By Ian O. Angell, Brian J. Jones
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Furthermore new designs are always in demand: geometrical art is used for the covers of books and pamphlets and in advertising literature. It can do no harm at all to initiate artistic ideas that will be of great use later when we study the pictorial display of data. Patterns are also an ideal way of introducing some of the basic concepts of computer graphics in a very palatable way. Take the next two examples, which use our simple library of procedures, and look at the important role of trigonometric functions (sine and cosine) and of angular measurement in radians.
FOR 1%=1 TO 6 : SOUND1,I%-15,2(,J+I%*6,1: NEXT 1% SCORE=SCORE+1 : PROCstatus REM if worm is 55 segments long you have eaten '18, you win S=5+5 : IF S=55 THEN WON=TRUE : ENDPROC PROCtarget ENDPROC 6888 6889 6818 682(,J 6838 684(1 685(,J 6868 REM status REM show score and no. of worms DEF PROCstatus COLOUR 128+3 : COLOUR (,J IF SCORE>HSC THEN HSC=SCORE PRINT TAB(l,l)i" SCORE "iSCORE," HI "iHSC PRINT TABCl,38)i" LEVEL "iLEVEL,"WORMS "iWORMS ENDPROC 7888 7818 7819 7828 REM target DEF PROCtarget REM produce random1@positioned target, not inside worm.
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Advanced Graphics with the BBC Model B Microcomputer by Ian O. Angell, Brian J. Jones