26 lines
580 B
Racket
26 lines
580 B
Racket
#lang scribble/manual
|
|
@(require (for-label racket))
|
|
|
|
@title{(wrap-index bufnum in)}
|
|
|
|
|
|
index into a table with a signal.
|
|
|
|
The input signal value is truncated to an integer value and used as
|
|
an index into the table. out of range index values are wrapped
|
|
cyclically to the valid range.
|
|
|
|
bufnum - index of the buffer
|
|
in - the input signal.
|
|
|
|
|
|
@racketblock[
|
|
(with-sc3
|
|
(lambda (fd)
|
|
(async fd (b-alloc 0 6 1))
|
|
(send fd (b-setn1 0 0 (list 200 300 400 500 600 800)))
|
|
(let ((f (wrap-index 0 (mouse-x kr 0 18 0 0.1))))
|
|
(play fd (out 0 (mul (sin-osc ar f 0) 0.5))))))
|
|
]
|
|
|
|
|