tie(3G) tie(3G)
NAME
tie - ties two valuators to a button
C SPECIFICATION
void tie(b, v1, v2)
Device b, v1, v2;
PARAMETERS
b expects a button.
v1 expects a valuator.
v2 expects a valuator.
DESCRIPTION
tie requires a button b and two valuators v1 and v2. When a queued
button changes state, three entries are made in the queue: one records
the current state of the button and two record the current positions of
each valuator. The valuators v1 and v2 need not be (and probably should
not be) queued.
You can tie one valuator to a button by calling tie with v2 set to
NULLDEV. You can untie a button by calling tie with both v1 and v2 set
to NULLDEV. v1 appears before v2 in the event queue; b precedes both v1
and v2.
SEE ALSO
getbutton
NOTES
This routine is available only in immediate mode.
The symbol NULLDEV is defined in <gl/device.h>.
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