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Item Scan Converting Extruded Lines at Ultra High Definition(Blackwell Publishing Ltd and the Eurographics Association, 1987) Willis, Philip; Watters, GeoffWe consider the problem of generating freehand raster graphics pictures at ultra high definition (typically one gigapixel per picture) by scan converting extruded lines. We describe a fast scan conversion algorithm which is linear in final resolution and which incorporates a number of features to ensure high efficiency. Sample pictures and corresponding performance figures are included.Item UltraPaint: A New Approach to a Painting System(Blackwell Publishing Ltd and the Eurographics Association, 1987) Watters, Geoff; Willis, PhilipThe ideas underlying a Painting System being developed at the University of Bath are introduced. This differs from a conventional system in that ultra high definition pictures of upto 1 gigabyte may be created. We discuss approaches to implementing a number of standard paint program utilities in a form suited to our high definition method. Finally, we describe an algorithm for the rapid extrusion of brush strokes on a raster device.Item Graphical Interaction Management(Blackwell Publishing Ltd and the Eurographics Association, 1987) Barn, Balbir S.; Willis, PhilipGraphical interfaces and interactive graphical programmes are awkward to write because of a lack of top-down structure. A methodology for constructing graphical programs will be described, together with a system that generates the basic interaction requirements for such applications.Item Browsing High Definition Colour Pictures(Blackwell Publishing Ltd and the Eurographics Association, 1985) Willis, Philip; Milford, DavidThe authors describe a method of presenting colour pictures which allows users to browse by panning and zooming. The pictures are seen as though on a 512 by 512 by 12 bit framestore, but are defined to 4096 by 4096. The implementation allows the entire picture to be seen in overview, with fine details averaged, or to be zoomed in upon with finer detail progressively revealed by a sequence of twofold linear magnifications. Further zooming, beyond the resolution of the picture data, automatically produces a conventional pixel replication effect. In addition, the picture may be panned vertically or horizontally.