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| -rw-r--r-- | 2d/signals.scm | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/2d/signals.scm b/2d/signals.scm index 28d2c6f..5a95f9e 100644 --- a/2d/signals.scm +++ b/2d/signals.scm @@ -40,6 +40,8 @@ signal-constant signal-lift signal-lift2 + signal-lift3 + signal-lift4 signal-merge signal-combine signal-count @@ -143,6 +145,25 @@ onto SIGNAL1 and SIGNAL2." (signal-ref signal2))) #:connectors (list signal1 signal2))) +(define (signal-lift3 transformer signal1 signal2 signal3) + "Create a new signal that lifts the procedure TRANSFORMER of arity 3 +onto SIGNAL1, SIGNAL2, and SIGNAL3." + (make-signal (lambda (value prev from) + (transformer (signal-ref signal1) + (signal-ref signal2) + (signal-ref signal3))) + #:connectors (list signal1 signal2 signal3))) + +(define (signal-lift4 transformer signal1 signal2 signal3 signal4) + "Create a new signal that lifts the procedure TRANSFORMER of arity 4 +onto SIGNAL1, SIGNAL2, SIGNAL3, and SIGNAL4." + (make-signal (lambda (value prev from) + (transformer (signal-ref signal1) + (signal-ref signal2) + (signal-ref signal3) + (signal-ref signal4))) + #:connectors (list signal1 signal2 signal3 signal4))) + (define (signal-merge signal1 signal2) "Create a new signal that merges SIGNAL1 and SIGNAL2 into one. The value of the new signal is the value of the most recently changed |