page: 1 ----------------------
ISO/IEC 8632-1:1999(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not

be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this

file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this

area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters

were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event

that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO/IEC 1999

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body

in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO/IEC 1999 – All rights reserved
---------------------- Page: 2 ----------------------
© ISO/IEC
ISO/IEC 8632-1:1999(E)
Contents
Page

1 Scope......................................................................................................................................................1

2 Conformance .........................................................................................................................................1

3 Normative references............................................................................................................................1

4 Terms and definitions...........................................................................................................................3

4.1 Definitions..............................................................................................................................................3

5 Symbols and abbreviated terms........................................................................................................11

6 Concepts ..............................................................................................................................................12

6.1 Introduction .........................................................................................................................................12

6.2 Delimiter elements ..............................................................................................................................13

6.3 Metafile descriptor elements..............................................................................................................13

6.3.1 Identification........................................................................................................................................14

6.3.2 Functional capability...........................................................................................................................14

6.3.3 Default metafile state ..........................................................................................................................17

6.3.4 Fonts and character sets....................................................................................................................17

6.3.5 Picture directory..................................................................................................................................22

6.4 Picture descriptor elements...............................................................................................................22

6.4.1 Scaling mode.......................................................................................................................................23

6.4.2 Colour selection mode........................................................................................................................23

6.4.3 Specification modes ...........................................................................................................................23

6.4.4 VDC extent ...........................................................................................................................................23

6.4.5 CGM tailoring.......................................................................................................................................24

6.4.6 Background colour .............................................................................................................................26

6.4.7 Device viewport control......................................................................................................................26

6.4.8 Representations ..................................................................................................................................26

6.4.9 Definable attributes.............................................................................................................................27

6.4.10 Application structure directory..........................................................................................................27

6.5 Control elements.................................................................................................................................27

6.5.1 VDC space and range .........................................................................................................................27

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

6.5.2 Clipping................................................................................................................................................27

6.5.3 Save and restore primitive context ...................................................................................................28

6.5.4 Compound clipping and shielding ....................................................................................................29

6.5.5 Generalized text path..........................................................................................................................32

6.5.6 Mitre limit .............................................................................................................................................32

6.5.7 Transparent cell colour ......................................................................................................................32

6.6 Graphical primitive elements.............................................................................................................32

6.6.1 Line elements ......................................................................................................................................34

6.6.2 Marker elements..................................................................................................................................36

6.6.3 Text elements ......................................................................................................................................37

6.6.4 Filled-area elements............................................................................................................................38

6.6.5 Cell elements .......................................................................................................................................39

6.6.6 Circular arc elements..........................................................................................................................44

6.6.7 Elliptical elements...............................................................................................................................44

6.6.8 Hyperbolic arc element.......................................................................................................................44

6.6.9 Parabolic arc element.........................................................................................................................45

6.6.10 Spline curve elements ........................................................................................................................49

6.6.11 Closed figures .....................................................................................................................................51

6.6.12 Symbol elements.................................................................................................................................58

6.7 Attribute elements...............................................................................................................................58

6.7.1 Line attributes .....................................................................................................................................60

6.7.2 Marker attributes .................................................................................................................................62

6.7.3 Text attributes .....................................................................................................................................64

6.7.4 Filled-area attributes...........................................................................................................................87

6.7.5 Specification modes and transformation of aspects ......................................................................90

6.7.6 Colour attributes .................................................................................................................................91

6.7.7 Pick identifier.......................................................................................................................................93

6.7.8 Compound text path ...........................................................................................................................93

6.7.9 Symbol Attributes ...............................................................................................................................93

6.8 Escape elements .................................................................................................................................94

6.9 External elements ...............................................................................................................................95

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

6.10 Segment elements...............................................................................................................................95

6.10.1 Introduction .........................................................................................................................................95

6.10.2 Local and global segments ................................................................................................................95

6.10.3 Delimiting and naming segments......................................................................................................96

6.10.4 Segment attributes..............................................................................................................................96

6.10.5 Copy segment and inheritance..........................................................................................................97

6.11 Metafile states....................................................................................................................................102

6.12 Registration .......................................................................................................................................113

6.13 Application Structure Elements.......................................................................................................113

6.13.1 Introduction .......................................................................................................................................113

6.13.2 Location of and access to Application Structures ........................................................................114

