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rosetta-code.metronome: simplify stack shuffling

db4
Jon Harper 2013-09-29 19:24:37 +02:00
parent 939395ac13
commit ccf1b82882
1 changed files with 8 additions and 10 deletions
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18
extra/rosetta-code/metronome/metronome.factor
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@ -2,9 +2,8 @@
! See http://factorcode.org/license.txt for BSD license.
USING: accessors calendar circular colors.constants colors.hsv
concurrency.semaphores generalizations kernel math
openal.example threads timers ui ui.gadgets ui.gadgets.worlds
ui.pens.solid ;
concurrency.semaphores kernel math openal.example threads timers
ui ui.gadgets ui.gadgets.worlds ui.pens.solid ;
IN: rosetta-code.metronome
: bpm>duration ( bpm -- duration ) 60 swap / seconds ;
@ -27,16 +26,15 @@ IN: rosetta-code.metronome
acquire [ play-note ] [ drop find-world handle>> ] 2bi
] curry with circular-loop ;
: start-metronome-timer ( bpm semaphore -- timer )
: (start-metronome-timer) ( bpm semaphore -- timer )
[ release ] curry swap bpm>duration every ;
: start-metronome-timer ( bpm -- timer semaphore )
0 <semaphore> [ (start-metronome-timer) ] keep ;
: metronome ( bpm notes -- )
<circular> open-metronome-window
swap 0 <semaphore>
{
[ 2nip start-metronome-timer ]
[ metronome-loop drop ]
} 4 ncleave
[ start-metronome-timer ] dip
[ open-metronome-window ] 2dip <circular> swap metronome-loop
stop-timer ;
! example usage: 60 { 440 220 330 } metronome