ftp.nice.ch/pub/next/unix/developer/plplot.3.0.s.tar.gz#/plplot/src/xform.c

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#include "plplot.h"

FLOAT tr[6];

void xform(x,y,tx,ty)
double x, y, *tx, *ty;
{
   *tx = tr[0] * x + tr[1] * y + tr[2];
   *ty = tr[3] * x + tr[4] * y + tr[5];
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.