Thanks to all who replied. I think my immediate problem was trying to
get stuff from a rectangle that extended beyond the actual rendered
area, as Richard mentions: this causes an 'Execution Error' with no
further detail, so it's hard to know what has gone wrong - but finger
trouble, essentially.
However Richard your other point:
The rect option can be useful at times, but since v2.7 we've had a
much
easier and more robust method of exporting images of objects by
specifying the object itself rather than a rect:
import snapshot from img "MyImage"
The object needn't be an image; it can be anything other than a stack
(referencing the card will work for those), even groups.
The big difference is how the image is generated:
Using the rect option cips a portion of the display buffer, so if
your
image is out of bounds there won't be anything to get.
But using an object reference causes the engine to render the object
into a private buffer for you, much like it would do when rendering
the
image on a card, and then hands that buffer back to you in the
resulting
image.
In my experience using object references is reliable under a much
wider
range of circumstances than using rects, even with objects on cards
that
aren't open.
This extension to the snapshot syntax was a by-product of the massive
rendering overhaul Mark Waddingham did for v2.7, and one that's done
wonders here for making screenshots very easily.
Is not so easy to follow if you're trying to build up a composite
image: say for the sake of argument one has a picture (an image)
occupying some part of a card, and one imposes on top of it another
image, with the intention of snapshotting the combined image so as to
create a new picture that can be exported: it might be a jpg of a
membership card with the member's picture imposed on it, or something
like that. Then if I import a snapshot of my background image (the
card design), won't my foreground image (the member's picture) be
ignored? That's how I read the docs - so what I did in the end was to
use a rect based on the background image, something like:
import snapshot from rect (the rect of of img "MembershipCard")
This worked, but it appeared to me that I had to have a window (card,
stack) as big as the whole background image if nothing is to be
clipped, which was inconvenient.
Anyway I have cracked it, but I don't think the docs tell you all the
ins and outs - and IMHO there aren't enough examples.
Thanks again
Graham
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