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plgvpd: Get viewport limits in normalized device coordinates
DESCRIPTION:
This function is used in example 31.
SYNOPSIS:
plgvpd(p_xmin, p_xmax, p_ymin, p_ymax)
ARGUMENTS:
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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