29 results
Search Results
Now showing 1 - 10 of 29
Item GRAPHICAL PRESENTATION FOR DATA ANALYSIS IN PARTICLE PHYSlCS EXPERIMENTS : THE HBOOK / HPLOT PACKAGE(The Eurographics Association, 1980) Brun, R.; Palazzi, P.; C. E. VandoniHBOOK is a subroutine package to handle statistical distributions (histograms and scatter plots) in a FORTRAN scientific computation environment. It presents results graphically on the line printer, and can optionally draw them on graphic output devices via the HPLOT subpackage.Item SGL - A GENERAL PURPOSE INTERACTIVE SYSTEM BUILT ON TOP OF A GKS IMPLEMENTATION(The Eurographics Association, 1980) Cunha, J.D.; C. E. VandoniThis paper presents the description of an interactive graphics system built on top of a GKS level 4 implementation. The system architecture is based on the notion of Process and the mainemphasis has been devoted to design a powerful "core", conceived as an extension of the operating system, around which different application programs can be developped with a minimum of effort.Item TRIAL-AND-ERROR APPLICATIONS FOR INTERACTIVE DATA REPRESENTATION(The Eurographics Association, 1980) Vincents, Bo; C. E. VandoniThis paper examines the advantages available to planners and experimental theorists of using computers to visualise their theories by generating a multiplicity of graphs interactively. The paper focuses on statistical applications, simulation and differential equation analysis. Examples show how interactive graphing systems can ease the use of complex models by immediately displaying the consequences of trial-and-error assumptions, and by revealing useful interrelationships not predicted by the theory. The paper concludes that applications exist for computer generated graphs in areas where previously hand-drawn graphs have not been practical, such as simulation, regression, estimation and forecasting.Item Easy to Use Graph Drawing Procedures in ALGOL 68(The Eurographics Association, 1980) Butland, S. D.; Butland, J.; Vandoni, C. E.An ALGOL68 implementation of a comprehensive set of graph drawing procedures is described. The procedures are designed to enable scientists and engineers writing programs in ALGOL68 to produce a wide range of graphs with little programming effort. The ALGOL68 implementation of the package is compared with the FORTRAN versions and is found to be simpler to use. A description is given of the implementation of the package on a CDC 7600 machine. The package is built on the original FORTRAN subroutines which provide well tested error-free graph drawing software. The programmer, however, only needs to be aware of the much simpler interface provided by ALGOL68.Item A CAD - SYSTEM FOR INTERACTIVE GRAPHICAL HANDLING OF HIERARCHICAL BLOCK DIAGRAM INFORMATION(The Eurographics Association, 1980) Leinemann, Klaus; C. E. VandoniThe CAD - system named GRIMBI is designed to support the functional modelling of large engineering systems. GRIMBI includes a data definition facility, to define model classes functionally and graphically. The data manipulation facility allows for structured modelling by stepwise refinement or abstraction according to known block diagram techniques. Besides batch modelling, GRIMBI supports interactive design by delegating graphic and communication tasks to an intelligent graphic terminal. GRIMBI checks the designer input for validity and completeness.Item APPLICATIONS OF AN INTERACTIVE VECTOR GRAPHICS SYSTEM TO CHEMISTRY(The Eurographics Association, 1980) WEBER, J.; BERNARDINELLI, G.; COMBREMONT, J.J.; ROCH, M.; C. E. VandoniThis paper describes several applications to chemistry of a computer graphics equipment based on a mini-computer and an interactive vector graphics system. After a presentation of the hardware and software available, the following application programs are described and illustrated: (i) 3D visualization of molecular systems, with possible use of a windowing procedure for enlarging part of the structure; (ii) representation of dynamic processes in molecules; (iii) visualization of molecular properties derived from quantum chemical calculations. These applications, which fully exploit the potentialities of the relatively sophisticated equipment, have been developed in order to provide an adequate audio-visual support for teaching chemistry.Item OPTIMIZED SOFTWARE DISTRIBUTION IN SATELLITE GRAPHICS SYSTEMS(The Eurographics Association, 1980) Cullmann, Norbert; C. E. VandoniInteractive computer graphics requires satellite systems. The two software techniques used today with these systems ('fixed-function' and 'programmable satellite') showed to be unsatisfactory. This paper points out refined techniques which are intended to facilitate the programming of a satellite system and to increase its utilization. For this purpose, an optimization is used which delivers the distribution of an application program depending on the host load. Thus, automatic interprocess communication enables a loaddependent floating distribution. This system should also be useful for the distribution of graphical system software like GKS (Graphical Kernel System).Item IMAGE MODELING ASPECTS OF NON-PROCEDURAL PARALLEL PROCESSING LANGUAGE(The Eurographics Association, 1980) Enornoto, Hajime; Yonezaki, Naoki; Miyamura, Isao; C. E. VandoniFundamental framework of image data modeling for image description and related high level non-procedural language are presented, Structure lines are introduced as invariant features of image to describe structure of images. To specify such structured features and processes to obtain them, we give general principles for non-procedural specification, that is. separation of definition and control. A non-procedural parallel processing language employing this principle is also introduced with examples.Item GEOGRAPHIC INFORMATION SYSTEMS AND THE ODYSSEY PROJECT(The Eurographics Association, 1980) Teicholz, E.; Nisen, B.; C. E. VandoniThere are numerous public and private agencies that are currently creating geographic (location specific) data. These agencies include the Census Bureau (County DIME, Urban Atlas, DIME files), the United States Geological Survey (Land Use Series), the Central Intelligence Agency (World Data Banks I and II), NASA (LANDSAT), the Soil Conservation Service (soil surveys) and others. In addition, there are an increasing number of commerical service bureaus offering geographically referenced data. A major problem facing planners, resource analysts, marketing analysts, mathematical geographers and others is the ability to combine these different coverages into a common data base (population, land use, sales areas, zoning districts, etc.), and the ability to comparethese irregular coverages by means of the analytical process of polygon overlay in order to create a composite coverage. This latter task would give the analyst the ability to display a map of, for example, employed persons between the ages of 40 and 50, paying between $2000 and $3000 in real estate taxes and aggregated to congressional districts. The ODYSSEY project of the Harvard Geographic Information System was designed to respond to these problems. ODYSSEY is an open-ended series of program modules that interactively create, manipulate, edit and display geographic data. More specifically, the ODYSSEY programs create data bases by integrating data from a variety of sources, enabling the manipulation of a data base (along with its associated attributes), performing analytic tasks on the data, such as polygon overlay, and displaying the results as colored or black and white thematic maps.Item C. G .A. L.(The Eurographics Association, 1980) Comninos, Peter; Webster, Graeme; C. E. VandoniC.G.A.L. stands for Computer Graphics and Animation Language, and as its name implies, it is a computer language especially designed to help the user produce still and animated pictures with a Digital Computer. The major design objective of this language was to allow non-programmers to communicate with the computer and to instruct it to produce Graphic Output for them.