Matrix digital rain: Difference between revisions
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END { print "\e[?25h \e[H\e[J";} # clear and reset screen</lang> |
END { print "\e[?25h \e[H\e[J";} # clear and reset screen</lang> |
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{{out|Sample output}} |
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See [https://github.com/thundergnat/rc/blob/master/img/matrix-digital-rain-perl6.png matrix-digital-rain-perl6.png] (offsite png image) |
Revision as of 00:25, 19 December 2018
Implement the Matrix Digital Rain visual effect from the movie "The Matrix" as described in Wikipedia.
Provided is a reference implementation in Common Lisp to be run in a terminal.
Common Lisp
Runs in the terminal (using the Ncurses C library and the croatoan Lisp wrapper).
<lang lisp> (defun matrix-digital-rain ()
(with-screen (scr :input-echoing nil :input-blocking nil :cursor-visibility nil) (let* ((width (.width scr)) (height (.height scr)) ;; start at a random height in each column. (pos (loop repeat width collect (random height))) ;; run each column at a random speed. (speeds (loop repeat width collect (random 4)))) ;; hit the q key to exit the main loop. (add-event-handler (scr #\q) 'exit-event-loop) (add-event-handler (scr nil) (lambda (win event) ;; generate a random ascii char (flet ((randch () (+ 64 (random 58)))) (loop for col from 0 to (1- width) do (loop repeat (nth col speeds) do (setf (.attributes win) '(:bold)) (setf (.color-pair win) '(:white :black)) (add win (randch) :y (mod (nth col pos) height) :x col) (setf (.color-pair win) '(:green :black)) (add win (randch) :y (mod (- (nth col pos) 1) height) :x col) (add win (randch) :y (mod (- (nth col pos) 2) height) :x col) (setf (.attributes win) '()) (add win (randch) :y (mod (- (nth col pos) 3) height) :x col) ;; overwrite the last char half the height from the first char. (add win #\space :y (mod (- (nth col pos) (floor height 2)) height) :x col) (refresh win) ;; advance the column (setf (nth col pos) (mod (1+ (nth col pos)) height))))))) (setf (.frame-rate scr) 20) (run-event-loop scr))))
</lang>
Perl 6
Kind of cheap and cheesy, but what the heck... Probably will only work in POSIX compatible terminal. Runs until you hit ^C to exit.
<lang perl6>my @codes = flat 'Α' .. 'Π', 'Σ' .. 'ѵ', 'Ѐ' .. 'ѵ', 'Ҋ' .. 'ԯ', 'Ϣ' .. 'ϯ',
'Ⲁ' .. '⳩', '∀' .. '∗', '℀' .. '℺', '⨀' .. '⫿';
my ($rows,$cols) = qx/stty size/.words;
my @c = flat "\e[38;2;255;255;255m", (255,240 … 30).map({"\e[38;2;0;$_;0m"}),
"\e[38;2;0;25;0m" xx 250;
my $sz = +@c; my (@o, @s, @a); print "\e[?25l"; init($rows, $cols);
loop {
my ($r,$c) = qx/stty size/.words; init($r, $c) if $r != $rows or $c != $cols; print "\e[1;1H"; for ^@s { print (@c[@a[$_]<fg>], @a[$_]<bg>, @s[$_]).join; @a[$_]<fg> = (@a[$_]<fg> + 1) % $sz; } @s[(^@s).pick] = @codes.roll for ^100;
}
sub init ($r, $c) {
@s = @codes.roll($r * $c); ($rows,$cols) = $r, $c; @a = {:bg("\e[48;5;232m")} xx +@s; my @o = (^@c).pick xx $cols; for ^$rows -> $row { for ^$cols -> $col { @a[$row * $cols + $col]<fg> = @o[$col]; } @o = (^@o).map: {(@o[$_] - 1) % $sz}; }
}
END { print "\e[?25h \e[H\e[J";} # clear and reset screen</lang>
- Sample output:
See matrix-digital-rain-perl6.png (offsite png image)