How to Scroll?

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2 total messages Started by ARRA SHRAVAN KUMAR Wed, 08 Apr 1992 02:51

#216

Author: ARRA SHRAVAN KUMAR
Date: Wed, 08 Apr 1992 02:51

23 lines
1589 bytes

Dear Netters,

	My application draws a data structure like a tree or a linked list, in
a window. The size of the tree grows dynamically and is so big that it goes
beyond the screen. So I need to provide scrolling so that th euser can see all
parts of the tree. Obviously, I have to paint the uncovered portion of the 
window when the user scrolls. If I were dealing with text files I would read
from the text file the uncovered portion of the text  and paint it in the 
window. However I am dealing with bitmaps and other graphic objects. How do I do
this? My idea was to draw everything into a temporary drawing area(like a
memory DC) and display a part of it that corresponds to the window whenever a
WM_PAINT message comes. I tried to do this but failed. I heard from someone
that I cannot have a memory DC that is larger than the screen. Is this true?
This is like a paint application where your drawing area is much larger than 
the screen. How can I provide graphic scrolling when my drawing area is 
much larger (about 5 times) than the screen?

Please help me. It is very important for my thesis.

Thanks in advance.

Shravan
arra@a.cs.okstate.edu

Re: How to Scroll?

#304

Author: Jim Privat
Date: Fri, 10 Apr 1992 18:20

4 lines
536 bytes

> Please help me. It is very important for my thesis.

Your thesis?  Isn't that supposed to be straight from your *own*
brain?  Good luck.

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