ISO/IEC INTERNATIONAL 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 et de transfert des informations de description d'images Partie 1: Description fonctionnelle Reference number ISO/IEC 8632-1:1999(E) IEC iso @ISO/IEC 1999 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 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/IEC1999 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 [email protected] Web www.iso.ch Printed in Switzerland ii @ ISO/IEC 1999 - All rights reserved @ ISO/IEC ISO/IEC 8632-1:1999(E) Contents Page Scope.. 2 Conformance 3 Normative references 4 Terms and definitions.. 4.1 Definitions. 5 Symbols and abbreviated terms... 11 6 Concepts .. 6.1 Introduction 12 6.2 Delimiter elements 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 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 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...... 6.5 Control elements. 27 6.5.1 VDC space and range . ili @ 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.... 6.6.3 Text elements 6.6.4 Filled-area elements.. 6.6.5 Cell elements . .39 6.6.6 Circular arc elements. 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 .. .2. 6.7.3 Textattributes ..64 6.7.4 Filled-area attributes ..87 6.7.5 Specification modes and transformation of aspects . ...90 6.7.6 Colour attributes 6.7.7 Pick identifier. ..93 6.7.8 Compound text path ... 6.7.9 Symbol Attributes .93 6.8 Escape elements. 6.9 External elements .95 iv @ 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.... 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