By Ian O. Angell, Brian J. Jones
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Extra resources for Advanced Graphics with the Acorn Electron
Of worms. DEF PROCstatus COLOUR 128+3 : COLOUR S IF SCORE>HSC THEN HSC=SCORE PRINT TAB(l,l);" SCORE ";SCORE," HI ";HSC PRINT TAB(1,38);" LEVEL ";LEVEL,"WORMS ";WORMS ENDPROC 7666 7818 7819 782S 7838 764S REM target DEF PROCtarget REM produce randomly positioned target, not inside worm. ) using low-resolution colour graphics. 13. You may find it useful to turn some of the program sections from this chapter into procedures, which is readily done if you approach program writing in a prepared modular manner.
3 - dark circles that radiate out from the centre of the pattern. The study of optical illusions is fascinating (see Tolansky, 1964) and it is a never-ending fount of ideas for patterns. This exercise was introduced because it leads the way into the general technique for drawing curves -- see chapters 3 and 6. 4 An extension of this idea, the natural next step, is the construction of a spiral. Again the general form of the curve about the origin is (Rcos ex, Rsin ex) but now ex varies between angles ~ and ~ + 2 N1T, where ~ (the parameter BETA) is the initial angle that the normal to the spiral makes with the positive x-axis, and N is the number of turns in the spiral.
The reader will now be taken some way towards generating a two-dimensional and three-dimensional graphics package for the Electron: the programs are given in BASIC and rely (with a few exceptions) on the small number of primitive procedures that are given in this chapter. 24 From Real Coordinates to Pixels 25 Primitives that Map Continuous Space on to the Graphics Frame In general, computer graphics deals with points, lines, areas and volumes in continuous two-dimensional and three-dimensional Euclidean space.