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DCL:GRPH1:SWPACK: Machine-Dependent Routines:Explanation of Subroutines: Control Routines

7.3.1 swdopn/swdcls

1.

Function

Opens/closes a device.

2.

Call

call swdopn
call swdcls

3.

Explanation of Arguments

None.

4.

Notes

(a)

All SWPACK routines except for swpset(swpstx) and swcset(swcstx) are called between these routines.

(b)

STPACK performs the rotation of the coordinate system.

(c)

The internal variable 'IWS' handled by SWpGET/SWpSET must be set before calling swdopn. This internal variable is usually set in sgopn.