ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00556.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractInteractions between human minds and machine systems will be discussed, drawing on experience of CAD and focusing on modes of expression. Free forms of text and drawings pose deep questions when interpretations have to be “meaningful” to different knowledge representations ‐ especially in loosely defined application fields. What should we expect from techn

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00557.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractIn order to compare the quality of different implementations of GKS, the ISO0 standard for computer graphics, an evaluation method for GKS implementations is presented. It is based upon several groups of criteria. One group of criteria is concerned with performance, by which we understand here the memory requirements and time requirements for programs using GKS functions. A program that measures the performance of GKS packages is presented. Results of this evaluation method with several commercially available GKS implementations are described in summary. A checklist for evaluation of standard graphics packages is added as an appendix.

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00558.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractStereochemistry concepts deal with situations associated with chiral arrangement of atoms in a molecule. The existence of stereocompounds implies different physical properties associated with local and global structural space dissymetry. A left and right hand relationship is a typical local example of such concepts. In this paper, we show how it is possible to include stereochemistry in a comprehensive system allowing for acquisition, storage and retrieval of chemical information. Special emphasis has been placed on the description of the graphic interface on the level of both data acquisition and retrieval. Various graphic coding procedures associated with stereochemical handling are analysed. A specialized input device, optimized for handling of chemical and structural data in bulk, is presented.

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00559.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractA filling algorithm for irregular polygons is described. This algorithm is oriented towards raster graphics and uses image memories as job areas. The algorithm is based on the encoding of polygon boundaries by contour following so that all topologies are successfully processed. Thus, concave or convex polygons, holed or not, including possibly duplicate points can be filled. It is quite robust and easy to implement. It uses systematic encoding without special cases. Only two bits for encoding are needed and, thereby, it is suitable for hardware implementation.This algorithm can be used in many fields such as image synthesis, 3D objects or mathematical surface displays with hidden parts.

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00560.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractThe. architecture of, and a performance estimate for, the dedicated graphics processor ‐ SIGHT, a high‐speed ray tracing machine, are presented. Ray tracing is a vector calculation in 3–dimensional (3–D) space and each ray to be traced can be calculated independently. The SIGHT is designed so that it speeds up the execution of the ray tracing algorithm at two levels of parallel operations: the pixel‐level parallel operation by multiprocessors and the instruction‐level parallel operation by the new processing element (PE) architecture. The features of

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00561.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00562.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00563.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractThe logical input device model, as is adopted in the standardized graphics package GKS, has been an accepted basis for producing device‐independent graphics systems. However, when used in highlyinteractivegraphical applications, the logical input device model does not provide sufficient support for a number of fundamental issues inherent to interaction. This paper reopens a discussion which questions the functionality provided by the logical input device model when brought in conjunction with interaction. In particular, the logical input device model does not support the notion of input/output symmetry.CR Categories: 1.3.4 [Computer graphics]: Graphics utilities‐graphics packages;1.3.6 [Computer graphics]: Methodology and techniques‐device independence, interaction tech

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00564.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1987.tb00565.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY