[Solved] MUI or Intuition : How to scroll a BitMap in a Window ?

Hello,
I have again a question about BitMap, sorry...

I'm trying to show a Bitmap as full size in MUI and/or Intuition window.

If the Bitmap size is > window size, I don't know how to scroll to show the hidden parts of the bitmap.

In the following grab, I'm trying with MUI and with Intuition Window but I can't reproduce MultiView way to do.

http://zzd10h.amiga-ng.org/FastView/Bitmap_scroll.jpg

My Bitmap seems OK because when I resize my MUI window, I show the hidden part.

For MUI window, I create it with tags

MUIA_Window_Width,width,
MUIA_Window_Height,height,
MUIA_Window_CloseGadget,FALSE,
MUIA_Window_UseRightBorderScroller,TRUE,
MUIA_Window_UseBottomBorderScroller,TRUE,

For Intuition window,
WA_SizeGadget, TRUE,
WA_DragBar, TRUE,
WA_DepthGadget, TRUE,

Is a simple way to do that ?

Thank by advance, for your kind help...
(sorry again to ask to much questions.)

Guillaume

You need to work out the difference between window size and bitmap size, then update the sliders accordingly, and act on received messages from these offsetting your blitting with these values.

Thank you for your reply.
I hoped that I will be easier :(

Quote:

It is easier, with MUI at least. Use something like this:



This should work in principle. I did not test this code, but wrote it just from memory right now.

@zzd10h

See pictview.c here:
http://os4depot.net/index.php?functio ... rary/graphics/libpict.lha

@tboeckel :
Thank you.
I tried it with this code



It shows the scrollbar but they are not effective...

http://zzd10h.amiga-ng.org/FastView/FastView_ScrollMUI.jpg

@salass00
Thank for your sample, the hard way to do, I will try to understand it ;)

Quote:

Take the Virtual demo source as reference. The upper left virtual group does exactly what you want, except that it is showing a simple text instead of a bitmap.

Great, Thore it works now !

But only for DTpicObject, no for Bitmap.


left = BitmapObject
right = DTPicObject

http://zzd10h.amiga-ng.org/FastView/DTPic.jpg

As I want to display pictures as full size, DTPic will be nice but I have to subclass it to use a handle dispatcher (for keyboard input).

With Bitmap it works (but scrollbars are not working) with



But it failed for DTPic (display an empty Picture, compilation OK) with



Code working for DTpic (without subclass) is


Thore,
do you know

1) why the scrollers failed to operate with my Bitmap (it fails with or without mcc_class) ?

2) if it possible to create a NewObject DtpicObject like that ?

Thank you by advance.

Quote:

This cannot really work, because you are passing the result of a MUI_NewObject() call (inserted by the BitmapObject macro) as single tag without data to your own NewObject() call.

If your "mcc" variable is a subclass of Bitmap.mui, then the correct call must look like this:



The same applies to a subclass of Dtpic.mui. You can pass all attributes directly to the NewObject() call.

Please note that the OM_NEW method of your own class must pass all attributes it receives to the DoSuperMethod() call via TAG_MORE. For reference take a look at YAM's source of its Shutdown window. It is a very simple class which consists of a constructor only. The inittags() macro looks like this:



Quote:

This most probably fails because of the wrong object creation.

Quote:

No, see my explanation above.

Thank you Thore,
But even without use of subclassing, mcc, etc... ScrollBars appears but doesn't work with BitMapObject.



I will try this evening to correct NewObject calls

Quote:

Enforce a fixed sized bitmap object using MUIA_FixWidth,TRUE and MUIA_FixHeight,TRUE.

No luck for me, it's worst :)

With FixWidth and FixHeight it shows a very little windows with a little thing in center
The same result with or without mcc->mcc_class.

If I remove, BitmapObject at
NewObject(mcc->mcc_Class,NULL,BitmapObject,...) compilation failed.



I will try to make a short complete sample...

Ah, it works now.

It's was just

MUIA_FixWidth,width, MUIA_FixHeight,height,

and not with dimensions and not TRUE...

screenshot ;)

http://zzd10h.amiga-ng.org/FastView/FastView_Scroll_Bitmap_OK.jpg

Therefore, now scrollbars work with BitmapObject even with subclassing, wonderful !!!

Thank a lot Thore for all your help.
Guillaume

here is the code who works :

Quote:

Sorry, I wrote the stuff from memory and mixed up boolean values with real dimensions.

Quote:

My name is written with a simple "o", no french dressing on top of it ;)

Quote:

Now place the scrollbars in the window border, at least IIRC this was one of the wishes in the beginning. Add MUIA_Scrollgroup_UseWinBorder,TRUE to your Scrollgroup object and MUIA_Window_UseRightBorderScroller,TRUE and MUIA_Window_UseBottomBorderScroller,TRUE to your window object.

Yes, better !

Screenshot updated without name error ;)

http://zzd10h.amiga-ng.org/FastView/FastView_Scroll_Bitmap_OK.jpg

Great, solved.