plgvpd: Get viewport limits in normalized device coordinates

The PLplot Plotting Library: Programmer's Reference Manual
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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 *`, output) Lower viewport limit of the normalized device coordinate in x. `p_xmax` (`PLFLT *`, output) Upper viewport limit of the normalized device coordinate in x. `p_ymin` (`PLFLT *`, output) Lower viewport limit of the normalized device coordinate in y. `p_ymax` (`PLFLT *`, output) Upper viewport limit of the normalized device coordinate in y.

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`plgver`: Get the current library version number | Up | `plgvpw`: Get viewport limits in world coordinates