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

By Ian O. Angell, Brian J. Jones

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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).

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.

6. No data required. 7. Use the cursor keys to move the red point about the screen. Type 'p' to leave a trail, and 's' if no trail is wanted. 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.

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