OpenEuphoria

Re: Graphics in Win32lib

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

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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
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\__| 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
> > >
> > >
> > ><P>Try StretchBlt and SetStretchBltMode from GDI32.&nbsp; These 
>functions
> > >copy from one DC to another but allow the destination rectangle to be
> > >either smaller or larger the the source rectangle.&nbsp; If so, Windows
> > >will scale the image accordingly.
> > ><P>Don Phillips
> > ><P>&nbsp;<B><I>mistertrik at hotmail.com</I></B> wrote:
> > ><b><a href="http://news.yahoo.com/">Yahoo! News</a></b> - Today's 
>headlines
> > >
> > >
> > =====================================================
> > .______<-------------------\__
> > / _____<--------------------__|===
> > ||_    <-------------------/
> > \__| Mr Trick
> >
> >
>
>







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