By Smeds B.
A brand new plotter for demanding reproduction color reveal of electronic desktop outputs hasbeen constructed. The plotter makes use of 3 depth modulated ink jets with thecolours crimson, yellow and blue, which plot the knowledge on a typical A four paper(210 × 297 mm) fixed to a rotating drum. The ink jets are separately controlledfrom a magnetic tape unit that is loaded with a tape ready via thecomputer. the complete plotting time is eighty five seconds self sufficient of the complexityof the image t~ be plotted. the entire details contents plotted in a single 85second run is bits.
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Extra info for A 3-Colour Ink Jet Plotter for Computer Ggaphics
Section 5 applies our theory to specify red-black trees. Section 6 discusses related work. Section 7 concludes. Proofs are omitted from this paper, they are given in the full technical report . 2 Graph Reduction Specifications This section describes our framework for specifying graph languages by reduction systems. We define graphs, rules and derivations as in the double-pushout approach , and add a signature restriction to ensure that graphs are models of data structures and that rules preserve the restriction.
Example Actions changeIt and put described in collaborations in Figures 5 and 6 are translated to rules in Figures 8 and 9. The rule name and parameter list correspond to those of the corresponding method. Rule put produces new revisions of the item list and the cart. The resulting item list contains all previous items with the new one in addition. The previous items are depicted by a multi- 24 Anilda Qemali and Gabriele Taentzer Fig. 8. Rule changeIt(in i:Item, s:Int, c:Enum) object which is mapped to all item vertices connected to the current list vertex when the rule is applied.
Example 2 (Specification of cyclic lists) Fig. 2 gives rules defining cyclic lists. A single loop, is a cyclic list and all other cyclic lists reduce to Two-link cycles are reduced by TwoLoop. Longer cycles are reduced a link at a time by Unlink. Clearly a graph of several disjoint cycles will not reduce to a single loop; no rules reduce branching or merging structures, and acyclic chains cannot become loops. The rest of this paper is organised as follows. Section 2 defines GRSs. Section 3 discusses polynomial GRSs (PGRSs) and their complexity for shape checking.