a2dCanvasDocumentIOHandlerImageOut is for writing a document to a file as image
(look in samples for
usage).
Using any a2dDrawer is possible.
It does not limit the resolution to only the window size pixels.
But it seems you already solved it.
Wonder if a2dAggDrawer could have solved it too?
Are is a2dImageRGBA saving you this time?
Just curious, did not know this could be done :-)
Klaas
On 21-12-2011 17:20, Süleyman Demir wrote:
> Hi Klaas,
>
>> Do you want to place a transparent bitmap on the canvas?
>> Or do you want to see the desktop or something what is behind your
>> application?
>> Like a sort of overlay.
> neither of the two.
>
> Need a wxImage or a wxBitmap of my canvas and would like to save it in a
> file. Now when I open the file in a viewer the background should
> transparent, so that I can see only the objects.
>
> a2dAggDrawerRgba and a2dImageRGBA have done the work.
>
> a2dCanvas m_canvas;
> a2dAggDrawerRgba m_drawer2d;
> m_canvas->SetBackgroundFill (a2dFill (wxColour (255, 255, 255, 0),
> a2dFILL_SOLID)); .
> .
> .
> a2dImageRGBA img_rgba = m_drawer2d->GetImageBuffer (); wxImage img =
> img_rgba.GetImage ().Mirror (false); img.SaveFile ("_hihihi.png",
> wxBITMAP_TYPE_PNG);
>
> A png-File with a transparent Background ;-)
>
> Thank you for your help!
>
> Süleyman
>
>> -----Ursprüngliche Nachricht-----
>> Von: klaas.holwerda [mailto:n...@klaasholwerda.nl]
>> Gesendet: Mittwoch, 21. Dezember 2011 14:29
>> An: wxart2d-users_dev@lists.sourceforge.net
>> Betreff: Re: [Wxart2d-users_dev] wxBitmap with Alpha-Channel from my
>> Canvas
>>
>> Sorry i don't understand the question.
>>
>> Do you want to place a transparent bitmap on the canvas?
>> Or do you want to see the desktop or something what is behind your
>> application?
>> Like a sort of overlay.
>>
>> At least a2dAggDrawerRgba has an alpha channel.
>> But never tried it.
>> In principle a a2dCanvas is a wxWindow, so if you can do such a thing with
>> a wxWindow, it can be
>> done here.
>>
>> But maybe you prefer without a double buffer approach, and instead just
>> draw objects.
>> Like a2dDcDrawer is used to draw on a printer without bitmap in between.
>>
>> But again it not clear to me what you want.
>>
>> Klaas
>>
>> On 21-12-2011 9:15, Süleyman Demir wrote:
>>> Hi there, need a wxBitmap with an alpha channel from my canvas.
>>> I want to set the background transparent so that i can only see the
>> objects
>>> in the bitmap.
>>>
>>> is that possible?
>>>
>>>
>>
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