VolksForth/sources/AtariST/DRAGON1.FB.src

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2020-06-20 16:59:55 +00:00
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0 \\ documentation for dargon demo tcas20130106
1 start the dragon with : <pos int> DRAG
2 or with : <1 or -1> <pos int> DRAGON
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4 DRAG clears the screen, defines the starting point and executes
5 DRAGON.
6 The variable STEPSIZE defines the size of steps between 1 and 3
7 (larger values will produce grabage)
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9 odd numbers as input values do not work
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11 DDEMO is a loop executing the DRAGON demo which can be stopped
12 with a keypress once the 2nd dragon is fully painted (it is
13 recommended to press a key a little in advance)
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0 \ dragon-loadscreen cas20130106
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2 Onlyforth
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4 \needs Graphics include line_a.fb
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6 Onlyforth GEM also Graphics also
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8 decimal
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10 1 5 +thru
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0 \ dragon s.2 03oct86we
1
2 Variable angle
3 Variable stepsize 1 stepsize !
4 Variable color 1 color !
5 Variable xcood Variable ycood
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0 \ set_pixel 03oct86we
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2 Label ?step
3 stepsize pcrel) D2 move D1 tst 0<> IF D2 neg THEN rts
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5 Code set_pixel
6 xcood pcrel) D3 move ycood pcrel) D4 move
7 angle pcrel) D0 move 1 # D0 asr D0 D1 move 1 D0 andi
8 1 # D1 asr 1 D1 andi
9 D0 tst 0= IF ?step bsr D2 D3 add D3 xcood R#) move THEN
10 D0 tst 0<> IF ?step bsr D2 D4 add D4 ycood R#) move THEN
11 D3 SP -) move D4 SP -) move color pcrel) SP -) move
12 ;c: put_pixel ;
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0 \ dragon s.3 03oct86we
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2 Code turn ( n -- )
3 angle pcrel) D0 move SP )+ D0 add D0 angle R#) move
4 Next end-code
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6 : dragon recursive ( stepw rec_tiefe -- )
7 dup 0= IF 2drop set_pixel
8 ELSE
9 over turn
10 1 over 1- dragon
11 over 2* negate turn
12 -1 over 1- dragon
13 drop turn
14 THEN ;
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0 \ dragon s.4 03oct86we
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2 : drachen
3 2 stepsize !
4 100 xcood ! 200 ycood ! 1 14 dragon
5 101 xcood ! 200 ycood ! 1 14 dragon
6 100 xcood ! 201 ycood ! 1 14 dragon
7 101 xcood ! 201 ycood ! 1 14 dragon
8 1 stepsize ! ;
9
10 : schubs
11 100 0 DO I 112 over - 400 272 2over >r 1+ r> 1-
12 scr>scr LOOP ;
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0 \ dragon s.5 03oct86we
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2 : drag ( n -- ) page
3 angle off 100 xcood ! 200 ycood !
4 1 swap dragon ;
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6 : ddemo
7 16 drag schubs
8 0 color ! 199 xcood ! 100 ycood ! 1 16 dragon
9 1 color ! drachen ;
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0 \ 03oct86we
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