6.13.3 Nesting of Application Structures...................................................................................................114

6.13.4 Graphical Context of Application Structures .................................................................................114

6.13.5 Application Structure Attributes......................................................................................................114

6.13.6 Relationship between application structures and segments .......................................................115

7 Abstract specification of elements..................................................................................................118

7.1 Introduction .......................................................................................................................................118

7.2 Delimiter elements ............................................................................................................................120

7.2.1 BEGIN METAFILE..............................................................................................................................120

7.2.2 END METAFILE..................................................................................................................................121

7.2.3 BEGIN PICTURE ................................................................................................................................121

7.2.4 BEGIN PICTURE BODY.....................................................................................................................122

7.2.5 END PICTURE....................................................................................................................................122

7.2.6 BEGIN SEGMENT ..............................................................................................................................122

7.2.7 END SEGMENT..................................................................................................................................123

7.2.8 BEGIN FIGURE ..................................................................................................................................123

7.2.9 END FIGURE ......................................................................................................................................123

7.2.10 BEGIN PROTECTION REGION .........................................................................................................124

7.2.11 END PROTECTION REGION.............................................................................................................124

7.2.12 BEGIN COMPOUND LINE .................................................................................................................124

7.2.13 END COMPOUND LINE .....................................................................................................................124

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.2.14 BEGIN COMPOUND TEXT PATH .....................................................................................................125

7.2.15 END COMPOUND TEXT PATH .........................................................................................................125

7.2.16 BEGIN TILE ARRAY ..........................................................................................................................125

7.2.17 END TILE ARRAY ..............................................................................................................................126

7.2.18 BEGIN APPLICATION STRUCTURE ................................................................................................127

7.2.19 BEGIN APPLICATION STRUCTURE BODY.....................................................................................127

7.2.20 END APPLICATION STRUCTURE....................................................................................................127

7.3 Metafile descriptor elements............................................................................................................128

7.3.1 METAFILE VERSION.........................................................................................................................128

7.3.2 METAFILE DESCRIPTION.................................................................................................................128

7.3.3 VDC TYPE ..........................................................................................................................................128

7.3.4 INTEGER PRECISION .......................................................................................................................129

7.3.5 REAL PRECISION..............................................................................................................................129

7.3.6 INDEX PRECISION ............................................................................................................................129

7.3.7 COLOUR PRECISION........................................................................................................................129

7.3.8 COLOUR INDEX PRECISION............................................................................................................130

7.3.9 MAXIMUM COLOUR INDEX..............................................................................................................130

7.3.10 COLOUR VALUE EXTENT ................................................................................................................130

7.3.11 METAFILE ELEMENT LIST ...............................................................................................................131

7.3.12 METAFILE DEFAULTS REPLACEMENT .........................................................................................132

7.3.13 FONT LIST..........................................................................................................................................132

7.3.14 CHARACTER SET LIST.....................................................................................................................133

7.3.15 CHARACTER CODING ANNOUNCER .............................................................................................133

7.3.16 NAME PRECISION.............................................................................................................................134

7.3.17 MAXIMUM VDC EXTENT...................................................................................................................135

7.3.18 SEGMENT PRIORITY EXTENT .........................................................................................................135

7.3.19 COLOUR MODEL...............................................................................................................................135

7.3.20 COLOUR CALIBRATION...................................................................................................................136

7.3.21 FONT PROPERTIES ..........................................................................................................................138

7.3.22 GLYPH MAPPING ..............................................................................................................................140

7.3.23 SYMBOL LIBRARY LIST...................................................................................................................142

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.3.24 PICTURE DIRECTORY ......................................................................................................................142

7.4 Picture descriptor elements.............................................................................................................142

7.4.1 SCALING MODE ................................................................................................................................142

7.4.2 COLOUR SELECTION MODE ...........................................................................................................143

7.4.3 LINE WIDTH SPECIFICATION MODE...............................................................................................143

7.4.4 MARKER SIZE SPECIFICATION MODE...........................................................................................144

7.4.5 EDGE WIDTH SPECIFICATION MODE.............................................................................................144

7.4.6 VDC EXTENT......................................................................................................................................145

7.4.7 BACKGROUND COLOUR .................................................................................................................145

7.4.8 DEVICE VIEWPORT...........................................................................................................................146

7.4.9 DEVICE VIEWPORT SPECIFICATION MODE..................................................................................146

