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[REBOL] Re: Capturing transparent faces.

From: volker:nitsch:gm:ail at: 26-Jun-2005 1:30

On 6/26/05, Carl Read <[carl--cybercraft--co--nz]> wrote:
> On Saturday, 25-June-2005 at 23:47:09 Volker Nitsch wrote, > > >On 6/25/05, Petr Krenzelok <[petr--krenzelok--trz--cz]> wrote: > > >> >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 > >> > > >> > > >> > >> Look, I am no guru at View, but imo following happens. Feel free to > >> correct me eventually: > >> > >> you create snapshot of 'b (lo-grab), even before it is being shown for > >> the first time. Imo layout just defines structures, but does not apply > >> effect, until the face is actually shown. > > > >Pekr, if you continue at that pace, you will be guru shortly ;) > >And the solution is: > >You can show things without viewing them. > >That forces /view to paint into the internal buffers. > >A to-image just dumps these buffers, without a 'show there is just black.. > >So > > > >!>> 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 > >[ ] > >[ ] > >!>> show lo > >; ^^^^^^^^!!!!!!!!! > >!>> lo-grab: to-image lo > >== make image! [220x102 #{ > >C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8 > >C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C... > >!>> view layout[image lo-grab] > > Thanks Volker (and Petr), but that still doesn't do what I want, which is to capture 'b, not 'lo. >
Tried a bit, quite confusing. found two ways: 1) One was with 'view, grabbing the face itself does not work without it. 2) But what you can do is: lo-grab: copy/part at to-image lo 30x20 80x30 (note you have to get it from the whole layout, not just the box) Easier than those numbers to exact face-content: lo-grab: copy/part at to-image lo b/offset b/size
> And incidentally, you don't need to SHOW a layout before capturing it - this works just fine... > > pic: to-image layout [text "Some text." button "A button"] > view layout [image pic] >
Ooops. hmm. Once long before something did not work! Must have been something different. Ok, thanks for the tip :)
> -- Carl Read. > > -- > To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject. >
-- -Volker Any problem in computer science can be solved with another layer of indirection. But that usually will create another problem. David Wheeler