rx
(PLFLT, input)
Input relative device coordinate (ranging from 0. to 1.) for the
x coordinate.
ry
(PLFLT, input)
Input relative device coordinate (ranging from 0. to 1.) for the
y coordinate.
wx
(PLFLT *, output)
Pointer to the returned world coordinate for x corresponding
to the relative device coordinates
rx and
ry.
wy
(PLFLT *, output)
Pointer to the returned world coordinate for y corresponding
to the relative device coordinates
rx and
ry.
window
(PLINT *, output)
Pointer to the returned last defined window index that corresponds to the
input relative device coordinates (and the returned world
coordinates). To give some background on the window index,
for each page the initial window index is set to
zero, and each time plwind is called within the page, world
and device coordinates are stored for the window and the window
index is incremented. Thus, for a simple page layout with
non-overlapping viewports and one window per viewport,
window corresponds to
the viewport index (in the order which the viewport/windows
were created) of the only viewport/window corresponding to
rx and
ry. However, for
more complicated layouts with potentially overlapping viewports
and possibly more than one window (set of world coordinates) per
viewport, window
and the corresponding output world coordinates
corresponds to the last window created that fulfils the criterion
that the relative device coordinates are inside it. Finally, in
all cases where the input relative device coordinates are not
inside any viewport/window, then
window is set to -1.
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