RE: Re: How to scroll over An Image

that reminds me of something I was wondering about.. I have written a
comprehensive streaming engine in c++, but there I had the advantage of
explicitly allocating and freeing resources.. how would one get around
the fact that objects are only destroyed by the garbage collecter in
java? I know the resource should be released sometime after the last
reference to it is released, but is there a way to force that (I want to
try and implement a simple image-streaming algorithm..why? because I
CAN!!! ;p )
 

mattbenic
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-----Original Message-----
From: T [mailto:[email protected]]
Sent: Friday, November 14, 2003 2:50 AM
To: [email protected]
Subject: [m_game-dev] Re: How to scroll over An Image


Hi,
 
My limited experience is you define a floating rectangle the size of
your display viewport and move it over the top of an offscreen buffer
that contains your big image.  Each time you update your display you
blit the area of the big image that is underneath the floating rectangle
to the screen.  This gives the illusion of movement.  If your big image
is really big then you might get into trouble with having it loaded into
memory on low memory hardware.
 
A more complicated way to handle the problem is to break your big image
into smaller ones.  Then you load/unload small images from memory, only
having a few in memory at any one time (eg. 4).  The 4 you keep in
memory are the ones that coincide with the location of the floating
rectangle.  When your floating rectangles border crosses the borders of
your smaller images you will have to blit pieces of each small image to
the display viewport.  A little more work, but you could reduce your
memory footprint substantially.
 
Hope this helps.
 
 
Ty

"patil_java" < [email protected]
<mailto:[email protected]> > wrote in message
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<news:[email protected]> ...


Hi all,

I was just wondering how to scroll an backgroud Image so that we get an
feeling of we are moving.

And also I am not looking at just rolling over same segment like falling
stars etc where we put that in loop but actully what I am looking is
moving over an Big Image.

 

Thanxz

Chandu


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