lincos
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## lincos

lincos — Linear to cosine interpolation

## Description

Plugin opcode in emugens.

Maps a linear range of values to a cosine (easy-in/easy-out) range of values. At present it supports only scalars, at i- and k-time (no arrays)

## Syntax

    ky lincos kx, ky0, ky1 [, kx0, kx1 ]

    iy lincos ix, iy0, iy1 [, ix0, ix1 ]

## Performance

kx -- Input signal

ky0 -- Lower limit of output range

ky1 -- Higher limit of output range

kx0 -- Lower limit of input range (default = 0)

kx1 -- Higher limit of input range (default = 1)

    dx = ((x-x0) / (x1-x0)) * PI + PI
    y  = y0 + ((y1 - y0) * (1 + cos(dx)) / 2.0);

## Examples

Here is an example of the lincos opcode. It uses the file lincos.csd.

Example 500. Example of the lincos opcode.

    <CsoundSynthesizer>
    <CsOptions>
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 128
    nchnls = 2
    0dbfs = 1.0

    ; Example file for lincos.csd

    /*
      lincos

      similar to cosseg, but with an explicit input for time
      lincos can be used ease-in / out any linear ramp

      ky  lincos kx, ky0, ky1, kx0=0, kx1=1
      iy  lincos ix, iy0, iy1, ix0=0, ix1=1

    */

    seed 0

    instr 1
      ; Map a value within the range 1-3 to the range 0-10.
      iy lincos 1.5, 0, 10, 1, 3
      print iy
      kx line 1, p3, 3
      ky lincos kx, 0, 10, 1, 3
      printks "kx: %f   ky: %f \n", 1/kr, kx, ky
    endin

    instr 2
      ; lincos can be used to create amplitude or pitch envelopes
      ktrig init 0
      krnd dust 1, 1
      ktrig = lineto(tirghold(krnd & ~ktrig, 0.5), 1)
      kpitch = lincos:k(ktrig, 60, 61)
      a0 oscili 0.7, mtof(kpitch)

      kfade  lincos linsegr(0, 1.5, 1, 1.5, 0), 0, 1
      kcresc lincos ktrig, 0.25, 1
      outch 1, a0 * interp(kfade * kcresc)
    endin

    </CsInstruments>
    <CsScore>

    i 1 0 0.2
    i 2 0 20

    </CsScore>
    </CsoundSynthesizer>

## See Also

linlin, cosseg, scale, ntrpol, bpf

## Credits

By: Eduardo Moguillansky 2018

New plugin in version 6.12

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