OpenEuphoria

Re: Graphics in Win32lib

• Posted by mistertrik at hotmail.com Oct 10, 2002
• 457 views

It's a zipped bitmap. Given that unzipped it's ~700kb, it was probably 
better zipped. It's an example of the sort of image my program has to 
display. Martin's stretch example mangles it horribly, so I thought it would 
well represent my problem. (if you're still confused, download his stretch 
example from the recent contribution lists, and try displaying fireball.bmp 
in it. You'll soon see what I mean)
=====================================================
.______<-------------------\__
/ _____<--------------------__|===
||_    <-------------------/
\__| Mr Trick


>From: aaron_mr_cooldude at sympatico.ca
>Subject: Re: Graphics in Win32lib
>Date: Fri, 11 Oct 2002 20:30:22 -0400
>
>
>hi what is fire ball?
>----- Original Message -----
>From: <mistertrik at hotmail.com>
>To: EUforum <EUforum at topica.com>
>Sent: Thursday, October 10, 2002 7:50 PM
>Subject: Re: Graphics in Win32lib
>
>
> > Thanks Martin. There's a problem with it though, I think it's the fault 
>of
> > the win function rather than your code, because I found the same thing
> > occurring in a contribution Windows Animation Effect (that used 
>stretchblt
> > as well).
> >
> > My bitmap (in the .zip) has a section that goes from black to orange as 
>a
> > smooth graduation. When it is resized smaller, dark bands appear in the
> > middle of the section. I found a similar thing with the turtle bitmap,
> > although it had to be resized quite small before the effect was noticed.
> > Does anyone know why this is, because such a glitch is not acceptable 
>for
>my
> > purposes? I'm running Win2k here if that helps.
> >
> > Thanks
> > =====================================================
> > .______<-------------------\__
> > / _____<--------------------__|===
> > ||_    <-------------------/
> > \__| Mr Trick
> >
> >
> > >From: Martin Stachon <martin.stachon at worldonline.cz>
> > >Reply-To: EUforum at topica.com
> > >To: EUforum <EUforum at topica.com>
> > >Subject: Re: Graphics in Win32lib
> > >Date: Thu, 10 Oct 2002 18:03:55 +0200
> > >
> > >
> > >Try my "Stretch Bitmap Demo" in Rec Usr Contrib.
> > >
> > >     Martin
> > >
> > > > GDI? What is that?
> > > >
> > > >
> > > > >From: Don Phillips <EuNexus at yahoo.com>
> > > > >Reply-To: EUforum at topica.com
> > > > >To: EUforum <EUforum at topica.com>
> > > > >Subject: Re: Graphics in Win32lib
> > > > >Date: Wed, 9 Oct 2002 22:13:42 -0700 (PDT)
> > > > >
> > > > >
> > > > >Try StretchBlt and SetStretchBltMode from GDI32.  These functions
>copy
> > >from
> > > > >one DC to another but allow the destination rectangle to be either
> > >smaller
> > > > >or larger the the source rectangle.  If so, Windows will scale the
> > >image
> > > > >accordingly.
> > > > >Don Phillips
> > > > >
> > > > >I need to be able to display background images in my window, but as
> > >this is
> > > > >destined to be used by people other than myself, I want it to scale
> > > > >gracefully on other resolutions.
> > > > >
> > > > >At the moment I just use loadbitmapfromfile and BLT it to the 
>screen,
> > >but
> > > > >how would I have a single bitmap image, that I can output as a
>smaller
> > > > >size?
> > > > >
> > > > >I know how to make a simple scaling algorithm if one does not 
>already
> > > > >exist,
> > > > >but how would I get access to the 2d array that loadbitmapfromfile 
>no
> > >doubt
> > > > >puts somewhere, and how would I save my altered array into a bitmap
> > >object?
> > > > >
> > > > >...If that made sense, that is.
> > > > >=====================================================
> > > > >.______<-------------------\__
> > > > >/ _____<--------------------__|===
> > > > >||_ <-------------------/
> > > > >\__| Mr Trick
> > > > >
> > > > >
<snip>

>
>