Issue 4
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Item Affiliation Agreement(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item Arbitrary Area Filling in a Fast Procedure(Blackwell Publishing Ltd and the Eurographics Association, 1985) Ying, Dao-Ning; Feng, XingA 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.Item 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.Item Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item Computer Animation and Art Slide Competition(Blackwell Publishing Ltd and the Eurographics Association, 1985) Rambert, PatrickItem CORRIGENDA(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item CORRIGENDA(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item An Edge-Face Relational Scheme for Boundary Representations(Blackwell Publishing Ltd and the Eurographics Association, 1985) Ansaldi, S.; De Floriani, K.; Falcidienc, B.We propose a relational scheme for representing and modelling regular objects, which is based on the adjacency relations between faces and edges. In this structure, called edge-face graph, the nodes represent the faces and the arcs the edges of the corresponding object. Other topological entities, such as vertices, loops of edges, and shells, can be obtained from this relational scheme. We give a formal description of the edge-face graph, and the relationships between its properties and the topological entities of the object are analyzed in detail. Furthermore, a set of basic Euler operators based on the edge-face adjacency relation is denned, which allow the incremental manipulation of boundary representations of solid objects.Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item EUROGRAPHICS 86 TUTORIALS: August 25-26 1986(Blackwell Publishing Ltd and the Eurographics Association, 1985) Hopgood, BobItem EUROGRAPHICS General Assembly(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item EUROGRAPHICS-85(Blackwell Publishing Ltd and the Eurographics Association, 1985) Greenaway, D SItem EUROGRAPHICS-85 Best Paper Award(Blackwell Publishing Ltd and the Eurographics Association, 1985) Vandoni, C EItem 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.Item GKS Slide Sets(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item Graphics Language Bindings - The what and why(Blackwell Publishing Ltd and the Eurographics Association, 1985) Sparks, MadelineItem Implementations using GKS Pascal Binding Appeal for Information(Blackwell Publishing Ltd and the Eurographics Association, 1985) Sparks, Madeleine; Gallop, JulianItem Institutional Membership(Blackwell Publishing Ltd and the Eurographics Association, 1985)Item An Interpolant with Tension Defined over Triangles(Blackwell Publishing Ltd and the Eurographics Association, 1985) de Floriani, Leila; Dettori, GiulianaA C1 interpolation scheme is described, which is defined over triangular grids. The interpolant is computed on the basis of curves with tension, which permit local control over the shape of the resulting surface.Item Letter to the Editors(Blackwell Publishing Ltd and the Eurographics Association, 1985) Hunt, Carolyn R.