75 lines
1.9 KiB
Forth
75 lines
1.9 KiB
Forth
~~~
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:pixel (xyc-) #33 io:scan-for io:invoke ;
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:get-pixel (xy-c) #34 io:scan-for io:invoke ;
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:mouse (-xyb) #35 io:scan-for io:invoke ;
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:hline (xyw-)
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[ dup-pair #1 pixel &n:inc dip ] times drop-pair ;
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:vline (xyh-)
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[ dup-pair #1 pixel n:inc ] times drop-pair ;
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:dline\ (xyl-)
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[ dup-pair #1 pixel &n:inc bi@ ] times drop-pair ;
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:dline/ (xyl-)
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[ dup-pair #1 pixel &n:dec &n:inc bi* ] times drop-pair ;
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'X var 'Y var 'H var 'W var
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:rect (xyhw-) !W !H !Y !X
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@X @Y @W hline @X @Y @H n:add @W hline
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@X @Y @H vline @X @W n:add @Y @H vline ;
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'XC var 'YC var 'X var 'Y var
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:octant (xc,yc,x,y)
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!Y !X !YC !XC
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@XC @X n:add @YC @Y n:add #1 pixel
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@XC @X n:sub @YC @Y n:add #1 pixel
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@XC @X n:add @YC @Y n:sub #1 pixel
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@XC @X n:sub @YC @Y n:sub #1 pixel
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@XC @Y n:add @YC @X n:add #1 pixel
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@XC @Y n:sub @YC @X n:add #1 pixel
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@XC @Y n:add @YC @X n:sub #1 pixel
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@XC @Y n:sub @YC @X n:sub #1 pixel ;
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'XC var 'YC var 'X var 'Y var 'D var 'R var
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:circle (xyr-)
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!R !YC !XC #0 !X @R [ !Y ] [ !D ] bi
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@XC @YC @X @Y octant
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[ &X v:inc
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@D n:strictly-positive?
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[ &Y v:dec @X @Y n:sub @R n:mul #2 n:mul @D n:add !D ]
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[ #2 @R n:mul @X n:mul @D n:add !D ] choose
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@XC @YC @X @Y octant
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@Y @X gteq? ] while ;
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'X var 'Y var 'C var 'D var 'R var
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:t:raise #0 !C ;
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:t:lower #1 !C ;
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:t:left [ &X v:dec ] !D ;
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:t:right [ &X v:inc ] !D ;
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:t:up [ &Y v:dec ] !D ;
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:t:down [ &Y v:inc ] !D ;
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:t:at (xy-) !Y !X ;
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:t:forward (n-) [ @X @Y @C pixel @D call ] times ;
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#320 #240 t:at t:lower t:right
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:t:down-right [ &Y v:inc &X v:inc ] !D ;
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:t:down-left [ &Y v:inc &X v:dec ] !D ;
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:t:up-left [ &Y v:dec &X v:dec ] !D ;
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:t:up-right [ &Y v:dec &X v:inc ] !D ;
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'Rotations d:create #8 ,
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&t:right , &t:down-right , &t:down ,
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&t:down-left , &t:left , &t:up-left ,
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&t:up , &t:up-right ,
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:t:rotate
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&R v:inc @R #8 eq? [ #0 !R ] if &Rotations @R a:fetch call ;
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~~~
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