7.4.10 DEVICE VIEWPORT MAPPING.........................................................................................................147

7.4.11 LINE REPRESENTATION..................................................................................................................147

7.4.12 MARKER REPRESENTATION ..........................................................................................................148

7.4.13 TEXT REPRESENTATION.................................................................................................................148

7.4.14 FILL REPRESENTATION ..................................................................................................................149

7.4.15 EDGE REPRESENTATION................................................................................................................149

7.4.16 INTERIOR STYLE SPECIFICATION MODE......................................................................................150

7.4.17 LINE AND EDGE TYPE DEFINITION ................................................................................................150

7.4.18 HATCH STYLE DEFINITION..............................................................................................................151

7.4.19 GEOMETRIC PATTERN DEFINITION...............................................................................................152

7.4.20 APPLICATION STRUCTURE DIRECTORY ......................................................................................152

7.5 Control elements...............................................................................................................................153

7.5.1 VDC INTEGER PRECISION...............................................................................................................153

7.5.2 VDC REAL PRECISION .....................................................................................................................153

7.5.3 AUXILIARY COLOUR ........................................................................................................................153

7.5.4 TRANSPARENCY ..............................................................................................................................154

7.5.5 CLIP RECTANGLE.............................................................................................................................154

7.5.6 CLIP INDICATOR ...............................................................................................................................155

7.5.7 LINE CLIPPING MODE ......................................................................................................................155

7.5.8 MARKER CLIPPING MODE...............................................................................................................155

vii
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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.5.9 EDGE CLIPPING MODE ....................................................................................................................156

7.5.10 NEW REGION.....................................................................................................................................156

7.5.11 SAVE PRIMITIVE CONTEXT .............................................................................................................156

7.5.12 RESTORE PRIMITIVE CONTEXT .....................................................................................................157

7.5.13 PROTECTION REGION INDICATOR ................................................................................................158

7.5.14 GENERALIZED TEXT PATH MODE .................................................................................................158

7.5.15 MITRE LIMIT.......................................................................................................................................158

7.5.16 TRANSPARENT CELL COLOUR......................................................................................................159

7.6 Graphical primitive elements...........................................................................................................159

7.6.1 POLYLINE ..........................................................................................................................................159

7.6.2 DISJOINT POLYLINE.........................................................................................................................159

7.6.3 POLYMARKER...................................................................................................................................160

7.6.4 TEXT ...................................................................................................................................................160

7.6.5 RESTRICTED TEXT...........................................................................................................................161

7.6.6 APPEND TEXT ...................................................................................................................................162

7.6.7 POLYGON ..........................................................................................................................................163

7.6.8 POLYGON SET ..................................................................................................................................164

7.6.9 CELL ARRAY .....................................................................................................................................166

7.6.10 GENERALIZED DRAWING PRIMITIVE (GDP) .................................................................................168

7.6.11 RECTANGLE......................................................................................................................................168

7.6.12 CIRCLE...............................................................................................................................................168

7.6.13 CIRCULAR ARC 3 POINT..................................................................................................................169

7.6.14 CIRCULAR ARC 3 POINT CLOSE ....................................................................................................169

7.6.15 CIRCULAR ARC CENTRE.................................................................................................................172

7.6.16 CIRCULAR ARC CENTRE CLOSE ...................................................................................................172

7.6.17 ELLIPSE .............................................................................................................................................173

7.6.18 ELLIPTICAL ARC...............................................................................................................................173

7.6.19 ELLIPTICAL ARC CLOSE .................................................................................................................174

7.6.20 CIRCULAR ARC CENTRE REVERSED............................................................................................175

7.6.21 CONNECTING EDGE.........................................................................................................................176

7.6.22 HYPERBOLIC ARC............................................................................................................................176

viii
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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.6.23 PARABOLIC ARC ..............................................................................................................................177

7.6.24 NON-UNIFORM B-SPLINE ................................................................................................................177

7.6.25 NON-UNIFORM RATIONAL B-SPLINE.......................................................

...

