plgdiplt: Get parameters that define current plot-space window

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgdiplt`: Get parameters that define current plot-space window

`plgdiplt` (p_xmin, p_ymin, p_xmax, p_ymax);

Get relative minima and maxima that define current plot-space window. If `plsdiplt` has not been called the default values pointed to by ``p_xmin``, ``p_ymin``, ``p_xmax``, and ``p_ymax`` will be 0., 0., 1., and 1.

`p_xmin` (`PLFLT *`, output) Pointer to relative minimum in x. `p_ymin` (`PLFLT *`, output) Pointer to relative minimum in y. `p_xmax` (`PLFLT *`, output) Pointer to relative maximum in x. `p_ymax` (`PLFLT *`, output) Pointer to relative maximum in y.

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