Read e-book online Computer Graphics: Techniques and Applications PDF

By Samuel M. Matsa (auth.), R. D. Parslow, R. W. Prowse, R. Elliot Green (eds.)

ISBN-10: 1475713207

ISBN-13: 9781475713206

ISBN-10: 1475713223

ISBN-13: 9781475713220

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In this case, the question of which approach is best may hinge on the amount of data which is common to all displays and the desired degree of flexibility within each display. In conclusion, if there are a large number of displays, each with their own memory, category selection by the computer is the best approach. Harry H. Poole 48 If there are a number of displays sharing the same memory, the decision would be based on how much data was common between the displays and what was the maximum size of the data base.

TGf------1( Exit. ) Note pen position (X2. ) Fig. 7 the lightpen can "see" a line, and, if it can, the gravity field routine need only be performed on the end-points of that particular line. Gravity fields can be applied to other than lines, for example arcs, ellipses, or even complex subpictures representing transistors or pipe valves. Also, by straightforward co-ordinate geometry, gravity fields can be made much more complicated, in order to put the cross not only on end-points but also along the lines, on intersections, and so on.

3) Limitations on the flexibility of the display. Computers which have sufficient capability to provide refresh for a display have direct 1/0 access to computer memory as well as the capability for simultaneous 1/0, and have central processor memory operation through an access bus arrangement and modular memory system. Data being transferred to the display in systems of this type must come from the computer memory, whether for refresh purposes or for updating a memory located in the display. Whenever this data transfer delays an internal operation, available program operating time is reduced.

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Computer Graphics: Techniques and Applications by Samuel M. Matsa (auth.), R. D. Parslow, R. W. Prowse, R. Elliot Green (eds.)

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