plgvpd: Get viewport limits in normalized device coordinates

`plgvpd`: Get viewport limits in normalized device coordinates
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#### `plgvpd`: Get viewport limits in normalized device coordinates

`plgvpd (` | p_xmin,
| p_xmax,
| p_ymin,
| p_ymax`)`;

Get viewport limits in normalized device coordinates.

`p_xmin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the lower viewport limit of the normalized device coordinate in x.

`p_xmax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the upper viewport limit of the normalized device coordinate in x.

`p_ymin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the lower viewport limit of the normalized device coordinate in y.

`p_ymax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the upper viewport limit of the normalized device coordinate in y.

Redacted form:

- General: `plgvpd(p_xmin, p_xmax, p_ymin, p_ymax)`

This function is used in example 31.

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