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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