The PLplot Plotting Library: Programmer's Reference Manual
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### `plgpage`: Get page parameters

`plgpage` (xp, yp, xleng, yleng, xoff, yoff);

Gets the current page configuration. The parameters are expressed in units that are specific to the current driver. For instance: screen drivers will usually interpret them as number of pixels, whereas printer drivers will usually use mm.

`xp` (`PLFLT *`, output) Pointer to number of pixels in x. `yp` (`PLFLT *`, output) Pointer to number of pixels in y. `xleng` (`PLINT *`, output) Pointer to x page length value. `yleng` (`PLINT *`, output) Pointer to y page length value. `xoff` (`PLINT *`, output) Pointer to x page offset. `yoff` (`PLINT *`, output) Pointer to y page offset.

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`plglevel`: Get the (current) run level | Up | `plgra`: Switch to graphics screen