plgdidev: Get parameters that define current device-space window

`plgdidev`: Get parameters that define current device-space window
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`plgdidev`: Get parameters that define current device-space window

`plgdidev (`	`p_mar`,
	`p_aspect`,
	`p_jx`,
	`p_jy)`;

Get relative margin width, aspect ratio, and relative justification that define current device-space window. If plsdidev has not been called the default values pointed to by p_mar, p_aspect, p_jx, and p_jy will all be 0.

p_mar (PLFLT_NC_SCALAR, output): Returned value of the relative margin width.
p_aspect (PLFLT_NC_SCALAR, output): Returned value of the aspect ratio.
p_jx (PLFLT_NC_SCALAR, output): Returned value of the relative justification in x.
p_jy (PLFLT_NC_SCALAR, output): Returned value of the relative justification in y.

Redacted form: plgdidev(p_mar, p_aspect, p_jx, p_jy)

This function is used in example 31.

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