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From: dale@amiga.UUCP (Dale Luck)
Newsgroups: net.micro.amiga
Subject: Re: Scrolling a SUPERBITMAP raster in Intuition Window
Message-ID: <666@amiga.amiga.UUCP>
Date: Sat, 8-Feb-86 12:38:20 EST
Article-I.D.: amiga.666
Posted: Sat Feb  8 12:38:20 1986
Date-Received: Tue, 11-Feb-86 05:40:39 EST
References: <168@bubba.UUCP>
Reply-To: dale@tooter.UUCP (Dale Luck)
Distribution: net
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 33

In article <168@bubba.UUCP> san@bubba.UUCP writes:
>The scenario and main question is that I have a 1K by 1K bitmap with
>my pre-drawn image on it, and I want to be able to look at ANY portion
>of the bitmap from a window on the workbench.
>.....
>would be possible to scroll the contents of a raster within an
>Intuition window.

    Use ScrollLayer(0,layer,dx,dy)
    You must first open the layer library ("layer.library",31)
    get the layer from your window->WLayer   V1.1
    dx,dy are values that causes scrolling towards upper-left.
    Note: You should be using a GIMMEZEROZERO window.

>
>lower level I would change the RxOffset and RyOffset for the ViewPort
>to change what portion is being displayed, how does one do that for an
>Intuition window?  Do I need to obtain the ViewPort structure for my
>that I've changed the values?  Or, do I then do a MakeVPort(), MgrCop()
>and LoadView() ?  If so, where do I get the RasInfo structure for my
>window?  Would I have to do a RethinkDisplay() or RemakeDisplay() each
>time I wanted to change what I'm looking at?

     The RasInfo,ViewPort stuff is for scrolling the common bitmap of
     a screen. This is supported by the display hardware so smooth
     scrolling of ViewPorts is "easy". ScrollLayer, above, must shuffle
     bits in and out of your displayed window.
>
>Lastly, what are some of the uses of the Inutuition ViewAddress() and
>ViewPortAddress() routines ?

      You just described them above. To make use of the Screen/ViewPort
      features of the system while using Intuition.