INTERNATIONAL ISO/IEC
STANDARD 8632-1
Second edition
1999-12-15
Information technology — Computer
graphics — Metafile for the storage and
transfer of picture description
information —
Part 1:
Functional specification
Technologies de l'information — Infographie — Métafichier de stockage
et de transfert des informations de description d'images —
Partie 1: Description fonctionnelle
Reference number
ISO/IEC 8632-1:1999(E)
ISO/IEC 1999
---------------------- Page: 1 ----------------------
ISO/IEC 8632-1:1999(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not

be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this

file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this

area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters

were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event

that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO/IEC 1999

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body

in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO/IEC 1999 – All rights reserved
---------------------- Page: 2 ----------------------
© ISO/IEC
ISO/IEC 8632-1:1999(E)
Contents
Page

1 Scope......................................................................................................................................................1

2 Conformance .........................................................................................................................................1

3 Normative references............................................................................................................................1

4 Terms and definitions...........................................................................................................................3

4.1 Definitions..............................................................................................................................................3

5 Symbols and abbreviated terms........................................................................................................11

6 Concepts ..............................................................................................................................................12

6.1 Introduction .........................................................................................................................................12

6.2 Delimiter elements ..............................................................................................................................13

6.3 Metafile descriptor elements..............................................................................................................13

6.3.1 Identification........................................................................................................................................14

6.3.2 Functional capability...........................................................................................................................14

6.3.3 Default metafile state ..........................................................................................................................17

6.3.4 Fonts and character sets....................................................................................................................17

6.3.5 Picture directory..................................................................................................................................22

6.4 Picture descriptor elements...............................................................................................................22

6.4.1 Scaling mode.......................................................................................................................................23

6.4.2 Colour selection mode........................................................................................................................23

6.4.3 Specification modes ...........................................................................................................................23

6.4.4 VDC extent ...........................................................................................................................................23

6.4.5 CGM tailoring.......................................................................................................................................24

6.4.6 Background colour .............................................................................................................................26

6.4.7 Device viewport control......................................................................................................................26

6.4.8 Representations ..................................................................................................................................26

6.4.9 Definable attributes.............................................................................................................................27

6.4.10 Application structure directory..........................................................................................................27

6.5 Control elements.................................................................................................................................27

6.5.1 VDC space and range .........................................................................................................................27

iii
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© ISO/IEC
ISO/IEC 8632-1:1999(E)

6.5.2 Clipping................................................................................................................................................27

6.5.3 Save and restore primitive context ...................................................................................................28

6.5.4 Compound clipping and shielding ....................................................................................................29

6.5.5 Generalized text path..........................................................................................................................32

6.5.6 Mitre limit .............................................................................................................................................32

6.5.7 Transparent cell colour ......................................................................................................................32

6.6 Graphical primitive elements.............................................................................................................32

6.6.1 Line elements ......................................................................................................................................34

6.6.2 Marker elements..................................................................................................................................36

6.6.3 Text elements ......................................................................................................................................37

6.6.4 Filled-area elements............................................................................................................................38

6.6.5 Cell elements .......................................................................................................................................39

6.6.6 Circular arc elements..........................................................................................................................44

6.6.7 Elliptical elements...............................................................................................................................44

6.6.8 Hyperbolic arc element.......................................................................................................................44

6.6.9 Parabolic arc element.........................................................................................................................45

6.6.10 Spline curve elements ........................................................................................................................49

6.6.11 Closed figures .....................................................................................................................................51

6.6.12 Symbol elements.................................................................................................................................58

6.7 Attribute elements...............................................................................................................................58

6.7.1 Line attributes .....................................................................................................................................60

6.7.2 Marker attributes .................................................................................................................................62

6.7.3 Text attributes .....................................................................................................................................64

6.7.4 Filled-area attributes...........................................................................................................................87

6.7.5 Specification modes and transformation of aspects ......................................................................90

6.7.6 Colour attributes .................................................................................................................................91

6.7.7 Pick identifier.......................................................................................................................................93

6.7.8 Compound text path ...........................................................................................................................93

6.7.9 Symbol Attributes ...............................................................................................................................93

6.8 Escape elements .................................................................................................................................94

6.9 External elements ...............................................................................................................................95

---------------------- Page: 4 ----------------------
© ISO/IEC
ISO/IEC 8632-1:1999(E)

6.10 Segment elements...............................................................................................................................95

6.10.1 Introduction .........................................................................................................................................95

6.10.2 Local and global segments ................................................................................................................95

6.10.3 Delimiting and naming segments......................................................................................................96

6.10.4 Segment attributes..............................................................................................................................96

6.10.5 Copy segment and inheritance..........................................................................................................97

