STD.IS0 7942-2-ENGL 1997 48519030717736568 INTERNATIONAL ISO/IEC STANDARD 7942-2 First edition 1997-09-01 Information technology -- Computer graphics and image processing Graphical Kernel System (GKS) Part 2: NDC metafile Technologies de I'information -- Infographie et traitement d'image - Systeme graphique Kernel (GKS) -- Partie 2: Métafichier NDC This material is reproduced from Iso documents under International Organization for Standardization (Iso) Copyright License number iHS/iCCii996.Notforresale.Nopartoftheseisodocumentsmaybe reproduced in any form, electronic retrieval system or otherwise, except as consent of isO (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHs or the Is0 Licensor's members. IEC fso Reference number ISO/IEC 7942-2:1997(E) COPYRIGHT International Organization for Standardization Licensed by Information HandlingService STD.IS0 7942-2-ENGL 199? 4851903 0717737 4T4 ISO/IEC 7942-2:1997(E) Contents Foreword.. Introduction. vi 2 Normative references. 3 Definitions..... 4 Concepts.. 4.1 The structure of a GKS-94 NDC metafile 4..2Metafileelements................ 4.3Delimiter elements.. 4.4 Metafile descriptor elements. 4.4.1Elements used 4.4.2 Functional capability 4.4.3NDC-SET 4.5 Control elements . 4.6 Graphical primitive elements.. 4.7Attributeelements. 4.8 Application structure elements .. 5 Abstract specification of new elements.. 11 5.1 Data type definitions and abbreviations. 11 5.2 Delimiter elements.. 5.3 Metafile descriptor elements.. 11 5.4 Control elements ..... 11 5.5 Graphical primitive elements. .12 5.6 Attribute elements ... 5.7Metafile defaults .. 6 Mapping from NDC picture to NDC metafile ... 14 6.2 Output primitives . . .14 6.2.1 SET OF POLYLINE 14 6.2.2SETOFNURB.. 14 6.2.3 SET OF CONIC SECTION 14 6.2.4 POLYMARKER. ISO/IEC1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or film, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 Switzerland Printed in Switzerland ii COPYRIGHT, International Organization for Standardization LicensedbyInformationHandlingServices 7942-2-ENGL 1997 STD.ISO 48519030717738330 @ ISO/IEC ISO/IEC 7942-2:1997(E) 6.2.5 SET OF FILL AREA.. 15 6.2.6 SET OF ELLIPTIC SECTOR 15 6.2.7 SET OF ELLIPTIC SEGMENT. 15 6.2.8 SET OF ELLIPTIC DISC. .16 6.2.9SETOFCLOSEDNURB .16 6.2.10TEXT 16 .11 CELL ARRAY .... 6.2.12 DESIGN PRIMITIVE 6.2.13GENERALIZEDDRAWINGPRIMITIVE 18 6.3 Output attributes... 6.3.1 SCISSOR SET... 18 6.3.2 TEXT UP VECTOR and TEXT SKEW ANGLE 6.3.3 CHARACTER FONT AND PRECISION .... 1g 6.3.4 COLOUR SPECIFIER .19 7 The Character Encoding of the GKS-94 NDC Metafile. 21 7.1 Notational conventions.. .21 7.2 Method of encoding opcodes... 7.2.1 Introduction .. .21 7.2.2 Opcode assignments . .21 7.3 Method of encoding parameters .22 7.4 Representation of new elements.. 7.4.1 Introduction . .22 7.4.2 Delimiter elements... 7.4.3 Metafile descriptor elements.. .22 7.4.4 Control elements.... .22 7.4.5Graphicalprimitiveelement 7.4.6 Attribute elements... ..24 7.7 Application structure elements.... 8 The Binary Encoding of the GKS-94 NDC Metafile .27 8.1 Overall structure .. .27 8.3 Representation of abstract parameter types. .27 8.4 Representation of each element. .27 8.4.1 Introduction .. .27 8.4.2 Delimiter elements. 8.3 Metafile descriptor elements... 8.4.4 Control elements ... ..28 8.4.5 Graphical primitive elements. .28 8.4.6 Attribute elements....... ..29 8.4.7 Structure attribute elements.. ..30 9 The Clear Text Encoding of the GKS-94 NDC Metafile 9.1 Notational conventions.. .32 9.2Encodingparameter types 9.3 Forming names... 9.3.1 Introduction . ..32 9.3.2 Words deleted .32 9.3.3 Words used unabbreviated ..32 9.3.4 Abbreviations... 9.3.5 The derived names of new elements ..33 ili COPYRIGHT International Organization for Standardization Licensed by Information Handling Servic