[wxhaskell-users] How to resize a bitmap ?

[D.V. <dav.vire@gm...>]

Bonjour List,

If there a way to draw a bitmap so it fits a specific size (rescaling
it if needed ?)

I didn't find a way in the docs, but the documentation for drawBitmap
is thin, wxWidget help didn't help much.

Thanks !

David.

Re: [wxhaskell-users] How to resize a bitmap ?

[Eric Y. Kow <eric.kow@gm...>]

Hi,

On Thu, Sep 01, 2011 at 13:14:48 +0200, D.V. wrote:
> If there a way to draw a bitmap so it fits a specific size (rescaling
> it if needed ?)
> 
> I didn't find a way in the docs, but the documentation for drawBitmap
> is thin, wxWidget help didn't help much.

I think you'll want to use the wxImage::Scale function [1], which is
exposed as imageScale in wxcore.

(I don't really remember the details here) It's useful to know that
wxHaskell has an automatically generated bit of Haskell from a C++ => C
wrapper. So if it's in wxWidgets, it may just be buried away in wxcore
somewhere [2], even if it's not exposed with a nice library function or
bubbled up in wx.

The scale function from the wxImage class is called imageScale (the
names are generated automatically: drop the wx, camel case, etc)...

[1]: http://wiki.wxwidgets.org/WxImage
[2]: http://hackage.haskell.org/packages/archive/wxcore/0.12.1.7/doc/html/Graphics-UI-WXCore-WxcClassesAL.html

-- 
Eric Kow <http://erickow.com>;

Re: [wxhaskell-users] How to resize a bitmap ?

[Dave Tapley <dukedave@gm...>]

On 1 September 2011 12:14, D.V. <dav.vire@...> wrote:

> Bonjour List,
>
> If there a way to draw a bitmap so it fits a specific size (rescaling
> it if needed ?)
>

Erm, well it appears that imageScale is wrapped by wxcore (I'm not sure how
familiar you are with wxHaskell?), so it *might* just work, see here:
http://hackage.haskell.org/packages/archive/wxcore/0.12.1.7/doc/html/Graphics-UI-WXCore-WxcClassesAL.html#g:105

There is a basic image view program here:
http://code.haskell.org/wxhaskell/samples/wxcore/ImageViewer.hs

So it might be fun so see if you can use imageScale easily with that, you
could even extend the sample code to provide zoom functionality and send a
patch back to the list :)

Good luck,
Dave



>
> I didn't find a way in the docs, but the documentation for drawBitmap
> is thin, wxWidget help didn't help much.
>
> Thanks !
>
> David.
>
>
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Re: [wxhaskell-users] How to resize a bitmap ?

[D.V. <dav.vire@gm...>]

2011/9/1 Dave Tapley <dukedave@...>:
> On 1 September 2011 12:14, D.V. <dav.vire@...> wrote:
>>
>> Bonjour List,
>>
>> If there a way to draw a bitmap so it fits a specific size (rescaling
>> it if needed ?)
>
> Erm, well it appears that imageScale is wrapped by wxcore (I'm not sure how
> familiar you are with wxHaskell?), so it *might* just work, see here:
> http://hackage.haskell.org/packages/archive/wxcore/0.12.1.7/doc/html/Graphics-UI-WXCore-WxcClassesAL.html#g:105

Thanks, that file had the function I needed, turned out I just had
something work with dcSetUserScale.

That's not to say that my troubles are over, but now I can move forward !

David.