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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.