The Alternative Csound Reference Manual
Previous |  | Next

# linseg

linseg -- Trace a series of line segments between specified points.

## Description

Trace a series of line segments between specified points.

## Syntax

ar linseg ia, idur1, ib [, idur2] [, ic] [...]

kr linseg ia, idur1, ib [, idur2] [, ic] [...]

## Initialization

ia -- starting value. Zero is illegal for exponentials.

ib, ic, etc. -- value after dur1 seconds, etc. For exponentials, must be non-zero and must agree in sign with ia.

idur1 -- duration in seconds of first segment. A zero or negative value will cause all initialization to be skipped.

idur2, idur3, etc. -- duration in seconds of subsequent segments. A zero or negative value will terminate the initialization process with the preceding point, permitting the last-defined line or curve to be continued indefinitely in performance. The default is zero.

## Performance

These units generate control or audio signals whose values can pass through 2 or more specified points. The sum of dur values may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern, while a longer one will cause the last-defined segment to continue on in the same direction.

## Examples

Here is an example of the linseg opcode. It uses the files linseg.orc and linseg.sco.

Example 1. Example of the linseg opcode.

    /* linseg.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      ; p4 = frequency in pitch-class notation.
      kcps = cpspch(p4)

      ; Create an amplitude envelope.
      kenv linseg 0, p3*0.25, 1, p3*0.75, 0
      kamp = kenv * 30000

      a1 oscil kamp, kcps, 1
      out a1
    endin
    /* linseg.orc */

    /* linseg.sco */
    ; Table #1, a sine wave.
    f 1 0 16384 10 1

    ; Play Instrument #1 for a half-second, p4=8.00
    i 1 0 0.5 8.00
    ; Play Instrument #1 for a half-second, p4=8.01
    i 1 1 0.5 8.01
    ; Play Instrument #1 for a half-second, p4=8.02
    i 1 2 0.5 8.02
    ; Play Instrument #1 for a half-second, p4=8.03
    i 1 3 0.5 8.03
    e
    /* linseg.sco */

## See Also

expon, expseg, expsegr, line, linsegr

## Credits

Example written by Kevin Conder.

Previous | Home | Next
linrand | Up | linsegr