Capturing transparent faces.

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.

Carl Read wrote:

>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. >] >lo-grab: to-image b

On 6/25/05, Petr Krenzelok <[petr--krenzelok--trz--cz]> wrote:

> Carl Read wrote: > >Hi all, > the first time. Imo layout just defines structures, but does not apply > effect, until the face is actually shown.

> But - even if you first apply > "view lo" and then "lo-grab: to-image b", you apply 'unview after the > To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject.

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 >C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C8C... >!>> view layout[image lo-grab]

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: > >!>> 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.

> 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] >

> -- Carl Read. > > -- > To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject. >

On Sunday, 26-June-2005 at 1:30:49 Volker Nitsch wrote,

>> >Pekr, if you continue at that pace, you will be guru shortly ;) >> >And the solution is: >Easier than those numbers to exact face-content: > lo-grab: copy/part at to-image lo b/offset b/size

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.