mirror of
https://github.com/forth-ev/VolksForth.git
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137 lines
8.4 KiB
Forth
137 lines
8.4 KiB
Forth
\ *** Block No. 0 Hexblock 0
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\\ documentation for dargon demo tcas20130106
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start the dragon with : <pos int> DRAG
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or with : <1 or -1> <pos int> DRAGON
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DRAG clears the screen, defines the starting point and executes
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DRAGON.
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The variable STEPSIZE defines the size of steps between 1 and 3
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(larger values will produce grabage)
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odd numbers as input values do not work
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DDEMO is a loop executing the DRAGON demo which can be stopped
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with a keypress once the 2nd dragon is fully painted (it is
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recommended to press a key a little in advance)
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\ *** Block No. 1 Hexblock 1
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\ dragon-loadscreen cas20130106
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Onlyforth
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\needs Graphics include line_a.fb
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Onlyforth GEM also Graphics also
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decimal
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1 5 +thru
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\ *** Block No. 2 Hexblock 2
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\ dragon s.2 03oct86we
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Variable angle
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Variable stepsize 1 stepsize !
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Variable color 1 color !
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Variable xcood Variable ycood
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\ *** Block No. 3 Hexblock 3
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\ set_pixel 03oct86we
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Label ?step
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stepsize pcrel) D2 move D1 tst 0<> IF D2 neg THEN rts
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Code set_pixel
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xcood pcrel) D3 move ycood pcrel) D4 move
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angle pcrel) D0 move 1 # D0 asr D0 D1 move 1 D0 andi
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1 # D1 asr 1 D1 andi
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D0 tst 0= IF ?step bsr D2 D3 add D3 xcood R#) move THEN
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D0 tst 0<> IF ?step bsr D2 D4 add D4 ycood R#) move THEN
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D3 SP -) move D4 SP -) move color pcrel) SP -) move
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;c: put_pixel ;
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\ *** Block No. 4 Hexblock 4
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\ dragon s.3 03oct86we
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Code turn ( n -- )
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angle pcrel) D0 move SP )+ D0 add D0 angle R#) move
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Next end-code
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: dragon recursive ( stepw rec_tiefe -- )
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dup 0= IF 2drop set_pixel
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ELSE
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over turn
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1 over 1- dragon
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over 2* negate turn
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-1 over 1- dragon
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drop turn
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THEN ;
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\ *** Block No. 5 Hexblock 5
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\ dragon s.4 03oct86we
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: drachen
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2 stepsize !
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100 xcood ! 200 ycood ! 1 14 dragon
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101 xcood ! 200 ycood ! 1 14 dragon
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100 xcood ! 201 ycood ! 1 14 dragon
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101 xcood ! 201 ycood ! 1 14 dragon
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1 stepsize ! ;
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: schubs
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100 0 DO I 112 over - 400 272 2over >r 1+ r> 1-
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scr>scr LOOP ;
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\ *** Block No. 6 Hexblock 6
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\ dragon s.5 03oct86we
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: drag ( n -- ) page
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angle off 100 xcood ! 200 ycood !
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1 swap dragon ;
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: ddemo
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16 drag schubs
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0 color ! 199 xcood ! 100 ycood ! 1 16 dragon
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1 color ! drachen ;
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\ *** Block No. 7 Hexblock 7
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\ 03oct86we
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