plgspa: Get current subpage parameters

`plgspa`: Get current subpage parameters
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#### `plgspa`: Get current subpage parameters

`plgspa (` | xmin,
| xmax,
| ymin,
| ymax`)`;

Gets the size of the current subpage in millimeters measured from the bottom left hand corner of the output device page or screen. Can be used in conjunction with `plsvpa` for setting the size of a viewport in absolute coordinates (millimeters).

`xmin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the position of the left hand edge of the subpage in millimeters.

`xmax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the position of the right hand edge of the subpage in millimeters.

`ymin` (``PLFLT_NC_SCALAR``, output)

  Returned value of the position of the bottom edge of the subpage in millimeters.

`ymax` (``PLFLT_NC_SCALAR``, output)

  Returned value of the position of the top edge of the subpage in millimeters.

Redacted form: `plgspa(xmin, xmax, ymin, ymax)`

This function is used in example 23.

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