Thread: [perl-win32-gui-users] display images--sample code?

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Hi,

ImageMagick for Windows seems to be missing display routines, as the
supplied display utility is X based... or did I miss a key point of
their documentation?

Win32::GUI seems to be able to do something with Bitmaps, but it is not
particularly clear just what, or how.

ImageMagick can do lots of nice conversions of whatever graphic format
to BMP format, if that is what Win32::GUI::Bitmap needs.

I'd like to conquer the functionality of loading a file with
ImageMagick, and then using Win32::GUI to display it.

Loading the file seems to be straightforward:

use Image::Magick;
$image = Image::Magick -> new;
$errstr = $image -> Read ( $filename );

How can I get from there, to a window that displays the data? Do I have
to

$errstr = $image -> Write ( 'xxx.bmp' );

as it appears that the Win32::GUI::Bitmap call requires a filename?

use Win32::GUI;
$bitmap = new Win32::GUI::Bitmap ( 'xxx.bmp' );

or is there a way to avoid the intermediate file?  Using the TBD Create
method?

Or maybe Win32::GUI::BitmapInline?  Although this seems to create its
own intermediate file.

And then, having somehow or another a $bitmap reference, how do I
display it in a window?

I see one possibility of

$main_window -> AddLabel ( -name => bitmap, -bitmap => $bitmap );

Are there any pros or cons of using Labels vs Buttons vs ???  And do you
need to specify the exact size of the bitmap as the size of the label?
Or do you need to leave room for borders, and other stuff?  Some of this
will probably become clear as I start to experiment.

If there are any scaling capabilities, it'd be nice to know about them,
I didn't find any the first pass through.

On the other hand, I fear that none of that will allow me to add scroll
bars to the bitmap, so that I can display a portion of a bigger than
screen image.  I fear I'll have to dive into Win32::GUI::DC to do some
of this... I've been avoiding that so far... but this seems oriented to
line art, rather than bitmap art...

Any advice, guidance, or sample code that I could look at for this,
before I bang a hole in a wall with my head, and then find out it was
the wrong wall!!!  would be welcomed.

Mostly I'm dealing with monochrome bitmaps, if that simplifies things,
but they can get quite large, and scaling and scrolling are requirements
to get the job done.

--
Glenn
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