xscanmap
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## xscanmap

xscanmap — Allows the position and velocity of a node in a scanned process to be read.

## Description

Allows the position and velocity of a node in a scanned process to be read.

## Syntax

    kpos, kvel xscanmap iscan, kamp, kvamp [, iwhich]

## Initialization

iscan -- which scan process to read

iwhich (optional) -- which node to sense. The default is 0.

## Performance

kamp -- amount to amplify the kpos value.

kvamp -- amount to amplify the kvel value.

The internal state of a node is read. This includes its position and velocity. They are amplified by the kamp and kvamp values.

## Examples

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

Example 979. Example of the xscanmap opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac    ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o xscanmap.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1
    ;the matrices can be found in /manual/examples

    instr 1	; Plain scanned syntnesis
    	; note - scanu display is turned off
    a0    = 0
          xscanu   1, .01, 6, 2, "128-stringcircularX", 4, 5, 2, .1, .1, -.01, .1, .5, 0, 0, a0, 0, 0
      a1  xscans   p4, cpspch(p5), 7, 0, 3
    k1,k2 xscanmap 0, 1000, 1000, 64
          display  k1, .25 ; note - display is updated every second
          outs     a1, a1
    endin

    instr 2	; Scan synthesis with audio injection and dual scan paths
    	; note - scanu display is turned off
    ain   diskin2 "fox.wav",1,0,1
    ain   in
    a0    = ain/10000
          xscanu   1, .01, 6, 2, "128,8-gridX", 14, 5, 2, .01, .05, -.05, .1, .5, 0, 0, a0, 0, 0
    a1    xscans   p4, cpspch(p5), 7, 0, 2
    a2    xscans   p4, cpspch(p6), 77, 0, 3
    k1,k2 xscanmap 0, 1000, 1000, 127
          display  k2, .5  						; note - display is updated ever 500ms
          outs     a1,a2
    endin

    </CsInstruments>
    <CsScore>
    ; Initial condition
    ;f1 0 16 7 0 8 1 8 0
    f1 0 128 7 0 64 1 64 0

    ; Masses
    f2 0 128 -7 1 128 1

    ; Centering force
    f4  0 128 -7 0 128 2
    f14 0 128 -7 2 64 0 64 2

    ; Damping
    f5 0 128 -7 1 128 1

    ; Initial velocity
    f6 0 128 -7 -.0 128 .0

    ; Trajectories
    f7 0 128 -5 .001 128 128
    f77 0 128 -23 "128-spiral-8,16,128,2,1over2"

    ; Sine
    f9 0 1024 10 1
    ;--------------------------------
    ; Note list
    i1 0 10 .9 7.00
    s
    i2 0 10 1  8.00 6.00
    i2 0 10 1  7.00 8.05
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

More information on Scanned Synthesis (as well as several other matrices) is available on the Scanned Synthesis page at cSounds.com.

Also an article on these opcodes: http://www.csounds.com/stevenyi/scanned/yi_scannedSynthesis.html , written by Steven Yi

## Credits

Author: John ffitch

New in version 4.20

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