| IDL compound widgets [message #13173] |
Wed, 14 October 1998 00:00 |
Craig Hamilton
Messages: 28
Registered: December 1996
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Junior Member |
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Hi all:
I'm trying to build a compound widget for image display. I want the user to
be
able to call it as:
cw_image(dataset)
where dataset is a two or three dimensional array, something like
intarr(256,256,30).
I also want to be able to have multiple cw_image widgets active at the same
time.
The cw_image widget needs access to the values in the dataset, to display
values
as the cursor moves across the image. The compound widget info in the
manuals
suggest stuffing a state variable in the user value of the next-to-the-top
widget in
the tree, but I sure don't want to stuff the dataset in there. I can't use
a COMMON
because I want multiple cw_image widgets.
So, the event handler in my cw_image widget really needs a pointer to
dataset, right?
I can put the pointer in the state variable and get to the image data that
way. But, I
don't want the user to have to mess with pointers; I want the data to come
in as
an array.
IDL doesn't seem to let me use the address of the array as a pointer, right?
That is
one difference between C pointers and IDL pointers.
I hope this isn't too confusing, but the bottom line question is: How can a
compound
widget receive a huge dataset and be able to read values from the dataset in
its event callback? [And be able to have multiple realizations of the
widget active
at the same time with different size data sets]
Any tips most appreciated.
Craig Hamilton
cah@medeng.wfubmc.edu
The Wake Forest Univ. School of Medicine
Winston-Salem, NC, USA
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