Download PDF by Ian O. Angell, Brian J. Jones: Advanced Graphics with the BBC Model B Microcomputer

By Ian O. Angell, Brian J. Jones

ISBN-10: 1349067660

ISBN-13: 9781349067664

ISBN-10: 1349067687

ISBN-13: 9781349067688

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Extra info for Advanced Graphics with the BBC Model B Microcomputer

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8. No data required. 9. Data required: Mode? Type the required value between 0 and 6. Do you want to alter colour settings? Type Y(es) or N(o) as appropriate. Alter LOGICAL colour? Type a mode-dependent integer that is defined to be an ACTUAL colour; that is, type an integer between o and 15. 10. 11. 12. 13. 14. No data required. No data required. Data required: two integers Nand ST; try N = 14 and ST = 5. ', 'J', 'K' and 'M' move the worm. No data required. 15. No data required. 16. No data required.

Suppose the general square has four corners {(Xi,Yi) Ii = 1, 2, 3,4} and the ith side of the square is the line joining (Xi,Yi) to (Xi+l'Yi+l) - assuming that additions of subscripts are modulo 4 (that is 4 + 1 == 1). A general point on this side of the square, (x~, y;), is given by «1 -Il) x Xi + Il x Xi+l, (1 Jl) x Yi + IJ x Yi+l) where 0 ~ Jl ~ 1 In fact u: 1 - IJ is the ratio in which the side is bisected. If Il is fixed and the four points {(xi,Yi) Ii = 1,2,3,4 }are calculated in the above manner, then 46 Advanced Graphics with the BBC Model B Microcomputer the sides of the new square make an angle Q = tan-I [/J/(l - /J)J with the corresponding side of the outer square.

Be prepared to scour your local library (or pester your friendly neighbourhood mathematician) for the necessary information. 7 ('triangle') under the heading 'lib1'. 6 ('drawing a square'). No INPUT data required. 8 ('joining points of regular N-gon '). Data required: an integer N ~ 30. 9 ('rose'). Data required: the values of M and N. Use N ~ 30 and for the best results set M < N ~ 15. 10 ('main program' and 'circle'). No data required. 11 ('main program' and 'spiral'). No data required. When the spirals start to rotate you should stare at the screen for 30 seconds.

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Advanced Graphics with the BBC Model B Microcomputer by Ian O. Angell, Brian J. Jones

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