ISO/EC INTERNATIONAL STANDARD 11072 First edition 1992-10-01 Information technology -- Computer graphics - Computer Graphics Reference Model Technologies de I'information - Infographie - Modele de reference Reference number ISO/IEC 11072:1992 (E) Copyright International Organization for Standardization rking permitted without license from IHS Not for Resale ISO/IEC 11072:1992 (E) Contents Page Foreword iv v Introduction 1２7- Scope 2 Definitions The Computer Graphics Reference Model 3 Environment model 3.1 3.2 External relationships Environment structure 3.3 11 3.4 Data elements 11 3.4.1 Introduction 11 3.4.2 Composition 11 3.4.3 Collection store 11 3.4.4 Token store 12 3.4.5 Aggregation store 12 3.4.6 Environment state 12 3.5 Processing elements 12 3.5.1 Absorption 13 3.5.2 Manipulation 13 3.5.3 Distribution 13 3.5.4 Assembly 13 3.5.5 Emanation 14 3.6 Characteristics of specific environments 14 3.6.1 Environment details 16 3.6.2 Output primitives 16 3.6.3 Input tokens Properties 17 3.6.4 18 3.6.5 Transformations 18 3.6.6 Fan-in and fan-out 20 3.71 Relationship between output and input 21 3 Internal interfaces 3.8 CISO/IEC 1992 All rights reserved. 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 the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland CopyrihenationarganizatirStandardizatio ion or networking permitted without license from IHS Not for Resale ISO/IEC 11072:1992 (E) Annexes Existing standards and the CGRM 22 22 A.1 Graphical kernel system—ISO 7942 22 A.2 Graphical kernel system for three dimensions—ISO8805 A.3 Programmer's hierarchical interactive 24 graphics system — ISO/IEC 9592 24 A.4 Interfacing techniques for dialogues with graphical devices---ISO/IEC 9636 A.5 Metafile for the storage and transfer of 26 picture description information—ISO 8632 27 B The relationship of computer imaging to computer graphics C The relationship of window systems to computer 30 graphics C.1 30 Introduction C.2 Window systems 30 C.3 Windowing considered 30 as an operator C.4 32 Windowing considered as part of the computer graphics system 332 C.4.1 Overview C.4.2 Operations on windows 33442 C.4.3 Operations on window content C.4.4 Displaying windows C.4.5 Input D Bibliography 35 ii Copyright International Organization for Standardization Not for Resale