NAME

modify - define a linear mapping between a valuator and a command argument

SYNOPSIS

C

modify(obj, tagname, offst, argnum, a, b, v)
Object obj;
Tag tagname;
Offset offst;
short argnum;
float a, b;
Device v;

FORTRAN
subroutine modify(obj, tagnam, offst, argnum, a, b, v)
integer obj, tagnam, offst
integer*2 argnum, v
real a, b

Pascal
procedure modify(obj: Object; tagname: Tag; offst: Offset;
argnum: Short; a, b: real; v: Device);

DESCRIPTION

The modify command provides a general mechanism for defining a linear mapping between an input device and a command argument.  The first four parameters, obj, tagname, offst, and argnum, uniquely define an argument to a command in a display list.  The next two, a and b, are coefficients used in the computation of the new value for the selected argument, and v selects a valuator device.  The mapping is a $times$ getvaluator(v) + b. 

The modify is implemented for the following commands:

SEE ALSO

getvaluator

Version 2.3  —  July 04, 1985