DSpace Repository :: Browsing Issue 4 by Issue Date

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(Blackwell Publishing Ltd and the Eurographics Association, 1985)

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Moving Picture Synthesis at Linkoping University

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Fahlander, Olov

We believe that in the future we will see a diverse variety of applications in the now emerging technology of real time computer animation. Such animations impose stringent computational and bandwidth demands on the underlying system. It is important to investigate carefully the methods best suited to the particular requirements of animation when motion is involved.1,2,3 In this paper we describe a system - Retina - which is now operational. We discuss the underlying concept of parameterization, which is of fundamental importance to the software design. Some timing data for this system will be given. A short description of the 3D editor, which is currently under development, is also given.

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Report of the Timberline Meeting of ISO TC97/SC21/WG2 "Computer Graphics"

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Bono, Peter R.

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EUROGRAPHICS-85 Best Paper Award

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Vandoni, C E

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Proposed Revisions to the EUROGRAPHICS UK Chapter Constitution

(Blackwell Publishing Ltd and the Eurographics Association, 1985)

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Implementations using GKS Pascal Binding Appeal for Information

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Sparks, Madeleine; Gallop, Julian

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Computer Animation and Art Slide Competition

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Rambert, Patrick

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Micro-based CAD: A Production Tool for Manufacturing Engineering

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Goldman, Gary S.

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Better Understanding through Formal Specification

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Duce, D. A.; Fielding, E. V. C.

The Graphical Kernel System (GKS) is now registered as an ISO International Standard for computer graphics programming. One of the major innovations of the Standard is the bundled specification of aspects, a mechanism which gives the applications programmer the ability to tailor the appearance of a picture independently on each of the workstations on which it is displayed, using the capabilities of the workstations. GKS also incorporates the traditional method of individual specification of aspects in which each workstation does the best it can to represent global aspect values. In this paper a formal specification technique, the Vienna Development Method (VDM), is used to describe aspect specification. The GKS model of aspect specification is progressively constructed from simpler models. Properties of these simpler models are formulated and the specifications are proved to conform to these. The properties are then traced through the more complex models. The paper demonstrates the applicability of formal specification to the design of graphics software and the ability of formal techniques to catalyse the deeper understanding of designs.

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GKS Programming in a PHIGS Environment

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Arnold, David B.; Hall, Gillian; Reynolds, Graham J.

GKS is an international standard for the functional interface to 2D graphics, whilst PHIGS is currently an ISO work item for 2D and 3D graphics. In addition, PHIGS allows improved control over structuring graphics data in the system. With a new work item, the upwards compatability from GKS to PHIGS is being called into question. This paper is an attempt to give direction to these discussions by listing the implications of introducing a software layer between a GKS application program and a PHIGS environment on which this application is to be run. It is intended to highlight differences between the systems and to answer questions such as, "How compatible?", "Is it possible?", "How much does the software layer have to do?", etc.

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Polygonal Clipping of Polylines

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Matthew, A.J.

A Fortran routine is presented for clipping a polyline to the inside or outside of a polygon, the boundary of the polygon being treated as part of the inside. There is no limitation on the number of sides of the polygon or vectors of the polyline, and no working storage is required. The polygon may have sides that intersect and vertices or sides that coincide with each other.

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Arbitrary Area Filling in a Fast Procedure

(Blackwell Publishing Ltd and the Eurographics Association, 1985) Ying, Dao-Ning; Feng, Xing

A representation for area filling is described which allows shading of an area that may have both straight lines and circular arc edges and include holes within its boundaries. For efficiency an elimination algorithm which has a waiting line list and a currently active line list is adopted. For calculating intersections, a more time saving method is used. The algorithm and some practical examples are discussed. The main features of the algorithm are execution with high speed and less storage requirement. The program is written both in BASIC and FORTRAN 77 and could be executed on a microcomputer such as APPLE II, IBM-P/C etc. The sample outputs shown in this paper are generated by the APPLE II with high efficiency.