McIDAS User's Guide
Version 2015.1

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VIRT

This keyword specifies a virtual graphics number. It applies only to commands that generate graphics. To list your virtual graphics files, use DMAP VIRT.

VIRT=

number A

appends the graphics to the specified virtual graphics number, the range is 1 to 9999

 

number R

replaces the graphics in the specified virtual graphics number, the range is 1 to 9999 (default)

Graphics are simultaneously drawn on a graphics frame and saved to a designated file. The file name is of the form VIRTxxxx where xxxx is the number specified in the keyword. Below are three examples.

MAP USA VIRT=1

This entry draws a map of the USA on the graphics frame and writes the output to file VIRT0001, which can later be restored using the SHOWVG command.

MAP USA X LALO VIRT=1 A

This entry draws a map of the USA on the graphics frame, appending it to the output in file VIRT0001. It can later be restored using the SHOWVG command.

MAP MID VIRT=1 R

This entry replaces the USA map above with a map of the Midwest United States.

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