xyscale
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## xyscale

xyscale — 2D linear interpolation

## Description

Plugin opcode in emugens.

2D linear interpolation between 4 points at (0,0), (1,0), (0,1), (1,1)

## Syntax

    kout xyscale kx, ky, k00, k10, k01, k11

## Performance

kx, ky -- Coordinates to evaluate the interpolation. Value between 0-1, where:

k00 -- Value of point at coord (x=0, y=0)

k10 -- Value of point at coord (x=1, y=0)

k01 -- Value of point at coord (x=0, y=1)

k11 -- Value of point at coord (x=1, y=1)

              (0,1)      (1,1)

              (0,0)      (1,0)

Given 4 values placed at the corners of a square, find the interpolated value at point (x, y), where x and y are defined between 0-1.

## Examples

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

Example 1191. Example of the xyscale opcode.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out   Audio in    No messages
    -odac           -iadc     -d     ;;;RT audio I/O
    </CsOptions>
    <CsInstruments>

    ksmps=128
    nchnls=2

    giwidth = 400
    giheight = 300
    FLpanel "FLmouse", giwidth, giheight, 10, 10
    FLpanelEnd

    FLrun

    0dbfs = 1

    instr 1
      ; We define four chords for bottom-left, bottom-right, top-left and top-right
      ; Use the mouse to interpolate between them
      ibl[] fillarray ntom:i("4C"), ntom:i("4Eb"), ntom:i("4G")
      itl[] fillarray ntom:i("4E"), ntom:i("4G#"), ntom:i("4B")
      ibr[] fillarray ntom:i("4G"), ntom:i("4A"), ntom:i("4B")
      itr[] fillarray ntom:i("4Eb"), ntom:i("4Eb+"), ntom:i("4F")

      kmousex, kmousey, kb1, kb2, kb3    FLmouse 2
      kx = limit(kmousex/giwidth, 0, 1)
      ky = 1 - limit(kmousey/giheight, 0, 1)

      printf "x: %f   y: %f \n", changed(kx, ky), kx, ky

      iamp = 0.1
      a0 oscili iamp, mtof(xyscale(kx, ky, ibl[0], itl[0], ibr[0], itr[0]))
      a1 oscili iamp, mtof(xyscale(kx, ky, ibl[1], itl[1], ibr[1], itr[1]))
      a2 oscili iamp, mtof(xyscale(kx, ky, ibl[2], itl[2], ibr[2], itr[2]))
      aout = sum(a0, a1, a2)
      outs aout, aout
    endin

    </CsInstruments>
    <CsScore>
    i 1 0 120

    </CsScore>
    </CsoundSynthesizer>

## See Also

scale, ntrpol, linlin

## Credits

By: Eduardo Moguillansky 2017

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