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

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Extra resources for Advanced Graphics with the B. B. C. Model B Microcomputer

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15. No data required. 16. No data required. 2 From Real Coordinates to Pixels Throughout the two-dimensional and three-dimensional sections of this book we shall divide the television screen into a text window (of two lines at the top of the screen) and a graphics window (the rest of the screen). As already discussed, on the Model B the graphics window (or graphics frame) consists of a rectangular matrix of coloured pixels; the size and number of the pixels and the number of possible colours depend on the MODE setting of the computer (0 to 7).

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. 2 From Real Coordinates to Pixels Throughout the two-dimensional and three-dimensional sections of this book we shall divide the television screen into a text window (of two lines at the top of the screen) and a graphics window (the rest of the screen).

From now on we shall omit the (P) from the point vector. 1. At first sight it looks complicated, but on closer inspection it is seen to be simply a square, outside a square, outside a square etc. The squares are getting successively smaller and they are rotating through a constant angle. In order to draw the diagram we need a technique that, when given a general square, draws a smaller internal square rotated through this fixed angle. 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).

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