6.11 Metafile states....................................................................................................................................102

6.12 Registration .......................................................................................................................................113

6.13 Application Structure Elements.......................................................................................................113

6.13.1 Introduction .......................................................................................................................................113

6.13.2 Location of and access to Application Structures ........................................................................114

6.13.3 Nesting of Application Structures...................................................................................................114

6.13.4 Graphical Context of Application Structures .................................................................................114

6.13.5 Application Structure Attributes......................................................................................................114

6.13.6 Relationship between application structures and segments .......................................................115

7 Abstract specification of elements..................................................................................................118

7.1 Introduction .......................................................................................................................................118

7.2 Delimiter elements ............................................................................................................................120

7.2.1 BEGIN METAFILE..............................................................................................................................120

7.2.2 END METAFILE..................................................................................................................................121

7.2.3 BEGIN PICTURE ................................................................................................................................121

7.2.4 BEGIN PICTURE BODY.....................................................................................................................122

7.2.5 END PICTURE....................................................................................................................................122

7.2.6 BEGIN SEGMENT ..............................................................................................................................122

7.2.7 END SEGMENT..................................................................................................................................123

7.2.8 BEGIN FIGURE ..................................................................................................................................123

7.2.9 END FIGURE ......................................................................................................................................123

7.2.10 BEGIN PROTECTION REGION .........................................................................................................124

7.2.11 END PROTECTION REGION.............................................................................................................124

7.2.12 BEGIN COMPOUND LINE .................................................................................................................124

7.2.13 END COMPOUND LINE .....................................................................................................................124

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.2.14 BEGIN COMPOUND TEXT PATH .....................................................................................................125

7.2.15 END COMPOUND TEXT PATH .........................................................................................................125

7.2.16 BEGIN TILE ARRAY ..........................................................................................................................125

7.2.17 END TILE ARRAY ..............................................................................................................................126

7.2.18 BEGIN APPLICATION STRUCTURE ................................................................................................127

7.2.19 BEGIN APPLICATION STRUCTURE BODY.....................................................................................127

7.2.20 END APPLICATION STRUCTURE....................................................................................................127

7.3 Metafile descriptor elements............................................................................................................128

7.3.1 METAFILE VERSION.........................................................................................................................128

7.3.2 METAFILE DESCRIPTION.................................................................................................................128

7.3.3 VDC TYPE ..........................................................................................................................................128

7.3.4 INTEGER PRECISION .......................................................................................................................129

7.3.5 REAL PRECISION..............................................................................................................................129

7.3.6 INDEX PRECISION ............................................................................................................................129

7.3.7 COLOUR PRECISION........................................................................................................................129

7.3.8 COLOUR INDEX PRECISION............................................................................................................130

7.3.9 MAXIMUM COLOUR INDEX..............................................................................................................130

7.3.10 COLOUR VALUE EXTENT ................................................................................................................130

7.3.11 METAFILE ELEMENT LIST ...............................................................................................................131

7.3.12 METAFILE DEFAULTS REPLACEMENT .........................................................................................132

7.3.13 FONT LIST..........................................................................................................................................132

7.3.14 CHARACTER SET LIST.....................................................................................................................133

7.3.15 CHARACTER CODING ANNOUNCER .............................................................................................133

7.3.16 NAME PRECISION.............................................................................................................................134

7.3.17 MAXIMUM VDC EXTENT...................................................................................................................135

7.3.18 SEGMENT PRIORITY EXTENT .........................................................................................................135

7.3.19 COLOUR MODEL...............................................................................................................................135

7.3.20 COLOUR CALIBRATION...................................................................................................................136

7.3.21 FONT PROPERTIES ..........................................................................................................................138

7.3.22 GLYPH MAPPING ..............................................................................................................................140

7.3.23 SYMBOL LIBRARY LIST...................................................................................................................142

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© ISO/IEC
ISO/IEC 8632-1:1999(E)

7.3.24 PICTURE DIRECTORY ......................................................................................................................142

7.4 Picture descriptor elements.............................................................................................................142

7.4.1 SCALING MODE ................................................................................................................................142

7.4.2 COLOUR SELECTION MODE ...........................................................................................................143

7.4.3 LINE WIDTH SPECIFICATION MODE...............................................................................................143

7.4.4 MARKER SIZE SPECIFICATION MODE...........................................................................................144

