Hmm, you are right. This is going to need some
more investigation and probably will go into
Rambo.
(I think I remember this problem from years ago...)
A possible workaround *may* be to do it by setting b/saved-area
to what the background should be.
Or else you must view the window to render the effects:
window: layout [
t: text "I am text underneath" effect [merge luma 20]
at 10x10
b: box "hello" with [color: none] effect [merge gradmul 120.120.120
150.140.130]
]
view/new/offset window -1000x-1000 ; necessary for win-offset? to work (uses
parent-face)
image: copy/part skip to-image window win-offset? b b/size
unview/only window
view layout [image (image)]
Not entirely satisfactory, since a window is created and destroyed
in a flicker. If you have many faces to do, then there is a flickering
user interface. Perhaps to alleviate this an already open window can
be used, though I suspect clipping will not allow faces with negative
offsets to be rendered properly.
Anton.
> Hi all,
>
> If you have a transparent face in View, it can be used to grab an
> image of the faces under it. However, I can only get this to
> work on a layout in an open window - when I attempt it on layout,
> all I get is a black image.
>
> Here's an example of this: Just run it, click on the "Grab Area"
> button and you'll see what I mean...
>
>
> rebol []
> lo: layout [
> title "Grab area test."
> at 30x20
> b: box 80x30 with [color: none] ; Transparent box.
> button "Grab Area" [
> window-grab: to-image b
> unview/all
> ]
> ]
> lo-grab: to-image b
> view lo
> view layout [
> backdrop green
> text "Image grab from layout..."
> image lo-grab
> text "Image grab from window..."
> image window-grab
> ]
>
>
> So, is there a way to do this on just a layout?
>
> Thanks in advance,
>
> -- Carl Read.
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