7.4.5 EDGE WIDTH SPECIFICATION MODE.............................................................................................144

7.4.6 VDC EXTENT......................................................................................................................................145

7.4.7 BACKGROUND COLOUR .................................................................................................................145

7.4.8 DEVICE VIEWPORT...........................................................................................................................146

7.4.9 DEVICE VIEWPORT SPECIFICATION MODE..................................................................................146

7.4.10 DEVICE VIEWPORT MAPPING.........................................................................................................147

7.4.11 LINE REPRESENTATION..................................................................................................................147

7.4.12 MARKER REPRESENTATION ..........................................................................................................148

7.4.13 TEXT REPRESENTATION.................................................................................................................148

7.4.14 FILL REPRESENTATION ..................................................................................................................149

7.4.15 EDGE REPRESENTATION................................................................................................................149

7.4.16 INTERIOR STYLE SPECIFICATION MODE......................................................................................150

7.4.17 LINE AND EDGE TYPE DEFINITION ................................................................................................150

7.4.18 HATCH STYLE DEFINITION..............................................................................................................151

7.4.19 GEOMETRIC PATTERN DEFINITION...............................................................................................152

7.4.20 APPLICATION STRUCTURE DIRECTORY ......................................................................................152

7.5 Control elements...............................................................................................................................153

7.5.1 VDC INTEGER PRECISION...............................................................................................................153

7.5.2 VDC REAL PRECISION .....................................................................................................................153

7.5.3 AUXILIARY COLOUR ........................................................................................................................153

7.5.4 TRANSPARENCY ..............................................................................................................................154

7.5.5 CLIP RECTANGLE.............................................................................................................................154

7.5.6 CLIP INDICATOR ...............................................................................................................................155

7.5.7 LINE CLIPPING MODE ......................................................................................................................155

7.5.8 MARKER CLIPPING MODE...............................................................................................................155

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7.5.9 EDGE CLIPPING MODE ....................................................................................................................156

7.5.10 NEW REGION.....................................................................................................................................156

7.5.11 SAVE PRIMITIVE CONTEXT .............................................................................................................156

7.5.12 RESTORE PRIMITIVE CONTEXT .....................................................................................................157

7.5.13 PROTECTION REGION INDICATOR ................................................................................................158

7.5.14 GENERALIZED TEXT PATH MODE .................................................................................................158

7.5.15 MITRE LIMIT.......................................................................................................................................158

7.5.16 TRANSPARENT CELL COLOUR......................................................................................................159

7.6 Graphical primitive elements...........................................................................................................159

7.6.1 POLYLINE ..........................................................................................................................................159

7.6.2 DISJOINT POLYLINE.........................................................................................................................159

7.6.3 POLYMARKER...................................................................................................................................160

7.6.4 TEXT ...................................................................................................................................................160

7.6.5 RESTRICTED TEXT...........................................................................................................................161

7.6.6 APPEND TEXT ...................................................................................................................................162

7.6.7 POLYGON ..........................................................................................................................................163

7.6.8 POLYGON SET ..................................................................................................................................164

7.6.9 CELL ARRAY .....................................................................................................................................166

7.6.10 GENERALIZED DRAWING PRIMITIVE (GDP) .................................................................................168

7.6.11 RECTANGLE......................................................................................................................................168

7.6.12 CIRCLE...............................................................................................................................................168

7.6.13 CIRCULAR ARC 3 POINT..................................................................................................................169

7.6.14 CIRCULAR ARC 3 POINT CLOSE ....................................................................................................169

7.6.15 CIRCULAR ARC CENTRE.................................................................................................................172

7.6.16 CIRCULAR ARC CENTRE CLOSE ...................................................................................................172

7.6.17 ELLIPSE .............................................................................................................................................173

7.6.18 ELLIPTICAL ARC...............................................................................................................................173

7.6.19 ELLIPTICAL ARC CLOSE .................................................................................................................174

7.6.20 CIRCULAR ARC CENTRE REVERSED............................................................................................175

7.6.21 CONNECTING EDGE.........................................................................................................................176

7.6.22 HYPERBOLIC ARC............................................................................................................................176

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7.6.23 PARABOLIC ARC ..............................................................................................................................177

7.6.24 NON-UNIFORM B-SPLINE ................................................................................................................177

7.6.25 NON-UNIFORM RATIONAL B-SPLINE.......................................................

...

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